3. In which case would more power be needed?a. In lifting up a weight of 100kg at a constant speed of 3m/sb. In lifting up a weight of 100kg at a velocity 3m/s but accelerating upward 0.5m/sc. In lowering the weight at a constant speed of 3m/sd. In lowering the weight at a velocity of 3m/s and accelaration of 1m/s?

We know Power(P)=Force(F)×Velocity(v) when lifting up with an acceleration (a) then force…

Answered: 3. In which case would more power be…

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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Similar questions

Assume that a man lifts 800 kg, the mass of half of the car, and a height of 0.5 m. What is the gravitational potential energy supplied by Wonder Woman when lifting the back of the car? PE= mgh= (800kg)(9.81m/s2)(0.5m)= 3,924 J Calculate the power he exerts when lifting the car over a time interval of 5 seconds. (I just need help with the second half)
9. What is the coefficient of friction between the surfaces if the boy in the above question now pulls the wagon at constant speed up an inclined plane of 5° with a force of 60 N? Assume the force is applied parallel to the surface. If the applied force is again doubled, what is the final speed of the wagon after travelling 10 m under the same condition?
A sports car accelerates from zero to 20 mph In 0.5 s. How long does it take for it to accelerate from zero to 60 mph, assuming the power of the engine to be independent of velocity and neglecting friction? A) 2 s B) 3s C) 4.5 s D) 6 s E) 9 s
8) A 60.0 kg student starts from rest (Point A) and slides 26.0 m down a hill where the average force of friction is 55.0 N. What is her final speed at the bottom of the hill (Point B) if the vertical drop is 17.0 m? 17.0 m 26.0 m B
26 - Two blocks with masses m1 = 2kg and m2 = 6kg are tied together by a light rope, weightless and frictionless reel. The system is freed from its idle state. When a 6kg block hits the ground from a height of h = 4m, what is the speed of a 2kg block that is at ground level first. (g = 10m / s2)A) 6.32m / s B) 5,32m / s C) 2,22m / s D) 6,16m / s E) 4,12m / s
Q5: The man in fig2 pushes on the 70 kg crate with a force of F=150N.Determine the power supplied the man when t-4s.the coefficient of kinetic frietion between the floor and the crate Initially the create is at rest and He = 0.4 F= 150N (a) Fignre 2
44. A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion? 50 W 100 W 200 W 400 W
1. A grandfather clock is powered by the descent of a 4.35 kg weight.(a) If the weight descends through a distance of 0.760m in 3.25 days, how much power does it deliver to the clock?(b) To increase the power delivered to the clock?(b) To increase the power delivered to the clock, should the time it takes for the mass to descend be increased or decreased? Explain and draws.
4. A roller coaster car with its three passengers (a total of 450. kg) is pulled up to the top of a 30.0 meter hill where it is released at a speed of 1.00 meter per second to begin its hurtle down the track toward a 15.0 meter diameter loop the loop at the bottom. Unfortunately the maintenance crew still has some work to do on the old rusty roller coaster track and the average frictional force on the 65.0 meter long angled descent is 595 N. Luckily the loop the loop portion of the roller coaster track has been recently polished and Teflon coated to reduce friction to practically nothing. What will be the speed of the car at the top of the loop the loop, and will this be enough to have the car stay on the track all the way round the loop?

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