A 7.80 x 10 3 kg bullet is initially moving horizontally at v, = + 630 m/s. Along comes a superhero and exerts a constant force F in the opposite direction as the bullet is displaced 4.80 x 10-2 m. As a result, the bullet comes to a stop. What is the work done by the superhero in stopping the bullet? {Consider the change in kinetic energy} 3-1,890 J O- 1,550 J 2-1,240 J O-2,370 J O-1,396 J
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- A constant 82.5-N force acts on a 6.54-kg box. The box initially is moving at 20.5 m/s in the direction of the force, and some time later the box is moving at 57.7 m/s. Determine the work (in J) done by this force. You may assume that only one force acts on the box.9Please help me with this question. Thank you
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- For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. When apply the following energy principle to this question, assuming the system is athlete+barbell+earth, which of the energy term is positive? Select all apply. ΔK + ΔUg + ΔUsp + ΔEth + ΔEch = Wexternal ΔK ΔUg ΔUsp ΔEth ΔEch WexternalA 3.5-kg object falls vertically downward in a viscous medium at a constant speed of 1.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 50 cm? Question 11 options: +2.0 J -8.5 J +17 J −17.0 J −32 JA 65.70 kg baseball player begins his slide into second base when moving at a speed of 6.090 m/s. The coefficient of friction between his clothes and the earth is 0.7480. How much work (in Joules) is done on the runner as he slides to a stop?
- The only force acting on a 2.0 kg canister that is moving in an xy plane has a magnitude of 5.0 N.The canister initially has a veloc- ity of 4.0 m/s in the positive x direction and some time later has a velocity of 6.0 m/s in the positive y direction. How much work is done on the canister by the 5.0 N force during this time?"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 16 m, his speed is 5.0 m/s. His mass, including the propulsion unit, has the approximately constant value of 136 kg. Find the work done by the force generated by the propulsion unit.(8c7p19) A cord is used to vertically lower an initially stationary block of mass M = 45 ką at a constant downward acceleration of q/7. When the block has fallen a distance d = 4.5 m, find the work done by the cord's force on the block. Submit Answer Tries 0/5 Find the work done by the weight of the block. Submit Answer Tries 0/5 Find the kinetic energy of the block. Submit Answer Tries 0/5 Find the speed of the block. Submit Answer Tries 0/5