Question

Asked Dec 12, 2019

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1.If we know an object is moving at constant velocity, we may assume: a. the net force acting on the object is zero.

b. there are no forces acting on the object.

c. the object is accelerating.

d. the object is losing mass.

2.Two forces act on a 6.00-kg object. One of the forces is 10.0 N. If the object accelerates at 2.00 m/s2, what is the greatest possible magnitude of the other force?

a. 1.0N

b. 2.0N

c. 22.0 N d. 34.0 N

3.If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:

a. at rest.

b. moving with a constant velocity.

c. being accelerated. d. losing mass.

4.A karate master strikes a board with an initial velocity of 10.0 m/s, decreasing to 1.0 m/s as his hand passes through the board. If the time of contact with the board is 0.002 0 s, and the mass of the coordinated hand and arm is 1.0 kg, what is the force exerted on the board?

a. 1000N

b. 1800N c. 2700N d. 4500N

5.Rupel pushes a box 5.00 m by applying a 25.0-N horizontal force. What work does she do?

a. 10.0 J

b. 25.0 J

c. 125J

d. 550J

6.Which of the following is that form of energy associated with an object's location in a conservative force field?

a. potential

b. thermal

c. bio-chemical d. kinetic

7.A 7.00-kg bowling ball falls from a 2.00-m shelf. Just before hitting the floor, what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)

a. 14.0 J

b. 19.6 J

c. 29.4 J

d. 137J

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