Can you please check my answers. My teacher gave me a list of 200 questions to study, but I lost the answer sheet. Can you please help me with these 23 Thanks
1. A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of the bar after the temperature change? A. 0.124764 meter B. 0.00023635 meter
C. 0.00002363 meter D. 0.0000189 meter
2. When the molecules in a body move with increased speed, it's possible that the body will change from a
A. gas to a liquid.
B. gas to a solid.
C. liquid to a solid liquid to a gas.
3. If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is
A. 273°C. B. 327°C. C. 705°C. D. 873°C.
4. The main purpose of the turbine in the turbojet engine is to
A. drive the compressor.
B. compress the air.
C. increase the velocity of the exhaust gases.
D. reduce the temperature of the exhaust gas.
5. 20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What is the new volume of the gas? (Assume that there's no change in temperature.)
A. 5 cubic inches B. 10 cubic inches
C. 40 cubic inches D. 100 cubic inches
6. Unlike other kinds of liquids, volatile liquids
A. ignite readily at a relatively low temperature.
B. flow rapidly at a relatively low temperature.
C. evaporate rapidly at a relatively low temperature.
D. freeze readily at a relatively high temperature.
7. A temperature of 273 K is the temperature at which water
A. boils.
B. lacks any moving molecules.
C. evaporates.
D. freezes.
8. Which of the following takes place in the combustion chamber of a gas turbine engine?
A. Fuel oil is stored with sufficient pressure.
B. Fuel oil is mixed with a proper portion of compressed air.
C. A mixture of fuel oil and compressed air is ignited.
D. Gases are cooled to a desired temperature.
9. How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C?
A. 314 J B. 6,573 J C.1,314,718 J D. 4,187,000 J
10. One degree Celsius indicates the same temperature change as
A. one degree Fahrenheit.
B. one kelvin.
C. 5/9 degree Fahrenheit.
D. 9/5 kelvin.
11. A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there's no change in volume.)
A.1.702 kPa B.3.636 kPa C. 510 kPa D. 854.46 kPa
12. A temperature of 20°C is equivalent to approximately
A. -6°F.
B. 32°F.
C. 68°F.
D. 136°F.
13. If the absolute pressure of a gas is 550.280 kPa, its gage pressure is
A. 101.325 kPa.
B. 277.280 kPa.
C. 448.955 kPa.
D. 651.605 kPa.
14. Which one of the following substances is a liquid fuel used in rocket engines?
a. Liquid oxygen
B. Ammonia
C. Potassium perchlorate
D. Codium nitrate
15. The density of water is the greatest at a temperature of
A. 0 K.
B. 4 K.
C. 273 K.
D. 277 K.
16. In a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the
A. piston.
B. cylinder.
C. combustion chamber.
D. intake valve.
11. A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there's no change in volume.)
A.1.702 kPa B.3.636 kPa C. 510 kPa D. 854.46 kPa
12. A temperature of 20°C is equivalent to approximately
A. -6°F.
B. 32°F.
C. 68°F.
D. 136°F.
13. If the absolute pressure of a gas is 550.280 kPa, its gage pressure is
A. 101.325 kPa.
B. 277.280 kPa.
C. 448.955 kPa.
D. 651.605 kPa.
14. Which one of the following substances is a liquid fuel used in rocket engines?
a. Liquid oxygen
B. Ammonia
C. Potassium perchlorate
D. Codium nitrate
15. The density of water is the greatest at a temperature of
A. 0 K.
B. 4 K.
C. 273 K.
D. 277 K.
16. In a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the
A. piston.
B. cylinder.
C. combustion chamber.
D. intake valve.
17. How much heat is required to convert 0.3 kilogram of ice at 0°C to water at the same temperature?
A. 100,375 J
B. 167,292 J
C. 334,584 J
D. 450,759 J
18. Which of the following cools the air in a household refrigerator?
A. Reduction of the air temperature due to condensation of the gaseous refrigerant
B. The transfer of heat from the air to the compressor due to expansion of the gaseous refrigerant
C. The transfer of heat to the evaporator due to compression of the liquid refrigerant
D. Absorption of the heat from the air due to evaporation of the liquid refrigerant
19. Which one of the following temperatures is equal to 5°C?
A. 0 K
B. 41 K
C. 278 K
D. 465 K
20. Liquid alcohol will change to vapor when its temperature reaches the
A. boiling point.
B. fusing point.
C. freezing point.
D. melting point.
21. A temperature of 200°F is equivalent to approximately
A. 37.8°C.
B. 93.3°C.
C. 232°C.
D. 840°C.
22. A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees kelvin. When the temperature of the gas is raised to 533 degrees kelvin, what is the new volume of the gas? (Assume that there's no change in pressure.)
A. 0.0006 m3
B. 0.2146 m3
C. 0.2333 m3
D. 0.3198 m3
23 What is the length of an aluminum rod at 65°C if its length at 15°C is 1.2 meters?
A. 0.001386 meter
B. 0.00180 meter
c 1.201386 meters
D. 1.214855 meters
Bull it's a Penn Foster exam cheater
I think it is unlikely that anyone will work all 23 for you. If you have answers to these from your work and you wish to post them, I'm sure someone here will check to see if the answer is correct. It would help if you showed your work. For #2, molecules moving faster must mean energy has been added. What happens when you add energy to a solid or a liquid? For #3, K = C + 273.
no i will not make out with you!
Sure, I can help you check your answers. Let's go through each question one by one.
1. To find the length of the bar after the temperature change, we can use the linear expansion formula: ΔL = L * α * ΔT, where ΔL is the change in length, L is the original length, α is the linear expansion coefficient, and ΔT is the change in temperature. The linear expansion coefficient for silver is approximately 0.0000189 per degree Celsius. Plugging in the values, we get ΔL = 0.125 * 0.0000189 * (200 - 100) = 0.00011875 meter. To find the final length, we subtract the change in length from the original length: 0.125 - 0.00011875 = 0.12488125 meter. None of the given options match this value, so none of the options are correct.
2. When the molecules in a body move with increased speed, the body will change from a gas to a liquid. So the correct answer is A. gas to a liquid.
3. To convert from absolute temperature (Kelvin) to degrees Celsius, we subtract 273 from the given temperature. So for a temperature of 600 K, the temperature in degrees Celsius is 600 - 273 = 327°C. The correct answer is B. 327°C.
4. The main purpose of the turbine in a turbojet engine is to drive the compressor. So the correct answer is A. drive the compressor.
5. According to Boyle's Law, for a fixed amount of gas at a constant temperature, the pressure and volume are inversely proportional. Therefore, we can use the equation P1 * V1 = P2 * V2, where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume. Plugging in the values, we get 5 * 20 = 10 * V2. Solving for V2, we get V2 = (5 * 20) / 10 = 10 cubic inches. The correct answer is B. 10 cubic inches.
6. Volatile liquids evaporate rapidly at a relatively low temperature. So the correct answer is C. evaporate rapidly at a relatively low temperature.
7. A temperature of 273 K is the temperature at which water freezes. So the correct answer is D. freezes.
8. The main purpose of the combustion chamber in a gas turbine engine is to ignite a mixture of fuel oil and compressed air. So the correct answer is C. A mixture of fuel oil and compressed air is ignited.
9. To calculate the heat energy required to raise the temperature of an object, we can use the formula Q = m * c * ΔT, where Q is the heat energy, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature. The specific heat capacity of coal is approximately 836 J/kg°C. Plugging in the values, we get Q = 5 * 836 * (220 - 20) = 5 * 836 * 200 = 836,000 J = 836 kJ. None of the given options match this value, so none of the options are correct.
10. One degree Celsius is equal to one Kelvin. So the correct answer is B. one kelvin.
11. To solve this question, we can use Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its absolute temperature when the volume is kept constant. Using the equation P1/T1 = P2/T2, where P1 is the initial pressure, T1 is the initial temperature, P2 is the final pressure, and T2 is the final temperature, we can solve for P2. Plugging in the values, we get P2 = (400 * 235) / 110 = 854.46 kPa. So the correct answer is D. 854.46 kPa.
12. To convert from Celsius to Fahrenheit, we can use the formula F = (9/5) * C + 32, where F is the temperature in Fahrenheit and C is the temperature in Celsius. Plugging in the value, we get F = (9/5) * 20 + 32 = 36 + 32 = 68°F. So the correct answer is C. 68°F.
13. The gage pressure of a gas is the difference between the absolute pressure and atmospheric pressure. So to find the gage pressure, we subtract the atmospheric pressure from the absolute pressure. However, the atmospheric pressure is not given in the question. Therefore, we cannot determine the correct answer without that information.
14. Liquid oxygen is a liquid fuel used in rocket engines. So the correct answer is a. Liquid oxygen.
15. The density of water is the greatest at a temperature of 4°C. So the correct answer is B. 4 K.
16. In a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the combustion chamber. So the correct answer is C. combustion chamber.
17. To calculate the heat required to convert from solid (ice) to liquid (water) at the same temperature, we can use the formula Q = m * L, where Q is the heat energy, m is the mass of the substance, and L is the latent heat of fusion. The latent heat of fusion for ice is approximately 334,000 J/kg. Plugging in the values, we get Q = 0.3 * 334,000 = 100,200 J. None of the given options match this value, so none of the options are correct.
18. The air in a household refrigerator is cooled by the reduction of temperature due to condensation of the gaseous refrigerant. So the correct answer is A. Reduction of the air temperature due to condensation of the gaseous refrigerant.
19. To convert from Celsius to Kelvin, we add 273 to the given temperature. So for a temperature of 5°C, the temperature in Kelvin is 5 + 273 = 278 K. So the correct answer is C. 278 K.
20. Liquid alcohol will change to vapor when its temperature reaches the boiling point. So the correct answer is A. boiling point.
21. To convert from Fahrenheit to Celsius, we can use the formula C = (F - 32) * 5/9, where C is the temperature in Celsius and F is the temperature in Fahrenheit. Plugging in the value, we get C = (200 - 32) * 5/9 = 168 * 5/9 = 93.33°C. So the correct answer is B. 93.3°C.
22. To solve this question, we can use Charles's Law, which states that the volume of a gas is directly proportional to its absolute temperature when the pressure is kept constant. Using the equation V1/T1 = V2/T2, where V1 is the initial volume, T1 is the initial temperature, V2 is the final volume, and T2 is the final temperature, we can solve for V2. Plugging in the values, we get V2 = (0.20 * 533) / 333 = 0.3198 m3. So the correct answer is D. 0.3198 m3.
23. To find the length of the aluminum rod at 65°C, we can use the linear expansion formula: ΔL = L * α * ΔT, where ΔL is the change in length, L is the original length, α is the linear expansion coefficient, and ΔT is the change in temperature. The linear expansion coefficient for aluminum is approximately 0.000022 per degree Celsius. Plugging in the values, we get ΔL = 1.2 * 0.000022 * (65 - 15) = 0.001386 meter. To find the final length, we add the change in length to the original length: 1.2 + 0.001386 = 1.201386 meters. So the correct answer is C. 1.201386 meters.
I hope this helps! Let me know if you have any other questions.