A 250-g block is coasting at 1.5 m/s and collides head-on with another block that is at rest. Right after collision, the two blocks are locked together, traveling at 0.5 m/s. Is the second block heavier than the first block? Justify your answer.

Answer as quick as ! kate is working on a project in her tech education class. she plans to assemble a fan motor. which form of energy does the motor convert most of its electric energy into? a. light energyb. motion energyc. sound energyd. thermal energy

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)

Explain why electric current cannot exist if a current doesn't have a voltage source.