20 Questions
| Total Attempts: 1553

Questions and Answers

- 1.A boat travels 12.0 m while it reduces its velocity from 9.5 m/s to 5.5 m/s. What is the magnitude of the boat’s acceleration while it travels the 12.0 m?
- A.
2.5 m/s2

- B.
1.3 m/s2

- C.
3.0 m/s2

- D.
7.5 m/s2

- 2.A warehouse employee is pushing a 30.0 kg desk across a floor at a constant speed of 0.50 m/s. How much work must the employee do on the desk to change the speed to 1.00 m/s?
- A.
11.3 J

- B.
3.75 J

- C.
7.50 J

- D.
8.44 J

- 3.An object with an initial velocity of 3.50 m/s moves east along a straight and level path. The object then undergoes a constant acceleration of 1.80 m/s2 east for a period of 5.00 s. How far does the object move while it is accelerating?
- A.
40.0 m

- B.
6.30 m

- C.
17.5 m

- D.
27.2 m

- 4.Which of the following best determines the amount of energy of a single photon of light?
- A.
The frequency of the photon

- B.
The speed of the photon

- C.
The material the photon moves through

- D.
The time it takes the photon to reach a destination

- 5.A car traveling on a level road initially has 440 kJ of mechanical energy. After the brakes are applied for a few seconds, the car has only 110 kJ of mechanical energy. What best accounts for the missing mechanical energy?
- A.
Most of the missing mechanical energy has been converted to heat energy through friction.

- B.
Half the missing mechanical energy has been converted to heat energy, and the other half has been destroyed.

- C.
Most of the missing mechanical energy has been converted to gravitational potential energy.

- D.
Half the missing mechanical energy has been converted to kinetic energy, and the other half has been converted to potential energy.

- 6.Which statement best explains the difference between light waves traveling through a vacuum and light waves traveling through a medium?
- A.
Light waves traveling through a vacuum travel faster than light waves traveling through a medium.

- B.
Light waves traveling through a vacuum are transverse, but light waves traveling through a medium are longitudinal.

- C.
Light waves traveling through a vacuum have no mass, but light waves traveling through a medium have a mass greater than zero.

- D.
Light waves traveling through a vacuum have a shorter wavelength than light waves traveling through a medium.

- 7.Which of the following is the best evidence that work has been done on or by an object?
- A.
The energy of the object has changed.

- B.
The velocity of the object remains constant.

- C.
The mass of the object has changed.

- D.
The direction the object is moving remains constant.

- 8.An engineer is designing an instrument to examine the interior of a piece of wood without cutting it. The engineer decides to pass electromagnetic radiation through the wood to a detector on the other side. Which type of electromagnetic radiation would be most suitable for this investigation?
- A.
X-rays

- B.
Visible light

- C.
Radio waves

- D.
Ultraviolet light

- 9.What is the impulse on a 45,000 kg airplane when it changes its velocity from 242 m/s to 258 m/s?
- A.
720,000 kg⋅m/s

- B.
16 kg⋅m/s

- C.
2,800 kg⋅m/s

- D.
440,000 kg⋅m/s

- 10.A train passes a stationary observer. Which of the following best describes how the amplitude and the apparent frequency of the sound waves heard by the observer change as the train moves away?
- A.
Both the amplitude and the apparent frequency decrease.

- B.
Both the amplitude and the apparent frequency increase.

- C.
The amplitude of the sound waves increases, and the apparent frequency decreases.

- D.
The amplitude of the sound waves decreases, and the apparent frequency increases.

- 11.Which action will not induce a potential difference in a coil of wire?
- A.
Holding the coil in a stationary magnetic field

- B.
Moving a magnet through the coil

- C.
Holding the coil in a stationary magnetic field

- D.
Moving the coil and a magnet toward each other

- 12.Which situation is a good example of the transfer of energy through radiation?
- A.
A snake’s body temperature increases when the snake lies in the sun.

- B.
A fan cools the CPU in a computer.

- C.
Energy passes from one person’s hand to another person when they shake hands.

- D.
Warm air that is less dense rises to the ceiling of a room.

- 13.Two people each have a mass of 55 kg. They are both in an elevator that has a mass of 240 kg. When the elevator begins to move, the people and the elevator have an upward acceleration of 1.00 m/s2. What is the net force that acts on the elevator as it accelerates upward at 1.00 m/s2?
- A.
350 N

- B.
9.8 N

- C.
110 N

- D.
130 N

- 14.The center of a 910 kg satellite is 9.9×106 m from Earth’s center. What is the gravitational force between the satellite and Earth?
- A.
3.7×103N

- B.
4.5×103N

- C.
8.9×103N

- D.
1.7×106N

- 15.Two charged spheres are 16 cm apart. If the spheres are moved closer to each other so that they are 8 cm apart, how will the force between them change?
- A.
The force will increase by a factor of 4.

- B.
The force will decrease by a factor of 2.

- C.
The force will increase by a factor of 2.

- D.
The force will decrease by a factor of 4.

- 16.A musical note has a frequency of 512 Hz. If the wavelength of the note is 0.685 m, what is the speed of the sound of that note?
- A.
351 m/s

- B.
345 m/s

- C.
841 m/s

- D.
0.00120 m/s

- 17.A bus is moving forward at 20 m/s. A student on the bus throws a tennis ball horizontally at 15 m/s toward the front of the bus. From the perspective of an observer on the sidewalk outside the bus, the tennis ball appears to move at —
- A.
35 m/s

- B.
5 m/s

- C.
15 m/s

- D.
20 m/s

- 18.Which action makes use of a magnetic force?
- A.
A person puts a bank card in an electronic reader to buy an item.

- B.
A store clerk finds the price of an item by moving the item over a laser light.

- C.
A parent measures a child’s temperature by touching a thermometer to the child’s head.

- D.
A student measures the mass of a book using a spring scale.

- 19.Sound travels through air at a speed of 342 m/s at room temperature. What is the frequency of a sound wave with a wavelength of 1.8 m, to the nearest whole Hz?
- A.
190

- B.
180

- C.
170

- D.
150

- 20.Suppose Earth orbited a star whose mass was double the mass of the sun. If the radius of Earth’s orbit remained the same as it is now, then compared with the gravitational force between Earth and the sun, the gravitational force between Earth and the star would be —
- A.
Two times as much

- B.
Half as much

- C.
The same

- D.
Four times as much

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