There is a basketball with a diameter of 9in. and a softball with a diameter of 4in. Find how many times greater the volume of the basketball is as that of the softball.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Asher cycles 12 miles in 16 hours. what is his speed?

Positrons are spontaneously emitted from the nuclei of