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1 | |
Work, in a scientific sense, is |
| | A) | any physical effort that makes you tired. |
| | B) | the time it takes to perform a task. |
| | C) | the product of a force and the distance an object moves as a result of the force. |
| | D) | measured in newtons. |
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2 | |
Which of the following scenarios represents an example of work? |
| | A) | carrying a book across a room. |
| | B) | holding a dictionary in your hand for five minutes. |
| | C) | moving a book from a lower shelf to a higher shelf in a bookcase. |
| | D) | moving a book from one end of a shelf to the other. |
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3 | |
Which choice below pairs a scientific term with the correct scientific unit? |
| | A) | work:newton |
| | B) | power:joule |
| | C) | force:joule |
| | D) | power:Watt |
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4 | |
A roller coaster converts energy from potential energy to kinetic energy and back again. Which of the following statements is true regarding the roller coaster as an energy converter? |
| | A) | Outside energy is required at many stages in a roller coaster ride. |
| | B) | The highest hill on the roller coaster is always the last hill so patrons can have the maximum thrill at the end of their ride. |
| | C) | Energy conversion is ideal because friction is kept at a maximum. |
| | D) | The maximum potential energy occurs at the top of the first hill. |
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5 | |
A bungee jumper will experience |
| | A) | maximum velocity when the cord is stretched to its maximum length. |
| | B) | maximum kinetic energy when the point of maximum stretch of the bungee cord is reached. |
| | C) | maximum potential energy when the point of maximum stretch of the bungee cord is reached. |
| | D) | considerably greater acceleration during the free-fall phase than during the recoil phase. |
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6 | |
Which of the following statements is correct? |
| | A) | Energy and power share the same units. |
| | B) | A bowling ball and a baseball dropped from the roof possess the same kinetic energy after falling five meters. |
| | C) | The potential energy of a bowling ball and a baseball on the ledge of a roof are the same. |
| | D) | As a bowling ball falls from a rooftop, its potential energy is converted to kinetic energy. |
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7 | |
When work is performed against a resistance, there is a change of energy such as |
| | A) | a decrease in temperature. |
| | B) | a decrease in potential energy. |
| | C) | an increase in potential energy. |
| | D) | no change in the combination of kinetic energy, potential energy, and/or temperature. |
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8 | |
When you stop at the top after climbing a flight of stairs you have |
| | A) | lost energy. |
| | B) | lost work. |
| | C) | gained potential energy. |
| | D) | gained kinetic energy. |
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9 | |
The kinetic energy of a moving object can be measured in terms of |
| | A) | how much work was done putting the object into motion. |
| | B) | how much work is needed to bring the object to a stop. |
| | C) | 1/2mv2. |
| | D) | Any of the above. |
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10 | |
One of the following forms of energy can move through the vacuum of outer space without any involvement of matter. |
| | A) | radiant |
| | B) | mechanical |
| | C) | nuclear |
| | D) | chemical |
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11 | |
The operation of which of the following devices involves a single change of one form of energy to another? |
| | A) | flashlight |
| | B) | nuclear power plant |
| | C) | lightbulb |
| | D) | coal power plant |
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12 | |
Almost all energy used on the earth can be traced back to the ultimate source of |
| | A) | petroleum |
| | B) | solar |
| | C) | coal |
| | D) | hydropower |
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13 | |
Considering all the energy transformation, the last form is likely to be |
| | A) | radiant. |
| | B) | chemical. |
| | C) | nuclear. |
| | D) | the one consumed. |
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14 | |
Today, most of the energy needs in the USA are supplied by |
| | A) | nuclear |
| | B) | coal |
| | C) | petroleum |
| | D) | natural gas |
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15 | |
Which of the following is the correct example of one of the five forms of energy? |
| | A) | Sound waves are a form of radiant energy. |
| | B) | Infrared radiation is an example of radiant energy. |
| | C) | Electricity is a form of nuclear energy. |
| | D) | Oxidation, or the loss of an electron, is a type of electrical energy. |
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16 | |
Which of the following occurs when one rides a bicycle? |
| | A) | The bicycle has kinetic energy by virtue of its motion. |
| | B) | The kinetic energy is obtained from the conversion of chemical energy stored in the rider's muscles. |
| | C) | The energy for riding the bicycle was originally generated in nuclear reactions in the sun. |
| | D) | All of the answers are correct. |
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17 | |
The primary source of energy for society today is obtained directly from |
| | A) | chemical energy. |
| | B) | nuclear energy. |
| | C) | solar energy. |
| | D) | geothermal energy. |
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18 | |
A difference in which one of the following factors is thought to determine whether natural gas or petroleum is formed from organic material? |
| | A) | The bacteria that convert the organic material to natural gas or petroleum. |
| | B) | The pressures at which natural gas and petroleum are formed. |
| | C) | The temperature at which natural gas and petroleum are formed. |
| | D) | The time it takes for natural gas to be formed compared to petroleum. |
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19 | |
Wind is considered a form of solar energy because |
| | A) | the wind has been used for centuries to move ships, grind grain, etc. |
| | B) | radiant energy from the sun heats different areas of the earth differentially and the resulting pressure differences give rise to the horizontal movement of air across the earth's surface. |
| | C) | there is more wind during the daylight hours than at night. |
| | D) | the wind pushes away clouds, which obscure the sun's rays. |
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20 | |
Which of the following would be considered a passive application of solar power? |
| | A) | solar cells |
| | B) | solar water heaters |
| | C) | orientation of a house to the sun |
| | D) | power tower |
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21 | |
Which one of the following sources of energy did not originate from the sun? |
| | A) | coal |
| | B) | geothermal energy |
| | C) | wind energy |
| | D) | biomass |
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22 | |
A roller coaster weighs 5000 kg fully loaded. The first hill of the ride has a height of 40 m above the ground. How much potential energy does the roller coaster possess when it is momentarily motionless at the top of the first hill before it begins its plunge? |
| | A) | 1.96 x 106 joules. |
| | B) | 2.0 x 105 joules. |
| | C) | 2.0 x 105 newtons. |
| | D) | 1.96 x 106 watts. |
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23 | |
The roller coaster from problem #22 dropped 30 meters to the low point between the first and second hills. What percentage of the roller coaster's potential energy at the top of the first hill had been lost as kinetic energy when the roller coaster had reached the low point after the first hill? |
| | A) | 100% |
| | B) | 75% |
| | C) | 50% |
| | D) | 25% |
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24 | |
If the roller coaster from problems #22 and #23 reached the low point after the first hill in 2.5 seconds, approximately how much horsepower was it generating at that point? |
| | A) | 600,000 horsepower |
| | B) | 800 horsepower |
| | C) | 746 watts |
| | D) | 80 horsepower |
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25 | |
One of the following produces electricity without any mechanical devices, hot fluids, or moving parts. |
| | A) | power tower |
| | B) | solar cell |
| | C) | OTEC |
| | D) | wind energy |
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