Unit 4 1

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WORK AND ENERGY Lesson 12 - Worksheet 1. Aforce of 25.0 Newtons is applied so as to move a 5.0 kg mass a distance of 20.0 meters. How much work was done? w, H .d W= 2% (20)= 500 3| 2. Aforce of 120 N is applied to the front of a sled at an angle of 28.0° above the horizontal so as to pull the sled a distance of 165 meters. How much work was done by the applied force? - | o381 ) el BOOD Tel Wi 3. Asled, which has a mass of 45.0 kg., is sitting on a horizontal surface. A force of 120 N is appli:.d to a rope attached to the front of the sled such that the angle between the front of the sled and the horizontal is 35.0°. As a result of the application of this force the sled is pulled a distance of 500 meters at a relatively constant speed. How much work was done to this sled by the applied (BoDI20cs5 3% 22| aovemmtd A rubber stopper, which has a mass of 38.0 grams, is being swung in a horizontal circle which has a radius of R = 1.35 meters. The rubber stopper is measured to complete 10 revolutions in 8.25 seconds. 4. What is the speed of the rubber stopper? 5. How much force must be applied to the string in order to keep this stopper moving in this circular path at a constant speed? How far will the stopper move during a period of 25.0 seconds? How much work is done on the stopper by the force applied by the string during 25.0 seconds? 8. How much work would be required to lift a 12.0 kg mass up onto a table 1.15 meters high? 9. Abarge is being pulled along a canal by two cables being pulled as shown below. The tension in each cable is T=14,000 N and each cable is being pulled at an angle a = 18.0° relative to the direction of motion as shown. How much work will be done in pulling this barge a distance of 3.0 2 (14 mq Le‘aut) (%Mj o ‘00016 OO"q kilometers? 1 Physics Tutoring - Subeka
10. A car, which has a mass of 1250 kg is moving with a velocity of 26.0 m/sec. What is the kinetic f this car? B i energy of this car im #625 (t(,) ‘421 sfio‘s 11. What will be the kinetic energy of a bullet, which has a mass of 22.0 grams, moving with a velocity of 650 m/s? D.oan oo LS50 fat (L)) Va5t 12. How fast must a 4.40 kg bowling ball move in order to have a kinetic energy of 185 Joules? 1 its=d@advy @RS o) (Fwlg A cart, which has a mass of m = 2,50 kg., is sitting at the top of an inclined plane which is 3.30 meters long and which meets the horizontal at an angle of 6 = 18.5°, \H’l . 13. How long will it take for this cart to reach the bottom of the inclined plane? 14. What will be the velocity of the cart when it reaches the bottom of the incline? 15. What will be the kinetic energy of the cart when it reaches the bottom of the incline? A 5.0 kg mass is initially sitting on the floor when it is lifted onto a table 1.15 meters high at a constant speed. 16. How much work will be done in lifting this mass onto the table? 17. What will be the gravitational potential energy of this mass, relative to the floor, once it is placed on the table? 18. What was the initial gravitational potential energy, relative to the floor, of this mass while sitting on the floor? A crate, which has a mass of 48.0 kg., is sitting at rest at the bottom of a frictionless inclined plane which is L = 2.85 meters long and which meets the horizontal at an angle of 8 = 31.5°. A force Fis applied so as to push the crate up this incline at a constant speed. . 4%. R n3E - 2.09 ([t S| PYEE s 19. What is the magnitude of the force F required to push the crate to the top of the incline at a constant speed? 20. How much work will be done in pushing the crate to the top of the incline? 21. What is the height of this incline? 3, /&4 i 3(.5 22. What will be the GPE of this crate when it reaches the top of the incline? 2 Physics Tutoring - Subeka
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