Four unequal resistors are connected in a parallel circuit. Which one of the following statements is correct about this circuit?
A)
The total resistance is less than the smallest resistor.
B)
The total resistance is equal to average of the four resistors.
C)
The total resistance is more than the largest resistor.
D)
The total resistance is equal to zero.
E)
None of the other answers is correct.
A
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Double-Slit Interference: Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. All radio measurements are made far from the antennas. What is the smallest angle, reckoned north of east from midway between the antennas, at which destructive interference of the two radio waves occurs? (c = 3.00 × 108 m/s)
A. 13° B. 6.4° C. 9.7° D. 16° E. 19°
A monatomic ideal gas is compressed adiabatically to one-third of its initial volume. The resulting pressure will be
A) three times as large as the initial value. B) less than three times as large as the initial value. C) more than three times as large as the initial value. D) equal to the initial value. E) impossible to predict on the basis of this data.
A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block?
a.
2.0 N
b.
1.4 N
c.
1.6 N
d.
2.8 N
e.
3.4 N
Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force of
A) zero. B) 250 N. C) 500 N. D) 1000 N. E) none of the above