2. A baseball is dropped from the top of a building. Air resistance (a non-conse

Question

2. A baseball is dropped from the top of a building. Air resistance (a non-conservative force that opposes the motion of the ball) acts on the baseball as it drops. Which of the following statements is true? a. The change in potential energy of the baseball as it falls is equal to the kinetic energy of the baseball just before it strikes the ground. b. The change in potential energy of the baseball as it falls is greater than the kinetic energy of the baseball just before it strikes the ground. c. The change in potential energy of the baseball as it falls is less than the kinetic energy of the baseball just before it strikes the ground. d. The change in potential energy of the baseball as it falls is equal to the energy lost due to the friction from the air resistance while the ball is falling. 3. A high-wire circus performer falls onto a safety net opposed to falling onto the floor. This is safer for the performer because: a. The safety net increases the contact time. b. The safety net decreases the impulse delivered to the performer. c. Both of the above. d. Neither of the above.

Explanation / Answer

2] In the absence of air resistance, the change(loss) in potential energy of the ball would be equal to the change(gain) in kinetic energy of the ball at each and every point of the free fall motion. However, due to air resistance, the loss in potential energy is equal to work done due to air friction and the gain in kinetic energy of the ball.Hence option B is correct.

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

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