What part of wooden block(50cm*30cm*20cm)remains above the surface of water when the wooden block is placed in water? Out of 20cm height of it, what part of its height remains out of water?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

A4.0-cm tall light bulb is placed a distance of 32.0 cm from a concave mirror having a focal length of 16.0 cm. determine the image distance