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1 | |
Which action is an example of doing work, as physicists use the term? |
| | A) | stretching a rubber band |
| | B) | pushing on a stuck car which refuses to move |
| | C) | heating water on a stove |
| | D) | getting paid for doing scientific experiments |
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2 | |
For what purpose did James Joule use this apparatus?
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| | A) | finding the force of gravity on a falling weight |
| | B) | developing a new technology for heating water |
| | C) | showing that energy is always conserved |
| | D) | measuring amount of heat produced when a known work is done |
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3 | |
Julius Mayer wrote a scientific paper describing the relation between heat and energy. How did other scientists receive his ideas? |
| | A) | accepted immediately as a great achievement |
| | B) | regarded as interesting but unproven |
| | C) | overlooked, because Mayer did not use math and physics correctly to interpret his observations |
| | D) | rejected, because they were obviously wrong |
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4 | |
What conclusion did Count Rumford draw from his observations that the metal cylinders became extremely hot when holes were drilled in them to make cannon barrels? |
| | A) | Caloric fluid was being created by the drilling. |
| | B) | Caloric fluid did not exist. |
| | C) | Caloric fluid was flowing from the moving drill to the stationary cannon barrel |
| | D) | Caloric fluid in the tools was turning into thermal energy. |
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5 | |
When magnesium burns, heat and light are released. However, the mass of the ashes is greater than the original mass of magnesium. What did scientists learn about heat from this observation? |
| | A) | Heat is not a substance that materials like magnesium contain, as phlogiston theory suggested. |
| | B) | Heat cannot flow from one object to another, as the caloric theory suggested. |
| | C) | Energy cannot be created or destroyed, as the laws of thermodynamics state. |
| | D) | All mechanical processes convert some energy to heat. |
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6 | |
Which statement about thermal energy is correct, according to the laws of thermodynamics? |
| | A) | Thermal energy cannot be converted to work. |
| | B) | Thermal energy flows naturally from hotter to colder objects. |
| | C) | Energy, in the form of thermal energy, can be created by burning fuels. |
| | D) | Thermal energy cannot be transferred from one object to another. |
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7 | |
What is the best description of the change in the motion of a particle when an iron frying pan is heated on a stove? |
| | A) | faster motion, greater kinetic energy |
| | B) | faster motion, reduced kinetic energy |
| | C) | slower motion, reduced kinetic energy |
| | D) | slower motion, greater kinetic energy |
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8 | |
What is the best analysis of this force-distance graph?
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| | A) | constant force, 46 J of work done |
| | B) | increasing force, 46 J of work done |
| | C) | constant force, 56 J of work done |
| | D) | increasing force, 56 J of work done |
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9 | |
The graph below shows the force an archer must apply to pull back the arrow in a bow. What does the area of the shaded part of the graph represent?
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| | A) | force applied to the arrow |
| | B) | distance the archer's hand moves back |
| | C) | work done on the bow |
| | D) | energy wasted by the archer |
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10 | |
What force would you have to exert to do 1.54 J of work while lifting a hammer 35 cm in order to pound a nail? |
| | A) | 0.044 N |
| | B) | 0.23 N |
| | C) | 0.54 N |
| | D) | 4.4 N |
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11 | |
Sally exerts a force of 54.5 N on a shovel while clearing snow from her driveway. If she did 145 J of work, how far did she push the snow? |
| | A) | 2.66 m |
| | B) | 0.376 m |
| | C) | 7.9 x 103 m |
| | D) | There is not enough information to calculate the distance. |
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12 | |
To increase traction on slippery winter roads, George put a 10 kg sandbag into the trunk of his car. He lifted it 0.75 m with a force of 102 N. How much work did he do? |
| | A) | 7.5 J |
| | B) | 76.5 J |
| | C) | 765 J |
| | D) | 1020 J |
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13 | |
Based on the formula for work, what can you conclude about the relationships among the units for force, distance, and work? |
| | A) | 1 J = 1 N + 1 m |
| | B) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070890862/141728/SF10_Ch04_Q27b.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>]]>
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| | C) | 1 J = 1 N ( 1 m |
| | D) | Joules are not related to newtons and metres. |
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14 | |
In the work formula below what are the correct SI units for each quantity (reading left to right)?
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| | A) | j, n, m |
| | B) | J, N, m |
| | C) | J, N, M |
| | D) | J., N., m. |
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15 | |
Which of the following ways of rearranaging the work formula below is correct?
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| | A) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070890862/141728/SF10_Ch04_Q29e.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>]]>
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| | B) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070890862/141728/SF10_Ch04_Q29b.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>]]>
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| | C) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070890862/141728/SF10_Ch04_Q29c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>]]>
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| | D) |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070890862/141728/SF10_Ch04_Q29d.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>]]>
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