The magnitude of the charge on each plate of a parallel plate capacitor is 4 ?C and the potential difference between the plates is 80 V. What is the capacitance of this capacitor?
A)
0.1 × 10-6 F
B)
300 × 10-6 F
C)
100 × 10-6 F
D)
20 × 10-6 F
E)
5 × 10-8 F
E
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A 15 cm-OD pipe is buried with its centerline 1.25 m below the surface of the ground [k of soil is 0.35 W/(m K)]. An oil having a density of 800 kg/m3 and a specific heat of 2.1 kJ/(kg K) flows in the pipe at 5.6 L/s. Assuming a ground surface temperature of 5°C and a pipe wall temperature of 95°C, estimate the length of pipe in which the oil temperature decreases by 5.5°C.
GIVEN
FIND
The length of pipe (L) in which the oil temperature decreases by 5.5°C
ASSUMPTIONS
Steady state condition
Two dimensional heat transfer
SKETCH
In Gulliver's Travels, Jonathan Swift wrote about a country where astronomers had found that Mars had two moons. (The moons of Mars were unknown at that time)
"They have likewise discovered two lesser stars, or satellites, which revolve about Mars, whereof the innermost is distant from the center of the primary planet exactly three of his diameters, and the outermost five; the former revolves in the space of ten hours, and the latter in twenty-one and a half..." If this information were correct, what would the mass of Mars be? The radius of Mars is 3,393,500 m and G = 6.67 x 10-11 N•m2/kg2. A) 3.86 × 1024 kg B) 6.45 × 1023 kg C) 5.67 × 1021 kg D) 2.83 × 1021 kg E) 4.78 × 1020 kg
Astronomers think of pulsars not as pulsing objects but rather as objects emitting beams
Indicate whether the statement is true or false
Albert uses as his unit of length (for walking to visit his neighbors or plowing his fields) the albert (A), the distance Albert can throw a small rock. One albert is How many square alberts is equal to one acre? (1 acre = 43,560 ft2 = 4050 m2)
What will be an ideal response?