Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?
A) zero
B) half the sum of their original momentums
C) twice the sum of their original momentums
D) need more information
Answer: A
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Red light has a lower energy per photon than blue light. Therefore, red light has
A) higher frequency, shorter wavelength than blue light. B) lower frequency, longer wavelength than blue light. C) lower frequency, shorter wavelength than blue light. D) higher frequency, longer wavelength than blue light.
The heat conduction equation in cylindrical coordinates is
(a) Simplify this equation by eliminating terms equal to zero for the case of steady-state heat flow
without sources or sinks around a right-angle corner such as the one in the accompanying
sketch. It may be assumed that the corner extends to infinity in the direction perpendicular to
the page. (b) Solve the resulting equation for the temperature distribution by substituting the
boundary condition. (c) Determine the rate of heat flow from T1 to T2. Assume k = 1 W/(m K)
and unit depth .
GIVEN
• Steady state conditions
• Right-angle corner as shown below
• No sources or sinks
• Thermal conductivity (k) = 1 W/(m K)
FIND
(a) Simplified heat conduction equation (b) Solution for the temperature distribution (c) Rate of heat flow from T1 to T2 ASSUMPTIONS
• Corner extends to infinity perpendicular to the paper
• No heat transfer in the z direction
• Heat transfer through the insulation is negligible
SKETCH
Planktonic and benthic foraminifera can absorb many billions of tonnes of carbon from the atmosphere
What will be an ideal response?
A uniform 2.00-kg circular disk of radius 20.0 cm is rotating clockwise about an axis through its center with an angular speed 30.0 revolutions per second
A second uniform 1.50-kg circular disk of radius 15.0 cm that is not rotating is dropped onto the first disk so that the axis of rotation of the first disk passes through the center of the second disk. What is the final angular speed of the two disks when they are rotating together? A) 16.9 revolutions per second B) 19.2 revolutions per second C) 21.1 revolutions per second D) 17.1 revolutions per second E) 12.7 revolutions per second