A body weighs 0.40 N in air,0.30 N fully immersed in water and 0.35 N when fully immersed in a liquid. Calculate the relative density of the liquid.

Describe the path of a ray that approaches a mirror parallel to the principal axis.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?