HYS 1101-01 Fall 2017 Quiz 2 Name: Date: Physies Quiz 2 Each numbered problem is

Question

HYS 1101-01 Fall 2017 Quiz 2 Name: Date: Physies Quiz 2 Each numbered problem is worth 10 points. If you show your work, you may get partial credit for a wrong answer. Sketches may help your grade. 1. What is the gravitational potential energy of a 23 kg mass 97 meters above the ground? g mass slides down a frictionless ramp from a height of 97 meters, how fast will it be 2. If a 23-k traveling at the bottom of the ramp? Chris carries a 50 kg mass 9 vertical meters up a stairway in the RFC building. How much net 3. work did this entail? y does a satellite in an elliptical orbit travel faster when it is closer to the earth than when it

Explanation / Answer

2.

Given: m =23 kg ; h = 97 m

Goal: Have to find final velocity at bottom of ramp

Solution:

Applying equation of motion :

v2 = u2 +2gh

u = 0 [ initial the mass was at rest ]

v = [2gh]1/2

= [2×9.81×97]1/2

= 43.62 m/s

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