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# Semester Two Study Guide

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Author: Jessica Ward

### Developing Effective Teams

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Tutorial

## Study Guide Key

This is just the answers any work for your problems can be found in their individual videos.

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## Problem 2

The period of Venus is 225 days. What is it's semi major axis?

## Problem 4

In each hand you hold a 0.16 kg peach. What is the gravitational force exerted by one peach on the other when their separation is (a) 0.25 m (b) 0.50 m?

## Problem 5

A 7.3 kg bowling ball is placed on a shelf 1.7 m above the floor. What is its gravitational potential energy?

## Problem 6

An object has a speed of 3.5 m/s and a kinetic energy of 14 J at t=0. At t=5 the object has a speed of 4.7 m/s. (a) what is the mass of the object? (b) what is the kinetic energy of the object at t=5?

## Problem 7

7. As you lift an 88 N box straight upward 3 m, you produce a power of 72 W. How long did it take to lift the box?

## Problem 20

20. How much thermal energy must be removed from a 0.21 kg chunk of ice to lower its temperature by 7.5 C?

## Problem 21

21. You add 0.0550 kg of ice at -10.2 C to a 3.99 kg bowl of water at 20.5 C. What is the final temperature of the system?

## Problem 22

22. How much energy is required to take 4.0g of -13 C ice and turn it to 115 C steam?

## Problem 24

24. A runner does 8.2 x 105 J of work and gives off 3.3 x 105 J of heat. What is the change in internal energy?

## Problem 25

25. An engine receives 770 J of heat from a hot reservoir and does 160 J or work. What is (a) the efficiency of the engine and (b) the heat given off to the cold reservoir?

## Problem 26

26. A fluid expands by 0.42 m3 at a pressure of 121 kPa. How much work is done by the fluid?

## Problem 27

27. A gas expands at a constant pressure of 190 kPa and does 82J of work. What is the change in volume?

## Problem 30

30. How fast would a motorist have to be traveling for a yellow (590 nm) traffic light to appear green (550nm) because of Doppler shift? Should the motorist be traveling toward or away from the traffic light to see this shift?

## Problem 31

31. Two starships, the Enterprise and the Constitution are approaching each other head on from a great distance. The separation between them is decreasing at a rate of 722.5 km/s. The Enterprise sends a laser signal toward the Constitution. If the Constitution observes a wavelength of 670.3 nm, what wavelength was emitted by the Enterprise?

## Problem 32

32. A cell phone transmits at a frequency of 1.25 x 108 Hz. What is the wavelength of the electromagnetic waves emitted by this phone?

## Problem 34

34. A TV screen is half blue and half white. The screen has 3,000,000 pixels. How many red dots are lit? How many green dots are lit? How many blue dots are lit?

## Problem 41

41. Vertically polarized light with an intensity of 0.23 W/m2 passes through a polarizer whose transmission axis is at an angle 42.0 with the vertical. What is the final intensity?

## Problem 42

42. Vertically polarized light passes through a polarizer whose transmission axis is at an angle to the vertical. If the initial intensity of the light is 0.54 W/m2 and the final intensity is 0.22 W/m2, what angle does the transmission axis of the polarizer make with the vertical?