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A helicopter is ascending vertically with a speed of 13.6 m/s. At a height of 125 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: packages initial speed equals the helicopter's].
A student (m= 75 kg) falls freely from rest and strikes the ground. throughout the collision with ground, he comes to rest in a time of 0.040 s. the average force exerted on him by the ground is +18 000 N.
A uniform 1.7-kg rod that is 0.93 m long is suspended at rest from the ceiling by two springs, one at each end. Both springs hang straight down from the ceiling. The springs have identical lengths when they are unstretched. Their spring constants are..
A car moving at 30.0 m/s is approaching a factory whistle that has a frequency of 500 Hz. find the apparent frequency of the whistle as heard by the driver
A 63.5kg astronaut is doing a repair in space on the orbiting space station. She throws a 2.35kg tool away from her at 3.60m/s relative to the space station. With what speed will she begin to move\\
A playground carousel is rotating counterclockwise about its center on frictionless bearings. Find the final angular speed of the carousel
In exercise physiology studies, it is sometimes important to determine the location of a person's center of mass. How far from the woman's feet is her center of mass
An object with mass 1.2 kg slides down a smooth ramp. Initial height is 2m. It is a smooth horizontal track (no friction). by how much is the spring compressed by the object
the dentists chair uses a hydraulic press in which the radius of the smaller piston is 3 cm. the dentist wishes to
Decide the speed with the rock is thrown
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
Determined to test the law of gravity for himself, a student walks off a skyscraper 180 m high, stopwatch in hand, and starts his free fall (zero initial velocity).
The initial kinetic energy of the neutron is 2.50X10^-13 J. Find its final kinetic energy
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