A boat weighing m = 2.5 t develops a maximum speed of vmax = 30 m / s. After turning off the engines for a time t = 30 s, the boat loses half its speed. Determine the power
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A boat weighing m = 2.5 t develops a maximum speed of vmax = 30 m / s. After turning off the engines for a time t = 30 s, the boat loses half its speed. Determine the power
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- A certain rain cloud at an altitude of 1.53 km contains 3.20 ✕ 107 kg of water vapor. How long would it take for a 3.05-kW pump to raise the amount of water from Earth's surface to the cloud's position? yrIn a time of T seconds, a motorcycle can accelerate from rest to the speed v. (a) Determine the amount of time (in terms of 7) required for it to accelerate from v to 6v if the power output remains constant. At = (b) Determine the speed of the motorcycle (in terms of v) 3T after starting. Vf=If a 1300 kg car can accelerate from 30 km/h to 65 km/h in 4.0 s , how long will it take to accelerate from 65 km/h to 95 km/h ? Assume the power stays the same, and neglect frictional losses.
- A 1250 kg sports car accelerates from zero to 30 m/s in 25 s. What is the average power delivered by the car engine? Select one: a. 25.5 kW b. 22.5 kW с. 12.5 kW Previc ormula Sheet, CA-2, T-3, AY Jump to... 20-21 Activ LENGO toA 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?When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 195 hp, estimate the total friction force acting on the car when it is moving at a speed of 30 m/s. One horsepower equals 746 W.
- A car accelerated from rest to a speed of 20 m/s in a time of 5.6 s. The car has a weight of 9000N. Determine the average power needed to accelerate the car.Tarzan swings on a 40.0-m-long vine initially inclined at an angle of 39.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? m/s (b) What is his speed at the bottom of the swing if he pushes off with a speed of 5.00 m/s? m/sA 1.50 × 103-kg car starts from rest and accelerates uniformly to 16.9 m/s in 11.6 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. hp 29.7 (b) Find the instantaneous power output of the engine at t = 11.6 s, just before the car stops accelerating. 0.079670122 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. hp Need Help? Read It
- 9) A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time, answer the following. (a) How many people would it take to run a 3.00 kW electric clothes dryer? _____ people (b) How many people would it take to replace a large electric power plant that generates 800 MW? _____peopleThe electric motor of a model train accelerates the train from rest to 0.830 m/s in 20.5 ms. The total mass of the train is 875 g. (a) Find the minimum power delivered to the train by electrical transmission from the metal rails during the acceleration. W (b) Why is it the minimum power?A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time:(a) How many people would it take to run a 3.00 kW electric clothes dryer?................people(b) How many people would it take to replace a large electric power plant that generates 600 MW?...............people