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18. A hallway of energy is constructed. People are told that to do 1.00 J of work, they should pull on a rope that lifts a block 1.00 m. What should be the mass of the block?

18. A hallway of energy is constructed. People are told that to do 1.00 J of work, they should pull on a rope that lifts a block 1.00 m. What should be the mass of the block?

College Physics
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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KE -5nv V5 Ho hmuch work was done to change her speed? VS. Now what is her kinetic energy? KE- C45)5) 562.53) 562.5=11687.5) Z258. 10 Shawn and his bike have a total mass of 45.0-kg. Shawn rides 1800 m in 600 seconds at n constant velocity. What is Shawn's kinetic energy? 1800=606 -3 KE KE 5)() 11. Matt and Will each have a mass of 60-kg and they are moving together with a velocity of 10.0 m/s. What is their combined kinețic energy? n=60 K KE = (60) Clo)? కెలంబు V=l0.0m/s 12. A 2000-kg car has a velocity of 12.0 m/s. The car then hits a tree. The tree doesn't move and the car comes to rest. a. Find the change in kinetic energy of the car. n-2000 K v= 17.6 n/s b. Find the amount of work done in pushing in the front of the car. KE-mv? KE-(2000)(:0-4370J c. Find the size of the force that pushed in the front of the car in 0.50 m. 13. How much potential energy does Tim, mass 60.0-kg, gain when he climbs a gymnasium rope a distance m= b6 of 3,5 m? GPE=n ngh GPE = (60) (9.8).5)= 9= 9.8 ト=)5 14. A 6.4-kg bowling ball is lifted 2.1 m into a storage rack. Calculate the increase in the ball's potential 2058.5 energy. m=6.4 9 9 = 9.8 15. Mary weighs 500-N and walks down a flight of stairs to a level 5.50 m below her starting point. What is the change in Mary's potential energy? E= 500 N GPE = mgh GPE = (6.4) (9.8) (2-1) =131.712 (500) (5.50)=2750J 16. Å weightlifter raises a 180-kg barbell to a height of 1.95 m. What is the increase in the barbell's potential energy? m =180 Kg g-9.8 h-1.98 GPE = mgh OPE = C180)(9.8) (1.98) = 3492.72J 17. A 10.0-kg rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1960 J by the time the rocket motor burns out of fuel. What additional height will the rocket rise? 18. A hallway of energy is constructed. People are told that to do 1.00 J of work, they should pull on a rope that lifts a block 1.00 m. What should be the mass of the block?
Transcribed Image Text:KE -5nv V5 Ho hmuch work was done to change her speed? VS. Now what is her kinetic energy? KE- C45)5) 562.53) 562.5=11687.5) Z258. 10 Shawn and his bike have a total mass of 45.0-kg. Shawn rides 1800 m in 600 seconds at n constant velocity. What is Shawn's kinetic energy? 1800=606 -3 KE KE 5)() 11. Matt and Will each have a mass of 60-kg and they are moving together with a velocity of 10.0 m/s. What is their combined kinețic energy? n=60 K KE = (60) Clo)? కెలంబు V=l0.0m/s 12. A 2000-kg car has a velocity of 12.0 m/s. The car then hits a tree. The tree doesn't move and the car comes to rest. a. Find the change in kinetic energy of the car. n-2000 K v= 17.6 n/s b. Find the amount of work done in pushing in the front of the car. KE-mv? KE-(2000)(:0-4370J c. Find the size of the force that pushed in the front of the car in 0.50 m. 13. How much potential energy does Tim, mass 60.0-kg, gain when he climbs a gymnasium rope a distance m= b6 of 3,5 m? GPE=n ngh GPE = (60) (9.8).5)= 9= 9.8 ト=)5 14. A 6.4-kg bowling ball is lifted 2.1 m into a storage rack. Calculate the increase in the ball's potential 2058.5 energy. m=6.4 9 9 = 9.8 15. Mary weighs 500-N and walks down a flight of stairs to a level 5.50 m below her starting point. What is the change in Mary's potential energy? E= 500 N GPE = mgh GPE = (6.4) (9.8) (2-1) =131.712 (500) (5.50)=2750J 16. Å weightlifter raises a 180-kg barbell to a height of 1.95 m. What is the increase in the barbell's potential energy? m =180 Kg g-9.8 h-1.98 GPE = mgh OPE = C180)(9.8) (1.98) = 3492.72J 17. A 10.0-kg rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1960 J by the time the rocket motor burns out of fuel. What additional height will the rocket rise? 18. A hallway of energy is constructed. People are told that to do 1.00 J of work, they should pull on a rope that lifts a block 1.00 m. What should be the mass of the block?
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