A small light cylinder and a large heavy cylinder are released at the same time and roll down a ramp without slipping. Which one reaches the bottom first?
A. Small cylinder
B. Large cylinder
C. Both reach the bottom at the same time.

C. Both reach the bottom at the same time.

Explanation:

For a rolling object down an inclined plane , the acceleration is given below

a = g sinθ / (1 + k² / r² )

θ is angle of inclination , k is radius of gyration , r is radius of the cylinder

For cylindrical object

k² / r² = 1/2

acceleration =  g sinθ  /( 1 + 1/2 )

= 2 g sinθ / 3  

Since it does not depend upon either mass or radius , acceleration of both the cylinder will be equal . Hence they will reach the bottom simultaneously.

According to figures provided by elevator manufacturer Kone, a typical hydraulic elevator in a three-story office building uses 3,800 kilowatt-hours per year, or about as much as the average American home uses in four months. ... In a 30-story high-rise, it might be 11-and-a-half times as much.

Explanation: