A boy on a swing is pulled to a position 2.34 m off the ground and released. At the fastest and lowest pointmSof the swing the boy is 0.50 m off the ground and travelling 3. The percent efficiency of this swingsystem is:A) 70%B) 25%C) 50%D) 10%A ball is dropped from a height of 3.0 m. As it fallsA) its gravitational potential energy increases and its kinetic energy increases.B) its gravitational potential energy decreases and its kinetic energy increases.C) its gravitational potential energy decreases and its kinetic energy decreases.D) its gravitational potential energy increases and its kinetic energy decreases.

Approach to solving the question:Concept of Potential energy and kinetic energyDetailed…

Answered: A boy on a swing is pulled to a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A spring has a constant 9f 200N/m. It is compressed 3cm and a small stone of 0.500kg is resting against the end of the spring. When the spring is released the stone is propelled forwards. a) find the initial energy for the system b) find the stones kinetic energy as it leaves the spring c) find the stones speed
3. A 26.00-kg child initially at rest slides down a playground slide from a height of 3.20 m above the bottom of the slide. If her speed at the bottom is 2.80 m/s, how much energy is lost due to friction? J cci16 f16 cci16 ceil6 cci
Consider a rope lowering a mass m=2.45kg at a constant speed v=8.73 m/s down a distance of d=5.72 m as shown in the figure below. c) What is the work done on the mass by the tension in the rope as it descends a distance d=5.72 m? d) What is the change in kinetic energy of the mass as it descends a distance d=5.72 m?
Suppose you are biking at a constant speed up a road inclined at 5° above the horizontal. You need to bike up this hill for 200 m in 2 minutes or less. There is an average drag force of 25 N as well. Calculate the minimum amount of power in hp your body must provide in order to make it up this hill in time. Assume 80 kg total mass of yourself and bike and 25% energy efficiency in your body. Define a system and draw energy state diagrams as part of your solution. Draw any necessary FBDs for forces. B
1. A student of mass 40 kg caries a bag weighing 5000g from the ground floor to his class on the first floor that is 700 cm high. The work done by the boy is = 2. The above diagram shows a cyclist at different positions as she cycles over a humpback bridge. The cyclist has maximum Kinetic Energy at • and maximum Potential energy at 3. A body moves a distance of 15 m along a straight line under the action of 25 N force. If work done is 45 J, then angle between the force and direction of motion of the body will be = 4. How much is the work done in pulling up a block of wood weighing 300 N for a length of 300 cm on a smooth plane inclined at an angle of 35° with the horizontal? Answer =
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.
US-2 A spring has a force constant K=12.5N/m. a) Find the energy stored in the spring if it is stretched x₂-0.150m from its unloaded length. b) Find the energy stored in the spring if it is stretched x₁-0.300m from its unloaded length. c) Find U₁U₁, the ratio of the energies you found in parts a) and b). d) The ratio x/x₁ is 2/1. Why is this not the same as your answer for part c)?

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