Which two factors cause one part of earth to have summer while another part is having winter?

Abaseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. after it is hit, the ball leaves the bat at 50.0 m/s directly back. find the impulse of the bat on the ball. 7.25 kg*m/s 13.1 kg*m/s 5.80 kg*m/s 1.45 kg*m/s

Diamond will scratch quartz. true or false

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?