Physics Answers

Q.3 A block of wood A of mass 10 kg is held on a rough horizontal table. An elastic string

connected to the block passes over a smooth pulley at the end of the table and then under a second smooth pulley carrying a body B of mass 5 kg as shown in Fig

The other end of the string is fixed to a point above the second pulley. When the 10 kg block is released, it moves with an acceleration of g/9. Determine the value of coefficient of friction between the block and the table.

https://imgur.com/a/4oSOLx2 (figure's image link)

Steep safety ramps are built beside mountain highways to enable vehicles with defective brakes to stop safely. A truck enters a 250-m ramp at a high speed v0, and travels 180 m in 6 s at constant deceleration before its speed is reduced to v0/2. Assuming the same constant deceleration, determine (a) the additional time required for the truck to stop, (b) the additional distance traveled by the truck.

A hydraulic cylinder has a 1 meter stroke. It lifts a 100kg weight in 2 seconds. What is the average power used by the cylinder to perform this work?

A 79 kg weight-watcher wishes to climb a

mountain to work off the equivalent of a large

piece of chocolate cake rated at 571 (food)

Calories.

How high must the person climb? The

acceleration due to gravity is 9.8 m/s

2

and 1

food Calorie is 103

calories.

Answer in units of km.

Suppose a layer of oil (refractive index is 1.45) floats on water (refractive index is 1.33).If a ray of light shines onto the oil with an incidence angle of 40°, what is the angle formes between the ray and the surface of the water?

a) Given;

b)Formula:

c)Solution

d)Final answer with unit:

The center of gravity of a 45gram meter stick is at the 49 cm. mark. The stick is part of a lever which has the fulcrum at the 73 cm. mark. Where must an 86gram object be hung in order to have equilibrium? Show solutions.

How much time does a meter stick moving at 0.1c relative to an observer take to pass the

observer? The meter stick is parallel to its direction of motion.

A spacecraft antenna is at an angle of 10◦

relative to the axis of the spacecraft. If the

spacecraft moves away from the earth at a speed of 0.70c, what is the angle of the antenna

as seen from the earth?

In the Michelson-Morley experiment, the length of the paths of the two beams is 11 m each.

The wavelength of the light used is 6000 ̊A. If the expected fringe shift is 0.4, calculate the

velocity of the earth relative to the ether.

Light that is nonpolarized has an intensity of 6.0 W/m2. Rays of this

light are incident on two polarizing elements whose transmission

axes are at an angle of 450. What is the intensity of light emerging

from the second film?