Three identical resistors are connected in parallel to a 12-V battery. What is the voltage of any one of the resistors?
A)
36 V
B)
24 V
C)
12 V
D)
4 V
E)
zero
C
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Molten iron is in a large foundry ladle at 1600ºC. Air at 150ºC is directly above the surface of the molten iron and the convective heat transfer coefficient is 300 W/m^2 ?K. Iron at atmospheric pressure has a saturation temperature of 1538ºC and a heat of fusion of 247.3 kJ/kg. If the convective heat transfer coefficient between the molten iron and the freezing iron is taken as 500 W/m^2, determine the time to form a 5-mmthick surface of solid iron in the ladle.
What will be an ideal response?
Which recording formats employ magnetism?
a. videotape b. CD c. DVD d. floppy disk
A bucket of water with total mass 23 kg is attached to a rope, which in turn is wound around a 0.050-m radius cylinder, with crank, at the top of a well. The moment of inertia of the cylinder and crank is 0.21 kgm2 . The bucket is raised to the top of the well and released to fall back into the well. What is the kinetic energy of the cylinder and crank at the instant the bucket is moving with a
speed of 6.0 m/s? a. 2.1 × 10^3 J c. 0.86 × 10^3 J b. 1.5 × 10^3 J d. 0.40 × 10^3 J
One hundred milliliters of water is poured into a U-tube that has a cross-sectional area of 1 cm2 . Then 100 milliliters of oil, with a density 80% that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube