Ahiker wears a 7.5 kg backpack while climbing a mountain. after 30 mins thw hiker is 8.2 m above the starting point. what is the average amount of power created by the hiker?

Why there is no inductive reactance in dc circuits

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.

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