Recent content by AD_3

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    Calculating Mechanical Energy Lost to Friction on Ski Slope

    Homework Statement How much mechanical energy is lost to friction if a 58.1-kg skier slides down a ski slope at constant speed of 12.1 m/s? The slope is 122.3 m long and makes an angle of 10.3° with respect to the horizontal. Homework Equations Emec=KE+PE The Attempt at a Solution...
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    A particle is moving along the x-axis subject to the potential energy function

    Homework Statement A particle is moving along the x-axis subject to the potential energy function U(x) = 1/ x + x2 + x – 1. Determine the x-component of the net force on the particle at the coordinate x = 3.67 m. Homework Equations delta U=-∫F(x)*dx The Attempt at a Solution I tried to...
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    A grandfather pulls his granddaughter, whose mass is 20.5 kg

    Oh okay I understand. Thank you! I got 30.1 deg
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    A grandfather pulls his granddaughter, whose mass is 20.5 kg

    So once I set those equal and solve for h do I use sin(theta)=o/h to solve for theta?
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    A grandfather pulls his granddaughter, whose mass is 20.5 kg

    You are right I overlooked those equations. I know KE=.5mv^2 and I think PE=mgh. Is the PE when the grandfather holds her equal to the KE at the bottom?
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    A grandfather pulls his granddaughter, whose mass is 20.5 kg

    Homework Statement A grandfather pulls his granddaughter, whose mass is 20.5 kg and who is sitting on a swing with ropes of length 2.57 m, backward and releases her from rest. The speed of the granddaughter at the bottom of the swinging motion is 2.61 m/s. What is the angle (in degrees...