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- A. Calculate the work done by the force of gravity when a 7.0 kg object is lifted to a height of 46.0 m above the ground.B. Calculate the velocity with which the object strikes the ground if dropped from that height, using the principle of conservation of energy.C. Calculate the kinetic energy (KE) and the potential energy (PE) of the object at apoint halfway on the path (i.e. at a height of 23.0 m) after it is dropped. To do this, you need to find the object's velocity at that position using an equation of motion. What is the total energy of the object at that point? Does this verify the principle of conservation of energy?8. A ball has a 17 J of kinetic energy and its mechanical energy is 25 J. Find the potential energy of the ball. a. b. If the ball has a mass of 3.2 kg, what is its height above the ground? c. What is the speed of the ball?3. What is the potential energy formula? a. What is the unit of measurements that each has to be in? b. What is the potential energy of a 350 kg ball sitting at a hight of 3 m?
- 9 Tell me what you want to do O Editing v A v Ev Ev E E E A Styles v O Find v Reuse Fil Kinetic Energy ½ x mass x velocity? Units: J 1. Calculate the potential energy of a rock with a mass of 5 kg while sitting on a cliff that is 30 m high. 2. Calculate the potential energy of an object with a mass of 15 kg while sitting on a shelf that is 20 m high. 3. Calculate the potential energy of a statue with a mass of 20 kg while sitting on a table that is 2 m high. 4. What distance is a book from the floor if the book contains 195 Joules of potential energy and has a mass of 5 kg? 5. What distance is an object from the floor if the object contains 600 Joules of potential energy and has a mass of 15 kg?. Calculate the potential energy of a 75 Kg boulder sitting at the edge of a cliff that is 210 meters from the ground (yf=0). b. If the boulder is suddenly pushed over the side of the cliff what is the velocity of the boulder when it is 50 meters from the ground?I need help with these questions
- 7. The work done by gravity in lowering a 3.0 [kg] box from an initial height to the ground is 15 [J]. What is the gravitational potential energy at its initial position if the potential energy at the ground is zero? A. zero B. -15.0 [J] C. +15.0 [J] D. +30.0 [J]2. A 3.2 kg ball that is moving straight upward has 17 J of kinetic energy and its total mechanical energy is 25 1. a. Find the gravitational potential energy of the ball. b. What is its height above the ground? c. What is the speed of the ball? d. What will be its gravitational energy when it is at Its highest point above the ground? e. What is the maximum height above the ground? f. What will be its speed Just before it lands on the ground? and Given: quired: ution:4. A 4.21-kg watermelon is released from rest from the roof of an 27.8-m-tall building. a. Calculate the work done by gravity on the watermelon as it falls from the roof to the ground. b. Calculate the net work done on the watermelon as it falls to the ground. Show clearly how you get your answer. Just before it hits the ground, what is the watermelon's kinetic energy? Show clearly how you get your answer. d. Just before it hits the ground, what is the watermelon's speed? (Use energy techniques to answer this.) C.
- 9. Consider a 59kg volleyball player who is jumping to spike the ball. Her 0 position is the bottom of the squat. At take-off, she has 320 J of kinetic energy and 580 J of potential energy. a. How high is her COM at takeoff? b. How fast is she going when she takes off? c. What will the height of her COM be at the highest point of the jump?6. At the moment when a bodybuilder throws a 10.0kg medicine ball, it is exactly 2.0m above the ground and traveling at 5.0 m/s. It reaches a maximum height of 3.0m above the ground and then falls to the ground. Assume that air resistance is negligible. a. What is the potential energy of the ball as it leaves the hands relative to the ground? b. What is the kinetic energy of the ball as it leaves the hands? c. What is the total mechanical energy (kinetic plus potential) of the ball as it left the hands? 1.200 d. What is the total mechanical energy of the shot JUST as it reaches its maximum height? e. What is the potential energy of the shot just as it reaches its maximum height? f. What is the kinetic energy of the shot just as it reaches its maximum height?2. An object has 560 J of potential energy and 890 J of mechanical energy. How much kinetic energy does the object have?. ME = REHPE 560 560 330J= PE olog ertev 3. A slingshot rubber band with a spring constant of 850 N/m was stretched 0.33 m. A 0.4 kg rock was fired from the slingshot after it was released. a. Find the spring potential energy. PE =)2 kx? Z(850X.33) b. What is the kinetic energy of the stone once it was released? PEERE c. What is the velocity of the stone as soon as the slingshot was released?