Other Physics Answers

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?

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.

The police are investigating an accident. They have determined that the mass of car A is 2275 kg and the mass of car B is 1525 kg. From the skid marks and the data for the friction between the tires and concrete, the police determined that the cars , when locked together, hand a velocity of 31 km/h at an angle of 43 degrees North of the eastbound street. If the speed limit was 35 km/h on both streets:

a) should one or both cars be ticketed for speeding? Prove

b) Which car had the right of way at the intersection? Explain

c) Was one driver or both drivers at fault for the accident? Explain

For sodium chloride at low temperatures the equilibrium nearest-neighbor distance is 2.79 Å and the isothermal compressibility is 3.39 × 10⁻¹¹ 𝑚3⁄𝐽. Use this data to calculate the energy parameters 𝑛 and 𝐴, then estimate the Madelung and core overlap contributions to the energy per unit cell

In a certain solid, the potential energy of a pair of atoms is given by:

𝐸(𝑟) = − 𝐴/𝑟⁶ + 𝐵𝑒 ^{(− 𝑟 / 𝜌 )}

At an equilibrium atomic spacing of 0.15 nm, the binding energy is 10 % less than would be given for the attractive part alone. Calculate the characteristic length 𝜌.

Calculate the wavelength of Radio 4 which broadcasts on a frequency of 198, k, H, z,

198kHz.