A6.0 kg block, starting from rest, slides down a frictionless incline of length 2.0 m. when it arrives at the bottom of the incline, it's speed is vf. at what distance from the top of the incline is the speed of the block 0.5vf?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.