Gymnast nellie weighs 300 n. she hangs from two
non-vertical ropes, as shown in figures 2.11 and
2.12 in chapter 2. (a) how large is the resultant
of the rope tensions in figure 2.11? (b) how large
is the resultant of the rope tension in figure 2.12?
(c) in which of these two figures is the horizontal
component of the rope tension greater? explain
how you can tell.

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

Name two kinds of practical electric pumps.