Question

15 POINTS !!!

Answer 1

#1

As per work energy theorem work done by all forces must be equal to change in its kinetic energy

so correct answer will be

$W_{net}$ = change in kinetic energy

#2

Torque is defined as

$\tau = r \times F$

$\tau = rFsin\theta$

so here torque will be maximum when applied force is perpendicular to the rod

so first figure of rod is correct for maximum torque

#3

When car makes turn then its passengers moves outwards which is due to the property of inertia because due to this property passengers has tendency to move in same direction and hence it feels to move outwards

So correct answer will be

inertia

#4

As per energy conservation we can say

initial potential energy = final kinetic energy

$PE = KE$

$KE = mgH$

$KE = 0.5(9.8)(0.5)$

$KE = 2.5 J$