As an object slides across a rough horizontal surface, what happens to the object's gravitational potential energy with respect to the surface and speed? (1) Both gravitational potential energy and speed decrease. (2) Gravitational potential energy decreases and speed remains the same. (3) Gravitational potential energy remains the same and speed decreases.
(4) Both gravitational potential energy and speed remain the same.​

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

The arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s . 1.) a. precipitation b. water vapor c. icy debris 2.) a. gravitational compression b. biochemical cycling c. radiogenic heating 3.) a, gravity b. magnetic field c. heat energy for plato

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine