E4. A force of 45 N acts on a ball for 0.2 s. If the ball is ini- tially at rest:
a. What is the impulse on the ball?
b. What is the final momentum of the ball?

28. a stone is projected at a cliff of height h with an initial speed of 42.0 mls directed at angle θ0 = 60.0° above the horizontal. the stone strikes at a, 5.50 s after launching. find (a) the height h of the cliff, (b) the speed of the stone just before impact at a, and (c) the maximum height h reached above the grou

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above