Astudent holds a bike wheel and starts it spinning with an initial angular speed of 9.0 rotations per second. the wheel is subject to some friction, so it gradually slows down. in the 10.0 s period following the inital spin, the bike wheel undergoes 65.0 complete rotations. assuming the frictional torque remains constant, how much more time δ t s will it take the bike wheel to come to a complete stop?

Explanation:

As we know that the angular acceleration of the wheel due to friction is constant

so we can use kinematics

so we have

now time required to completely stop the wheel is given as

now time required to stop the wheel is given as

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask