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A gun fires 10 bullets/sec each of mass 10 gm, with a muzzle velocity of 50 m/s. Find the force required to hold the gun in position.

The speed of sound in hydrogen at 00C is 1280 ms−1. The desiny of hydrogen at STP is 0.089 kg m−3. Calculate the molar heat capacities Cp and Cv of hydrogen.

71.The angular frequency of oscillation is 20rad of particle of mass 0.1 kg which executes shm along x axis. The kinetic energy is 0.2j and potential energy is 0.3j at x=0.02m.the potential energy is zero at mean position. Amplitude of oscillation is

The average translational kinetic energy of air molecules is 0.040 eV (1 eV = 1.6 ×10−19 J). Calculate the temperature of the air. Boltzmann constant k = 1.38 ×10−23J K−1

A wire of resistance 5 ohm is drawn out so that its new length is three times its original length. What is the resistance of the new wire ?

If mass M is tied to spring of mass Ms find its maximum extention time period and amplitude.

ntformula of wave velocityn ntn

Computethe magnitude of the following vectors:

What force is required to stretch a steel wire 1 cm2 in cross section to double its length? (Youngs modulus for steel is 2×1011Pa)

Plastic straws A and B are rubbed with dry cotton cloth. What will happen, if they are brought near each other?

142 Light from a sodium lamp, lambda = 600 nm, is diffracted by a slit of width d = 0.60 mm. The distance from the slit to the screen is D = 0.6. m. Then, the width of the central maximum is a. 2.4mm b. 1.2mm c. 0.6mm d. 4.8 mm

one end of uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight W1 is suspended from its lower end.if s is the area of cross-section of the wire, the stress in the wire at a height (L/4) from its lower end is

A ray incident at an angle 53∘ on a prism and emerges at an angle of 37∘ as shown in figure. If the angle of incidence is made 50∘ then possible value of the angle of emergence is

The frequency of spring mass system is 16 Hz .if the spring is cut into two halves and one half oscillates with same mass , the frequency of oscillation will be

A wire, bent in the form of a right-angled triangle ABC carries a current of 1 A. It is placed in the region of a uniform magnetic field B=0.2 T as shown in the figure. If AC=1 m, the net force on the wire is -

A stone falls from a balloon that is descending at a uniform rate of 12 m/s. The displacement of the stone from the point of release after 10 sec is

An inextensible string in the form of a loop is placed on a horizontal film of soap solution of surface tension T if film is pierced inside the loop and it convert into a circular loop of diameter D then the tension produced in string is

An electron having charge e and mass m at rest starts from the lower plate of two metallic plates separated by a distance d. If the potential difference between the plates is V, the time taken by the electron to reach the upper plate is

a particle of mass m moves with cons†an t speed v on a circular path of radius r. find magnitude of average force on it in half revolution. explain it briefl

Two masses are in the ratio 1:5. What is ratio of their inertia?

89.A body is projected vertically up. At certain hight h above the ground, its PE and KE are in ratio 1:4 . At what height above the ground , PE and KE will be in the ratio 4:1

Thermodynamic process is shown below on a P−V diagram for one mole of an ideal gas . If V2 = 2V1 , then the ratio of temperature T2T1 is :

a gas is filled in a container of volume V at cons†an t pressure and at 27 degree celsius temperature . find out the amount of gas that will escape out of the container if temperature rises to 37 degree celsius ?

For a projectile thrown up an incline plane (making an angle θ with horizontal), maximum range on then he achieved by projecting at an anglefrom the horizontal (0 is acute).range on the ground can be achiee

What is the average powered delived to a pot of mass m, in lifting it to a height 'h' in a time t?

A ball covers 12 m in its last one fourth second of its fall calculate the height from which the ball was thrown

Current is a pseudovector or not

41. A proton, a deuteron and an alpha particle having equal kinetic energy are moving in circular path of radius rp, rd and ra resp.in a uniform magnetic field, then 1) rd>rp ; ra=rd 2) rp>ra ; ra=rd 3) rd>rp ; ra=rp 4) ra>rd>rp.

Calculate the inductance of a solenoid containing 200 turns, a length of 25 cm and an area of cross section of 8 cm2.

Ultrasonic waves of frequency 4.5 MHz are used to detect tumor in soft tissues. The speed of sound in tissue is 1.5 km s−1 and that in air is 340 m s−1. Find the wavelength of this ultrasonic wave in tissue.

An electric current of 12 ampere flows through a conductor in 15 seconds. Find the amount of charge that flows through the conductor.

A particle of mass m is moving in a horizontal circle of radius r with a centripetal force F=−kr2^r, where k = 1 unit. The total energy of the particle is

A stone of mass m tied to a string of length L is whirled in a vertical circle . If the string remain just stretched when the stone is at the top of the circle the tension in the sring when the stone is at the bottm of the circle is: A)3 mg B)6mg C)mg D)2 mg

Pressure is defined as force per unit area of the surface .The S.I unit of pressure is pascal 1 pascal = 1N/m2 if mass of air at sea level is1034g/cm2 calculate the pressure in pascal

A charge Q is placed at the centre of a cube. Find the flux of the electric field through three surfaces of the cube.

In the following circuit if VA−VB=4 V, then the value of resistance X in ohms will be:

A swimmer a want to reach directly at point b on the other Bank of the river swims with minimum possible speed with respect to river and reaches directly at point big the width of water is w and river flow with velocity v,then time which swimmer crosses the river is

A heater coil boils certain amount of water in 10minute.Another heater coil boils the same amount of water in 15minute.If both heaters are used in series to boil the same amount of water, then time taken will be

In the given graph what is the slope at x=2?

The acceleration of a body starting from rest is given by a=13−0.1s, where a is the acceleration (in m/s2) and s is the displacement (in m). If its mass is 2 kg, find its momentum when the displacement is 100 m.

The heat loss from a fin is 6 W. The effectiveness and efficiency of the fin are 3 and 0.75 respectively. The heat loss (in W) from the fin. Keeping the entire fin surface at base temperature is

A galvanometer coil has a resistance of 15 W and the metre showsfull scale deflection for a current of 4 mA. How will you convert themetre into an ammeter of range 0 to 6 A?

There is a uniformly charged non conducting solid sphere of k=1.is V at infinity be zero then potential at it surface is V. If we take V at its surface 0 than potential at centre will be

a particle is thrown at an angle with horizontal follows trajectory a pr equation y=ax-bx^2 . Find the time of flight.