標題:
PHY momentum 急!!!!!
1. A 5kg mass is raised a distance of 4m above the earth by a vertical force of 80Na) Find the work done by the forceb) Find the gain in PE of the massc) Find the final KE of the mass fi it was originally at rest2. A 60Kw outboard motor, operating flat out can drive a speedboat at 11m/s. What is the forword... 顯示更多 1. A 5kg mass is raised a distance of 4m above the earth by a vertical force of 80N a) Find the work done by the force b) Find the gain in PE of the mass c) Find the final KE of the mass fi it was originally at rest 2. A 60Kw outboard motor, operating flat out can drive a speedboat at 11m/s. What is the forword thrust(force) of the motor 3. A golfer hits a golf ball, imparting to it an initial speed of 50m/s directed 30 degrees above the horizontal. Assuning that the mass of the ball is 46g and the club and the ball are in contact for 1.0ms.Find a) the impulse imparted to the ball b) the average force exerted on the ball by the club c) the work done on the ball. 4, A 2000kg car moves with inital speed 25m/s. It is stopped in 60m by brakes.What is the force applied by the brakes?
最佳解答:
1. (a) Work done= 80 x 4 J = 320 J (b) Gain in potential energy = 5g x 4 J = 200 J (take g to be 10 m/s2) (c) Kinteic energy = (320 - 200) J = 120 J 2. Thrust of motor = 60000/11 N = 5455 N 3. (a) Impulse = (46/1000) x 50 N.s = 2.3 N.s (b) Average force = 2.3/10^-3 N = 2300 N (c) WOrk done on the ball = increase in kinetic energy = (1/2).(46/1000).50^2 J = 57.5 J 4. Initial kinetic energy of car = (1/2).(2000).(25)^2 J = 625 000 J Force applied by the brakes = 625000/60 N = 10400 N
其他解答:FAD2A23AB937987B
PHY momentum 急!!!!!
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發問:1. A 5kg mass is raised a distance of 4m above the earth by a vertical force of 80Na) Find the work done by the forceb) Find the gain in PE of the massc) Find the final KE of the mass fi it was originally at rest2. A 60Kw outboard motor, operating flat out can drive a speedboat at 11m/s. What is the forword... 顯示更多 1. A 5kg mass is raised a distance of 4m above the earth by a vertical force of 80N a) Find the work done by the force b) Find the gain in PE of the mass c) Find the final KE of the mass fi it was originally at rest 2. A 60Kw outboard motor, operating flat out can drive a speedboat at 11m/s. What is the forword thrust(force) of the motor 3. A golfer hits a golf ball, imparting to it an initial speed of 50m/s directed 30 degrees above the horizontal. Assuning that the mass of the ball is 46g and the club and the ball are in contact for 1.0ms.Find a) the impulse imparted to the ball b) the average force exerted on the ball by the club c) the work done on the ball. 4, A 2000kg car moves with inital speed 25m/s. It is stopped in 60m by brakes.What is the force applied by the brakes?
最佳解答:
1. (a) Work done= 80 x 4 J = 320 J (b) Gain in potential energy = 5g x 4 J = 200 J (take g to be 10 m/s2) (c) Kinteic energy = (320 - 200) J = 120 J 2. Thrust of motor = 60000/11 N = 5455 N 3. (a) Impulse = (46/1000) x 50 N.s = 2.3 N.s (b) Average force = 2.3/10^-3 N = 2300 N (c) WOrk done on the ball = increase in kinetic energy = (1/2).(46/1000).50^2 J = 57.5 J 4. Initial kinetic energy of car = (1/2).(2000).(25)^2 J = 625 000 J Force applied by the brakes = 625000/60 N = 10400 N
其他解答:FAD2A23AB937987B
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