On a frictionless canvas a 5.5 kg block can slide along the x-axis and is subjected to a force of 80 N in the +x direction while it travels 10 m. The block is initially at rest. With work-energy theorem, compute the final speed after the block has moved 10 m
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- A horizontal spring is stretched 10 cm and then released from rest. Will the spring ever stretch a distance greater than 10 cm? Explain why or why not using the idea of energy conservation.A 1900 kg car moves down a level highway under the actions of two forces: a 960 N forward force exerted on the drive wheels by the road and a 910 N resistive force. Use the work-energy theorem to find the speed of the car after it has moved a distance of 32 m, assuming that it starts from rest m/sIn the pitching motion, a baseball pitcher exerted an average horizontal force of 80 N against the 0.15 kg baseball while moving it through a horizontal displacement of 2.2 m before he released it. How much work did the pitcher do to the baseball as a result of this force? If the baseball’s velocity at the start of the pitching action was zero, how fast was the ball moving at the instant of release?
- A car with mass 1520 kg is traveling down the highway at a speed of 18 m/s when the driver slams on the brakes due to an accident up ahead. The car eventually comes to rest.According to the work-energy theorem the work is related to the change in kinetic energy, Wnet = Δ KE = KEfinal - KEinitial.(a) Using the work-energy relationship, determine how much net work is done on the car from the brakes? Report the magnitude of the the work (positive value) even though the work from brakes will be negative since the car is slowing down._____ J(b) The brakes apply a force of 24000 N to the car in order to make it stop. Using the fact that W = F d and the fact that the you found the work done (magnitude) by the brakes in part (b), determine the stopping distance, d, of the car.____ mA 2 kg object initially at rest is pushed along a frictionless surface by a constant force of 10 N for a distance of 5 meters. Calculate the work done on the object and its resulting final velocity.A sprinter with a mass of 55 kg is running at a speed of 3.8 m/s. In a burst of speed to win the race, she increases her speed to 5.9 m/s. Determine the work that the sprinter does to increase her speed.
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