An Iron weight, suspended by a string, is motionless. The tension in the string is 4,75 newtons What is the mass of the iron weight? A 0.485 kilograms
4.75 kilograms
C 9.65 kilograms
OD 10.0 kilograms
15,5 kilograms

A

0.485 Kg

Explanation:

Since the iron weight is motionless, the magnitude of tension T in the string will be equal but opposite to the magnitude of the weight W.

T = W

Where W = mg

T = mg

Where T = 4.75 N, g = 9.81m/s^2

4.75 = 9.81m

m = 4.75/9.81

m = 0.485 Kg

Therefore, the mass of the iron weight is approximately 0.485 kg

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j