11- The focal length of a C
lens is 10cm.
a) Draw a diagram (scale 1/
ngth of a converging
a diagram (scale 1/2) showing the
al center O and the foci F and F of
Two
rays
falling on
b) Given:
the lens.
the
converging lens come out of a very far
point A on the optical axis so that these
rays are parallel to each other and
parallel to the optical axis. Construct the
path of these rays through the lens and
deduce the position of the image A of A'
given by the lens.

Aparticle moves according to a law of motion s = f(t), 0 ≤ t ≤ 12, where t is measured in seconds and s in feet. f(t) = cos(πt/6) (a) find the velocity at time t (in ft/s).

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.