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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?
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?
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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