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# Chapter 10 Practice 1

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## Richard Datwyler

on 12 November 2018

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#### Transcript of Chapter 10 Practice 1

The lowest point in Death Valley is 85 m below sea level. The summit of nearby Mt. Whitney has an elevation of 4420 m above sea level. What is the potential energy change of a 60 kg hiker who goes from the bottom of Death valley to the top of Mt. Whitney?
2.65 MJ
With what minimum speed must you toss a 140 g ball straight up to just touch the 15-m-high roof of the gymnasium if you release the ball 1.6 m above the ground? Solve this problem using energy.
What is the speed when it hits the ground?
17.1 m/s
16.2 m/s
What minimum speed does a 100 g puck need to make it to the top of a 3.00 m -long, 28.0 frictionless ramp?
0
5.25 m/s
A 40 g ice cube can slide up and down a frictionless 30 slope. At the bottom, a spring with spring constant 30 N/m is compressed 10 cm and used to launch the ice cube up the slope. How far up the slope does it go?
0
It's your birthday, and to celebrate you're going to make your first bungee jump. You stand on a bridge 110 m above a raging river and attach a 35-m-long bungee cord to your harness. A bungee cord, for practical purposes, is just a long spring, and this cord has a spring constant of 44 N/m . Assume that your mass is 77 kg . After a long hesitation, you dive off the bridge. How close are you to the water when you stop moving down?
19.2 m
76.6 cm
If the single spring compressed by a distance of 5 cm pushes 2.5 kg mass up to a max speed of 20 cm/s. What is the spring constant (no friction)
40 N/m
How fast would two identical spring push the same block, if still compressed 5 cm?
28.3 cm/s
If the single spring ( k=25 N/m) compressed by a distance of 5 cm pushes 2.5 kg, what is the max speed it reaches (no friction)?
15.8 cm/s
How fast would the same block get moving, if it is still only compressed 5 cm?
11.2 cm/s
Chapter 10 Practice 1
"Calculate vr, the speed of the ball when it leaves the launching ramp."
"I would like to see how changing initial y position for gravitational energy doesn't change the entire energy of the system"
"Can you go into more detail about what a conserved system is"
"Could you explain more on how to find velocity using potential energy?"
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