A boy standing on a frictionless ice rink is initially at rest. He throws a snowball in the +x-direction, and it travels on a ballistic trajectory, hitting the ground some distance away.  Which of the following is true about the boy while he is in the act of throwing the snowball?  a. He feels an upward force to compensate for the downward trajectory of the snowball.  b. He feels a backward force exerted by the snowball he is throwing.  c. He feels no net force. d. He feels a forward force, the same force that propels the snowball.

At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 810 m/s2 and the vertical or y component of its acceleration is 980 m/s2. The ball's mass is 0.45 kg. What is the magnitude of the net force acting on the soccer ball at this instant?

A 70.0-kg astronaut named Matt McConoughey pushes to the left on his space capsule with a force F in space. Assume there is no air or gravity around him. The spacecraft has a total mass of 10000 kg. While he is pushing on the capsule, the astronaut accelerates to the right with an acceleration of 0.36 m/s² Which one of the following statements concerning this situation is true? a) The space capsule does not move, but the astronaut moves to the right with a constant speed. b) The astronaut stops moving after he stops pushing on the space capsule. c) The force exerted on the astronaut is larger than the force exerted on the space capsule. d) The velocity of the astronaut increases while he is pushing on the space capsule. e) The force exerted on the space capsule is larger than the force exerted on the astronaut.

d chance exam is optional. If you Begin this exam, it will count toward your grade. Question 1 What is the force between a 3-kg bag of flour and a 5-kg bag of sugar that are 0.5 m apart? 3.8x10-7 N 4.0 10-9N 60 N 30 N 20x10-9 N Previous