A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. If he hits the ball with a velocity of 7.5 m/s and then stops, what impulse did he imply on the ball? What is the ball's velocity?

Immature forms of many animals, like Guinea worms, before they morph into adults

Earths magnetic poles do not stay in the same place. Write a possible explanation for why earths magnetic poles move.

A 10 kilogram of mass iron on Earth exerts a downward force of 98 newtons. On the moon this same 10 kilograms of iron i weighed and found to exert a downward force of 16.3 newtons, how is this possible

The United States possesses the ten largest warships in the world, aircraft carriers of the Nimitz class.

Which of the following is made from a Crystaline solid that conducts a current only under certain circumstances? •vacuum tube •cathode-ray tube •analog device •semiconductor

What is s the best description of the constructive interference of light? A. two waves have the same direction of displacement. B. two waves have displacement in opposite directions. C. a longitudinal wave meets a transverse light wave D.

1875 kg car is traveling at 22 m/s. It's momentum is?

Hot air balloon rises because a) molecules become lighter when heated b) molecules move faster and farther apart when heated c) molecules are less attracted by gravity when heated d) molecules become charged and repel each other when heated

If the diameter of the space station is 730 m, how many revolutions per minute are needed for the "artificial gravity" acceleration to be 9.80m/s2?

A person who has dissociative identity disorder: O A. cannot remember who he or she is. O B. has panic attacks when confronted. C. has two or more distinct personalities OD hears voices