An object is placed at a distance 30cm from a thin lenses of power 4 diaptor. Discuss the nature of image

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

To a of 4 x hz is 1. 0. mm nm nm

What is the difference between mass density and weight density?