just write the last answer

1. A 0.30 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J/g^oC, what Is the change of the copper's temperature? ...........................

2. A 2 kilogram block of metal with a specific heat of 100 joules per kilogram*Kelvin falls from rest through a distance of 100 meters to the Earth's surface. If half of the potential energy lost by the fallen block is converted to internal energy of the block, the temperature change of the block is most nearly

• 1 K
• 5 K
• 10 K
• 25 K
• 45 K

3. A person uses 503.3 kcal of energy to run a race. Convert the energy used for the race to the following energy units: ................Calories .................calories .................Food Calories ................Joules .................. Kilojoules

4.A burner is heating up a pot at a rate of Q = 55 calories per second. How long will it take for the burner to give the pot 3890 calories of heat?

t .........= ......... unit

5.From the options below select the three ways that heat is transferred.

• Radiation
• Refraction
• Convection
• Diffraction
• Resistance
• Coulomb's Law
• Conduction

6.Two jars of liquid have different temperatures, 77.9 C and 21.8 C. They are connected by a rod, which is insulated so that it only transfers heat between the jars. The rod is 5 cm long with a radius of 1.1 cm. In 10 seconds, 2,400 J of heat is conducted from one jar to the other. Find the thermal conductivity of the rod.

kk = .............. J/(s*g*C)

7. Which of the following units are used to measure heat? Select all that apply.

• Celsius
• calories
• Joules
• kilocalories
• Kelvin
• Fahrenheit

8.Calculate the change in temperature when 30.8 kg of metal gains 245,000 J of energy. The specific heat capacity of the metal is 309 J/kgC.

T = ............. unit. ...........Select an answer K F C

9.Why does a metal feel colder than rubber?

• Rubber doesn't absorb cold
• Metal has a very high specific heat capacity
• Rubber has indefinite thermal expansivity
• Metal conducts heat away from your hand more quickly than rubber

10.Iron has a Latent Heat of Fusion of 63.7 calories/gram. What mass of iron can you melt with 720 calories of heat?

m ..............= ..............unit

11.Match the following examples to their category of heat transfer

• -The Sun heats the Earth.
• - You burn yourself touching a hot stove.
• - A hot piece of metal stuck in ice eventually cools down.
• - Warm water is pumped into the bottom of a swimming pool.
• - You sit near a fire and feel its warmth.

1. Convection
2. Conduction
3. Radiation

12.You are driving West at 29 m/s. Ahead of you is an ambulance traveling East (towards you) at 36 m/s. You hear the ambulance siren at a frequency of 498 Hz. What is the actual frequency that the ambulance is emitting? Use 344m/s for the speed of sound in air. Round your answer to 2 decimal places. Frequency= .................Hz