Homework Clinic
Science Clinic => Physics => Topic started by: sc00by25 on Jul 27, 2018
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A block of mass M slides down a frictionless plane inclined at an angle with the horizontal. The normal reaction force exerted by the plane on the block is
A) Mg sin .
B) zero, since the plane is frictionless.
C) Mg cos .
D) Mg.
E) Mg tan .
Question 2
A 35 N-force toward the west is applied to an object. The object moves 20 m east during the time the force is applied. What is the change in kinetic energy of the object?
A) 0.0 J
B) 0.57 J
C) 1.0 J
D) -700 J
E) 350 J
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Answer to Question 1
C
Answer to Question 2
D