3. Your friend is waiting below your second story apartment window for you give him the keys so he can come visit. You drop the keys (m = 50 g) from 10 m above the ground to your friend who catches them 1.0 m above the ground. Ignore air-resistance. (a) How much work is done on the keys by gravity during the drop? (b) What is the change in gravitational energy during the drop? If the gravitational potential energy is zero on the ground: (c) What is the gravitational potential energy when the keys were dropped? (d) What is the gravitational potential energy when they reach your friend? If the reference point of zero gravitational potential energy is a person looking out a window below your apartment, 3 m above the ground: (e) What is the gravitational potential energy when the keys were dropped? (f) What is the gravitational potential energy when they reach your friends hand? (g) Does the change in gravitational energy during the drop depend on the choice where the gravitational energy is zero?

3. Your friend is waiting below your second story apartment window for you give him the keys so he can come visit. You drop the keys (m = 50 g) from 10 m above the ground to your friend who catches them 1.0 m above the ground. Ignore air-resistance. (a) How much work is done on the keys by gravity during the drop? (b) What is the change in gravitational energy during the drop? If the gravitational potential energy is zero on the ground: (c) What is the gravitational potential energy when the keys were dropped? (d) What is the gravitational potential energy when they reach your friend? If the reference point of zero gravitational potential energy is a person looking out a window below your apartment, 3 m above the ground: (e) What is the gravitational potential energy when the keys were dropped? (f) What is the gravitational potential energy when they reach your friends hand? (g) Does the change in gravitational energy during the drop depend on the choice where the gravitational energy is zero?

Name: Only parts E, F, & G please! 3. Your friend is waiting below your seco
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Description: Only parts E, F, & G please! 3. Your friend is waiting below your second story apartment window for you give himthe keys so he can come visit. You drop the keys (m = 50 g) from 10 m above theground to your friend who catches them 1.0 m above the grou

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter8: Potential Energy And Conservation Of Energy

Section: Chapter Questions

Problem 65P: A block of mass 200 g is attached at the end of a massless spring of spring constant 50 N/m. The...

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