Question 1

The molar specific heat of a diatomic ideal gas at constant volume is Cv = 5/2 R.What is the heat needed to heat 28.00 g of air from 20.00 ∘^{\circ}∘ C to 85.00 ∘^{\circ}∘ C?

Accepted Answer

A)   1,350 J
B)   2,890 J
C)   1,753 J
D)   1,540 J
E)   1,443 J F) A) and B)
G) C) and D)

Question 2

The solar energy coming to the earth by radiation is 1,340 W/m2 when the temperature of the Sun is 5800 K.If the temperature of the Sun decreased by 10.0%,then what would be the amount of solar radiation coming to the earth?

Accepted Answer

A)   879 W/m2
B)   752 W/m2
C)   667 W/m2
D)   610 W/m2
E)   578 W/m2F) C) and E)
G) A) and B)

Question 3

What type of heat transfer is used to carry heat from the house furnace to the living room of most houses?

Accepted Answer

A)   natural convection of air falling over the cooling land
B)   forced convection air or force convection of water
C)   forced convection of water
D)   natural convection of air rising over the warming landE) A) and D)
F) A) and C)

Question 4

A 2000 kg car is traveling at 20.0 m/s and then puts on the brakes and comes to a complete stop.The heat generated at the brakes due to stopping heats up the brakes.The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg ∘^{\circ}∘ C.What is the increase in the temperature of the brakes?

Accepted Answer

A)   75.3 ∘^{\circ}∘ C
B)   53.1 ∘^{\circ}∘ C
C)   23.9 ∘^{\circ}∘ C
D)   18.9 ∘^{\circ}∘ C
E)   12.4 ∘^{\circ}∘ C F) A) and C)
G) A) and B)

Question 5

What is the heat needed to heat 150 g of water from 10.0 ∘^{\circ}∘ C to 100 ∘^{\circ}∘ C? (specific heat of water = 4186 J/kg  ∘^{\circ}∘ C)

Accepted Answer

A)   37.2 kJ
B)   44.6 kJ
C)   56.5 kJ
D)   68.2 kJ
E)   75.1 kJ F) A) and E)
G) D) and E)

Question 6

What is the heat needed to heat 16.0 grams of helium gas at constant volume from 20.0 ∘^{\circ}∘ C to 85.0 ∘^{\circ}∘ C?

Accepted Answer

A)   4.23 kJ
B)   3.24 kJ
C)   2.02 kJ
D)   1.95 kJ
E)   0.650 kJ F) A) and D)
G) A) and E)

Question 7

A 2000 kg car is traveling at 20.0 m/s down a long mountain grade of 1.00%.The mountain road is 3.00 km long.The heat generated at the brakes due to friction heats up the brakes.The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg ∘^{\circ}∘ C.What is the increase in the temperature of the brakes?

Accepted Answer

A)   22.3 ∘^{\circ}∘ C
B)   35.1 ∘^{\circ}∘ C
C)   40.2 ∘^{\circ}∘ C
D)   45.2 ∘^{\circ}∘ C
E)   53.6 ∘^{\circ}∘ C F) All of the above
G) A) and B)

Question 8

A 100 gram glass container contains 200 grams of water and 50.0 grams of ice all at 0 ∘^{\circ}∘ C.A 200 gram piece of lead at 100 ∘^{\circ}∘ C is added to the water and ice in the container.What is the final temperature of the system? (specific heat of ice = 2,000 J/kg ∘^{\circ}∘ C ,specific heat of water = 4,186 J/kg ∘^{\circ}∘ C,heat of fusion of water = 333.7 kJ/kg,specific heat of glass = 837.2 J/km ∘^{\circ}∘ C,specific heat of lead = 127.7 J/km ∘^{\circ}∘ C)

Accepted Answer

A)   5.33 ∘^{\circ}∘ C
B)   4.87 ∘^{\circ}∘ C
C)   3.65 ∘^{\circ}∘ C
D)   2.19 ∘^{\circ}∘ C
E)   1.75 ∘^{\circ}∘ C F) B) and D)
G) C) and D)

Question 9

An exerciser of mass 90.0 kg walks up a flight of stairs that are 12.0 meter high.What is the energy of the exercise in Calories?

Accepted Answer

A)   8.55
B)   7.32
C)   4.66
D)   2.53
E)   1.85F) A) and E)
G) C) and D)

Question 10

A 100 g glass container contains 250 g of water at 15.0 ∘^{\circ}∘ C.A 100 g piece of unknown material at 100 ∘^{\circ}∘ C is added to the water in the container.The final temperature of the mixture is 19.0 ∘^{\circ}∘ C.What is the specific heat of the unknown material in J/kg  ∘^{\circ}∘ C? (specific heat of water = 4186 J/kg  ∘^{\circ}∘ C, specific heat of glass = 837.2 J/kg  ∘^{\circ}∘ C)

Accepted Answer

A)   245
B)   387
C)   412
D)   558
E)   674 F) A) and D)
G) B) and E)

Question 11

A 100 gram glass container contains 250 grams of water at 15.0 ∘^{\circ}∘ C.A 200 gram piece of lead at 100 ∘^{\circ}∘ C is added to the water in the container.What is the final temperature of the system? (specific heat of water = 4,186 J/kg  ∘^{\circ}∘ C,specific heat of glass = 837.2 J/km ∘^{\circ}∘ C,specific heat of lead = 127.7 J/km ∘^{\circ}∘ C)

Accepted Answer

A)   37 ∘^{\circ}∘ C
B)   31 ∘^{\circ}∘ C
C)   23 ∘^{\circ}∘ C
D)   17 ∘^{\circ}∘ C
E)   12 ∘^{\circ}∘ C F) B) and C)
G) B) and E)

Question 12

200 Joules of heat flows into a 35 g sample.If the temperature increases by 10 ∘^{\circ}∘ C,then what is the heat capacity of the sample,in J/  ∘^{\circ}∘ C?

Accepted Answer

A)   8.0
B)   12
C)   16
D)   20
E)   32 F) A) and B)
G) B) and D)

Question 13

The heat of fusion for lead at 327.0 ∘^{\circ}∘ C is 22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg ∘^{\circ}∘ C.What is the energy needed to melt 100 grams of lead starting at 0 ∘^{\circ}∘ C?

Accepted Answer

A)   3.56 kJ
B)   4.23 kJ
C)   6.54 kJ
D)   7.02 kJ
E)   7.76 kJ F) None of the above
G) C) and D)

Question 14

A 1500 W portable heater is needed to replace the heat lost through a circular window (radius 25 cm) in the wall of a home that is made of a single pane of glass 0.30 cm thick.Thermal conductivity for the glass is 0.63 W/mK.The temperature inside the house is 20 ∘^{\circ}∘ C and outside is -12 ∘^{\circ}∘ C.What is the thickness of the window?

Accepted Answer

A)   0.84 mm
B)   4.2 mm
C)   2.6 mm
D)   0.66 mm E) None of the above
F) All of the above

Question 15

The specific heat of ice is 2.100 kJ/kg  ∘^{\circ}∘ C,the heat of fusion for ice at 0 ∘^{\circ}∘ C is 333.7 kJ/kg,the specific heat of water 4.186 kJ/kg ∘^{\circ}∘ C,and the heat of vaporization of water at 100.0 ∘^{\circ}∘ C is 2,256 kJ/kg.What is the final equilibrium temperature when 10.00 grams of ice at -15 ∘^{\circ}∘ C is mixed with 3.000 grams of steam at 100 ∘^{\circ}∘ C?

Accepted Answer

A)   87.21 ∘^{\circ}∘ C
B)   85.32 ∘^{\circ}∘ C
C)   82.56 ∘^{\circ}∘ C
D)   80.12 ∘^{\circ}∘ C
E)   78.45 ∘^{\circ}∘ C F) A) and B)
G) B) and E)

Question 16

An exerciser lifts 10.00 N weights a vertical distance of 50.00 cm.How many times would the exerciser have to lift the weight to use 10.00 Calories of energy?

Accepted Answer

A)   7,503
B)   4,125
C)   5,170
D)   8,370
E)   9,670F) A) and B)
G) All of the above

Question 17

The heat of vaporization of water at 100.0 ∘^{\circ}∘ C is 2,256 kJ/kg.What is the heat of vaporization of water in cal/gm?

Accepted Answer

A)   365.3
B)   418.6
C)   497.2
D)   538.9
E)   684.1 F) B) and E)
G) C) and D)

Question 18

A 2000 kg car is traveling at 15.0 m/s down a long mountain grade of 2.0%.The mountain road is 5.0 km long.The heat generated at the brakes due to friction heats up the brakes.The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg ∘^{\circ}∘ C.What is the increase in the temperature of the brakes?

Accepted Answer

A)   43 ∘^{\circ}∘ C
B)   54 ∘^{\circ}∘ C
C)   83 ∘^{\circ}∘ C
D)   95 ∘^{\circ}∘ C
E)   117 ∘^{\circ}∘ C F) A) and D)
G) A) and C)

Question 19

The specific of ice is 2.10 kJ/kg  ∘^{\circ}∘ C,the heat of fusion for ice at 0 ∘^{\circ}∘ C is 333.7 kJ/kg,the specific heat of water 4.186 kJ/kg  ∘^{\circ}∘ C, and the heat of vaporization of water at 100 ∘^{\circ}∘ C is 2,256 kJ/kg.What is the final equilibrium temperature when 5.00 grams of ice at -15.0 ∘^{\circ}∘ C is mixed with 40.0 grams of water at 75.0 ∘^{\circ}∘ C?

Accepted Answer

A)   30.1 ∘^{\circ}∘ C
B)   28.3 ∘^{\circ}∘ C
C)   20.9 ∘^{\circ}∘ C
D)   18.6 ∘^{\circ}∘ C
E)   16.1 ∘^{\circ}∘ C F) C) and D)
G) B) and E)

Question 20

The specific heat of ice is 2.10 kJ/kg  ∘^{\circ}∘ C,the heat of fusion for ice at 0 ∘^{\circ}∘ C is 333.7 kJ/kg,the specific heat of water 4.186 kJ/kg ∘^{\circ}∘ C,and the heat of vaporization of water at 100 ∘^{\circ}∘ C is 2256 kJ/kg.What is the final equilibrium temperature when 20.0 grams of ice at 15.0 ∘^{\circ}∘ C is mixed with 5.00 grams of steam at 100 ∘^{\circ}∘ C?

Accepted Answer

A)   44.1 ∘^{\circ}∘ C
B)   48.9 ∘^{\circ}∘ C
C)   52.7 ∘^{\circ}∘ C
D)   58.0 ∘^{\circ}∘ C
E)   65.2 ∘^{\circ}∘ C F) None of the above
G) A) and B)

Exam 14: Heat

The heat of fusion for lead at 327.0 $^{\circ}$ C is 22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg $^{\circ}$ C.What is the energy needed to melt 100 grams of lead starting at 0 $^{\circ}$ C?

Correct Answer
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An exerciser lifts 10.00 N weights a vertical distance of 50.00 cm.How many times would the exerciser have to lift the weight to use 10.00 Calories of energy?

Correct Answer
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The heat of vaporization of water at 100.0 $^{\circ}$ C is 2,256 kJ/kg.What is the heat of vaporization of water in cal/gm?

Correct Answer
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What is the heat needed to heat 150 g of water from 10.0 $^{\circ}$ C to 100 $^{\circ}$ C? (specific heat of water = 4186 J/kg $^{\circ}$ C)

Correct Answer
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The solar energy coming to the earth by radiation is 1,340 W/m² when the temperature of the Sun is 5800 K.If the temperature of the Sun decreased by 10.0%,then what would be the amount of solar radiation coming to the earth?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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200 Joules of heat flows into a 35 g sample.If the temperature increases by 10 $^{\circ}$ C,then what is the heat capacity of the sample,in J/ $^{\circ}$ C?

Correct Answer
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Correct Answer
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Correct Answer
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An exerciser of mass 90.0 kg walks up a flight of stairs that are 12.0 meter high.What is the energy of the exercise in Calories?

Correct Answer
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What is the heat needed to heat 16.0 grams of helium gas at constant volume from 20.0 $^{\circ}$ C to 85.0 $^{\circ}$ C?

Correct Answer
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Correct Answer
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The molar specific heat of a diatomic ideal gas at constant volume is Cv = 5/2 R.What is the heat needed to heat 28.00 g of air from 20.00 $^{\circ}$ C to 85.00 $^{\circ}$ C?

Correct Answer
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Correct Answer
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Correct Answer
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What type of heat transfer is used to carry heat from the house furnace to the living room of most houses?

Correct Answer
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Correct Answer
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Exam 14: Heat

The heat of fusion for lead at 327.0 ∘^{\circ}∘ C is 22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg ∘^{\circ}∘ C.What is the energy needed to melt 100 grams of lead starting at 0 ∘^{\circ}∘ C?

Correct AnswerverifiedShow Answer

An exerciser lifts 10.00 N weights a vertical distance of 50.00 cm.How many times would the exerciser have to lift the weight to use 10.00 Calories of energy?

Correct AnswerverifiedShow Answer

The heat of vaporization of water at 100.0 ∘^{\circ}∘ C is 2,256 kJ/kg.What is the heat of vaporization of water in cal/gm?

Correct AnswerverifiedShow Answer

What is the heat needed to heat 150 g of water from 10.0 ∘^{\circ}∘ C to 100 ∘^{\circ}∘ C? (specific heat of water = 4186 J/kg ∘^{\circ}∘ C)

Correct AnswerverifiedShow Answer

The solar energy coming to the earth by radiation is 1,340 W/m2 when the temperature of the Sun is 5800 K.If the temperature of the Sun decreased by 10.0%,then what would be the amount of solar radiation coming to the earth?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

200 Joules of heat flows into a 35 g sample.If the temperature increases by 10 ∘^{\circ}∘ C,then what is the heat capacity of the sample,in J/ ∘^{\circ}∘ C?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An exerciser of mass 90.0 kg walks up a flight of stairs that are 12.0 meter high.What is the energy of the exercise in Calories?

Correct AnswerverifiedShow Answer

What is the heat needed to heat 16.0 grams of helium gas at constant volume from 20.0 ∘^{\circ}∘ C to 85.0 ∘^{\circ}∘ C?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The molar specific heat of a diatomic ideal gas at constant volume is Cv = 5/2 R.What is the heat needed to heat 28.00 g of air from 20.00 ∘^{\circ}∘ C to 85.00 ∘^{\circ}∘ C?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What type of heat transfer is used to carry heat from the house furnace to the living room of most houses?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The heat of fusion for lead at 327.0 $^{\circ}$ C is 22.9 kJ/kg and the specific heat of lead is 0.130 kJ/kg $^{\circ}$ C.What is the energy needed to melt 100 grams of lead starting at 0 $^{\circ}$ C?

Correct Answer
verified

Correct Answer
verified

The heat of vaporization of water at 100.0 $^{\circ}$ C is 2,256 kJ/kg.What is the heat of vaporization of water in cal/gm?

Correct Answer
verified

What is the heat needed to heat 150 g of water from 10.0 $^{\circ}$ C to 100 $^{\circ}$ C? (specific heat of water = 4186 J/kg $^{\circ}$ C)

Correct Answer
verified

The solar energy coming to the earth by radiation is 1,340 W/m² when the temperature of the Sun is 5800 K.If the temperature of the Sun decreased by 10.0%,then what would be the amount of solar radiation coming to the earth?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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200 Joules of heat flows into a 35 g sample.If the temperature increases by 10 $^{\circ}$ C,then what is the heat capacity of the sample,in J/ $^{\circ}$ C?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What is the heat needed to heat 16.0 grams of helium gas at constant volume from 20.0 $^{\circ}$ C to 85.0 $^{\circ}$ C?

Correct Answer
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Correct Answer
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The molar specific heat of a diatomic ideal gas at constant volume is Cv = 5/2 R.What is the heat needed to heat 28.00 g of air from 20.00 $^{\circ}$ C to 85.00 $^{\circ}$ C?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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