 |
1 | |
A baseball pitcher hurls a 149 g baseball at 41.0 m/s. How much kinetic energy will be removed from the ball when it is stopped by the catcher's mitt? |
| | A) | 6.11 J |
| | B) | 125 J |
| | C) | 250 J |
| | D) | 9.33 J |
|
|
2 | |
In one kind of nuclear reaction, a large, heavy atomic nucleus splits into smaller, lighter, fast-moving nuclei of different elements. What is the best description of this energy transformation? |
| | A) | nuclear energy to chemical energy |
| | B) | chemical energy to nuclear energy |
| | C) | mass converted into thermal energy |
| | D) | thermal energy converted into mass |
|
|
3 | |
This graph represents the energy of a penny that falls from a table. What form of energy does each line on the graph represent?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070890862/141729/SF10_Ch05_QMC2_3.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"> (13.0K)</a>]]>
|
| | A) | Line 1 is kinetic energy. Line 2 is gravitational potential energy. |
| | B) | Line 1 is gravitational potential energy. Line 2 is kinetic energy. |
| | C) | Line 1 is total energy. Line 2 is gravitational potential energy. |
| | D) | Line 1 is gravitational potential energy. Line 2 is total energy. |
|
|
4 | |
What is the best energy description of the chemical reaction diagrammed below?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0070890862/141729/SF10_Ch05_QMC2_4.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"> (10.0K)</a>]]>
|
| | A) | Reactant chemicals release energy and form lower energy products. |
| | B) | Reactant chemicals release energy and form higher energy products. |
| | C) | Reactant chemicals absorb energy, forming lower energy products. |
| | D) | Reactant chemicals absorb energy, forming higher energy products. |
|
|
5 | |
A model airplane is powered by a twisted rubber band. As the rubber band unwinds, it turns a propeller and the plane gains altitude. What is the best description of the energy conversion in this process? |
| | A) | Elastic potential energy into kinetic energy into gravitational potential energy |
| | B) | gravitational potential energy into kinetic energy into elastic potential energy |
| | C) | kinetic energy into elastic potential energy into gravitational potential energy |
| | D) | elastic potential energy into gravitational potential energy into kinetic energy |
|
|
6 | |
Evan did 11 J of work moving his ScienceFocus 10 textbook from the floor to his desk. What is the best description of the change in gravitational potential energy of the textbook, if the book is lifted straight up slowly and steadily? |
| | A) | increases by more than 11 J |
| | B) | increases by less than 11 J |
| | C) | increases by 11 J |
| | D) | Gravitational potential energy does not change, because energy is conserved. |
|
|
7 | |
What force is needed to lift a 4.54 kg bag of sugar at constant speed? |
| | A) | 4.54 N |
| | B) | 44.5 N |
| | C) | 0.463 N |
| | D) | The force cannot be calculated unless you know the distance the sugar is lifted. |
|
|
8 | |
Janelle climbs the ladder to a 3.00 m high diving board. By how much does this increase her gravitational potential energy, if she has mass 62.0 kg? |
| | A) | 9.81 J |
| | B) | 186 J |
| | C) | 608 J |
| | D) | 1.82 x 103J |
|
|
9 | |
A 0.018 kg dart falls from a dart board 1.58 m above the floor. What is the maximum kinetic energy the dart can have just before striking the ground? |
| | A) | 0.028 J |
| | B) | 0.28 J |
| | C) | 0.18 J |
| | D) | You cannot calculate the kinetic energy unless you know the speed of the dart. |
|
|
10 | |
Which of the following statements correctly describes gravitational potential energy? |
| | A) | always measured from the surface of the earth |
| | B) | can be calculated without picking a reference point |
| | C) | must be calculated using the height above a reference point |
| | D) | calculations must include horizontal as well as vertical movement of an object when it is lifted |
|
|
11 | |
Which of the following energy sources depends most directly on transforming gravitational potential energy into a useful form of energy? |
| | A) | dams and hydroelectric generators |
| | B) | coal burning thermoelectric generating stations |
| | C) | nuclear power stations |
| | D) | wind powered electrical generators |
|