Does the centripetal force acting on an object do work on the object? A) No, bec

Question

Does the centripetal force acting on an object do work on the object? A) No, because the object has constant speed. B) Yes, since a force acts and the object moves, and work is force times distance. C) Yes, since it takes energy to turn an object. D) No, because the force and the displacement of the object are perpendicular. E) Yes, if the object does not complete the circle. A 2.00-kg object moves with constant velocity 3.00 m/s toward the east. Two forces act on the object The first is a 40.0 N force toward the west. What is the second force that acts on the object? (Draw free body diagram) A) 26.7 N east B) 23.0 N east C) 40.0 N east D) 46.0 N west e) 46.0 N east You and your friend want to go to the top of the Eiffel Tower. Your friend takes the elevator straight up. You decide to walk up the spiral stairway, taking longer to do so. Compare the gravitational potential energy (U) of you and your friend, after you both reach the top. Assume that you and your friend have same mass) A) Your friend's U is greater than your U, because she got to the top faster. B) It is impossible to tell, since the distances are unknown. C) Your U is greater than your friends U, because you traveled a greater distance in getting to the top D) It is impossible to tell, since the times are unknown. E) Both of you have the same amount of potential energy. Two identical balls are thrown from the top of a building with the same speed. Ball 1 is thrown horizontally, while ball 2 is thrown at an angle theta above the horizontal Neglecting air resistance, which ball will have the greatest speed when hitting the ground below? A) Ball 1 B) Ball 2 C) Both balls reach the ground with the same speed. D) Cannot be determined without knowing the time each ball is in the air. E) Cannot be determined without knowing the height of the building.

Explanation / Answer

1) as the centripetal force is always perpendicular to the velocity , the work done by the centripetal force is Zero.

the correct option is D)

2)

the other force is opposite to the force applied

the correct option is C)

3)

as the final height is same

the correct option is E)

4)

at the ground , using conservation of energy

the correct option is C)

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.