A tennis player manages to hit a tennis ball with her racquet so that the ball passes over the net and lands in her opponent's court. A very strong wind is present. Consider the following forces: A downward force of gravity, a force by the "hit", and a force exerted by the air
Which of these forces is (are) acting on the tennis ball after it has left contact with the racquet and before it touches the ground?
a) 1 only b) 1 and 2 c) 2 and 3 d) 1 and 3 e) 1, 2 and 3

The plum pudding model of the atom states that ?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

How do the kidneys affect homeostasis