A 15.0 kg fish swimming at 1.10 m>s suddenly gobbles up a 4.50 kg fish that is initially stationary. Ignore any drag effects of the water. (a) Find the speed of the large fish just after it eats the small one. (b) How much total mechanical energy was dissipated during this meal?
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A 15.0 kg fish swimming at 1.10 m>s suddenly gobbles up a
4.50 kg fish that is initially stationary. Ignore any drag effects of the
water. (a) Find the speed of the large fish just after it eats the small one.
(b) How much total mechanical energy was dissipated during this meal?
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- A car's bumper is designed to withstand a 5.76 km/h (1.6 m/s) collision with an immovable object without damage to the body of the car. The bumper cushions the shock by absorbing the force over a distance. Calculate the magnitude of the average force (in N) on a bumper that collapses 0.255 m while bringing a 880 kg car to rest from an initial speed of 1.6 m/s. (Enter a number.) NNotA block of mass 6 kg is given a push so that it moves on a flat surface. After the push, it moves at a speed of 5 m/s. For each question helow, give the answer in SI units -- numerical value only. (a) What is initial kinetic energy? Number J (b) The coefficient of kinetic friction between the block and the surface is .11. What is the magnitude of the net force on the block? Number N (c) What is the magnitude of the acceleration of the block after the push? Number m/s² (d) How far will the block travel before it comes to a stop? Number m (e) What is the net work done on the block in the time period between the initial push and when it came to a stop? Number J (f) What is the change in the kinetic energy of the block from the instant after it was pushed until it came to a stop? Number Remaining Time: J
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