8. A student does 300. joules of work pushing a cart 3.0 meters due east and then does 400. joules of work pushing the cart 4.0 meters due north. The total amount of work done by the student is (1) 100. J (2) 500. J (3) 700. J (4) 2500 J

College Physics
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Author:Paul Peter Urone, Roger Hinrichs
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Chapter7: Work, Energy, And Energy Resources
Section: Chapter Questions
Problem 7PE: A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N...
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please help with questions 8,9 and 10
8. A student does 300. joules of work pushing a
cart 3.0 meters due east and then does 400.
joules of work pushing the cart 4.0 meters due
north. The total amount of work done by the
student is
(1) 100. J
(2) 500. J
(3) 700. J
(4) 2500 J
9. A constant horizontal force of 20.0 newtons east
applied to a box causes it to move at a constant
speed of 4.0 meters per second. Calculate how
much work is done against friction on the box in
6.0 seconds.
10. A horizontal force with a magnitude of 3.0
newtons applied to a 7.0-kilogram mass moves
the mass horizontally a distance of 2.0 meters.
Determine the work done against gravity in
moving the mass.
Transcribed Image Text:8. A student does 300. joules of work pushing a cart 3.0 meters due east and then does 400. joules of work pushing the cart 4.0 meters due north. The total amount of work done by the student is (1) 100. J (2) 500. J (3) 700. J (4) 2500 J 9. A constant horizontal force of 20.0 newtons east applied to a box causes it to move at a constant speed of 4.0 meters per second. Calculate how much work is done against friction on the box in 6.0 seconds. 10. A horizontal force with a magnitude of 3.0 newtons applied to a 7.0-kilogram mass moves the mass horizontally a distance of 2.0 meters. Determine the work done against gravity in moving the mass.
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