POE Qtr. 2 Unit 2 Test
Please just answer the questions
1. Match the terms to the correct meaning:
a.
Conduction
b. Work
c. Thermal Equilibrium
d. Radiation
e. Power
f. Wind
g. Convection
h. Thermodynamics
i. Energy
j. Joules
____Heat transfer through electromagnetic waves.
____Thermal (heat) transfer by the contact (touching) of two objects.
____Transfers heat by moving currents in gases and liquids.
____ Uses energy and can create energy.
____The rate of doing work (faster work uses more of this).
____Has the ability to create forces; stored work.
____When two objects are at the same temperature.
____The units for energy and work.
____The study of how heat moves.
____Caused by convection currents in the earth’s atmosphere.
2. Heat is the transfer of energy from one place to another. It naturally occurs by one of three methods. Which one is not a natural heat transfer method?
POE Qtr. 2 Unit 2 Test – Energy & Thermodynamics
a.
b. Conduction
c. Convection
d. Radiation
e. Refrigeration
3. Select the INEXHAUSTABLE energy source.
a.
b. Coal
c. Biomass
d. Uranium
e. Wind
4. Radiation is the chief method of energy transfer,
a.
b. from the sun to an earth satellite.
c. from a gas flame to the top layer of water in a teakettle.
d. from a soldering iron to metals being soldered.
e. from the bottom of a glass of water to an ice cube floating in it.
5. Of the processes below, the one in which practically all the heat transfer is by conduction is:
a.
b. from the sun to an earth satellite.
c. from a gas flame to the top layer of water in a teakettle.
d. from a stovetop to a pot of water above it.
e. from the bottom of a glass of water to an ice cube floating in it.
6. Plastic handles are often used on kitchen utensils because…
a.
b. the plastic is a good radiator.
c. the plastic is a good insulator.
d. the plastic is a good conductor.
e. the plastic softens gradually with excessive heat.
7. Select the RENEWABLE energy source
a.
b. Coal
c. Natural Gas
d. Uranium
e. Biomass
8. 5. What is the definition of thermodynamics?
a.
b. The energy available to do work.
c. The study of the relationship between heat, work, and energy.
d. The amount of heat it takes to move an engine.
e. The movement of heat.
9. To increase the insulating qualities of a house, a homeowner should:
a.
b. Increase the R-value.
c. Increase the U-value.
d. Increase radiation.
e. Increase conduction.
10. The law stating that heat energy always goes toward entropy, or moves from hot to cold and from order to disorder, is known as:
a.
b. 1st law of thermodynamics
c. 2nd law of thermodynamics
d. Newton’s first law
e. Newton’s second law
2. Which of the following methods of heat transfer explains why air near the ceiling is warmer than the air near the floor in an enclosed room?
a.
b. Convection
c. Conduction
d. Radiation
e. R-value
11. Which of the following forms of energy is NOT a fossil fuel?
a.
b. Uranium
c. Natural Gas
d. Oil
e. Coal
12. Which statement is true about the First Law of Thermodynamics?
a.
b. It states that energy cannot be created.
c. It states that energy cannot be destroyed.
d. It is another name for the Law of Conservation of Energy.
e. All choices are correct.
13. What Kind of Thermal Transfer? (1. Conduction; 2. Convection; 3. Radiation)
____ When hot air rises.
____ When two objects are touching.
____ When nothing is touching.
____ When atoms collide.
____ Transfers heat in all directions.
____ Between a stove and a pot.
____ Within a pan of water.
____ More occurs with dark objects.
____ Through a car’s windows at night.
14. Is the person doing work? (Yes or No)
___ When pushing a 1000 N car 20 meters?
___ When lifting a rock off the ground?
___ When holding a book in their hands?
___ When pushing hard against a brick wall?
___ When walking up the stairs?
Math in Engineering
1. You move a 25 N object 5 meters. How much work did you do?
2. You carry a 20 N bag of dog food up a 6 m flight of stairs. How much work was done?
3. A 60watt light bulb runs for 5 seconds. How much energy does it use?
4. You use 35 J of energy to move a 7 N object. How far did you move it?
5. Answer the following question using the formulas learned in class. Remember the following:
· Make all necessary conversions
· Show ALL work – step by step format
· List all known values.
· List all unknown values.
· Select equations.
· Apply known values.
· Solve.
· Include units of measure for your final answer
A 1 kg piece of aluminum metal at 90 °C is placed in 5 liters (= 5 kg) of water at 35 °C. Determine the final temperature (Tf).
Specific Heat Water = 4180 J/KgC
Specific Heat Aluminum = 900 J/KgC