Acar with a mass of 1.50 x 10^3 kg starts from rest and accelerates to a speed of 18.0 m/s in 12.0 s. assume that the force of resistance remains constant at 400.0 n during this time. what is the average power developed by the car's engine?

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?