TWO QUESTIONS 1. In a gear box, if the driving gear has 120 teeth and revolves at
60 rev/min. What is the speed of the driven gear with 80 teeth.

2. How many teeth does gear B have, if gear A has 60teeth and.
rotates 20 times while gear B turns 40 times.

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

The ozone hole appears in antarctica during

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.