Consider the machine below. All surfaces are frictionless. What force f must be applied to m_! to keep m_3 from rising or falling.

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach