Asample of shale contains 0.03% 238u by weight. calculate the number of spontaneous fissions in one day in a 106 kg pile of the shale by determining the following quantities. the density of uranium is 19 g/cm3. the spontaneous fission activity rate is 0.69 fissions/(kg·s).

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

While you are driving in the lane next to the curb on a multi-lane road the car on your left suddenly moves toward you lane. they are about toy crash into your front fender. you

Ways that industry and agriculture use physical properties to separate substances