7.-(2 points SerPSE9 8 P.017 My Notes Ask Your A smooth circular hoop with a rad

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7.-(2 points SerPSE9 8 P.017 My Notes Ask Your A smooth circular hoop with a radius of 0.400 m is placed flat on the floor. A 0.375-kg particle slides around the inside edge of the hoop. The particle is given an initial speed of 7.50 m/s. After one revolution, its speed has dropped to 5.50 m/s because of friction with the floor. (a) Find the energy transformed from mechanical to internal in the particle-hoop-floor system as a result of friction in one revolution. (b) What is the total number of revolutions the particle makes before stopping? Assume the friction force remains constant during the entire motion. rev . -/1 points SerPSE9 8 P012 soln. My Notes Ask Your A sled of mass m is given a kick on a frozen pond. The kick imparts to it an initial speed of 1.90 m/s. The coefficient of kinetic friction between sled and ice is 0.110. Use energy considerations to find the distance the sled moves before it stops. Nedise OAk Your Teacher 9. -1 points SerPSE9 8 P.029.wi My Notes Ask Your A 735-N Marine in basic training climbs a 8.0-m vertical rope at a constant speed in 7.75 s. What is his power output? Need Help? Warech

Explanation / Answer

Only one question can be posted as per chegg guidelines

a)

The energy transformed from mechanical to internal

W = (1/2)m[u2- v2] =(1/2)*0.375*(7.52-5.52)

W=4.875 J

b)

Total number of revolutions made before stopping

n=(0.5*0.375*7.52/4.875=2.16 rev

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