Question

question 29 of 29
a piano has a mass of 99 kg. what is the weight of the piano?
a. 842 n
b. 1129 n
c. 970 n
d. 1030 n

Explanation:

Step1: Recall weight - mass formula

The formula for weight $W$ is $W = mg$, where $m$ is mass and $g$ is the acceleration due to gravity. On Earth, $g\approx9.8\ m/s^{2}$.

Step2: Substitute values

Given $m = 99\ kg$ and $g=9.8\ m/s^{2}$, we calculate $W=99\times9.8$.
$W = 99\times9.8=(100 - 1)\times9.8=100\times9.8-1\times9.8=980 - 9.8 = 970.2\ N\approx970\ N$.

Answer:

C. 970 N