20. Heat and Temperature

Specific Heat & Temperature Changes

20. Heat and Temperature

# Specific Heat & Temperature Changes - Video Tutorials & Practice Problems

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### Specific Heat & Temperature Changes

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Problem

ProblemYou are given a sample of an unknown metal. You weigh the sample and find that its weight is 29.4N. You add 1.25×10^{4} J of heat energy to the sample and find that its temperature increases from 52°C to 70°C. What is the specific heat of this unknown metal?

A

23.6 J/(kg⋅K)

B

231.5 J/(kg⋅K)

C

14.3 J/(kg⋅K)

D

1.20×10^{4} J/(kg⋅K)

3

example

### Heating Cup of Water

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PRACTICE PROBLEMS AND ACTIVITIES (29)

- A nail driven into a board increases in temperature. If we assume that 60% of the kinetic energy delivered by ...
- While painting the top of an antenna 225 m in height, a worker accidentally lets a 1.00-L water bottle fall fr...
- In an effort to stay awake for an all-night study session, a student makes a cup of coffee by first placing a ...
- In very cold weather a significant mechanism for heat loss by the human body is energy expended in warming the...
- A lava flow is threatening to engulf a small town. A 400-m-wide, 35-cm-thick tongue of 1200°C lava is advancin...
- 10 g of aluminum at 200°C and 20 g of copper are dropped into 50 cm^3 of ethyl alcohol at 15°C. The temperatur...
- A flow-through electric water heater has a 20 kW electric heater inside an insulated 2.0-cm-diameter pipe so t...
- A typical nuclear reactor generates 1000 MW (1000 MJ/s) of electric energy. In doing so, it produces 2000 MW o...
- The beaker in FIGURE P19.45, with a thin metal bottom, is filled with 20 g of water at 20°C. It is brought int...
- 512 g of an unknown metal at a temperature of 15°C is dropped into a 100 g aluminum container holding 325 g of...
- The burner on an electric stove has a power output of 2.0 kW. A 750 g stainless steel teakettle is filled with...
- 30 g of copper pellets are removed from a 300°C oven and immediately dropped into 100 mL of water at 20°C in a...
- Calculate what will happen when 1000 J of heat is added to 100 grams of(e) steam at 110°C.
- (II) Samples of copper, aluminum, and water experience the same temperature rise when they absorb the same amo...
- (II) (a) How long does it take a 750-W coffeepot to bring to a boil 0.75 L of water at sea level initially at ...
- (I) In an internal combustion engine, air at atmospheric pressure and a temperature of about 20°C is compresse...
- An automobile cooling system holds 18 L of water. How much heat does the water absorb if its temperature rises...
- (II) A 0.40-kg iron horseshoe just forged and very hot (Fig. 19–31), is dropped into 1.35 L of water in a 0.30...
- (II) A 0.095-kg aluminum sphere is dropped from the roof of a 55-m-high building. If 65% of the thermal energy...
- (II) The heat capacity, C, of an object is defined as the amount of heat needed to raise its temperature by 1 ...
- (II) When a 290-g piece of iron at 180°C is placed in a 95-g aluminum calorimeter cup containing 250 g of glyc...
- Metabolizing 1.0 kg of fat results in about 3.7 x 10⁷ J of internal energy in the body.(a) In one day, how muc...
- In a typical squash game (Fig. 19–38), two people hit a soft rubber ball at a wall. Assume that the ball hits ...
- A microwave oven is used to heat 250 g of water. On its maximum setting, the oven can raise the temperature of...
- To get an idea of how much thermal energy is contained in the world’s oceans, estimate the heat liberated when...
- (I) If a heater supplies 1.8 x 10⁶ J/h to a room 3.5 m x 4.6 m x 3.0 m containing air at 20°C and 1.0 atm, by ...
- A 12-g lead bullet traveling at 220 m/s passes through a thin wall and emerges at a speed of 160 m/s. If the b...
- (II) The 1.20-kg head of a hammer has a speed of 7.5 m/s just before it strikes a nail (Fig. 19–32) and is bro...
- (II) Estimate the Calorie content of 65 g of candy from the following measurements. A 15-g sample of the candy...