Stone needs 1350 J of energy to crack down. A bullet of 120 gm is fired on with the velocity of 140 m/s. Can it crack it down? Calculate. If not, what
minimum mass should the bullet have in order to break the stone? Calculate.
IN​

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?