A student drops an object out the window of the top floor of a high-rise dormitory. (a) Neglecting air resistance, how fast is the object traveling when it strikes the ground at the end of 4.0 s? First used standard British units and then express the speed in mi/h for a familiar comparison. How far, in meters, does the object fall during the 4.0 s? Comment on how many floors the dormitory probably has. (Assume that there are 32 floors/100 m.)
Modern oil tankers weigh over a half-million tons and have lengths of up to a quarter of a mile. Such massive ships require a distance of 5.0 km (about 3.0 mi) and a time of 22 min to come to a stop from a top speed of 26 km/h. What is the magnitude of such a ship's average acceleration in m/s2 in coming to a stop? What is the magnitude of the ship's average velocity in m/s?Comment on the potential of a tanker running aground
Why is it necessary to use at least one electromagnet in a motor instead of using only permanent magnets?
What is the magnitude of g at a height above Earth's surface where free-fall acceleration equals 6.5m/s^2?
An object is moving but we don't know its mass or velocity. A force of 20 newtons to the right is exerted on the object for 20 seconds. What is the (vector) change in linear momentum for the body as a result of this impulse?
Can someone help fill the blank spaces out please? 13 points? If a wire gets too hot it may melt. A __________ is a piece of wire that _____ if the current gets too big
a ball is dropped from rest at a height of 80 m above the ground. what is the speed just as it hits the ground?
