a 65kg cyclist on a 15kg bicycle starts from rest and increases his speed to 12m/s in 20s a) what is the power output? B) if the cyclist provided an average power of 400w, what is the efficiency of the bi
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a 65kg cyclist on a 15kg bicycle starts from rest and increases his speed to 12m/s in 20s
a) what is the power output?
B) if the cyclist provided an average power of 400w, what is the efficiency of the bi
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- Problem 68A sled of 50 kg mass moves along a smooth horizontal surface at 7 m/s. The sled encounters a rough spot that exerts a force of -90 Nt on the sled. Calculate: a) What is the acceleration of the sled? b) Calculate how much work is done by the frictional force on the sled if the patch is 15 m in length. c) What is the sled's final velocity as it leaves the rough spot?A 155g baseball is thrown so that it acquires a speed of 35m/s . a) What is it's kinetic energy . b) What was the net work done on the ball to make it reach this speed, if it started from rest .
- 3. A student drags a 3 kg box 5 m across a rough floor with a force of 40 N. A frictional force of 10 N resists the motion of the box. A) Calculate the work done by the student. B) Calculate the work done by friction. C) Determine the net work done on the box. D) If the box started from rest, how fast is it going at it approaches 5 m? has a yelocity of 8Worker A lifts a 50kg mass vertically upward a distance of 10 meters in a time of 10 seconds. Worker B lifts a 20kg mass vertically upward a distance of 5 meters in 1 second. Calculate: a.) which worker did more work. b.) which worker had more power.A car engine produces a constant power of P = 341 hp. The car and motor have a combined mass of m = 1830 kg. 1.) The car starts from rest, after t=5 seconds, what is the cars speed, you may assume no energy is required to spin the tires. 2.) Assume a dragster of mass m=1000kg can accelerate to cover 450 m and accelerate in 7.2 s from a dead stop, how much horsepower is the engine producing, assuming acceleration is constant?
- How much work can a 1950 Watt motor do in 15 min? Express your answer in Joules.A hydroelectric generator converts kinetic energy of water into electrical energy. Each second 2264 m of water passes over a waterfall 191 m high and the generator is only 78 % efficient: (Phe mass of 1 m? of water is 10oo kg.) Pa) What is the total energy available 2b) What is the power generated WA playground slide has a height of 4.5m amd is frictionless. A 30 kg child pushes off from the top of the slide so that they have a speed of 5.5 m/s at the fop of Hhe slide. a) What's the child's speed at the bottom of the slide? b) After the bottom of the slide, child skids along a rough patch of ground If the rough patch is 2.2 m the friction an the child when they veach the end of the rough patoh? c) Imagine the playgronnd had a spring (K= 755 N/m) at the end of the patch. If the child were to collide, how muuh wonla they Compress before returning to rest? that has a coefficient of friction Mk= 2.5 long, how mnch work is done by