Learning Materials
Features
Discover
Chapter 8: Q1P (page 202)
What is the spring constant of a spring that storesof elastic potential energy when compressed by?
Spring constant is, .
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
The spring in the muzzle of a child’s spring gun has a spring constant of 700 N/m. To shoot a ball from the gun, first, the spring is compressed and then the ball is placed on it. The gun’s trigger then releases the spring, which pushes the ball through the muzzle. The ball leaves the spring just as it leaves the outer end of the muzzle. When the gun is inclined upward by 30oto the horizontal, a 57 gball is shot to a maximum height of 1.83 mabove the gun’s muzzle. Assume air drag on the ball is negligible. (a) At what speed does the spring launch the ball? (b) Assuming that friction on the ball within the gun can be neglected, find the spring’s initial compression distance.
You drop abook to a friend who stands on the ground at distancebelow. If your friend’s outstretched hands are at distanceabove (fig.8-30), (a) how much workdoes the gravitational force do on the book as it drops to her hands? (b) What is the changein the gravitational potential energy of the book- Earth system during the drop? If the gravitational potential energy U of the system is taken to the zero at ground level, what is U (c) when the book is released and (d) when it reached her hands? Now take U to be 100 J at ground level and again find (e) ,(f) (g) U at the release point, and (h) U at her hands.
A 9.40 kgprojectile is fired vertically upward. Air drag decreases the mechanical energy of the projectile-Earth system by 68.0 kJduring the projectile’s ascent. How much higher would the projectile have gone were air drag negligible?
A boy is initially seated on the top of a hemispherical ice mound of radius R = 13.8 m. He begins to slide down the ice, with a negligible initial speed (Figure). Approximate the ice as being frictionless. At what height does the boy lose contact with the ice?
A volcanic ash flow is moving across horizontal ground when it encounters aupslope. The front of the flow then travels 920 mup the slope before stopping. Assume that the gases entrapped in the flow lift the flow and thus make the frictional force from the ground negligible; assume also that the mechanical energy of the front of the flow is conserved. What was the initial speed of the front of the flow?
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App