Physics Answers

A rifle used for target shooting has a small telescope so that the shooter can accurately aim at his target. Suppose the telescope has a diameter of 1.5 cm and the shooter is looking at two small birds that are 200 m away. Assuming a red light of wavelength 600 nm shining on the birds, calculate how far apart are the birds.

When light travels from one medium to another, the path of light is affected due to the

change in the optical density of the medium. Describe what happens to the speed of

light as it travels from less dense to a denser medium and how is the path of the ray of

light affected?

A satellite is in a circular orbit around the planet saturn. Derive the relationship between the period of the satellite, the mass of Saturn and the radius of orbit

Problem Solving: Solve the following problems. Show your complete solution and box your final answer.

A farmer attaches her tractor to a sled loaded with sacks of rice to the market. The tractor pulls the sled horizontally to the right with a force of 5000N, 36.9° with the horizontal. The

sled also experiences a frictional force pulling opposite to the direction of the displacement with a force of 3500N. The sled moves to the right with a displacement of 20m over a time period of 10 seconds.

a. Find the work done by the tractor.

b. Find the work done by friction.

c. Find the power of the tractor.

d. Find the power of friction.

Problem Solving: Solve the following problems. Show your complete solution and box your final answer.

A wall clock is placed on a wall so it can easily be seen. The gravitational potential energy experienced by the wall clock is 2.94 joules. If the mass of the wall clock is 200g, how high is

the clock relative to the ground?

Draw your own theoretical potential energy diagram that have the

following:

• Turning point (at least one)

• Equilibrium points (at least two)

A pulley is turning at 30 revolutions per second slows down uniformly to 20 revolutions per second in 2 seconds .

Calculate the number of revolutions it make to a complete stop.

You are filling a cylindrical drum (D = 22.5 in., H = 33.5 in.) with water flowing from a garden faucet at a rate of 10 GPM. How long will you have to wait to fill the drum? Express you answer in minutes.

You are filling a cylindrical drum (D = 22.5 in., H = 33.5 in.) with water flowing from a garden faucet at a rate of 10 GPM. How long will you have to wait to fill the drum? Express you answer in minutes.

If the sound intensity 4.0 m from a point sound source is 1.0 × 10^-⁶ Wm², what will be the sound intensity at each of the following distances from the source:

A. 1.0 m? And

B. 2.0 m?