Question 1

What form of convection causes the onshore sea breeze in the day?

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 land 
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 land

Question 2

The heat of fusion for ice at 0$^{\circ}$C is 333.7 kJ/kg.What is the energy needed to melt 100 grams of ice at 0.00$^{\circ}$C?

Accepted Answer

A)  39.4 kJ 
B)  12.7 kJ 
C)  17.5 kJ 
D)  25.5 kJ 
E)  33.4 kJ 
A)  39.4 kJ 
B)  12.7 kJ 
C)  17.5 kJ 
D)  25.5 kJ 
E)  33.4 kJ

Question 3

The solar energy coming to the earth by radiation is 1,340 W/m2.If the sun has a radius of 7.000 $\times$ 108m,is a perfect radiator and is located 1.500 $\times$ 1011m from the earth,then what is the temperature of the sun?

Accepted Answer

A)  6430 K 
B)  5760 K 
C)  4230 K 
D)  3670 K 
E)  3210 K 
A)  6430 K 
B)  5760 K 
C)  4230 K 
D)  3670 K 
E)  3210 K

Question 4

A circular window in the wall of a home has a diameter of 25 cm and is made of a single pane of glass 0.30 cm thick.Thermal conductivity for the glass is 0.63 W/mK.If 1.6 kJ is lost through the window in 12 s,and if inside the house the temperature is 20$^{\circ}$C,what is the outside temperature?

Accepted Answer

A)  -12$^{\circ}$C 
B)  18$^{\circ}$C 
C)  10$^{\circ}$C 
D)  17$^{\circ}$C 
E)  -17$^{\circ}$C 
A)  -12$^{\circ}$C 
B)  18$^{\circ}$C 
C)  10$^{\circ}$C 
D)  17$^{\circ}$C 
E)  -17$^{\circ}$C

Question 5

A heating element inside a rigid plastic box in the form of a cube,0.15 m on a side,is used to heat its contents,a volume of nitrogen gas (N2),which begins at standard temperature (0$^{\circ}$C)and pressure (1 atm).If the heat input to the box is 185 J,what is the final temperature of the gas?

Accepted Answer

A)  69$^{\circ}$C 
B)  88$^{\circ}$C 
C)  150$^{\circ}$C 
D)  50$^{\circ}$C 
E)  59$^{\circ}$C 
A)  69$^{\circ}$C 
B)  88$^{\circ}$C 
C)  150$^{\circ}$C 
D)  50$^{\circ}$C 
E)  59$^{\circ}$C

Question 6

A circular window in the wall of a home has a diameter of 25 cm and is made of a single pane of glass 0.30 cm thick.Thermal conductivity for the glass is 0.63 W/mK.What heat is lost through the window in 12s if the temperature inside the house is 20$^{\circ}$C and outside is -12$^{\circ}$C?

Accepted Answer

A)  16 kJ 
B)  4.0 kJ 
C)  1.6 kJ 
D)  1.3 kJ 
E)  5.0 kJ 
A)  16 kJ 
B)  4.0 kJ 
C)  1.6 kJ 
D)  1.3 kJ 
E)  5.0 kJ

Question 7

A concrete wall is 15.0 cm thick and has an area of 10.0 m2.A layer of wood that is 2.50 cm thick is placed over the wall to reduce the loss of heat by thermal conduction.The coefficient thermal conductivity of concrete is 1.70 W/m $^{\circ}$C and the coefficient of thermal conductivity of wood is 0.0400 W/m $^{\circ}$C.What is the effective coefficient of thermal conductivity of the wood on concrete system?

Accepted Answer

A)  0.245 W/m$^{\circ}$C 
B)  1.22 W/m$^{\circ}$C 
C)  1.65 W/m$^{\circ}$C 
D)  2.02 W/m$^{\circ}$C 
E)  2.34 W/m$^{\circ}$C 
A)  0.245 W/m$^{\circ}$C 
B)  1.22 W/m$^{\circ}$C 
C)  1.65 W/m$^{\circ}$C 
D)  2.02 W/m$^{\circ}$C 
E)  2.34 W/m$^{\circ}$C

Question 8

A food calorie is a kilocalorie in SI units.What would be the speed of a 1000 kg car traveling such that its kinetic energy is equal to the energy contained in one 250-calorie jelly doughnut?

Accepted Answer

A)  46 m/s 
B)  65 m/s 
C)  32 m/s 
D)  22 m/s 
A)  46 m/s 
B)  65 m/s 
C)  32 m/s 
D)  22 m/s

Question 9

Which type of heat transfer is used in most automobile engines to carry excess heat away from the hot engine?

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 land 
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 land

Question 10

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,the heat of vaporization of water at 100$^{\circ}$C is 2,256 kJ/kg,and the specific heat of steam is 2.020 kJ/kg $^{\circ}$C.What is the final equilibrium temperature when 40.0 grams of ice at 0$^{\circ}$C is mixed with 8.00 grams of steam at 120$^{\circ}$C?

Accepted Answer

A)  50.22$^{\circ}$C 
B)  41.67$^{\circ}$C 
C)  38.76$^{\circ}$C 
D)  32.55$^{\circ}$C 
E)  25.67$^{\circ}$C 
A)  50.22$^{\circ}$C 
B)  41.67$^{\circ}$C 
C)  38.76$^{\circ}$C 
D)  32.55$^{\circ}$C 
E)  25.67$^{\circ}$C

Question 11

The solar energy coming to the earth by radiation is 1340 W/m2 when the temperature of the Sun is 5800 K.If the temperature of the Sun increased by 10.00%,then what would be the amount of solar radiation coming to the earth?

Accepted Answer

A)  1492 W/m2 
B)  1632 W/m2 
C)  1828 W/m2 
D)  1962 W/m2 
E)  2004 W/m2 
A)  1492 W/m2 
B)  1632 W/m2 
C)  1828 W/m2 
D)  1962 W/m2 
E)  2004 W/m2

Question 12

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.What is the temperature outside?

Accepted Answer

A)  -3$^{\circ}$C 
B)  -16$^{\circ}$C 
C)  16$^{\circ}$C 
D)  11$^{\circ}$C 
A)  -3$^{\circ}$C 
B)  -16$^{\circ}$C 
C)  16$^{\circ}$C 
D)  11$^{\circ}$C

Question 13

Water falls a distance of 50.0 meters.The specific heat of water is 1.00 cal/gm$^{\circ}$C.What is the increase in temperature of the water after the fall,in$^{\circ}$C?

Accepted Answer

A)  0.12 
B)  1.03 
C)  2.65 
D)  5.33 
E)  7.50 
A)  0.12 
B)  1.03 
C)  2.65 
D)  5.33 
E)  7.50

Question 14

A 50.0 g glass container contains 200 g of water at 20.0$^{\circ}$C.A 20.0 g piece of an alloy at 100$^{\circ}$C is added to the water in the container.The final temperature of the mixture is 24$^{\circ}$C.What is the specific heat of the alloy in cal/gm$^{\circ}$C? (specific heat of water = 1.00 cal/gm$^{\circ}$C,specific heat of glass = 0.200 cal/gm$^{\circ}$C)

Accepted Answer

A)  2.75 
B)  1.87 
C)  1.54 
D)  0.852 
E)  0.553 
A)  2.75 
B)  1.87 
C)  1.54 
D)  0.852 
E)  0.553

Question 15

Radiant energy from the Sun reaches the Earth at a rate of 1.70 $\times$ 1017 W.When 30% of the radiant energy is reflected and 70% absorbed,the average temperature of the Earth's atmosphere is 253 K or -20$^{\circ}$C.If the atmosphere absorbed 100% of the solar radiant energy,then what is the average temperature of the Earth's atmosphere?

Accepted Answer

A)  2.5$^{\circ}$C 
B)  2.8$^{\circ}$C 
C)  3.0$^{\circ}$C 
D)  3.6$^{\circ}$C 
E)  4.6$^{\circ}$C 
A)  2.5$^{\circ}$C 
B)  2.8$^{\circ}$C 
C)  3.0$^{\circ}$C 
D)  3.6$^{\circ}$C 
E)  4.6$^{\circ}$C

Question 16

A brass rod with a length of 30.0 cm is placed side by side with an aluminum rod with a length of 30.0 cm and this system is placed between a hot temperature of 100$^{\circ}$C and a cold temperature of 10.0$^{\circ}$C.The coefficient of thermal conductivities of the brass and the aluminum are 100 W/m$^{\circ}$C and 230 W/m $^{\circ}$C respectively.The brass rod has a cross sectional area of 20.0 cm2 and the aluminum rod has a cross sectional area of 30.0 cm2.What is the heat flow from the hot temperature to the cold temperature?

Accepted Answer

A)  542 W 
B)  26.7 W 
C)  54.2W 
D)  267 W 
A)  542 W 
B)  26.7 W 
C)  54.2W 
D)  267 W

Question 17

A metal rod is placed between two temperature sources so that heat can flow between them.One temperature is 90.0$^{\circ}$C and the other temperature is 25.0$^{\circ}$C.The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2.If 15.0 watts of heat flows between the hot temperature and the cold temperature,then what is the coefficient of thermal conductivity for the metal?

Accepted Answer

A)  69.2 W/m$ \bullet $$^{\circ}$C 
B)  58.2 W/m$ \bullet $$^{\circ}$C 
C)  50.4 W/m$ \bullet $$^{\circ}$C 
D)  46.3 W/m$ \bullet $$^{\circ}$C 
E)  44.2 W/m$ \bullet $$^{\circ}$C 
A)  69.2 W/m$ \bullet $$^{\circ}$C 
B)  58.2 W/m$ \bullet $$^{\circ}$C 
C)  50.4 W/m$ \bullet $$^{\circ}$C 
D)  46.3 W/m$ \bullet $$^{\circ}$C 
E)  44.2 W/m$ \bullet $$^{\circ}$C

Question 18

The specific heat of water is 1.000 cal/gm $^{\circ}$C.What is the specific heat of water in the mks system of units?

Accepted Answer

A)  2,124 J/kg$^{\circ}$C 
B)  2,765 J/kg$^{\circ}$C 
C)  3,417 J/kg$^{\circ}$C 
D)  3,764 J/kg$^{\circ}$C 
E)  4,186 J/kg$^{\circ}$C 
A)  2,124 J/kg$^{\circ}$C 
B)  2,765 J/kg$^{\circ}$C 
C)  3,417 J/kg$^{\circ}$C 
D)  3,764 J/kg$^{\circ}$C 
E)  4,186 J/kg$^{\circ}$C

Question 19

What is the total internal energy of 2.00 moles of an ideal gas at 100 K?

Accepted Answer

A)  3,670 J 
B)  3,250 J 
C)  2,750 J 
D)  2,490 J 
E)  1,950 J 
A)  3,670 J 
B)  3,250 J 
C)  2,750 J 
D)  2,490 J 
E)  1,950 J

Question 20

A brass plate with a thickness of 1.00 cm is placed over a copper plate with a thickness of 2.00 cm.The coefficient of thermal conductivity of brass is 100 W/m$^{\circ}$C and of copper is 400 W/m $^{\circ}$C.What is the effective coefficient of thermal conductivity for the brass-copper layer?

Accepted Answer

A)  150 W/m$^{\circ}$C 
B)  200 W/m$^{\circ}$C 
C)  250 W/m$^{\circ}$C 
D)  300 W/m$^{\circ}$C 
E)  350 W/m$^{\circ}$C 
A)  150 W/m$^{\circ}$C 
B)  200 W/m$^{\circ}$C 
C)  250 W/m$^{\circ}$C 
D)  300 W/m$^{\circ}$C 
E)  350 W/m$^{\circ}$C

Exam 14: Heat

What form of convection causes the onshore sea breeze in the day?

The heat of fusion for ice at 0 ∘^{\circ}∘ C is 333.7 kJ/kg.What is the energy needed to melt 100 grams of ice at 0.00 ∘^{\circ}∘ C?

The solar energy coming to the earth by radiation is 1,340 W/m2.If the sun has a radius of 7.000 ×\times× 108m,is a perfect radiator and is located 1.500 ×\times× 1011m from the earth,then what is the temperature of the sun?

A food calorie is a kilocalorie in SI units.What would be the speed of a 1000 kg car traveling such that its kinetic energy is equal to the energy contained in one 250-calorie jelly doughnut?

Which type of heat transfer is used in most automobile engines to carry excess heat away from the hot engine?

The solar energy coming to the earth by radiation is 1340 W/m2 when the temperature of the Sun is 5800 K.If the temperature of the Sun increased by 10.00%,then what would be the amount of solar radiation coming to the earth?

Water falls a distance of 50.0 meters.The specific heat of water is 1.00 cal/gm ∘^{\circ}∘ C.What is the increase in temperature of the water after the fall,in ∘^{\circ}∘ C?

The specific heat of water is 1.000 cal/gm ∘^{\circ}∘ C.What is the specific heat of water in the mks system of units?

What is the total internal energy of 2.00 moles of an ideal gas at 100 K?

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

The heat of fusion for ice at 0 $^{\circ}$ C is 333.7 kJ/kg.What is the energy needed to melt 100 grams of ice at 0.00 $^{\circ}$ C?

The solar energy coming to the earth by radiation is 1,340 W/m².If the sun has a radius of 7.000 $\times$ 10⁸m,is a perfect radiator and is located 1.500 $\times$ 10¹¹m from the earth,then what is the temperature of the sun?

The solar energy coming to the earth by radiation is 1340 W/m² when the temperature of the Sun is 5800 K.If the temperature of the Sun increased by 10.00%,then what would be the amount of solar radiation coming to the earth?

Water falls a distance of 50.0 meters.The specific heat of water is 1.00 cal/gm $^{\circ}$ C.What is the increase in temperature of the water after the fall,in $^{\circ}$ C?

The specific heat of water is 1.000 cal/gm $^{\circ}$ C.What is the specific heat of water in the mks system of units?