Ahollow spherical shell with mass 1.95 kg rolls without slipping down a slope that makes an angle of 39.0 ∘ with the horizontal. find the minimum coefficient of friction μ needed to prevent the spherical shell from slipping as it rolls down the slope.

Awind turbine is initially spinning at a constant angular speed. as the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.173 rad/s2. after making 2870 revolutions, its angular speed is 132 rad/s. (a) what is the initial angular velocity of the turbine? (b) how much time elapses while the turbine is speeding up?

Gunpowder residue is most likely to show up where on a shooters hands

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?