Question

MCQ



please i need asap this answers asap​

Answer 1

Answer:

a) K + U = constant

b) v² = u² + 2as

c) U = mgh

d) M.A = Load/Effort

e) Pulley whose axis of rotation is movable is called single movable pulley.

f) Load = 400N, Effort = 480N, M.A = Load/Effort = 400/480 = 0.83

g) Force which acts away from the centre of gravity is called centrifugal force.

h) One HP is equals to 746 W.

i) Body has K.E = 2500J, mass is 500g, velocity will be : K.E = 1/2mv²

2500 = 1/2 × 0.5 × v² = 2500 = 0.25 × v² = v² = 2500/0.25 = 10000

v = 100 m/s

j) In a electric cell, energy change is chemical to electrical energy.