The ____________________ period (or "month") of the Moon is the time required for one revolution of the Moon around Earth with respect to the stars
Fill in the blank(s) with correct word
sidereal
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Resistors in Combination: Three light bulbs, A, B, and C, have electrical ratings as follows:Bulb A: 96.0 W, 1.70 ABulb B: 80.0 V, 205 WBulb C: 120 V, 0.400 AThese three bulbs are connected in a circuit across a 150-V voltage power source, as shown in the figure. Assume that the filament resistances of the light bulbs are constant and independent of operating conditions. What is the equivalent resistance of this combination of bulbs between the terminals of the power source?
A. 61.5 ? B. 15.3 ? C. 74.0 ? D. 86.2 ? E. 364 ?
Calculate the rate of heat transfer between a 15-cm-OD pipe at 120°C and a 10-cm-OD pipe at 40°C. The two pipes are 330-m-long and are buried in sand [k = 0.33 W/(m K)] 12 m below the surface (Ts = 25°C). The pipes are parallel and are separated by 23 cm (center to center) distance.
GIVEN
Two parallel pipes buried in sand
Pipe 1
Outside diameter (D1) = 15 cm = 0.15 m
Temperature (T1) = 120°C
Pipe 2
Outside diameter (D2) = 10 cm = 0.1 m
Temperature (T2) = 40°C
Length of pipes (L) = 330 m
Thermal conductivity of the sand (k) = 0.33 W/(m K)
Depth below surface (d) = 1.2 m
Surface temperature (Ts) = 25°C
Center to center distance between pipes (s) = 23 cm = 0.23 m
FIND
The rate of heat transfer between the pipes (q)
ASSUMPTIONS
The thermal conductivity of the sand is uniform
Two dimensional, steady state heat transfer
A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation
A. can happen because the extra distance traveled makes up for the smaller force applied. B. cannot happen because a crate that heavy would lift the worker, rather than the worker lifting the crate. C. can happen because there is friction in the pulleys so the work done by the worker will not equal the work done on the crate. D. cannot happen because the work done by the worker is less than the work done on the crate.
When heat is added to a closed system, it goes into
a. work only. b. entropy only. c. internal energy only. d. either (A) or (C) or both.