A device has power -2 D . The device is a. A convex lens of focal length 50 cm
b. A concave lens of focal length 50 cm
c. A convex lens of focal length 2 m
d. A concave lens of focal length 2 m

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

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 ?

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt