Series/Parallel Circuits: As more resistors are added in parallel across a constant voltage source, the power supplied by the source
A. increases.
B. decreases.
C. does not change.
D. increases for a time and then starts to decrease.
Answer: A
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The heat of fusion of ice is 80. kcal/kg-C°. When 50. g of ice at 0°C is added to 50. g of water at 25°C, what is the final temperature?
What will be an ideal response?
The Earth remains in orbit about the Sun, rather than falling in to the Sun, because
1.it is outside of the gravitational influence of the Sun. 2.the net force on the Earth is zero. 3.although the Earth is constantly being pulled toward the Sun, it is always moving with a velocity component perpendicular to the direction that it is being pulled. 4.none of these apply.
The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years
Indicate whether the statement is true or false
The variation in the pressure of helium gas, measured from its equilibrium value, is given by ?P = 2.9 × 10^?5 cos (6.20x ? 3 000t) where x and t have units m and s, and ?P is measured in N/m2 . Determine the wavelength (in m) of the wave
a. 1 500 b. 0.32 c. 477 d. 1.01 e. 0.50