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Unit 4 Exam Physics
Materials from elearning-gizmo assessments

2. Based on the setup below, which of the following statements is true
Based on the setup below, which of the following statements is true? (Assume the car starts at rest and there is no friction.)
The car will easily smash the egg.
The car will just barely crack the egg.
The car will touch the egg but won't break it.
The car will never reach the egg.

3. Based on the setup below, which of the following statements is true
Based on the setup below, which of the following statements is true? (Assume the car starts at rest and there is no friction.)
The car will easily smash the egg.
The car will just barely crack the egg.
The car will touch the egg but won't break it.
The car will never reach the egg.

4. A 0. 05-kg car starts from rest at a height of 0. 95 m
A 0.05-kg car starts from rest at a height of 0.95 m. Assuming no friction, what is the kinetic energy of the car when it reaches the bottom of the hill? (Assume g = 9.81 m/s2.)
  A J
  B J
  C J
  D J

5. A 0. 05-kg car starts from rest at a height of 0. 95 m
A 0.05-kg car starts from rest at a height of 0.95 m. Assuming no friction, what is the kinetic energy of the car when it reaches the bottom of the hill? (Assume g = 9.81 m/s2.)
  A J
  B J
  C J
  D J

6. Suppose a 0. 04-kg car traveling at 2. 00 m/s can barely break an egg
Suppose a 0.04-kg car traveling at 2.00 m/s can barely break an egg. What is the minimum speed a 0.08-kg car would need to have in order to break the egg?
  A m/s
  B m/s
  C m/s
D m/s

7. Suppose a 0. 04-kg car traveling at 2. 00 m/s can barely break an egg
Suppose a 0.04-kg car traveling at 2.00 m/s can barely break an egg. What is the minimum speed a 0.08-kg car would need to have in order to break the egg?
  A m/s
  B m/s
  C m/s
D m/s

8. A 1-kg car and a 2-kg car are both released from the top of the same hill and roll down a frictionless track. At the bottom of the hill, which car will have the greater speed? Which car will have the greater kinetic energy?
  A. The 1-kg car will have greater speed, and the 2-kg car will have greater kinetic energy.
  B. The 2-kg car car will have greater speed, and the 1-kg car will have greater kinetic energy.
  C. The cars will have equal speeds and equal kinetic energies.
  D. The cars will have equal speeds and the 2-kg car will have greater kinetic energy.

9. A 1-kg car and a 2-kg car are both released from the top of the same hill and roll down a frictionless track. At the bottom of the hill, which car will have the greater speed? Which car will have the greater kinetic energy?
  A. The 1-kg car will have greater speed, and the 2-kg car will have greater kinetic energy.
  B. The 2-kg car car will have greater speed, and the 1-kg car will have greater kinetic energy.
  C. The cars will have equal speeds and equal kinetic energies.
  D. The cars will have equal speeds and the 2-kg car will have greater kinetic energy.

10. A. Increase the starting height of the sled.
  D. All of the above.
How could you increase the number of snowmen destroyed by the sled sliding down the hill?
  A. Increase the starting height of the sled.
  B. Increase the mass of the sled.
  C. Increase the starting kinetic energy of the sled
D. All of the above

11. A. Increase the starting height of the sled.
  D. All of the above.
How could you increase the number of snowmen destroyed by the sled sliding down the hill?
  A. Increase the starting height of the sled.
  B. Increase the mass of the sled.
  C. Increase the starting kinetic energy of the sled
D. All of the above

12. A sled starts at rest with 51,450 J of potential energy
A sled starts at rest with 51,450 J of potential energy. After traveling part of the way down the slope, the sled has 32,781 J of potential energy. If there is no friction, what is the kinetic energy of the sled?
  A. 18,669 J
  B. 32,781 J
  C. 51,450 J
  D. 84,231 J

13. A sled starts at rest with 51,450 J of potential energy
A sled starts at rest with 51,450 J of potential energy. After traveling part of the way down the slope, the sled has 32,781 J of potential energy. If there is no friction, what is the kinetic energy of the sled?
  A. 18,669 J
  B. 32,781 J
  C. 51,450 J
  D. 84,231 J

14. What can you say about the potential energy of the two sleds shown below?
A. Sled A has more potential energy.
B. Sled B has more potential energy.
C. The two sleds have the same potential energy.
D. There is not enough information to know which sled has more potential energy.

15. What can you say about the potential energy of the two sleds shown below?
A. Sled A has more potential energy.
B. Sled B has more potential energy.
C. The two sleds have the same potential energy.
D. There is not enough information to know which sled has more potential energy.

16. What type of wave is shown below?
A. Transverse wave
B. Longitudinal wave
C. Combined wave
D. Sound wave

17. What type of wave is shown below?
A. Transverse wave
B. Longitudinal wave
C. Combined wave
D. Sound wave

18. What is the amplitude and wavelength of the wave shown below?
A. Amplitude: 30 cm; wavelength: 60 cm
B. Amplitude: 30 cm; wavelength: 110 cm
C. Amplitude: 60 cm; wavelength: 60 cm
D. Amplitude: 60 cm; wavelength: 110 cm

19. What is the amplitude and wavelength of the wave shown below?
A. Amplitude: 30 cm; wavelength: 60 cm
B. Amplitude: 30 cm; wavelength: 110 cm
C. Amplitude: 60 cm; wavelength: 60 cm
D. Amplitude: 60 cm; wavelength: 110 cm

20. What is the amplitude and wavelength of the wave shown below?
A. Amplitude: 15 cm; wavelength: 150 cm
B. Amplitude: 30 cm; wavelength: 150 cm
C. Amplitude: 30 cm; wavelength: 200 cm
D. Amplitude: 150 cm; wavelength: 30 cm

21. What is the amplitude and wavelength of the wave shown below?
A. Amplitude: 15 cm; wavelength: 150 cm
B. Amplitude: 30 cm; wavelength: 150 cm
C. Amplitude: 30 cm; wavelength: 200 cm
D. Amplitude: 150 cm; wavelength: 30 cm

22. What is the best estimate of the frequency of the wave shown below?
A Hz
B Hz
C Hz
D Hz

23. What is the best estimate of the frequency of the wave shown below?
A Hz
B Hz
C Hz
D Hz

24. How could you increase the power of a wave in a spring?
A. Increase the amplitude.
B. Increase the frequency.
C. Increase the tension on the spring.
D. All of the above

25. How could you increase the power of a wave in a spring?
A. Increase the amplitude.
B. Increase the frequency.
C. Increase the tension on the spring.
D. All of the above

26. A power drill runs at a voltage of 120 V and draws a current of 4 A
A power drill runs at a voltage of 120 V and draws a current of 4 A. What is the wattage of the drill?
A. 4 W
B. 120 W
C. 124 W
D. 480 W

27. A power drill runs at a voltage of 120 V and draws a current of 4 A
A power drill runs at a voltage of 120 V and draws a current of 4 A. What is the wattage of the drill?
A. 4 W
B. 120 W
C. 124 W
D. 480 W

28. If it takes 15 minutes to dry your hair with a 1
If it takes 15 minutes to dry your hair with a kW hair drier, how much energy is used in drying your hair?
A kWh
B kWh
C kWh
D kWh

29. If it takes 15 minutes to dry your hair with a 1
If it takes 15 minutes to dry your hair with a kW hair drier, how much energy is used in drying your hair?
A kWh
B kWh
C kWh
D kWh

30. In an area in which electricity costs 8 cents/kilowatt-hour, a 5 kW clothes dryer runs for 90 minutes to dry a load of laundry. How much did it cost to dry these clothes?
A. $0.20
B. $0.30
C. $0.45
D. $0.60

31. In an area in which electricity costs 8 cents/kilowatt-hour, a 5 kW clothes dryer runs for 90 minutes to dry a load of laundry. How much did it cost to dry these clothes?
A. $0.20
B. $0.30
C. $0.45
D. $0.60

32. A microwave can reheat 1 cup of coffee in 30 seconds
A microwave can reheat 1 cup of coffee in 30 seconds. It takes a coffee-maker 10 minutes to brew 12 cups of coffee. If the coffee-maker requires 900 watts of power and the microwave requires 1200 watts of power, does it require more energy to brew 12 cups with the coffee-maker or reheat 12 cups of coffee in a microwave?
A. The coffee-maker requires more energy.
B. The microwave requires more energy.
C. They require the same amount of energy.
D. The answer cannot be determined without more information.

33. A microwave can reheat 1 cup of coffee in 30 seconds
A microwave can reheat 1 cup of coffee in 30 seconds. It takes a coffee-maker 10 minutes to brew 12 cups of coffee. If the coffee-maker requires 900 watts of power and the microwave requires 1200 watts of power, does it require more energy to brew 12 cups with the coffee-maker or reheat 12 cups of coffee in a microwave?
A. The coffee-maker requires more energy.
B. The microwave requires more energy.
C. They require the same amount of energy.
D. The answer cannot be determined without more information.

34. In the series circuit shown below, what would happen if one of the light bulbs and its attached wire segment were removed?
A. The remaining lights would go out.
B. The remaining lights would shine with the same brightness.
C. The remaining lights would shine less brightly.
D. The remaining lights would get brighter.

35. In the series circuit shown below, what would happen if one of the light bulbs and its attached wire segment were removed?
A. The remaining lights would go out.
B. The remaining lights would shine with the same brightness.
C. The remaining lights would shine less brightly.
D. The remaining lights would get brighter.

36. In the parallel circuit shown below, what would happen if one of the light bulbs and its attached wire segment were removed?
A. The remaining lights would go out.
B. The remaining lights would shine with the same brightness.
C. The remaining lights would shine less brightly.
D. The remaining lights would get brighter.

37. In the parallel circuit shown below, what would happen if one of the light bulbs and its attached wire segment were removed?
A. The remaining lights would go out.
B. The remaining lights would shine with the same brightness.
C. The remaining lights would shine less brightly.
D. The remaining lights would get brighter.

38. In the circuit shown below, the battery voltage is 20 volts
In the circuit shown below, the battery voltage is 20 volts. What will be the reading of the ammeter shown in the circuit?
Two-resistor series circuit
A amperes
B amperes
C amperes
D amperes

39. In the circuit shown below, the battery voltage is 20 volts
In the circuit shown below, the battery voltage is 20 volts. What will be the reading of the ammeter shown in the circuit?
Two-resistor series circuit
A amperes
B amperes
C amperes
D amperes

40. B. Circuit B C. Circuit C D. Circuit D
If all four switches below are turned on, which light bulb will light up? (W is wood, S is silver, and Y is yarn.)
A. Circuit A
B. Circuit B
C. Circuit C
D. Circuit D

41. B. Circuit B C. Circuit C D. Circuit D
If all four switches below are turned on, which light bulb will light up? (W is wood, S is silver, and Y is yarn.)
A. Circuit A
B. Circuit B
C. Circuit C
D. Circuit D

42. A. The remaining light bulbs will go out.
What will happen when a light bulb is removed from the circuit below, leaving a gap?
A. The remaining light bulbs will go out.
B. The remaining light bulbs will dim.
C. The brightness of the remaining light bulbs will not change.
D. The remaining light bulbs will brighten.

43. A. The remaining light bulbs will go out.
What will happen when a light bulb is removed from the circuit below, leaving a gap?
A. The remaining light bulbs will go out.
B. The remaining light bulbs will dim.
C. The brightness of the remaining light bulbs will not change.
D. The remaining light bulbs will brighten.

44. What will happen when a light bulb is removed from the circuit below?
A. The remaining light bulbs will go out.
B. The remaining light bulbs will dim.
C. The brightness of the remaining light bulbs will not change.
D. The remaining light bulbs will brighten.

45. What will happen when a light bulb is removed from the circuit below?
A. The remaining light bulbs will go out.
B. The remaining light bulbs will dim.
C. The brightness of the remaining light bulbs will not change.
D. The remaining light bulbs will brighten.

46. What is the role of a fuse?
A. A fuse is used to turn lights on and off.
B. A fuse is used to break a circuit when there is too much current.
C. A fuse is used to increase the current in a circuit.
D. A fuse is used to create a short circuit.

47. What is the role of a fuse?
A. A fuse is used to turn lights on and off.
B. A fuse is used to break a circuit when there is too much current.
C. A fuse is used to increase the current in a circuit.
D. A fuse is used to create a short circuit.

48. A. ethanol plant B. light bulb C. corn D. solar cell
Which of these objects converts light to chemical energy?
A. ethanol plant
B. light bulb
C. corn
D. solar cell

49. A. ethanol plant B. light bulb C. corn D. solar cell
Which of these objects converts light to chemical energy?
A. ethanol plant
B. light bulb
C. corn
D. solar cell

50. Which energy path shows one way energy can get to a light bulb?
A. sun water dam light bulb
B. sun air wind turbine light bulb
C. sun corn ethanol plant light bulb
D. all of the above

51. Which energy path shows one way energy can get to a light bulb?
A. sun water dam light bulb
B. sun air wind turbine light bulb
C. sun corn ethanol plant light bulb
D. all of the above

52. What source of energy causes winds to blow around the Earth?
A. wind turbines
B. the Sun
C. the ocean
D. a chicken

53. What is electrical energy converted to inside a toaster?
A. thermal energy and light
B. nuclear energy
C. chemical energy
D. kinetic energy

54. What do wind turbines, hydroelectric dams, and ethanol plants have in common?
A. All produce electrical current without pollution.
B. All use generators to produce electrical current.
C. All convert gravitational potential energy to electrical current.
D. All convert thermal energy to electrical current.

55. A 2-kg block rests on a wall that is 3 m tall
A 2-kg block rests on a wall that is 3 m tall. What is the gravitational potential energy of the block? The force of gravity on Earth (g) is equal to 9.8 m/s2.
A. 3 joules
B. 6 joules
C joules
D joules