The average force exerted

(a) The Eskimo pushes the same 50.0-kg sled over level ground with a force of 1.70 × 102 N exerted horizontally, moving it a distance of 5.90 m over new terrain. If the net work done on the sled is 2.90 x 102 J find the coefficient of kinetic friction. (b) Repeat the exercise with the same data, finding the coefficient of kinetic friction, but assume the applied force is upwards at a 40.0° angle with the horizontal.

A car's bumper is designed to withstand a 7.20 km/h (2.0 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 0.240 m while bringing a 870 kg car to rest from an initial speed of 2.0 m/s. (Enter a number.)

A baseball player exerts a force of 80N on a ball for a distance of 0.7m as he throws it. If the ball has a mass of 0.15kg, what is its velocity as it leaves his hand (in m/s)? a. 25.3 b. 22.8 О с. 20.7 d. 27.3 O e. 17.9 Next page

Suppose a box of mass 5 kg is initially at rest on a frictionless horizontal surface. A constant force of 10 N is applied horizontally to the box for 4 seconds, and then a 7 N force of the same direction is applied for another 4 seconds. (a) Find the total distance that the box traveled. (b) Find the total work done on the box.

Calculate how much labor you and a buddy put in when each of you pushes a vehicle that has run out of gas. Assume that you and your buddy each exert a horizontal force of 200 N over a distance of 100 m.

A volleyball player starts a serve by throwing the ball vertically upward. The 240g volleyball comes to rest at its maximum height. The server then hits it and exerts an average horizontal force of magnitude 6.2 N on the ball. Determine the speed of the ball after the player hits it if the average force is exerted on the ball for 600 ms.

You are playing volleyball. Your hand was in contact with the ball for 3milliseconds during the rally. The 1000gram ball leaves your hand with a speed 2.4m/s. Calculate the average force of you exerted on the volleyball.

During a severe storm in Palm Beach, FL, onJanuary 2, 1999, 31 inches of rain fell in a period of nine hours.Assuming that the raindrops hit the ground with a speed of10 m>s, estimate the average upward force exerted by one squaremeter of ground to stop the falling raindrops during the storm.(Note: One cubic meter of water has a mass of 1000 kg.)

A coin that is tossed straight up into the air. After it is released, it moves upward, reaches its highest point and falls back down again. Use one of the following choices (A through G) to indicate the acceleration of the coin during each of the stages of the coin's motion described below. Take up to be the positive direction. Answer choice J if you think that none is correct. A. The acceleration is in the negative direction and constant. B. The acceleration is in the negative direction and increasing. C. The acceleration is in the negative direction and decreasing. D. The acceleration is zero. E. The acceleration is in the positive direction and constant. F. The acceleration is in the positive direction and increasing. G. The acceleration is in the positive direction and decreasing. The coin is mo downward. OE OF OJ O C O A OD OG O B