-1/ points SerPSE8.8.p.009. 3. A light, rigid rod is 72.4 cm long. Its top end i
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Question
-1/ points SerPSE8.8.p.009. 3. A light, rigid rod is 72.4 cm long. Its top end is pivoted on a frictionless horizontal axle. The rod hangs straight down at rest with a small, massive ball attached to its bottom end. You strike the ball, suddenly giving it a horizontal velocity so that it swings around in a full circle. What minimum speed at the bottom is required to make the ball go over the top of the circle? m/s -1/ points SerPSE8.8.p.0.12 soln. 4. A sled of mass m is given a kick on a frozen pond. The kick imparts to it an initial speed of 2.10 m/s. The coefficient of kinetic friction between sled and ice is 0.145. Use energy considerations to find the distance the sled moves before it stops. mExplanation / Answer
3)
The initial total energy {kinetic} energy of the ball is
1/2 mv^2 .
When it reaches the top most point its total enedrgy is
1/2 mv^2 + mgh . The minimum speed at the top is zero.
hence the total energy at the top is mg h = mg (2L}
1/2 mv^2 = mg (2L}
v^2 = g (4L} = 4*9.8*0.724
v^2 = 28.38
v = 5.327 m /s
4)
Normal Force = F? = m
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