Answer:Hollow sphere
Explanation:
Given
same mass for solid and hollow sphere
same 
before they start up incline
Moment of inertia of solid Sphere
Moment of inertia of hollow sphere
Conserving Energy at bottom and top point for solid sphere
kinetic energy +Rotational Energy=Potential energy
for pure rolling 
For hollow sphere
therefore height gained by hollow sphere is more
Answer:
Sorry to tell you this but there’s no answer for that
Explanation:
Yes. An object of large mass is pulled down onto a surface with a greater force than an object of low mass and, as a consequence, there is greater friction between the surface of the heavy object than between the surface of the light object.
-- Radio waves. (To hear the weather while I'm waking up.)
-- Light waves. (To see where the dog is so I don't step on him.)
-- Infrared waves. (To make my toast for breakfast.)
-- Microwaves. (To heat my oatmeal for breakfast. Also when I go in to my job as a microwave communications engineer.)
Answer:
Commutator is a ring which reverse the direction of current in AC circuit so that the coil connected to it will continuous to move in the same direction.
Explanation:
In motors there exist a coil which is rotated due to torque of magnetic field when current flow through it. Since AC current is used to run the motor so we know that AC current changes its direction after half cycle.
So here commutator plays an important role to reverse the direction of current after every half cycle so that the current goes in same direction always into the coil.
This will produce a constant direction torque on the coil so that it will rotate in same sense always.
So commutator role is to provide same direction current to the coil by reversing its direction after every half cycle
