5. A 98-N sack of grain is hoisted to a storage room 50 m above the ground floor of a grain elevator. a. How much work was required? b. What is the potential energy of the sack of the grain at this height? c. The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What is the kinetic energy does the sack have just before it strikes the ground floor?
5. A 98-N sack of grain is hoisted to a storage room 50 m above the ground floor of a grain elevator. a. How much work was required? b. What is the potential energy of the sack of the grain at this height? c. The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What is the kinetic energy does the sack have just before it strikes the ground floor?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:5. A 98-N sack of grain is hoisted to a storage room 50 m above the ground floor of a grain elevator.
a. How much work was required?
b. What is the potential energy of the sack of the grain at this height?
The rope being used to lift the sack of grain breaks just as the sack reaches the storage room.
What is the kinetic energy does the sack have just before it strikes the ground floor?
с.
6. A 20-kg rock is on the edge of a 100 m cliff.
a. What potential energy does the rock possess relative to the base of the cliff?
b. The rock falls from the cliff. What is the kinetic energy just before it strikes the ground?
c. What speed does the rock have as it strikes the ground?
7. An archer puts a 0.30-kg arrow to the bowstring. An average force of 201 N is exerted to draw the string
back 1.30 m.
a. Assuming no frictional loss, with what speed does the arrow leave the bow?
b. If the arrow is shot straight up, how high does it rise?
8. A physics book, mass unknown, is dropped 4.50 m. What speed does the book have just before it hits
the ground?
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