For the multiple choice questions below, please circle the best answer. (3 points each.) 1. What is the criterion for an elastic collision? A. Internal forces must sum to zero B. Internal forces must be conservative C. The colliding bodies must stick together 2. Which equations hold for a 1D elastic collision between object 1 and object 2, where 2 is initially at rest, p is momentum, K is kinetic energy, v is velocity, and i and f note initial and final values? A. pp1 = pp1 + pp2 B. KK1 = KK1 + KK2 C. 1 = −(1 − 2) D. ℎ 3. Kinetic energy is conserved in a(n) A. Completely inelastic collision B. Partially inelastic collision C. Elastic collision 4. Which statement of work is not true? A. Work can be positive, negative or zero B. Work done by gravity can be represented by a potential energy C. Work done by sliding friction is no

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface