# Science

posted by
**Anonymous** on
.

Any help would be appreciated!

Which of the following is a way to improve the efficiency of a heat engine?

increase Qh

reduce Qh

reduce Wnet

increase Qc

A

What are the energies associated with atomic motion called?

kinetic energy

potential energy

bond energy

internal energy

D

A 0.10 kg piece of copper at an initial temperature of 95°C is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. The water and calorimeter are initially at 15°C. What is the final temperature of the system when it reaches equilibrium?

mw = 0.20kg

cp,w = 4186J/kg°C

mAl = 0.28kg

cp,Al = 899J/kg°C

Tw = TAl = 15°C

mCu = 0.10kg

cp,Cu = 387J/kg°C

TCu = 95°C

18

Thank you!