What factor is essential to Joule's paddle wheel demonstration? A Paddles that have greater kinetic energy than the masses' gravitational potential energy
B Masses that have an initial temperature that is cooler than the water
C Water temperature sufficient to move the paddles
D Friction between the water and the paddles

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Argon, neon, and xenon are examples of

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?