Choose the best answer.
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1 | |
An object at rest may have ______________. |
| | A) | velocity |
| | B) | momentum |
| | C) | kinetic energy |
| | D) | potential energy |
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2 | |
A moving object does not necessarily have ________________. |
| | A) | velocity |
| | B) | momentum |
| | C) | kinetic energy |
| | D) | potential energy |
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3 | |
An object that has linear momentum must also have _________________. |
| | A) | acceleration |
| | B) | angular momentum |
| | C) | kinetic energy |
| | D) | potential energy |
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4 | |
The total amount of energy (including the rest energy of matter) in the universe _________________. |
| | A) | cannot change |
| | B) | can decrease but not increase |
| | C) | can increase but not decrease |
| | D) | can either increase or decrease |
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5 | |
In the cylinder of an automobile engine, the chemical energy of gasoline is initially transformed into ____________________. |
| | A) | mechanical energy |
| | B) | heat energy |
| | C) | electrical energy |
| | D) | potential energy |
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6 | |
Two balls, one of mass 5 kg and the other of mass 10 kg, are dropped simultaneously from a window. When they are 1 m above the ground, the balls have the same ____________________. |
| | A) | kinetic energy |
| | B) | potential energy |
| | C) | momentum |
| | D) | acceleration |
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7 | |
A bomb dropped from an airplane explodes in midair. |
| | A) | Its total kinetic energy increases |
| | B) | Its total kinetic energy decreases |
| | C) | Its total momentum increases |
| | D) | Its total momentum decrease |
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8 | |
The operation of a rocket is based upon ________________. |
| | A) | pushing against its launching pad |
| | B) | pushing against the air |
| | C) | conservation of linear momentum |
| | D) | conservation of angular momentum |
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9 | |
When a spinning skater pulls in her arms to turn faster, _________________. |
| | A) | her angular momentum increases |
| | B) | her angular momentum decreases |
| | C) | her angular momentum remains the same |
| | D) | any of the above, depending on the circumstances |
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10 | |
Einstein's general theory of relativity ________________. |
| | A) | relates the movement of small particles in a fluid to their bombardment by molecules |
| | B) | describes light as having both wave and particle properties |
| | C) | interprets gravity as a distortion in the structure of space and time |
| | D) | proposed that heat was a form of energy |
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11 | |
The chief source of energy in the world today is __________________. |
| | A) | coal |
| | B) | oil |
| | C) | natural gas |
| | D) | uranium |
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12 | |
The work done in holding a 50-kg object at a height of 2 m above the floor for 10 s is ____________________. |
| | A) | 0 |
| | B) | 250 J |
| | C) | 1000 J |
| | D) | 5880 J |
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13 | |
A total of 4900 J is used to lift a 50-kg mass. The mass is raised to a height of ________________. |
| | A) | 10 m |
| | B) | 98 m |
| | C) | 960 m |
| | D) | 245 km |
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14 | |
A 40-kg boy runs up a flight of stairs 4 m high in 4 s. His power output is _______________. |
| | A) | 160 W |
| | B) | 392 W |
| | C) | 40 W |
| | D) | 1568 W |
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15 | |
Car A has a mass of 1000 kg and is moving at 60 km/h. Car B has a mass of 2000 kg and is moving at 30 km/h. The kinetic energy of car A is ________________. |
| | A) | half that of car B |
| | B) | equal to that of car B |
| | C) | twice that of car B |
| | D) | 4 times that of car B |
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16 | |
Car A has a mass of 1000 kg and is moving at 60 km/h. Car B has a mass of 2000 kg and is moving at 30 km/h. The momentum of car A is ________________. |
| | A) | half that of car B |
| | B) | equal to that of car B |
| | C) | twice that of car B |
| | D) | 4 times that of car B |
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17 | |
A 1-kg ball is thrown in the air. When it is 10 m above the ground, its speed is 3 m/s. At this time most of the ball's total energy is in the form of ________________. |
| | A) | kinetic energy |
| | B) | potential energy relative to the ground |
| | C) | rest energy |
| | D) | momentum |
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18 | |
The smallest part of the total energy of the ball of Question 17 is _______________. |
| | A) | kinetic energy |
| | B) | potential energy relative to the ground |
| | C) | rest energy |
| | D) | momentum |
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19 | |
A 10,000-kg freight car moving at 2 m/s collides with a stationary 15,000-kg freight car. The two cars couple together and move off at ___________________. |
| | A) | 0.8 m/s |
| | B) | 1 m/s |
| | C) | 1.3 m/s |
| | D) | 1.2 m/s |
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20 | |
The lightest particle in an atom is an electron, whose rest mass is 9.1 × 10-31 kg. The energy equivalent of this mass is approximately _________________. |
| | A) | 10-13 J |
| | B) | 10-15 J |
| | C) | 3 × 10-23 J |
| | D) | 10-47 J |
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