Question

Question 1 (5 points)

Dams are large structures located along rivers that use the river's flow to turn turbines and generate electricity. Dams are an example of
Question 1 options:


A)
hydroelectric energy.


B)
wind energy.


C)
batteries.


D)
potential mechanical energy.
Question 2 (5 points)

864.36 J of work are needed to accomplish a task. Approximately how much horsepower is required to achieve this task?
Question 2 options:


A)
864.36 hp


B)
1.16 hp


C)
441 hp


D)
0.59 hp
Question 3 (5 points)

A temperature of 273 K is the temperature at which water
Question 3 options:


A)
boils.


B)
is at its densest.


C)
evaporates.


D)
freezes.
Question 4 (5 points)

When an archer draws back their bowstring before they fire, what type of energy is stored in the bowstring?
Question 4 options:


A)
Thermal energy


B)
Nuclear energy


C)
Elastic potential energy


D)
Kinetic mechanical energy
Question 5 (5 points)

What needs to happen for combustion to occur?
Question 5 options:


A)
A fuel sits in the presence of a small amount of oxygen.


B)
The temperature of the fuel is lowered.


C)
The ignition point for a given fuel is met.


D)
Oxygen is removed from the area.
Question 6 (5 points)

What's the value of 57,281 joules in Btus?
Question 6 options:


A)
14.2 Btus


B)
37.7 Btus


C)
28.9 Btus


D)
54.3 Btus
Question 7 (5 points)

Why can the efficiency of a machine never be 100 percent?
Question 7 options:


A)
Friction converts some energy into a useless form.


B)
Machines can't transform energy from one type to another.


C)
Energy isn't conserved.


D)
The power used can't be measured accurately.
Question 8 (5 points)

A temperature of 200°F is equivalent to approximately
Question 8 options:


A)
840°C.


B)
37.8°C.


C)
232°C.


D)
93.3°C.
Question 9 (5 points)

Which of the following is an example of transferring thermal energy through convection?
Question 9 options:


A)
The heat from a hot pan handle is transferred into a chef's hand, causing a mild burn.


B)
A heater at the bottom of a pool causes warm water to rise to the top and cold water to sink.


C)
The energy from the sun reaches earth.


D)
A glow emitted from a burning fire can be seen by the human eye.
Question 10 (5 points)

Which of the following is accurate when discussing specific heat?
Question 10 options:


A)
The specific heat of a gas can be measured at constant pressure.


B)
Specific heat values for solids will never vary for different ranges of temperature.


C)
The specific heat of a gas can be measured at constant volume only.


D)
Specific heat values for liquids will never vary for different ranges of temperature.

Answer 1

1. A
2. B
3. D
4. C
5. C
6. D
7. A
8. D
9. B
10. A