Wire A has a diameter half that of B but is otherwise identical. The electric field acting in each has the same magnitude. How do the currents flowing through these two wires compare?
F. Other (specify)
T. It is impossible to say given the provided information
E. /A = (1/4)/B
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Cellular pH is kept near a value of seven, due to the action of:
a. salts b. buffers c. acids d. bases e. water
Energy Conservation With Nonconservative Forces: A 7.5-kg otter slides down a hill, starting from rest at the top. The sloping surface of the hill is 8.8 m long, and the top is 6.5 m above the base. If the speed of the otter at the bottom of the hill is 9.2 m/s, how much energy was lost to nonconservative forces on the hill?
Fill in the blank(s) with the appropriate word(s).
Ohm's law tells us that the amount of current produced in a circuit is
1) directly proportional to voltage. 2) inversely proportional to resistance. 3) both of these which means that current in a conductor can be increased by 4) increasing the voltage across it. 5) reducing its resistance. 6) both of these D) none of the above
A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The inside wall is to be covered by a layer of wood in order to reduce the rate of thermal energy flow through the wall by 90 percent
The inner surface of the wooden wall is maintained at -10°C and the outer surface of the concrete wall is at 20°C. The thermal conductivities of concrete and wood are 0.80 W/m ? K (concrete) and 0.040 W/m ? K (wood). What is the temperature difference across the layer of wood? A) 24 C° B) 25 C° C) 26 C° D) 27 C° E) 28 C°