A 120 N force is applied at an angle of 30.0 degrees above the horizontal to a 4.00 kg box. The box moves a horizontal distance of 8.00 meters on a frictionless surface. The change in the kinetic energy of the box is Group of answer choices

831 J.

750 J.

890 J.

920 J.

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)

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

Could we see a galaxy that is 20 billion light-years away?