during the slide? average friction
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answer c only.... value for a and b ..i.e., potential and kinetic energy change are -2940 J and 392 J....
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- A 1.5 kg ball is thrown upward with a velocity of 6 m/s. a). What is the kinetic energy of the ball as it is thrown upward? b). What is the gravitational potential energy of the ball when it reaches its highest point? c). To what height above the thrower’s hand will the ball rise? (for c only, round answer to nearest hundredth).1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?1. a brick with mass 30 kg rests a top a 12 m tall wall. What is the brick's gravitational potential energy relative to the ground? a. 2400 J b. 360 J c. 240 J d. 3600 J 2. A brick with mass 20 kg rests atop a 12 m tall wall. The brick is nudged off the wall, and falls to the ground. How fast will the brick be going as it hits the ground? Neglect air resistance. a. 12 m/s b. 120 m/s c. 0 m/s d. 15.5 m/s
- ... question 8 please thanks../....Suppose a 1300-kg elevator car is lifted a distance 45 m by its cable at a constant speed, assuming the frictional force on the elevator has a constant value of 1350 N. 1.Calculate the work done on the elevator by its cable, in joules. 2.Calculate the work done by the gravitational force on the elevator, in joules, during this process. 3.Calculate the total work done on the elevator, in joules.A 50 kg skier leaves the top of a 10 m high frictionless slope (point "a") from rest and reaches the bottom of the slope (point "") with a speed v,. He subsequently continues sliding on level ground to a full stop to a point "c" due to friction (i.e. 0.2 on the level ground). a. Write an expression for the total mechanical energy of the skier at point "a". b. Write an expression for the total mechanical energy of the skier at point "b". c. Use the Work-Energy Theorem to determine the work done from point “b" to point “c".