Which of the following lenses is a converging lens?
a. double-convex lens
b. spherical-convex lens
c. plano-concave lens
d. convexo-concave lens

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.