A car accelerates uniformly from rest. Ignoring air friction, when does the car require the greatest power? (a) When the car first accelerates from rest, (b) just as the car reaches its maximum speed, (c) when the car reaches half its maximum speed. (d) The question is misleading because the power required is constant. (e) More information is needed.

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Q: Suppose 65 passengers with an average mass of 75kg are transported by a ski lift to a height of…

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Q: A fully loaded, slow-moving freight elevator has a cab with a total mass of 1600 kg, which is…

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Q: Refer to the figure. A box is pushed 8 m upward with a force of 75 N in a rough inclined plane.…

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Q: Without pedaling, the rider rides down a 3.0% slope with constant speed of 7.0 m/s. With how much…

A: Slope = 3% therefore, θ = Tan-1(0.03) = 1.718oV = 7 msmass (m) = 80 kg

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Q: What distance can a crane lift a 55.0 N box, if it expends work of 2.00 x 104 Joules?

A: given ;    force, F = 55.0 N , work done = 2.00 x 104  Joules  formula used;     W = F x d   where,…

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Q: Q.2 A 1.00 x 10*3 kg elevator car carries a maximum load of 8.00 x 10*2 kg. A constant frictional…

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Q: What minimum horsepower must a motor have to be able to drag a 380 kg box along a level floor at a…

A: The frictional force acting between box and floor is, F=μmg             (I)…

Q: A car accelerates uniformly from rest to 24.2 m/s in 8.46 s along a level stretch of road. Ignoring…

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A: Since you have posted a question with a multiple sub parts, we will solve first three sub - parts…

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A: W=12mv2f-mgh-12mv2i

Q: What average mechanical power (in W) must a 60.0 kg mountain climber generate to climb to the summit…

A: solution as

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Q: A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or…

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Q: If a car (m = 1200 kg) generates 18 hp when traveling at a steady 90 km/h, what must be the combined…

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Q: If it takes 4.00 J of work to stretch a Hooke's-law spring 5.0 cm from its unstressed length,…

A: Work done to stretch the spring from its unstretched length to 5 cm  = 4 Joules Using, formula for…

Q: The power delivered by a constant  force is given by P=F⃗·v⃗,  The power exerted by gravity as it…

A: The power delivered by the force is given by,

Q: Suppose a 825-kg car can produce a useful power output of 45.5 hp (1 hp = 746 W). How long, in…

A: