missouri,instructure com Missouri Instructure com 12. Missouri,instructure.com A

Question

missouri,instructure com Missouri Instructure com 12. Missouri,instructure.com An L D Question 1 2 pts Start the simulation and click Pause. Check the buttons for "Potential Energy Reference" and Grid." CIick and drag the blue dot at the bottom of the track until it reaches the ground (reference line) as shown below. Click and drag to place the skater (mass 75 kg) on the track at the 6 m height. Make sure the coefficient of frction aound under Track Friction7 is set to zero. Click raear Heat before every single run. In all calculations take g 9.81 m/s2. Click the play button and look at the motion of the skater. What type of energy does the skater have at the starting point? none o gravitational potential energy kinetic energy elastic potential energy

Explanation / Answer

(8) Mass of the skater = 75 kg.

Now, in one single run the skater rises 5.2 meter on the right side of the track [You have clicked this height as 10.3 m in Question (7), please check that].

Now initial potential energy of the skater, P1 = mgh1 = 75*9.81*6 = 4414.5 J

Final Potential energy of the skater after completion of one run, P2 = 75*9.81*5.2 = 3825.9 J

So, change of gravitational potential energy of the skater = P2 - P1 = 3825.9 - 4414.5 = -588.6 J

So, third option is the correct answer.

(9) Work done by the friction = change in potential energy = -588.6 J

Hence FIRST OPTION is the correct answer.

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