Air initially at 0.1 MPa, 27 degC, is compressed reversibly to a final state. Assume air is an ideal gas with constant specific heats. (a) Find the entropy change of the air when the final state is 0.5 MPa, 227 degC.

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

One number is said to be an "order of magnitude" larger than another number if choose one: a. it is 10 times larger. b. it is 5 times larger. c. it is 3 times larger. d. it is 100 times larger. e. it is 2 times larger.