: A 145 gram golf ball is dropped from height of 5 meters, strikes the ground and rebounds at a speed of 6 m/s. Determine the magnitude of the change of Kinetic Energy in the collision with the floor. O O O 464 Joules 9.28 Joules 4.64 Joules 64 Joules None of these are correct
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- 2. Calculate the speed of the 2kg block at point D. Work is done from A to B, and friction is B to C. It starts from rest and coefficient of friction is 0.1 A Fapp=40N 1.2m B 1.1m 3. The 2kg ball hits the wall and bounces back as shown. Draw the interacting forces. If the contact time was .1 seconds, calculate the force on the ball and wall. -3m/s 1m 4m/sA crane at a construction site lifts a concrete block with a mass of m = 482 kg from the ground to the top of a building with a height of h = 23.9 m. How much work did the motor of the crane do? (Assume zero energy loss in the lifting mechanism due to friction.) -112894 J moter If the duration of the lift was 1.35 minutes, then what was the average power performed by the crane?Problem 4: During an ice show, a 67.5-kg skater leaps into the air and is caught by an initially stationary 82.5 kg skater. Part (a) What is their final speed, in meters per second, assuming negligible friction and that the 67.5 kg skater's initial horizontal speed is 4.25 m/s? Numeric : A numeric value is expected and not an expression. v'= Part (b) How much kinetic energy is lost, in joules? Numeric : A numeric value is expected and not an expression. ΔΚΕ10st Ξ
- The mechanical energy (kinetic+potential) of the system of two colliding objects on a horizontal frictionless surface is conserved. This statement is O Always true for any collision O more information is needed O Always false for any collision1. The sledder shown in figure starts from the top of a frictionless hill (Point A) with an initial speed of 30 m/s and slides down into the valley. What is the final speed at the top of the next hill (Point B)? 30 m/s A 100 m 130 m O 30 m/s We cannot solve this problem without knowing the mass of the sledder. O 17.7 m/s O 12.5 m/s O 23.8 m/s? V m In the above image we see a 3.43 kg box that is moving to the right at 19.5 m/s. The box hits into a rough patch that applies a frictional force of 277 Newtons until the box comes to a stop. time K.E. E.P.E. Joules G.P.E. M.E Initial Joules Joules Joules Final Joules Joules Joules Joules How much work was done on the box by friction? Joules How far would the box travel before coming to a stop? meters
- A car's bumper is designed to withstand a 6.48 km/h (1.8 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 0.255 m while bringing a 850 kg car to rest from an initial speed of 1.8 m/s.When no energy is lost to thermal modes in a collision, the coefficient of restitution is e = 1. This represents the ideal golfing equipment. The legal maximum is e = 0.83. A 200-g clubhead moving at 88 mph strikes a golf ball. The mass of the golf ball is 45 g. What is the efficiency of the shot for e = 1? Round the final answer to one decimal place. Round the final answer to two decimal places.Thanks to recent satellite data, we know that the North American continent is drifting westward at a speed of about 1cm/yr. We can assume that the solid part of a continent is about 50 kilometers thick. Estimate the kinetic energy that the continental US has as a result of this motion.
- A child of mass m starts from rest and slides without fric- 1 tion from a height h along a slide next to a pool (Fig. P8.13). She is launched from a height h/5 into the air over the pool. We wish to find the maximum height she reaches above the water in her projectile motion. (a) Is the child-Earth system isolated or nonisolated? Why? (b) Is therea nonconservative force acting within the system? (c) Define the configuration of the system when the child is at the water level as having zero gravitational potential energy. Express the total energy of the system when the child is at the top of the waterslide. (d) Express the total energy of the system when the child is at the launching point. (e) Express the total energy of the system when the child is at the highest point in her tile motion. (1) From parts (c) and (d), determine her initial projec- I. Figure P8.13Bugs Bunny (m=32 kg) starts at rest atop a h;=33 m tall hill, and then slides down. After that, Bugs: I.) slides into a swing set at the bottom of the hill, which has a R = 11 m long chain. He swings up and over the bar, with the chain managing to stay taut. (Labelled points A, B & C are at the bottom, side and top of the loop respectively.) II.) continues on flat ground, where he then hits a friction patch which is L=41.25 m long, from which he exits (at labelled point D) at speed vD = 17.98 m/s. III.) slides off a cliff that is hp=17 m tall, into a lake. h, D R Part I: (around the swing set) a.) Sketch in the correct directions of all forces that act on Bugs at each of the points A-C. Note: At point A, Bugs has already lifted his feet off the ground. B