1. Two men are moving a heavy metal box with a mass of 225 kg from an initial position to one that is &8 m away towards the right. The man on the left of the box pushes the box with a force of 12 N at angle 30° downward from the horizontal while the man on the right of the box pulls it with a force of 10N 40° above the horizontal. The forces exerted by both men are constant. What is the net work (Wnet) the men exert on the box? 2. In example 1, the box of cookies has a mass of 45 kg and the coefficient of friction between floor and the box is 0.3. Determine the work done by each force if the factory worker pushes the box 8 m across the factory floor.
1. Two men are moving a heavy metal box with a mass of 225 kg from an initial position to one that is &8 m away towards the right. The man on the left of the box pushes the box with a force of 12 N at angle 30° downward from the horizontal while the man on the right of the box pulls it with a force of 10N 40° above the horizontal. The forces exerted by both men are constant. What is the net work (Wnet) the men exert on the box? 2. In example 1, the box of cookies has a mass of 45 kg and the coefficient of friction between floor and the box is 0.3. Determine the work done by each force if the factory worker pushes the box 8 m across the factory 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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Number 1 answer should be 144 J.
Number 5 answer should be 988 J.
You must answer no. 1, 2, 4, 5 and 6
Thank you in advance. I hope you can answer those questions.
Transcribed Image Text:3.3: Exercises
Work
1. Two men are moving a heavy metal box with a mass of 225 kg from an initial
position to one that is 8 m away towards the right. The man on the left of the box
pushes the box with a force of 12 N at angle 30° downward from the horizontal
while the man on the right of the box pulls it with a force of 10N 40° above the
horizontal. The forces exerted by both men are constant. What is the net work
(Wnet) the men exert on the box?
2. In example 1, the box of cookies has a mass of 45 kg and the coefficient of
friction between floor and the box is 0.3. Determine the work done by each force
if the factory worker pushes the box 8 m across the factory floor.
Kinetic Energy
Transcribed Image Text:energy theorem heré?
4. Ceres is the largest and most massive asteroid in the solar system's asterold deie.
It has an estimated mass of 9.4 x 1020 kg and an orbital speed of 17,900 m/S.
Determine the kinetic energy of Ceres.
Gravitational Potential Energy
5. Ana's father climbs the stairs in their house and increases his potential emergy by
2,000J when he does. The mass of Ana's father is 81 kg. If Anna, who has a mass
of 40 kg, climbs the stairs, how much potential energy would she gain?
6. A child of mass m starts from rest from the top of a water slide. The water slide is
7.6 meters high from the bottom of the slide, which is at water level. Assuming
that the slide's friction is negligible, what would be the child's speed at the
bottom of the slide?
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