Doubling the number of effective opaque layers in a planet’s atmosphere from n to 2n will make its average surface temperature increase by what factor?
A. 2
B. 21/4
C. 31/4
D. (2 + 1/n)1/4
E. [2 + 1/(n+1)]1/4
F. Some other factor (specify)
T. The factor depends on the planet’s initial temperature.
F. Some other factor (specify)
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Neutron stars have:
A) very strong bi-polar magnetic fields. B) weak or non-existent magnetic fields. C) periods of days or weeks. D) monopolar fields that switch polarity every rotation. E) no relation to pulsars.
______________materials are made of at least two separate materials that maintain their identity in the combined material.
Fill in the blank(s) with the appropriate word(s).
A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the initial force that must be applied to the smaller piston in order to start lifting the car? For purposes of this problem, neglect the weight of the pistons. A) 727 N B) 926 N C) 2900 N D) 3330 N E) 1.20 kN
Ball bearings of 20% nickel steel, 10 cm spherical diameter, at 200ºC are quenched in 20ºC oil where the convective heat transfer coefficient is 200 W/m^2K. Determine a) the time for the surface to reach 80ºC, and b) the thermal energy exchanged during this time.
What will be an ideal response?