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d is the correct answer

D)8A is the correct answer

Theformulaforuniform motionis d = rt, meaning distance is equal to rate times time. d, or distance, refers to the actual length/distance ofmotion. ... r, or rate, refers to the speed and will always contain a ratio between distance and time (as in miles per hour

Electric motor: A motor is a device which converts electrical energy into mechanical energy.Principle of motor : A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it. A force acts on the coil which rotates it continuously.When electric current is passed into the rectangular coil, this current produces a magnetic field around the coil.

The magnetic field of horse shoe-type magnet then interacts with the magnetic field of the coil and causes the coil to rotate continuously.

If ABCD is in horizontal position current from battery enters the coil through brush $, and commutator half ring C:. The current flows in the direction ABCDand leaves via ring and brush $B _{ 2 }

The direction of current is from A to B, the direction of current is from C to D. The force on side AB of the coil is in the downward direction. Whereas the force on the side CD of the coil is in the upward direction. ABCD rotate in anti-clockwise direction.

While rotating when the coil reaches vertical position then the brushes _{ 1 } and B _{ 2 }will touch the gap between the commutator rings and current to the coil is cut off. But the coil does not stop rotating because it has already gained momentum.

The coil CD comes on the left side and AB comes to the right side. Again they come in contact with brush $B _{ 1 } Current direction is reversed.

The reversing of current in the coil is repeated after every half rotation due to which the coil continue to rotate as long as current from the batter is passed through it. The rotating shaft of electric motor can drive a large number of machines which are connected to it

The acceleration of the system is = net force/total mass = (3*10-2*10)/(3+2) = 10/2 = 5m/s²

now, in 2sec the displacement is s = 1/2*(a)*t² = 1/2*(2)*(4) = 2m

workdone = net force × displacement= 10*2 = 20J

why it is 3g-2g plz answering my questions

because on making the rope straight , you will find that 3g and 2g are acting in opposite direction.

2g<---------------->3g

okay

indeterminate due to inadequate data of 8A

B) is the correct answer

Usingv = u + at0 = 35 + a*tat = - 35a = - 35/t........ (1)

Now,Usings = ut + 1/2 at^2Put value of a from eq(1)2.8 = 35t + 1/2 * (-35/t) * t^22.8 = 35t - 35/2 t2.8 * 2 = 35 tt = 2.8 * 2/35 =.8/5t = 16/100 = .16 sec

(a) is correct option

The kinetic energy of the ball consists of translational and rotational kinetic energy. Using conservation of energy we can solve for the speed of the ball. Therefore, mgh1 = mgh3+(1/2)m(VG)2+(1/2)IGw2, where m is the mass of the ball, VG is the velocity of the center of mass of the ball, w is the angular velocity of the ball, and IG is the rotational inertia of the ball about its center of mass. For no slipping w = (VG)/R, where R is the radius of the ball. And IG = (2/5)mR2. Combining these three equations we can solve for VG.

Answer: VG = [(10g/7)(h1−h3)]1/2

here is a similar question.

Refractive index of glass slab = (real thickness/ (apparent thickness )= 1.5

Real thickness = 10 cm

Therefore, apparent thickness = 10/1.5 = 20.0/3 = 6.66 cm

Therefore, the dot appears raised by = 10 cm - 6.66 cm = 3.34 cm height.

Snell’s Law for surface AB: n1 sin60 = n2 sinr1

For air n1 = 1 and n2 = n for a prism as per the question. So as per Snell’s law this equation becomes:

=> √3/2 = n sin r1

=> Sin r1 = √3/2n ——— eq 1

Similarly applying it to surface AC gives

=> n sin r2 = sin θ ——— eq 2

As seen in equilateral triangle ABC , we have

A+B+C = 180⁰ and also A = B = C = 60⁰ [ABC is an equilateral triangle]

Now we have r1 + B = 90⁰ and also r2 + C = 90⁰ so substituting it gives:

60⁰ + 90⁰-r1 + 90-r2 = 180⁰r1+r2 = 60⁰So now lets use simple trigonometry to play with above equation along with eq 1 & 2 to remove the r1 and r2. As per equation 2, we have

n sin r2 = sin θn sin(60-r1) = sin θn [sin 60 cos r1 – cos60 sin r1] = sin θn [√3/2 cos r1 – ½ sin r1] = sin θn [ √3/2 √(1-sin² r1) – ½ √3/2n] = sin θ [substituting equation 1]n [ √3/2 √(1-3/4n) – ½ √3/2n] = sin θn [√3/4 {√(4n²-3) -1} ] = sin θ —————–eq 3 answer to the real question – For n = √3 the value of θis 60 deg and dθ/dn = m . The value of m is?

taking a derivative dθ/dn of equation 3 and substitute the given values i.e. n = √3 & θ= 60. Let’s do that below, applying the operator “d/dn” on both sides:

d/dn [√3/4 {√(4n²-3) -1} ] = d/dn sinθ =(d/dθ sinθ) dθ/dn = cosθ dθ/dndθ/dn = 1/cos θ x d/dn [√3/4 {√(4n²-3) -1} ]After taking a derivative and putting n = √3 & θ= 60 gives

dθ/dn = 2

thnkuuu so much

FoodProducts, whichwe get from Animals

Milk: Cows are our chief source of milk, though buffaloes, goats, sheep, yaks and camels also give us milk. ...

Eggs: Poultry is the term used for birds raised for the production of eggs and meat. ...

Meat: You mayhaveheard the terms red meat and white meat.

D) is the correct answer

D) 8 A is the correct answer

Torque on a body in circular motion is zero, if it is moving along the circular path with uniform speed, hence it will have a radial acceleration.

Resulting in a radial force, hence the Torque, which is the cross product of Radial vector and Force will be zero.

But if the speed of the body is varying, that means it also has an tangential acceleration in addition to the radial acceleration.

And in this case the net force is not in along the radius, hence Torque will have a non-zero value.

Natural Satellites

1.The natural Satellites are celestial bodies that orbit a Planet or any other Celestial body.2.These are formed by nature.3.The most well known Natural Satellite is the Earth's Moon.4.The natural satellites are objects that orbit the earth such as the moon.5.The natural satellites like Planets are opaque bodies with no light of their own. They also receive heat and light from sun.6.This are the satellite that are natural in space and are not used officialy by the scientist.7.The natural satellite is made up of natural material, rock, minerals, water, dust etc.Artificial Satellites

1.The artificial satellite is a device placed in orbit around the earth, moon, or another planet.2.The artificial satellites are man made.3.The first artificial satellite was Sputnik I.4.The artificial satellites are objects humans propel through the earth's atmosphere in order to orbit around the earth.5.The electrical power required by satellite is provided by panels of solar cells and small nuclear reactors.6.These are used and controlled by the astronomers and are used upto their will.7.The artificial satellite is made out of metal and electronics material.

read the question idiot ...... we have to find the permissible error in the measurement of refractive index of the material of prism

the correct option is (c)

apparent depth = real depth/refractive index

= 6/1.5 = 4 cm

it is wrong

Refractive index of a transparent medium is defined the ratio of speed of light in vacuum and speed of light in medium.

Is given by : n = c/v

Where, n is the refractive index.c is the speed of light in vacuum.v is the speed of light in medium.-------------

It has no units. Because it is the ratio of quantities which are similar.

what did the first creature evolve on the earth

Byalalu, about 40 km from Banglore

Mass of the wooden block = m= 6 kg

dimensions = 30 cm × 15 cm × 10 cm

the weight of the wooden block applies a thrust on the table top.

That is,Thrust = F = mg= 6 kg × 9.8 m/s²= 58.8 N

Area of a side = length × breadth = 15 cm × 10 cm = 150 cm² = 0.15 m²

Pressure = thrust/ areaPressure = 58.8 /0.15= 392 N/m²

The same thrust in implied when it lies on the given dimension.Area= length × breadth= 30 × 15= 450= 0.45 m²

Pressure = 58.8/0.45= 130.66 N/m²

Frictional Force is a necessary Evil. It plays a very important role in our daily activities.

If frictional force is absent then we may face the following consequences:

1. We cannot walk .2. We will not get a grip to hold things, then we cannot eat,write,Hold pen or pencil etc.3. Moving things cannot be stopped.4.Buildings cannot be constructed.5. We cannot fix a nail to the wall.6.We cannot stand properly without a grip.7.we would keep slipping.8.Nothing will be steady on ground. , things will not be at a proper places because of no grip.9.Brakes in the car / vehicles will be useless.10. Finally all the things, including us will be floating in the air.

It is believed that magnetic field lines originate from the poles…. Therefore there is crowding in the poles as alllines are leaving and entering

Imagine u have to go to a movie, and there is only on entrance to the complex and there are 4 screens, there will ppl who will be watching a movie in screen 1 and some in screen 2 but all them will enter through the common entrance therefore there is crowding in the entrance but once inside the complex there will be less crowd…..

a) is the correct answer

how can we write 1kg = 1/a

Metalsaregood conductorof heat because they have free electrons in the outer shell of the atoms which are not tightly bound to their atoms and are free to transport heat energy. However, the electrons in theglassare tightly bound to their atoms and are not free to flow. This makesglass poor conductorof heat.