Choose the best answer.
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1 | |
Which of the following units could be associated with a vector quantity? |
| | A) | kilogram |
| | B) | hour |
| | C) | liter |
| | D) | meter/second |
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2 | |
In which of the following examples is the motion of the car not accelerated? |
| | A) | A car turns a corner at the constant speed of 20 km/h |
| | B) | A car climbs a steep hill with its speed dropping from 60 km/h at the bottom to 15 km/h at the top |
| | C) | A car climbs a steep hill at the constant speed of 40 km/h |
| | D) | A car climbs a steep hill and goes over the crest and down on the other side, all at the same sped of 40 km/h |
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3 | |
While driving between Pittsburgh and Chicago, the driver of the car looks at the car's speedometer and notes a speed of 50 miles/hour. The speedometer is indicating the car's ___________________. |
| | A) | average speed |
| | B) | velocity |
| | C) | terminal speed |
| | D) | instantaneous speed |
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4 | |
The acceleration of a stone thrown upward is ________________. |
| | A) | greater than that of a stone thrown downward |
| | B) | the same as that of a stone thrown downward |
| | C) | less than that of a stone thrown downward |
| | D) | zero until it reaches the highest point in its path |
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5 | |
The weight of an object __________________. |
| | A) | is the quantity of matter it contains |
| | B) | is the force with which it is attracted to the earth |
| | C) | is basically the same quantity as its mass but is expressed in different units |
| | D) | refers to its inertia |
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6 | |
Compared with her mass and weight on the earth, an astronaut on Venus, where the acceleration of gravity is 8.8 m/s2, has _________________. |
| | A) | less mass and less weight |
| | B) | less mass and the same weight |
| | C) | less mass and more weight |
| | D) | the same mass and less weight |
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7 | |
A tennis player hits a tennis ball with a tennis racquet. If the force supplied by the racquet to the ball is the action force, what would be the reaction force? |
| | A) | the force transmitted from the racquet to the tennis player's arm |
| | B) | the resistance of air molecules on the tennis ball |
| | C) | the force exerted by the tennis ball on the racquet |
| | D) | the force exerted by the tennis ball on the opposing player's racquet |
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8 | |
When a boy pulls a cart, the force that causes him to move forward is _________________. |
| | A) | the force the cart exerts on him |
| | B) | the force he exerts on the cart |
| | C) | the force he exerts on the ground with is feet |
| | D) | the force the ground exerts on his feet |
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9 | |
A body moving in a circle at constant speed is accelerated ________________. |
| | A) | in the direction of motion |
| | B) | toward the center of the circle |
| | C) | away form the center of the circle |
| | D) | any of the above, depending upon the circumstances |
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10 | |
A car rounds a curve at 20 km/h. If it rounds the curve at 40 km/h, its tendency to overturn is _________________. |
| | A) | halved |
| | B) | doubled |
| | C) | tripled |
| | D) | quadrupled |
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11 | |
An astronaut inside an orbiting satellite feels weightless because __________________. |
| | A) | he or she is wearing a space suit |
| | B) | the satellite is falling towards the earth just as fast as the astronaut is, so there is no upward reaction force on him or her |
| | C) | there is no gravitational pull from the earth so far away |
| | D) | the sun's gravitational pull balances out the earth's gravitational pull |
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12 | |
An airplane whose airspeed is 200 km/h is flying in a wind of 80 km/h. The airplane's speed relative to the ground is between ___________________. |
| | A) | 80 and 200 km/h |
| | B) | 80 and 280 km/h |
| | C) | 120 and 200 km/h |
| | D) | 120 and 280 km/h |
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13 | |
How long does a car whose acceleration is 2 m/s2 need to go from 10 m/s to 30 m/s? |
| | A) | 10 s |
| | B) | 20 s |
| | C) | 40 s |
| | D) | 400 s |
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14 | |
A ball is thrown upward at a speed of 12 m/s. It will reach the top of its path in about __________________. |
| | A) | 0.6 s |
| | B) | 1.2 s |
| | C) | 1.8 s |
| | D) | 2.4 s |
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15 | |
A bicycle and its rider together have a mass of 80 kg. If the bicycle's speed is 6 m/s, the force needed to bring it to a stop in 4 s is ___________________. |
| | A) | 12 N |
| | B) | 53 N |
| | C) | 120 N |
| | D) | 1176 N |
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16 | |
The weight of 400 g of onions is _________________. |
| | A) | 0.041 N |
| | B) | 0.4 N |
| | C) | 3.9 N |
| | D) | 3920 N |
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17 | |
A 1200-kg car whose speed is 6 m/s rounds a turn whose radius is 30 m. The centripetal force on the car is _________________. |
| | A) | 48 N |
| | B) | 147 N |
| | C) | 240 N |
| | D) | 1440 N |
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18 | |
If the earth were 3 times as far from the sun as it is now, the gravitational force exerted on it by the sun would be ___________________. |
| | A) | 3 times as large as it is now |
| | B) | 9 times as large as it is now |
| | C) | one-third as large as it is now |
| | D) | one-ninth as large as it is now |
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19 | |
A woman whose mass is 60 kg on the earth's surface is in a spacecraft at an altitude of one earth's radius above the surface. Her mass there is _________________. |
| | A) | 15 kg |
| | B) | 30 kg |
| | C) | 60 kg |
| | D) | 120 kg |
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20 | |
A man whose weight is 800 N on the earth's surface is also in the spacecraft of Question 19. His weight there is ________________. |
| | A) | 200 N |
| | B) | 400 N |
| | C) | 800 N |
| | D) | 1600 N |
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