3. To loosen a rusty nut, a 20.00-N force is applied to the wrench handle at angle o=40° and at a distance of 0.25 m from the nut. Find the magnitude and direction of the torque applied to the nut. nut R R

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Chapter10: Rotational Motion And Angular Momentum
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3. To loosen a rusty nut, a 20.00-N force is applied to the wrench handle at
angle o=40° and at a distance of 0.25 m from the nut. Find the magnitude and
direction of the torque applied to the nut.
nut
Transcribed Image Text:3. To loosen a rusty nut, a 20.00-N force is applied to the wrench handle at angle o=40° and at a distance of 0.25 m from the nut. Find the magnitude and direction of the torque applied to the nut. nut
1. Assume the Earth to be a sphere of uniform density. Calculate:
a. its moment of inertia
b. its rotational kinetic energy
c. Suppose that these energy could be harnessed for our use. For how long
could the Earth supply 1.0 kW of power to each of the 7.8 x 10° persons
on Earth?
2. A 25-kg child stands at a distance r=1.0m from the axis of a rotating
merry-go-round. The merry-go-round can be approximated as a uniform solid
disk with a mass of 500 kg and a radius of 2.0 m. Find the moment of inertia
of this system.
Transcribed Image Text:1. Assume the Earth to be a sphere of uniform density. Calculate: a. its moment of inertia b. its rotational kinetic energy c. Suppose that these energy could be harnessed for our use. For how long could the Earth supply 1.0 kW of power to each of the 7.8 x 10° persons on Earth? 2. A 25-kg child stands at a distance r=1.0m from the axis of a rotating merry-go-round. The merry-go-round can be approximated as a uniform solid disk with a mass of 500 kg and a radius of 2.0 m. Find the moment of inertia of this system.
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