Exam 14: Temperature and Heat

A 0.0030-kg lead bullet is traveling at a speed of 300 m/s when it embeds in a block of ice at 0 $\degree$ C. If all the heat generated goes into melting ice, what quantity of ice is melted? (L_f = 80 kcal/kg, the specific heat of lead = 0.03 kcal/kg· $\degree$ C, and 1 kcal = 4186 J)

A pipe of length 10.0 m increases in length by 2.0 cm when its temperature is increased by 90 $\degree$ F. What is its coefficient of linear expansion?

What happens to a given mass of water as it is cooled from 4 $\degree$ C to zero?

A temperature change from 15 $\degree$ C to 45 $\degree$ C corresponds to what incremental change in $\degree$ F?

A metal bar is used to conduct heat. When the temperature at one end is 100 $\degree$ C and at the other is 20 $\degree$ C, heat is transferred at a rate of 16 J/s. If the temperature of the hotter end is reduced to 60 $\degree$ C, what will be the rate of heat transfer?

An automobile gas tank is filled to its capacity of 20.00 gallons with the gasoline at an initial temperature of 10 $\degree$ C. The automobile is parked in the Sun causing the gasoline's temperature to rise to 60 $\degree$ C. If the coefficient of volume expansion for gasoline is 9.6 *10^-4/ $\degree$ C, what volume runs out the overflow tube? Assume the change in volume of the tank is negligible.

If one's hands are being warmed by holding them to one side of a flame, the predominant form of heat transfer is what process?

Arrange the temperatures , , and from highest to lowest.

The tungsten filament of a light bulb has an operating temperature of about 2100 K. If the emitting area of the filament is 0.80 cm², and its emissivity is 0.68, what is the power output of the light bulb? ( $\sigma$ = 5.67 *10^-8 W/m² ·K⁴)

An inventor develops a stationary cycling device by which an individual, while pedaling, can convert all of the energy expended into heat for warming water. How much mechanical energy is required to increase the temperature of 300 g of water (enough for 1 cup of coffee) from 30 $\degree$ C to 90 $\degree$ C? (1 cal = 4.186 J, the specific heat of water is 4186 J/kg · $\degree$ C)

A 6-g lead bullet traveling in 20 $\degree$ C air at 300 m/s strikes a flat steel plate and stops. What is the final temperature of the lead bullet? (Assume the bullet retains all heat.) The melting point of lead is 327 $\degree$ C. The specific heat of lead is 0.128 J/g· $\degree$ C. The heat of fusion of lead is 24.5 J/g.

What is the temperature increase of 3.0 kg of water when heated by an 800-W immersion heater for 10 min? (c_w = 4186 J/kg · $\degree$ C)

The surfaces of a Dewar flask are silvered for the purpose of minimizing heat transfer by what process?

What happens to a volume of water when its temperature is reduced from 8 $\degree$ C to 4 $\degree$ C?

A piece of copper of mass 100 g is being drilled through with a ¹/₂" electric drill. The drill operates at 50.0 W and takes 30.0 s to bore through the copper. If all the energy from the drill heats the copper, find the copper's increase in temperature. (c_copper = 387 J/kg · $\degree$ C.)

What is the temperature of a system in thermal equilibrium with another system made up of ice and water at one atmosphere of pressure?

A slice of bread contains about 90 kcal. If specific heat of a person were 1.00 kcal/kg· $\degree$ C, by how many $\degree$ C would the temperature of a 70.0-kg person increase if all the energy in the bread were converted to heat?

What temperature increase is necessary to increase the power radiated from an object by a factor of 16?

A metal bar is used to conduct heat. When the temperature at one end is 100 $\degree$ C and at the other is 20 $\degree$ C, heat is transferred at a rate of 32 J/s. The bar is then stretched uniformly to twice its original length. If again it has ends at 100 $\degree$ C and 20 $\degree$ C, at what rate will heat be transferred between it ends?

Two windowpanes are being compared for their heat conduction. The second windowpane has twice the width, twice the height, and twice the thickness of glass of the first windowpane.How would the heat flow through the second windowpane compare to that of the first.