What is the normal force exerted by the ground on a 65-kg metal bar?
-640 N
640 N
-65 N

640N

Explanation:

Mass of a metal bar, m = 65 kg

We need to find the normal force exerted by the ground on the bar.

The normal force on an object acts in upward direction. The magnitude of normal force is equal to its weight.

N= mg

Put m = 65 kg and g = 9.8 m/s²

N = 65 × 9.8

= 637 N

or

N = 640 N

Hence, the normal force is 640 N.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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