50278 + Interview Questions in Physics Page 173 InterviewSolution

8601.	A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units. Find the spring force acting on the block at that instant?
Answer» A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units. Find the spring force acting on the block at that instant?

Discussion

8602.	a particle is moving along circular path of radius r.when it completes semi circular path ,then by what angle its angular velocity changes?
Answer» a particle is moving along circular path of radius r.when it completes semi circular path ,then by what angle its angular velocity changes?

Discussion

8603.	A cube is compressed at 0∘ C equally from all sides by an external pressure p. By what amount should the temperature be raised to bring it back to the size it had before the external pressure was applied? (Given K is bulk modulus of elasticity of the material of the cube and α is the coefficient of linear expansion)
Answer» A cube is compressed at $0^{\circ} C$ equally from all sides by an external pressure p. By what amount should the temperature be raised to bring it back to the size it had before the external pressure was applied? (Given K is bulk modulus of elasticity of the material of the cube and $α$ is the coefficient of linear expansion)

Discussion

8604.	A small circular ring has a uniform charge distribution. On a far-off axial point at a distance x from the centre of the ring, the electric field is proportional to -
Answer» A small circular ring has a uniform charge distribution. On a far-off axial point at a distance $x$ from the centre of the ring, the electric field is proportional to -

Discussion

8605.	At what temperature will the speed of sound in hydrogen be the same as in oxygen at 1000 C? Molar masses of oxygen and hydrogen are in the ratio 16:1.
Answer» At what temperature will the speed of sound in hydrogen be the same as in oxygen at $100^{0}$ C? Molar masses of oxygen and hydrogen are in the ratio 16:1.

Discussion

8606.	A disc of mass m and radius R is placed over a plank of same mass m. There is sufficient friction between disc and plank to prevent slipping. A force F is applied at the centre of the disc. Which option(s) is/are correct.[a= acceleration of disc and f= force of friction]
Answer» A disc of mass $m$ and radius $R$ is placed over a plank of same mass $m$ . There is sufficient friction between disc and plank to prevent slipping. A force $F$ is applied at the centre of the disc. Which option(s) is/are correct. [ $a =$ acceleration of disc and $f =$ force of friction]

Discussion

8607.	ntAprojectile is thrown at an angle (theta) and (90-theta) from the same point with same velocity 98 m/s .The heights attained by them if the difference of heights is 50 m will be (m)n
Answer» ntAprojectile is thrown at an angle (theta) and (90-theta) from the same point with same velocity 98 m/s .The heights attained by them if the difference of heights is 50 m will be (m)n

Discussion

8608.	For p>0, a vector →V2=2^i+(p+1)^j is obtained by rotating the vector →V1=√3p^i+^j by an angle θ about origin in counter clockwise direction. If tanθ=(α√3−2)(4√3+3), then the value of α is equal to
Answer» For $p > 0,$ a vector $_{2} = 2^i + (p + 1)^j$ is obtained by rotating the vector $_{1} = \sqrt{3} p^i +^j$ by an angle $θ$ about origin in counter clockwise direction. If $tan θ = \frac{(α \sqrt{3} - 2)}{(4 \sqrt{3} + 3)},$ then the value of $α$ is equal to

Discussion

8609.	Two vehicles blow horns at 3203Hz. They are moving directly towards each other. A is moving at 10m/s and B is moving such that he hears a beat frequency of 5Hz at t = 0. If they are 90m apart at t = 0, at the time (in sec) vehicles at which they cross each other is (Take speed of sound = 330 m/s) ___
Answer» Two vehicles blow horns at $\frac{320}{3}$ Hz. They are moving directly towards each other. A is moving at 10m/s and B is moving such that he hears a beat frequency of 5Hz at t = 0. If they are 90m apart at t = 0, at the time (in sec) vehicles at which they cross each other is (Take speed of sound = 330 m/s) ___

Discussion

8610.	an electric dipole when held at 30 degree with respect to the uniform electric field of 510raise to 2 N\C experiences a torque of 2 10 raise to -12 Nm the dipole moment of the dipole is
Answer» an electric dipole when held at 30 degree with respect to the uniform electric field of 510raise to 2 N\C experiences a torque of 2 10 raise to -12 Nm the dipole moment of the dipole is

Discussion

8611.	∫(2x2−3sinx+5√x)dx is equal to (where C is the constant of integration)
Answer» $\int (2 x^{2} - 3 sin x + 5 \sqrt{x}) d x$ is equal to (where $C$ is the constant of integration)

Discussion

8612.	Calculate the power of an electric pump that can lift 600 kg of water from the ground into a tank placed at a height of 1200 cm in 10 seconds. (Take g=10 m/s2)
Answer» Calculate the power of an electric pump that can lift $600 kg$ of water from the ground into a tank placed at a height of $1200 cm$ in $10$ seconds. (Take $g = 10 {m/s}^{2}$ )

Discussion

8613.	For a liquid, the normal boiling point is −173∘C, then at 2atm pressure its boiling point should be nearly (ΔHvap=200calmole,R=2cal mol−1K−1,In2=0.7)
Answer» For a liquid, the normal boiling point is $- 173^{\circ} C$ , then at 2atm pressure its boiling point should be nearly $(Δ H_{v a p} = \frac{200 c a l}{m o l e}, R = 2 c a l m o l^{- 1} K^{- 1}, I n 2 = 0.7)$

Discussion

8614.	46.Difference between angular velocity and angular frequency in oscillations?
Answer» 46.Difference between angular velocity and angular frequency in oscillations?

Discussion

8615.	Consider a dipole with dipole moment 4.8×10^-30cm . Let a point P lies 4.1×10^-9m away from the centre of dipole. What is the value of potential at :(I) point is along axis of dipole nearer to positive charge (II) point is 45° above the axis but nearer to positive charge (III) point is 45° above the axis but nearer to negative charge
Answer» Consider a dipole with dipole moment 4.8×10^-30cm . Let a point P lies 4.1×10^-9m away from the centre of dipole. What is the value of potential at : (I) point is along axis of dipole nearer to positive charge (II) point is 45° above the axis but nearer to positive charge (III) point is 45° above the axis but nearer to negative charge

Discussion

8616.	The electric potential (V) in volts varies with x (in meters) according to the relation V=5+4x2. The force experienced by a negative charge of 2 μC located at x=0.5 m is
Answer» The electric potential $(V)$ in $volts$ varies with $x$ $(in meters)$ according to the relation $V = 5 + 4 x^{2}$ . The force experienced by a negative charge of $2 μ C$ located at $x = 0.5 m$ is

Discussion

8617.	45. A person 1.6m tall is standing at the centre between two walls 3 m high. what is the minimum size of a plane mirror fixed on the wall in front of him ,if he is to see the full height of the wall behind him?
Answer» 45. A person 1.6m tall is standing at the centre between two walls 3 m high. what is the minimum size of a plane mirror fixed on the wall in front of him ,if he is to see the full height of the wall behind him?

Discussion

8618.	A thin biconvex converging lens of refractive index 1.5 has power of +5 D. When this lens is immersed in a liquid, it acts as a diverging lens of focal length 100 cm. The refractive index of the liquid is
Answer» A thin biconvex converging lens of refractive index $1.5$ has power of $+ 5 D$ . When this lens is immersed in a liquid, it acts as a diverging lens of focal length $100 cm$ . The refractive index of the liquid is

Discussion

8619.	Explain why (a) The blood pressure in humans is greater at the feet than at the brain (b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km (c) Hydrostatic pressure is a scalar quantity even though pressure is force divided by area.
Answer» Explain why (a) The blood pressure in humans is greater at the feet than at the brain (b) Atmospheric pressure at a height of about 6 km decreases to nearly half of its value at the sea level, though the height of the atmosphere is more than 100 km (c) Hydrostatic pressure is a scalar quantity even though pressure is force divided by area.

Discussion

8620.	Question 21Using following data, draw time - displacement graph for a moving object:Use this graph to find average velocity for first 4 s, for next 4 s and for last 6 s.
Answer» Question 21 Using following data, draw time - displacement graph for a moving object: Use this graph to find average velocity for first 4 s, for next 4 s and for last 6 s.

Discussion

8621.	A force is applied on a body of mass 20 kg moving with a velocity of 40 m/s. The body attains a velocity of 50 m/s in 2 seconds. Calculate the work done on the body.
Answer» A force is applied on a body of mass $20 kg$ moving with a velocity of $40 m/s$ . The body attains a velocity of $50 m/s$ in $2 seconds$ . Calculate the work done on the body.

Discussion

8622.	A boy throws a ball with an initial velocity and at an angle of elevation such that the range is r and maximum height to which ball rises is h. Find the maximum range that can be obtained with same initial velocity.
Answer» A boy throws a ball with an initial velocity and at an angle of elevation such that the range is $r$ and maximum height to which ball rises is $h$ . Find the maximum range that can be obtained with same initial velocity.

Discussion

8623.	A man in a balloon rising vertically with an acceleration of 4.9m/s2 releases a ball 2 second after the balloon is let go from the ground. The greatest height above the ground reached by the ball is(g=9.8)
Answer» A man in a balloon rising vertically with an acceleration of 4.9m/s² releases a ball 2 second after the balloon is let go from the ground. The greatest height above the ground reached by the ball is(g=9.8)

Discussion

8624.	If force 20 N acts with angle 30^° on an inclined plane, then normal force on it is ?(coefficient of friction given is o.2)
Answer» If force 20 N acts with angle 30^° on an inclined plane, then normal force on it is ?(coefficient of friction given is o.2)

Discussion

8625.	Consider the capacitor circuit shown in the figure initially only K1 is closed and after sufficiently long time, K2 is also closed. The charge flowing through section 1→2 after closing the K2 is
Answer» Consider the capacitor circuit shown in the figure initially only $K_{1}$ is closed and after sufficiently long time, $K_{2}$ is also closed. The charge flowing through section $1 \to 2$ after closing the $K_{2}$ is

8625.

Consider the capacitor circuit shown in the figure initially only K1 is closed and after sufficiently long time, K2 is also closed. The charge flowing through section 1→2 after closing the K2 is

Answer»

Consider the capacitor circuit shown in the figure initially only $K_{1}$ is closed and after sufficiently long time, $K_{2}$ is also closed. The charge flowing through section $1 \to 2$ after closing the $K_{2}$ is

Discussion

8626.	Two insulating plates, both uniformly charged in such a way that the potential difference between them is V2−V1=20 V. The plates are separated by d=0.1 m and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits the plate 2?[e=1.6×10−19 C and me=9×10−31 kg]
Answer» Two insulating plates, both uniformly charged in such a way that the potential difference between them is $V_{2} - V_{1} = 20 V$ . The plates are separated by $d = 0.1 m$ and can be treated as infinitely large. An electron is released from rest on the inner surface of plate $1$ . What is its speed when it hits the plate $2$ ? $[e = 1.6 \times 10^{- 19} C$ and $m_{e} = 9 \times 10^{- 31} kg]$

Discussion

8627.	Body is projected horizontally with a speed v0. Find the velocity of the body when it covers equal distances in horizontal and vertical directions.
Answer» Body is projected horizontally with a speed v0. Find the velocity of the body when it covers equal distances in horizontal and vertical directions.

Discussion

8628.	For the given uniformly charged ring sector, the net electric field at the point P is(Take 2019 rad=60∘)
Answer» For the given uniformly charged ring sector, the net electric field at the point $P$ is (Take $\frac{20}{19} rad = 60^{\circ}$ )

Discussion

8629.	Show 5x+6y greater equal 30 xx greater equal 0y greater equal 0
Answer» Show 5x+6y greater equal 30 x x greater equal 0 y greater equal 0

Discussion

8630.	{ A semiconductor has equal electron and hole concentrations of }2×10^8m^{-3} On doping with a certain impurity, }}{ the hole concentration increases to }4×10^{10}m^{-3} . }} (1) What type of semiconductor is obtained on doping? } (ii) Calculate the new electron concentration of the semiconductor. } (iii) How does the energy gap vary with doping?
Answer» { A semiconductor has equal electron and hole concentrations of }2×10^8m^{-3} On doping with a certain impurity, }}{ the hole concentration increases to }4×10^{10}m^{-3} . }} (1) What type of semiconductor is obtained on doping? } (ii) Calculate the new electron concentration of the semiconductor. } (iii) How does the energy gap vary with doping?

Discussion

8631.	A mass of 100 gram is attached to the end of a rubber string 49 cm long having an area of cross-section 20 mm2. The string is whirled around horizontally at a constant speed of 40 rps in a circle of radius 51 cm. Find the ratio of longitudinal stress and longitudinal strain in the rubber string.
Answer» A mass of $100 gram$ is attached to the end of a rubber string $49 cm$ long having an area of cross-section $20 {mm}^{2}$ . The string is whirled around horizontally at a constant speed of $40 rps$ in a circle of radius $51 cm$ . Find the ratio of longitudinal stress and longitudinal strain in the rubber string.

Discussion

8632.	nta gas is heated through 1C in a closed vessel . its pressure is increased by 0.4% then initial temp of gas isn
Answer» nta gas is heated through 1C in a closed vessel . its pressure is increased by 0.4% then initial temp of gas isn

Discussion

8633.	What is the difference between free vector and null vector?
Answer» What is the difference between free vector and null vector?

Discussion

8634.	does wavelenght increase or decrease with increase or decrease in velocity?
Answer» does wavelenght increase or decrease with increase or decrease in velocity?

Discussion

8635.	A point object is kept near a plane mirror. The mirror starts moving away from the object with a speed of 4cm/s. The velocity of the image is
Answer» A point object is kept near a plane mirror. The mirror starts moving away from the object with a speed of $4 c m / s$ . The velocity of the image is

Discussion

8636.	A small ball of mass m is connected by an inextensible massless string of length l with another ball of mass M=4m. They are released with zero tension in the string from a height h as shown in the figure. The time t after which the string becomes taut for the first time after the mass m collides with the ground is (Assume all the collisions to be elastic)
Answer» A small ball of mass $m$ is connected by an inextensible massless string of length $l$ with another ball of mass $M = 4 m$ . They are released with zero tension in the string from a height $h$ as shown in the figure. The time $t$ after which the string becomes taut for the first time after the mass $m$ collides with the ground is (Assume all the collisions to be elastic)

Discussion

8637.	What is the refractive index of the material of a plano-convex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm?
Answer» What is the refractive index of the material of a plano-convex lens, if the radius of curvature of the convex surface is $10 c m$ and focal length of the lens is $30 c m$ ?

Discussion

8638.	A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field at point O will be close to:
Answer» A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of $10 A$ . The magnetic field at point $O$ will be close to:

Discussion

8639.	A sonometer wire of length L, has fundamental frequency ν. If it is plucked at L/8 from the fixed end, then the frequency of the wire is (1) ν (2) 2ν (3) 3ν (4) 4ν
Answer» A sonometer wire of length L, has fundamental frequency ν. If it is plucked at L/8 from the fixed end, then the frequency of the wire is (1) ν (2) 2ν (3) 3ν (4) 4ν

Discussion

8640.	It has been said in the video lectures that the net upward force in a capillary tube dipped in a container full of water is T cos twhere theta is an acute angle and for an acute angle T cos theta is greater than T, but if in case the angle of contact is 60 degrees, the upward force becomes less than T as cos 60 is equal to 1/2. Please explain.
Answer» It has been said in the video lectures that the net upward force in a capillary tube dipped in a container full of water is T cos twhere theta is an acute angle and for an acute angle T cos theta is greater than T, but if in case the angle of contact is 60 degrees, the upward force becomes less than T as cos 60 is equal to 1/2. Please explain.

Discussion

8641.	A long metallic bar is carrying heat from one of its ends to the other end under steady state. The variation of temperature θ along the length X of the bar from its hot end is best described by which of the following figures?
Answer» A long metallic bar is carrying heat from one of its ends to the other end under steady state. The variation of temperature $θ$ along the length $X$ of the bar from its hot end is best described by which of the following figures?

Discussion

8642.	In an refrigerator, compressor motor is of 1 kW power. Heat is transferred from –3∘C to 27∘C. What amount of heat is coming out of the refrigerator per second assuming that efficiency of refrigerator is 50% of a perfect engine?
Answer» In an refrigerator, compressor motor is of $1 kW$ power. Heat is transferred from $- 3^{\circ} C$ to $27^{\circ} C$ . What amount of heat is coming out of the refrigerator per second assuming that efficiency of refrigerator is $50 %$ of a perfect engine?

Discussion

8643.	One end of an ideal spring having spring constant100 N/m is converted to a block of mass 4 kg. Theother end of the spring is fixed. The block lies ona smooth horizontal surface. If the block is pushedso that the spring is compressed by 10 cm andreleased from rest: The speed of the block whenspring regains its original length is
Answer» One end of an ideal spring having spring constant100 N/m is converted to a block of mass 4 kg. Theother end of the spring is fixed. The block lies ona smooth horizontal surface. If the block is pushedso that the spring is compressed by 10 cm andreleased from rest: The speed of the block whenspring regains its original length is

Discussion

8644.	A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by ΔT in a time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but the length 2L. The temperature of the wire is raised by the same amount ΔT in the same t. The value of N is
Answer» A wire of length $L$ and $3$ identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by $Δ T$ in a time $t$ . A number $N$ of similar cells is now connected in series with a wire of the same material and cross-section but the length $2 L$ . The temperature of the wire is raised by the same amount $Δ T$ in the same $t$ . The value of $N$ is

Discussion

8645.	A body moving with a speed of 36 km/his brought to rest in 10 s. What is the negative acceleration and the distance travelled by the body before coming to rest?
Answer» A body moving with a speed of 36 km/his brought to rest in 10 s. What is the negative acceleration and the distance travelled by the body before coming to rest?

Discussion

8646.	(a) Calculate the value of V0 and I if the Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit.(b) If the Ge diode connection be reversed. What will be the new values of V0 and I?
Answer» (a) Calculate the value of $V_{0}$ and $I$ if the $S i$ diode and the $G e$ diode start conducting at $0.7 V$ and $0.3 V$ respectively, in the given circuit. (b) If the $G e$ diode connection be reversed. What will be the new values of $V_{0}$ and $I ?$

Discussion

8647.	The plate on the back of a personal computer says that it draws 2.7 A from a 120-V, 60-Hz line. For this computer, what is (a) the average of the square of the current, (b) the current amplitude, (c ) the average current for a positive half cycle, and (d ) the average current for a full cycle
Answer» The plate on the back of a personal computer says that it draws 2.7 A from a 120-V, 60-Hz line. For this computer, what is (a) the average of the square of the current, (b) the current amplitude, (c ) the average current for a positive half cycle, and (d ) the average current for a full cycle

Discussion

8648.	Find the current through the resistance R in the figure if A) R=12ohm B) R=48ohm
Answer» Find the current through the resistance R in the figure if A) R=12ohm B) R=48ohm

Discussion

8649.	how fast is an electron moving if it has a wavelength equal to the distance it travel in one second
Answer» how fast is an electron moving if it has a wavelength equal to the distance it travel in one second

Discussion

8650.	A rocket is launched vertically from the surface of the earth of radius R with an initial speed v. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by
Answer» A rocket is launched vertically from the surface of the earth of radius R with an initial speed v. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by

Discussion

Explore topic-wise InterviewSolutions in .

A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units. Find the spring force acting on the block at that instant?

a particle is moving along circular path of radius r.when it completes semi circular path ,then by what angle its angular velocity changes?

A small circular ring has a uniform charge distribution. On a far-off axial point at a distance x from the centre of the ring, the electric field is proportional to -

At what temperature will the speed of sound in hydrogen be the same as in oxygen at 1000 C? Molar masses of oxygen and hydrogen are in the ratio 16:1.

A disc of mass m and radius R is placed over a plank of same mass m. There is sufficient friction between disc and plank to prevent slipping. A force F is applied at the centre of the disc. Which option(s) is/are correct.[a= acceleration of disc and f= force of friction]

ntAprojectile is thrown at an angle (theta) and (90-theta) from the same point with same velocity 98 m/s .The heights attained by them if the difference of heights is 50 m will be (m)n

For p&gt;0, a vector →V2=2^i+(p+1)^j is obtained by rotating the vector →V1=√3p^i+^j by an angle θ about origin in counter clockwise direction. If tanθ=(α√3−2)(4√3+3), then the value of α is equal to

an electric dipole when held at 30 degree with respect to the uniform electric field of 5*10raise to 2 N\C experiences a torque of 2* 10 raise to -12 Nm the dipole moment of the dipole is

∫(2x2−3sinx+5√x)dx is equal to (where C is the constant of integration)

Calculate the power of an electric pump that can lift 600 kg of water from the ground into a tank placed at a height of 1200 cm in 10 seconds. (Take g=10 m/s2)

For a liquid, the normal boiling point is −173∘C, then at 2atm pressure its boiling point should be nearly (ΔHvap=200calmole,R=2cal mol−1K−1,In2=0.7)

46.Difference between angular velocity and angular frequency in oscillations?

The electric potential (V) in volts varies with x (in meters) according to the relation V=5+4x2. The force experienced by a negative charge of 2 μC located at x=0.5 m is

45. A person 1.6m tall is standing at the centre between two walls 3 m high. what is the minimum size of a plane mirror fixed on the wall in front of him ,if he is to see the full height of the wall behind him?

A thin biconvex converging lens of refractive index 1.5 has power of +5 D. When this lens is immersed in a liquid, it acts as a diverging lens of focal length 100 cm. The refractive index of the liquid is

Question 21Using following data, draw time - displacement graph for a moving object:Use this graph to find average velocity for first 4 s, for next 4 s and for last 6 s.

A force is applied on a body of mass 20 kg moving with a velocity of 40 m/s. The body attains a velocity of 50 m/s in 2 seconds. Calculate the work done on the body.

A boy throws a ball with an initial velocity and at an angle of elevation such that the range is r and maximum height to which ball rises is h. Find the maximum range that can be obtained with same initial velocity.

A man in a balloon rising vertically with an acceleration of 4.9m/s​​​​​​2 releases a ball 2 second after the balloon is let go from the ground. The greatest height above the ground reached by the ball is(g=9.8)

If force 20 N acts with angle 30^° on an inclined plane, then normal force on it is ?(coefficient of friction given is o.2)

Consider the capacitor circuit shown in the figure initially only K1 is closed and after sufficiently long time, K2 is also closed. The charge flowing through section 1→2 after closing the K2 is

Body is projected horizontally with a speed v0. Find the velocity of the body when it covers equal distances in horizontal and vertical directions.

For the given uniformly charged ring sector, the net electric field at the point P is(Take 2019 rad=60∘)

Show 5x+6y greater equal 30 xx greater equal 0y greater equal 0

A mass of 100 gram is attached to the end of a rubber string 49 cm long having an area of cross-section 20 mm2. The string is whirled around horizontally at a constant speed of 40 rps in a circle of radius 51 cm. Find the ratio of longitudinal stress and longitudinal strain in the rubber string.

nta gas is heated through 1C in a closed vessel . its pressure is increased by 0.4% then initial temp of gas isn

What is the difference between free vector and null vector?

does wavelenght increase or decrease with increase or decrease in velocity?

A point object is kept near a plane mirror. The mirror starts moving away from the object with a speed of 4cm/s. The velocity of the image is

What is the refractive index of the material of a plano-convex lens, if the radius of curvature of the convex surface is 10 cm and focal length of the lens is 30 cm?

A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A. The magnetic field at point O will be close to:

A sonometer wire of length L, has fundamental frequency ν. If it is plucked at L/8 from the fixed end, then the frequency of the wire is (1) ν (2) 2ν (3) 3ν (4) 4ν

A long metallic bar is carrying heat from one of its ends to the other end under steady state. The variation of temperature θ along the length X of the bar from its hot end is best described by which of the following figures?

In an refrigerator, compressor motor is of 1 kW power. Heat is transferred from –3∘C to 27∘C. What amount of heat is coming out of the refrigerator per second assuming that efficiency of refrigerator is 50% of a perfect engine?

A body moving with a speed of 36 km/his brought to rest in 10 s. What is the negative acceleration and the distance travelled by the body before coming to rest?

(a) Calculate the value of V0 ​ and I if the Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit.(b) If the Ge diode connection be reversed. What will be the new values of V0 ​ and I?

The plate on the back of a personal computer says that it draws 2.7 A from a 120-V, 60-Hz line. For this computer, what is (a) the average of the square of the current, (b) the current amplitude, (c ) the average current for a positive half cycle, and (d ) the average current for a full cycle

Find the current through the resistance R in the figure if A) R=12ohm B) R=48ohm

how fast is an electron moving if it has a wavelength equal to the distance it travel in one second

A rocket is launched vertically from the surface of the earth of radius R with an initial speed v. If atmospheric resistance is neglected, the maximum height attained by the rocket is given by

For p>0, a vector →V2=2^i+(p+1)^j is obtained by rotating the vector →V1=√3p^i+^j by an angle θ about origin in counter clockwise direction. If tanθ=(α√3−2)(4√3+3), then the value of α is equal to

an electric dipole when held at 30 degree with respect to the uniform electric field of 510raise to 2 N\C experiences a torque of 2 10 raise to -12 Nm the dipole moment of the dipole is

A man in a balloon rising vertically with an acceleration of 4.9m/s2 releases a ball 2 second after the balloon is let go from the ground. The greatest height above the ground reached by the ball is(g=9.8)

(a) Calculate the value of V0 and I if the Si diode and the Ge diode start conducting at 0.7 V and 0.3 V respectively, in the given circuit.(b) If the Ge diode connection be reversed. What will be the new values of V0 and I?