You are playing catch with a friend in a moving train. when you toss the ball in the direction the train is moving, how does the speed of the ball appear to an observer standing at rest outside the train?

i know it appears to be traveling faster than the train, but i don't know the technicalities

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap