A 2000 kg rock rolls down a hillside at 40 m/s and crashes into a tree, where it comes to rest. The tree does not move. How much work was done on the tree by the rock? Explain your reasoning. 1.
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- Please atleast answer this question4. 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.11. How much work does Amanda's car experience compared to Bertha's? Amanda and Bertha are in a car race. Their cars have the same mass. At one point in the race, they both change their speeds by 10 m/s in 2 seconds. Ignore air friction. 2s later 2s later 10 m/s 20 m/s 20 m/s 30 m/s Amanda Bertha a. Amanda's car experiences less work b. Amanda's and Bertha's car experience the same amount of work c. Amanda's car experiences more work. O d. Only Rihanna would know. (Work Work Work Work Work...) 96 alt
- A 11 g particle is moving to the left at 17 m/s. How much net work must be done on the particle to cause it to move to the right at 45 m/s ? Express your answer to two significant figures and include the appropriate units. µA ? W = Value Units Submit Request Answer Provide Feedback Next >A 700 kgkg elevator accelerates upward at 1.4 m/s2m/s2 for 14 mm, starting from rest. A. How much work does gravity do on the elevator? Express your answer with the appropriate units. B. How much work does the tension in the elevator cable do on the elevator? Express your answer with the appropriate units. C.What is the elevator's kinetic energy after traveling 14 mm? Express your answer with the appropriate units.A 70.0 kg skier , starting with a speed of 1.00 m/s skies down a rough 17.0 m high ski hill and then goes up and off a ramp, as shown. a. What is the work done by friction as the skier travels down the hill from the start to the bottom of the hill? b. How high will the skier rise after leaving the bottom ramp? 2 Vo=1.0 m/s H=17.0 m V2=15.0 m/s
- 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".Several physical situations are described below. For each situation, simplify the work-energy equation by canceling any zero terms and any energy terms (whether KE or PE) which are unchanging. Explain each term which gets canceled. A track is constructed by stretching a grooved and pliable material between two lab poles. A metal ball starts from rest at point A and rolls to point B. Friction and air resistance have an effect upon the ball's motion. Simplification of Work-Energy Equation KEi + PEi + Wnc = KEf + PEfA 72.0 kgkg painter climbs a ladder that is 2.75 mm long leans against a vertical wall. The ladder makes a 30.0 ∘∘ angle with the wall. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Work done by several forces. 1. How much work does gravity do on the painter? Express your answer with the appropriate units. Wg= ____________ 2. Does the answer to part A depend on whether the painter climbs at constant speed or accelerates up the ladder? Yes / No