Answer to Question #220052 in Mechanics | Relativity for Alex

Question

a. A child of mass 30 kg slides from rest down a wooden pole by a distance of

3.0 m. Calculate the average force of friction acting on the child if her speed is

2.0 ms^-1 when she hits the ground. Take g=10 ms^-2

b. The average angular acceleration of a stone lodged in a rotating car wheel is

100 rads^-2. What will the stone’s final angular speed be after 3.0 s, if it starts

from rest? Also calculate its angular displacement during this time.

c. A star having rotational inertia of 10 x10⁴⁸ kgm² is rotating at an angular speed

of 2.0 revolutions per month about its axis. The only force on it is the force of

gravitation. When its nuclear fuel is exhausted, it shrinks to a neutron star

having rotational inertia of 6.0 x10⁴⁸ kgm² Determine the angular speed

of the neutron star in revolutions per month.

Answer 1

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