Ay=52 m Drawing not to scale V=20.0 m/s a) Calculate the snowboarder's mechanical energy at the top of the hill. B)Find the snowboarder's speed at the bottom of the hill.
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- A child with a weight of 110 N swings on a playground swing attached to 1.90 m long chains. What is the gravitational potential energy (in J) of the child-earth system relative to the child's lowest position at the following times? a) when the chains are horizontal. b) when the chains make an angle of 25.0° with respect to the vertical and c)when the child is at his lowest positionA car engine produces a constant power of P = 341 hp. The car and motor have a combined mass of m = 1830 kg. 1.) The car starts from rest, after t=5 seconds, what is the cars speed, you may assume no energy is required to spin the tires. 2.) Assume a dragster of mass m=1000kg can accelerate to cover 450 m and accelerate in 7.2 s from a dead stop, how much horsepower is the engine producing, assuming acceleration is constant?1480 kg car accelerates uniformly from a position of rest to a speed of 95 km/h in 6.0 s. a) Calculate the car's acceleration. b) How far did the car travel during this acceleration? b) How much work was done by the car during this 6.0 s?
- a) Calculate the work done when a 5.0 kg bag of apples is lifted 1.2 off the ground. b) If this bag of apples is carried at this height to the checkout counter, is any work done? Justify your choice. c) Calculate the power developed when the action of lifting the apples takes 2.0 s.2. A 5.2-kg box slides a distance of 16.0-m. If the coefficient of kinetic friction is 0.30, what is the work done by the frictio" 6 d x244.64 J ✓cci 6 ccilo 16 cci16 ceizQUESTION 16 A crate of mass, m, slides down a plane inclined at an angle, 0, to the horizontal for a distance x down the incline. If the coefficient of kinetic friction between the inclined surface and the crate is µk. what is the work done by friction? a. -Hkmgxcose b. -mgxcose C. -mgxcose/µk d. -µkmgxtane e. -mgxsin0
- A 65.0-kg file cabinet of is sliding down a rough ramp for a distance of 5.00 m as shown. The friction force on the box is 75.0 N. The cabinet starts from rest. What is the initial kinetic energy of the cabinet at the top of the ramp, in Joules? Use g = 10.0 m/s2.1. A 23.0 kg child is playing on a swing with a length of 2.5 m. If the swing starts from rest and makes an angle of 40.0◦ with the vertical at the top of the swing, a) determine the child’s speed at the bottom of the swing neglecting friction. b) If the swing has a speed of 2.8 m/s at the bottom, determine the work done by friction during the downswing and, bonus) assuming the force of friction is constant, determine the maximum angle the swing attains on the upswing after passing through the bottom. Hint: Use the approximation that cos θ ≈ 1 − 1 2 θ 2 for angles given in radians.Answer this question in GRESA format. Given Required Equation Solution and Answer
- An athlete throws a 1.5 kg ball with a horizontal speed of 9 m/s, from a height of 4.8 metres above the ground. a) Calculate the kinetic energy, gravitational potential energy and total mechanical energy of the ball at its starting position. b) Calculate the maximum speed attained by the ball, just as it reaches the ground's surface.#1Conservation of Energy When Work is Done Whiteboard Problems (Page 10):917 \ 1. A 10.0 kg block rests at the top of an incline that is 4.00 m high and 5.00 m long. A) Find the potential energy of the block when it is at the top of the incline. B) What is the speed of the block at the bottom of the incline, if it is frictionless? C) If the incline is not frictionless, and the block experiences a constant 10.0 N force of friction as it moves down the incline, find the speed of the block at the bottom.