A circuit consists of N resistors, all of resistance R, connected as shown below. A potential difference V is applied to the circuit. The equivalent resistance of the circuit is
a.
.
b.
b
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A rotary solid sorption dehumidifier is used to dehumidify air at 95ºF, 60% relative humidity. If the dehumidifier performance map is like that shown in Figure 8-24, estimate the outlet dry air temperature and its relative humidity. Then estimate the rate of water removed from 100 cfm of air.
Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the small block on the large block?
A. 0.48 N to the right B. 0.72 N to the right C. 0.72 N to the left D. 0.48 N to the left E. 0.65 N to the left
A long straight wire carries a current of 40 A in a region where a uniform external magnetic field has a 30-?T magnitude and is parallel to the current. What is the magnitude of the resultant magnetic field at a point that is 20 cm from the wire?
a. 70 ?T b. 40 ?T c. 10 ?T d. 50 ?T e. 36 ?T
What evidence supports the idea that a collision between two spiral galaxies might lead to the creation of a single elliptical galaxy?
A) observations of some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies B) the fact that elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies C) observations of some elliptical galaxies with stars and gas clouds in their cores that orbit differently from the other stars in the galaxy D) observations of giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies E) all of the above