A 6.38 kg block on a hill is released from rest. The surface is frictionless and the block is going 6.7 m/s at the bottom of the hill. A.) Determine how high the block is at the start. h = my B.) After reaching the bottom the block collides with a 7,140 N/m spring and compresses it 0.19 m. Determine how much thermal energy is generated by the collision with the spring. ATE=
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- Timmy (m=50kg) is at the top of a 7m tall hill. a. What type of energy does he have at the top of the hill? b. What is his potential energy? c. What type of energy does he have at the bottom of the hill? d. What is his speed at the bottom of the hill, after he slides down it? e. The hill has a river at the bottom, that causes two things. First is a vertical drop of 2m, second is a horizontal gap. What distance is the gap if Timmy makes the jump? Here you may also assume that at the bottom of the hill Timmy flies horizontally off.If you have a ball with a mass of 6.00kg, that has an initial velocity of vA=(2.00i + 5.00j)m/s and a final velocity of vB=(-2.00i + 8.00j)m/s, What is the Work done on the ball if the work only changes the kinetic energy? a. 234 Joules b. 117 Joules c. 93 Joules d. -13 Joules e. 95 JoulesA bicycler is moving at 8m/s when they reach the top of a 20m high hill. They coast 15m to the bottom of the hill. They are moving 15m/s when they reach the bottom of the hill. The combined mass of the bicycler and the bicycle is 95kg. a. Calculate the work done by friction on the bicycler. b.Calculate the magnitude of the force of friction acting on the bicycle.
- A basketball of 0.400 kg is drop of a height of 5.00 m to the ground and bounce back to a height of 3.00 m a. On its way down,how much potential energy does the ball lose? b. On its way back,how much potential energy does the ball regain?A 70.5-kg hiker starts at an elevation of 1260 m and climbs to the top of a peak 2800 m high. a.)What is the hiker's change in potential energy? Express your answer to three significant figures and include the appropriate units. b.)What is the minimum work required of the hiker? Express your answer to three significant figures and include the appropriate units.You take a 13kg bag of lead pellets and drop it from 2m above the ground.a. How much gravitational potential energy does the bag have when held 2m above the ground?b. The bag is dropped. Just before it hits the ground, how much kinetic energy does it have?c. How fast is the bag moving just before it hits the ground?d. When it hits the ground, the kinetic energy will be transformed mostly into thermal energy. If 40%of this energy goes into the lead pellets as heat, what will be the increase in temperature of thelead? Assume led has a specific heat capacity of 160J/kg·K.
- A man pulls a 25 kg box in a horizontal fashion with 60N of force over a surface with us = 0.15 and uk = 0.05. a. After pushing it for 10m, how much thermal energy is produced? b. What is the net work done on the system? Draw a FBD.Jacob is riding his bike down a tall hill. At the top of the hill, he has 2800J of potential energy. At the bottom of the hill, when he is going the fastest, his kinetic energy measures 2650J. Which statement below is true? (AKS 7a/DOK 2) 4. A. The total amount of energy at the bottom of the hill cannot equal the amount at the top, because some of the energy is destroyed. B. The total amount of energy at the bottom of the hill cannot equal the amount at the top, because some of the energy is gained. C. The total amount of energy at the bottom is equal to the amount at the top, but he gained some energy as he traveled due to a higher speed. D. The total amount of energy at the bottom is equal to the amount at the top, but some energy was converted into other forms due to friction.An elevator is designed so that when it travels upward, it has constant acceleration from rest to its cruising speed of 2.0 m/s in a time of 4.0 seconds. The elevator has a mass of 625kg. Assume friction is ignored. A. Determine the average power (in W) of the elevator motor while its accelerating upward to its cruising speed. B. Determine the motor power (in W) when the elevator is moving upward at its cruising speed.
- A body moves with increasing speed. Which of the following statements is true? A. The net work done on the body is positive, and the kinetic energy is increasing. B. The net work done on the body is positive, and the kinetic energy is decreasing. C. The net work done on the body is zero, and the kinetic energy is decreasing. D. The net work done on the body is negative, and the kinetic energy is increasing. E. The net work done on the body is negative, and the kinetic energy is decreasing.A box is pulled 2.0 meters along a rough surface at constant velocity using 100 N force inclined at 30° above the horizontal. a.If the force applied, Fa is doubled but the frictional force remains the same (this is unlikely to occur in practice since normal force changes), will the net work be the same? b. Is Fa is doubled with the frictional force unchanged how much kinetic energy would the block have after being pulled 2.0 m?Two children have identical spring-loaded catapults, which contain springs with spring constant k. If Samir compresses the spring in his catapult by a distance x and Mona compresses hers by a distance 2x, how does the work they have done to compress their catapults compare? A. Mona has done 2 times as much work as Samir. B. Samir has done 2 times as much work as Mona. C. They have done the same amount of work. D. Mona has done 4 times as much work as Samir.