1. A 75 kg man is in a car travelling at 22m/s. a) Find its kinetic energy.
The car strikes a concrete wall and comes to rest after the front of the car has collapsed 1.5m.
The man is wearing a seat belt and harness. What is the average force exerted by the belt and
harness during the crash

multiply 2kg by latent heat of vap

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it