A 1-kg mass at the Earth's surface weighs
A)1 N.
B)5 N.
C)10 N.
D)12 N.
E)none of the above

Question

Quizplus · Accepted Answer

The weight of an object is the force exerted on it due to gravity, which can be calculated using the formula W = mg, where W is the weight, m is the mass of the object, and g is the acceleration due to gravity. At the Earth's surface, the value of g is approximately 9.8 m/s^2. Therefore, the weight of a 1-kg mass at the Earth's surface is W = (1 kg)(9.8 m/s^2) = 9.8 N. Rounded off to one significant figure, the weight is approximately 10 N, which is the best answer choice.

A 1-Kg Mass at the Earth's Surface Weighs