A sleeping 68 kg man has a metabolic power of 75 W . How many Calories does he burn during an 8.0 hour sleep? Express your answer using two significant figures.

An uninsulated container holds 3.5 mol of an ideal gas at an initial temperature of 300 K. The gas is compressed by a movable piston, and 500 J of work is done on the gas while being compressed. If the final temperature of the gas is 400 K, how much heat flows in or out of the gas during this process?

A thermodynamic system undergoes a process where its internal energy increases by 200 J. During this time interval, 75J of heat is transferred from the system. How much energy in the form of work is transferred?

A heat pump operates with an outside temperature of –10°C and an inside temperature of +19°C. If the building requires 1.6 GJ of heat per day, what is the average power requirement in kW for the heat pump?

A 53−kg person drinks5.4×102g of milk, which has a caloric value of approximately 3.0 kJ/g.If only 17 percent of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? Enter your answer in scientific notation. Hint: The work done in ascending is given by mgh, where m is the mass (in kg), g is the gravitational acceleration(9.8 m/s2), and h is the height (in meters).

In the past decades, coal was used to heat the engine of a steam locomotive. With the engine, a steam locomotive can be accelerated to a desired speed. Calculate the efficiency of the steam engine, when the calorific value of coal is MJ H = 27.9000 , velocity of the m, = 115 t weighted locomotive is v = 93 km. Amount of coal used is me = 11 kg h What is the amount of heat? MJ What is the kinetic energy? Ek MJ = What is the efficiency? η =

SANAE IV, a research station of The South African National Antarctic Programme (SANAP), is located on Vesleskarvet, Queen Maud Land.  It uses an underground lake  as the cold reservoir of a Carnot heat pump that maintains the temperature of a science lab at 302.8 K. To deposit 13488 J of heat in the lab, the heat pump requires 1022 J of work. Determine the temperature of water in the underground lake, in Kelvin

The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system.  How much heat, in joules, is transferred into a system when its internal energy decreases by 165 J while it was performing 27.5 J of work?

An engine does 18,500J of work and rejects 6550 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir?