The distance the wagon travels is
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A boy does 465 J of work pulling an empty wagon along level ground with a force of 111 N [31o below the horizontal]. A frictional force of 155 N opposes the motion and is actually slowing the wagon down from an initial high velocity. The distance the wagon travels is _____.
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- A box of mass 4.0 kg is accelerated from rest across a floor at a rate of 2.0 m/s^2 for 9.0 s . a.) Find the net work done on the box. Express your answer to two significant figures and include the appropriate units. W= ________An elevator with total mass of 1,600 kg is moving up ward with constant acceleration. A friction in the system resists the motion with force of 4,000 N constantly. Find how much power is required to lift the elevator at a constant acceleration of 1.0 m/s2 at the instant the speed of the elevator is v = 3 m/s?A man does 4,480 J of work in the process of pushing his 2.70 103 kg truck from rest to a speed of v, over a distance of 25.5 m. Neglecting friction between truck and road, determine the following. (a) the speed v (in m/s) m/s (b) the horizontal force exerted on the truck (in N) N
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- A man does 4,725 J of work in the process of pushing his 2.90 103 kg truck from rest to a speed of v, over a distance of 27.0 m. Neglecting friction between truck and road, determine the following. (a) the speed v (in m/s) ___________m/s (b) the horizontal force exerted on the truck (in N) __________NA mechanic pushes a 2.20 ✕ 103-kg car from rest to a speed of v, doing 5,250 J of work in the process. During this time, the car moves 21.0 m. Neglecting friction between car and road, find the horizontal force exerted on the car.A man does 4,550 J of work in the process of pushing his 3.00 x 103 kg truck from rest to a speed of v, over a distance of 25.5 m. Neglecting friction between truck and road, determine the following. (a) the speed v (in m/s) m/s (b) the horizontal force exerted on the truck (in N)
- A mechanic pushes a 3.30 x 103-kg car from rest to a speed of v, doing 5,460 J of work in the process. During this time, the car moves 27.0 m. Neglecting friction between car and road, find v and the horizontal force exerted on the car. (a) the speed v m/s (b) the horizontal force exerted on the car (Enter the magnitude.)A hummingbird hovers by exerting a downward force on the air equal, on average, to its weight. By Newton's third law, the air exerts an upward force of the same magnitude on the bird's wings. Find the average mechanical power (in W) delivered by a 2.80 g hummingbird while hovering if its wings beat 55.0 times per second through a stroke 3.34 cm long. HINTi cant figure out how to solve work problems with unit vector notation