Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other current. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 ?N, what is the greater of the two currents?
a. 0.20 A
b. 0.40 A
c. 40 mA
d. 20 mA
e. 0.63 A
b
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The adoption of very similar streamlined body shapes by both sharks and dolphins provides evidence for
A) cross-breeding B) convergent evolution C) genetic mutations D) life originating in the oceans
One end of a 0.3-m-long steel rod is connected to a wall at 204°C. The other end is connected to a wall that is maintained at 93°C. Air is blown across the rod so that a heat transfer coefficient of 17 W/(m2 K) is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38°C, what is the net rate of heat loss to the air?
GIVEN
FIND
The net rate of heat loss to the air (qf)
ASSUMPTIONS
The wall temperatures are constant
The system is in steady state
The rod is 1% carbon steel
The thermal conductivity of the rod is uniform and not dependent on temperature
One dimensional conduction along the rod
SKETCH
The pre-Copernican astronomers shared a geocentric paradigm that included uniform circular motion, geocentrism, and the perfection of the heavens
Indicate whether the statement is true or false
A baseball is hit almost straight up into the air with a speed of about 20 m s.
(a) How high does it go? (b) How long is it in the air?