(Extra Credit  worth 5 points):  All of the above objects have the same mass M, and the same radial distance R from the axis of rotation as shown.  Which two objects have the same moment of inertia about the central axis? (Select a correct answer and show work to prove why!)

This reverse half circle lens is made out of glass (nglass = 1.5) and is surrounded by air (nair = 1.0).  The surface on the left is flat.  The radius of curvature on the right is R = 3 cm.  For incoming rays from the left, what is the focal length of this lens?

Which condition is closely linked to heart disease?

The wave function for a traveling wave on a taut string (in SI units) is y = (0.35m)cos[2π(x – 10t)].  If the mass density of the string on which the wave propagates is 0.005 kg/m, what is the transmitted power? (Select closest answer)

 A 10,000-N shark is supported by a horizontal cable attached to a 6.0-m rod that can pivot at the base. The rod weighs 4000 N. Calculate the tension in the cable. (select closest answer)

Three blocks are in contact with each other on a frictionless horizontal surface. A horizontal force F = 30 N is applied to m1. Find the magnitude of the contact force between m2 and m3.  (Show all work including the free body diagram!)

Determine the current in the 15-V emf shown.

A dentist uses a concave mirror (focal length 3 cm) to examine some teeth.  If the distance from the object to the mirror is 1 cm, what is the magnification of the tooth?

Light strikes a ruby (n = 1.76) immersed in glycerin (n = 1.473) at an angle of 50o.  What is the angle of refraction?

A truck moving at 30 m/s approaches a police car moving at 20 m/s in the opposite direction.  if the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck?  (The speed of sound in air is 343 m/s.)