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  11. If we know that a nonzero net force acting

Question :   11. If we know that a nonzero net force acting : 2102100

 

11. 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.

12. A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest (45? N of W). What is the magnitude of the resultant acceleration?

A. 2.2 m/s2

B. 2.1 m/s2

C. 1.5 m/s2

D. 3.0 m/s2

13. A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest (45? N of W). What is the direction of the resultant acceleration?

A. 60? N of E

B. 30? N of W

C. 30? N of E

D. 74? N of W

14. A cart of weight 20 N is accelerated across a level surface at 0.15 m/s2. What net force acts on the wagon? (g = 9.8 m/s2)

A. 0.92 N

B. 0.31 N

C. 3.0 N

D. 4.5 N

15. A rock is rolled in the sand. It starts at 5.0 m/s, moves in a straight line for a distance of 3.0 m, and then stops. What is the magnitude of the average acceleration?

A. 1.8 m/s2

B. 4.2 m/s2

C. 5.4 m/s2

D. 6.2 m/s2

 

Solution
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