package of mass 10 kg sits at the equator of an airless asteroid of mass 6.8 105 kg and radius 46 m, which is spinning so that a point on the equator is moving with speed 4 m/s. We want to launch the package in such a way that it will never come back, and when it is very far from the asteroid...

A person skateboarding with a constant velocity

Consider a frictionless track as shown in the figure below. A block of mass m1 = 5.40 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 12.0 kg that is initially at rest. Calculate the maximum height to which m1 rises after the collision. height = 5m

A rotating cylinder about 16 {\rm km} long and 8.0 km in diameter is designed to be used as a space colony. With what angular speed must it rotate so that the residents on it will experience the same acceleration due to gravity as on Earth?

An 82-kg water skier floating in a lake is pulled from rest to a speed of 12 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?

A golf ball is released from rest from the top of a very tall building. Choose a coordinate system whose origin is at the starting point of the ball, and whose y axis points vertically upward. Neglecting air resistance, calculate the ve- locity of the ball after 2.97 s. The acceleration of...

A 7400 boxcar traveling at 16.0 strikes a second boxcar at rest. The two stick together and move off with a speed of 6.0 .What is the mass of the second car?

A dog pulls on a pillow with a force of 2.4 N at an angle of 20.1 above the horizontal a) What is the x component of this force? Answer in units of N. b) What is the y component of this force? Answer in units of N.

A laser emits a single, 3.0-ms pulse of light that has a frequency of 2.83 1011 Hz and a total power of 65 000 W. How many photons are in the pulse?

Romeo is standing 8m below Juliets window by a rose garden 9m away. How fast will the pepples hit her window?(only in a horizontal component of velocity)