Benefits of Solar Energy

1. A 13-kg sled is moving at a speed of 3.0 m/s. At which of the following speeds will the sled have twice as much kinetic energy? (1 point)
1.5 m/s
4.2 m/s
6 m/s
9 m/s
2. Which of the following is an example of an object with elastic potential energy? (1 point)
a wind-up toy that has been wound up
a compressed basketball
a stretched rubber band
all of the above
3. Why is the gravitational potential energy of an object 1 meter above the moon’s surface less than its potential energy 1 meter above Earth’s surface? (1 point)
The object’s mass is less on the moon.
The object’s weight is more on the moon.
The object’s acceleration due to gravity is less on the moon.
both a and c
4. A 4-kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat’s gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8 m/s2? (1 point)
7 J
12 J
29 J
118 J
5. The total potential and kinetic energy of all the microscopic particles in an object make up its _____. (1 point)
chemical energy
electric energy
nuclear energy
thermal energy
6. Nuclear power plants are designed to convert nuclear energy into what type of energy? (1 point)
chemical
electrical
geothermal
mechanical
7. Which of the following statements is right according to the law of conservation of energy? (1 point)
Energy cannot be made.
Energy cannot be ruined.
Energy can be converted from one form to another.
all of the above
8. If no friction acts on a diver during a dive, then which of the following statements is right? (1 point)
The total mechanical energy of the system increases.
Potential energy can be converted into kinetic energy but not vice versa.
(KE+ PE)beginning = (KE + PE)end
all of the above
9. The kinetic energy of the pendulum bob in Figure 15-1 increases the most between locations _____.

(1 point)
A and B
A and C
B and D
C and D
10. The equation E = mc2 relates energy and _____. (1 point)
force
gravity
mass
work
11. Nonrenewable energy resources do not include which of the following? (1 point)
coal
hydrogen fuel cells
oil
uranium
12. A drawback of solar energy is that it _____. (1 point)
cannot be converted directly into electrical energy
depends on the climate
produces water pollution
is not a renewable resource
13. A benefit of a hydrogen fuel cell is that its byproduct is _____. (1 point)
carbon dioxide
oxygen
water
uranium
14. Based on your knowledge of energy conservation, which of the following statements is right? (1 point)
Manufacturers can increase a light bulb’s energy efficiency by using technology that increases the amount of electromagnetic energy the bulb converts from a given amount of electrical energy.
Energy can be conserved by turning off lights when they are not in use.
both a and b
neither a nor b
Note: Your teacher will grade your

1. The answer the teacher is looking for is probably (B) 4.2 m/s because that is the closest to the square root of 18, which is an exact value.
2. D. I reckon all of them involve potential energy because if a "release" happens to those objects, there will be movement.
3. C
4. my guess is D; it seems like you would multiply all those numbers.
5.D
6.B (I mean the point of nuclear POWER is the power of electricity)
7.D
8. C
9. I don’t know what figure 15.1 looks like
10. C
11. B
12. B
13. C (water), I reckon; it seems to me that the byproduct would include hydrogen in it.
14. C (C says both a and b; both a and b seem to be able to be seen as excellent thoughts)

One Response to “Someone please help me with t his science test on Energy?”