Molecular Physics | Thermodynamics Answers

A 6.00-kg piece of solid copper metal at an initial temperature T is placed with 2.00 kg of ice that is initially at – 20.0oC. The ice is in an insulated container of negligible mass and no heat is exchanged with the surroundings. After thermal equilibrium is reached, there is 1.20 kg of ice and 0.80 kg of liquid water. What was the initial temperature of the piece of copper?

A glass flask whose volume is 1000.00 cm3 at 0.0oC is completely filled with mercury at this temperature. When flask and mercury are warmed to 55.0oC, 8.95 cm3of mercury overflow. If the coefficient of volume expansion of mercury is 18.0 X 10-5 K-1 compute the coefficient of volume expansion of the glass.

A modern digital barometer says that atmospheric pressure is 101.293 kPa and the height of mercury in the barometer is 762.79 mm as shown. What is the absolute pressure of the gas in the bulb of this barometer (in Pa)? [The density of mercury at this temperature is 13534 kg m−3 . In this problem use g = 9.807 m s−2 .]

A 79 kg weight-watcher wishes to climb a

mountain to work off the equivalent of a large

piece of chocolate cake rated at 571 (food)

Calories.

How high must the person climb? The

acceleration due to gravity is 9.8 m/s

2

and 1

food Calorie is 103

calories.

Answer in units of km.

How much time does a meter stick moving at 0.1c relative to an observer take to pass the

observer? The meter stick is parallel to its direction of motion.

A spacecraft antenna is at an angle of 10◦

relative to the axis of the spacecraft. If the

spacecraft moves away from the earth at a speed of 0.70c, what is the angle of the antenna

as seen from the earth?

In the Michelson-Morley experiment, the length of the paths of the two beams is 11 m each.

The wavelength of the light used is 6000 ̊A. If the expected fringe shift is 0.4, calculate the

velocity of the earth relative to the ether.

An air bubble of volume 0.5cm3 when released at the bottom of a lake rise's to the surface of the lake.Explain why

Find the change in entropy when (a) 3.0 kg of boiling water changes to steam at 100ºC, (b) 3.0 kg of water is heated from 20ºC to 80ºC, and (c) 2.0 kg of water at 30ºC are mixed with 5.0 kg of water at 75ºC and the mixture allowed to reach equilibrium.

A perfect heat engine takes in heat at 237ºC and rejects heat at 97ºC. What is the efficiency of the engine? How much heat is rejected for every 1000 joules of work done?