If a student tried to lift a 350 n box upwards with a lever that is 75 cm long, how much force would they need to provide given a fulcrum 20 cm away from the box. 1312.5 n. 93.3 n. 65.6n. 2333n.

We will take moment about the fulcrum point

Taking, box 350 N at a distance of  20 cm

we can write the moment equation as below:

350 N x 20 cm - X x 75 cm = 0

X = 350 N x 20 cm /75 cm

= 93.33 N

93.3 N

Explanation:

Applying the equation of moment

M = r * F

r = distance from the applied force to the object = 75 cm

F = force applied = X

Moment of force = load * distance from load = 350 * 20

back to equation

350 * 20 = X * 75

7000 = 75 X

X ( force applied/needed) = 7000 / 75 = 93.3 N

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