# Question: A heat engine with a thermal efficiency of 25 is

A heat engine with a thermal efficiency of 25% is used to hoist 2.5-kg bricks to an elevation of 3.0 m. If the engine expels heat to the environment at a rate of 1.2 x 106 J/h, how many bricks can the engine hoist in 2.0 h?

## Answer to relevant Questions

An ideal gas is under an initial pressure of 2.45 x 104 Pa and occupies a volume of 0.20 m3. The slow addition of 8.4 x 103 J of heat to this gas causes it to expand isobarically to a volume of 0.40 m3. (a) How much work is ...A quantity of an ideal gas at an initial pressure of 2.00 atm undergoes an adiabatic expansion to atmospheric pressure. What is the ratio of the final temperature to the initial temperature of the gas? Can harmonic sound of any frequency be generated and heard from a violin string with a fixed tension? Explain. (a) At what position is the magnitude of the force on a mass in a mass–spring system minimum: (1) x = 0, (2) x = – A, or (3) x = + A? Why? (b) If m = 0.500 kg, k = 150 N/m, and A = 0.150 m, what are the magnitude of the ...A 0.250-kg ball is dropped from a height of 10.0 cm onto a spring, as illustrated in Fig. 13.24. If the spring has a spring constant of 60.0 N/m, (a) What distance will the spring be compressed? (Neglect energy loss during ...Post your question