A woman exerts a constant horizontal force on a large box. As a result, the box
ID: 1511349 • Letter: A
Question
A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed "V_0". The constant horizontal force applied by the woman: has the same magnitude as the weight of the box. Is greater than the weight of the box. Has the same magnitude as the total force which resists the motion of the box is greater than either weight of the box or the total force which resists the motion. An empty chair at a rest on a floor. Consider the following forces: A downward force of gravity. An upward force exerted by the floor. A net down ward force exerted by the air. Which of the following forces is acting on the office hair? I only I and II only II and III only I,ii, and III none of the forces (since the chair is at rest there are no forces acting upon it) Despite a very strong wind, 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. Consider the following forces: A downward force of gravity A force by the "hit" A force exerted by the air of the forces is (are) acting on the tennis ball after it has left contact with the and before it touches the ground? I only I and IIExplanation / Answer
20) C
Newton's first law: F = 0 F = Ff
21)
the forces acting on the chair are gravity and buoyant force exerted by the air in upward direction,as well as force of the floor reaction pointing upward.
22) 1 and 3
there are other forces because the ball is spinning (magnus effect) and they are definitely acting on the ball in flight since I have hit 10000s of these spinning things and consider myself an expert on their flight, bounce, and spin properties.
Also, it depends on who is hitting the ball. If a tennis player hits the ball, then there is the imaginary force of Roger Federer on the ball since we all imagine his force is with us when we are playing
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