9. Work & Energy
Net Work & Work-Energy Theorem
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- Multiple Choice
You pull a 3kg box on a flat surface. The coefficient of kinetic friction is 0.6. When you pull the box horizontally through a distance of 10m, it accelerates at 2m/s2. Find the net work on the box.
1448views19rank9comments - Multiple Choice
To pull a 51 kg crate across a rough floor, a worker applies a force of 100 N, directed 37°above the horizontal. The coefficient of friction is 0.16. If the crate moves 3.0 m, what is the total work done on the crate?
1376views19rank8comments - Multiple Choice
A box slides across the floor with an initial speed of 3.5m/s. If the coefficient of kinetic friction is 0.15, how far will the box slide before stopping completely?
1503views25rank - Multiple ChoiceRhys gave a crate a shove across a horizontal floor. When the crate left his hands, it was moving . If the coefficient of kinetic friction between the crate and the floor is 0.32, how far will the crate slide? Use energy concepts to solve this problem.509views1rank
- Textbook QuestionYou throw a 3.00-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work–energy theorem to find (b) its maximum height.1092views
- Textbook QuestionA 1.50-kg book is sliding along a rough horizontal surface. At point A it is moving at 3.21 m/s, and at point B it has slowed to 1.25 m/s. (a) How much work was done on the book between A and B?1551views
- Textbook QuestionYou throw a 3.00-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work–energy theorem to find (a) the rock's speed just as it left the ground5596views8rank
- Textbook Question
(II) An 85-g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 75 cm. What is the speed of the arrow as it leaves the bow?
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