7. A 10-kg block on a horizontal frictionless surface is attached to a light spring (force constant = 0.80 kN/m). The block is initially at rest at its equilibrium position when a force (magnitude P =
80 N) acting parallel to the surface is applied to the block, as shown. What is the speed of the
block when it is 13 cm from its equilibrium position?
P
00000000
a.
b.
0.85 m/s
0.89 m/s
0.77 m/s
0.64 m/s
0.52 m/s
d.
e.

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?