The figure above shows two yo-yos that have the same mass and rotational inertia. The one on the right has a thicker axle than the one on the left. The torque produced by gravity is
A. zero; there is no net torque on the yo-yos.
B. larger for the yo-yo on the right.
C. larger for the yo-yo on the left.
D. the same for both yo-yos.
Answer: B
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A vertical side of a cooling tower is approximately 90ºC when the surrounding air is 25ºC. If the tower is 30 m high, estimate the maximum vertical velocity of the air due to natural convection.
What will be an ideal response?
Evaluate the Prandtl number from the data below
GIVEN
FIND
The Prandtl number (Pr)
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A) 7.2° B) 14° C) 21.4° D) 28°
A 1.5 V flashlight battery, a 10 ohm resistor, and a flashlight lamp are available. How should the lamp be connected in a circuit so that it would glow the brightest?
A. Connect it in series with the resistor and battery so that the bulb is next to the positive terminal of the battery B. Connect it in parallel with the battery and the resistor C. Connect it directly to the battery; don't use the resistor D. Connect it in series with the resistor and battery so that the bulb is next to the negative terminal of the battery