A hurricane, in other parts of the world, is also known as
a. a cyclone.
b. a willy-willy.
c. a typhoon.
d. all of the above.
d
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A person's eye lens is 2.8 cm away from the retina. What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?
A) -2.8 cm B) 2.8 cm C) -2.4 cm D) 2.4 cm E) 2.2 cm
A very light 1.00-m wire consists of two segments of equal length, one of steel (Young's modulus is 2.00 × 1011 N/m2 )
and one of brass (Young's modulus is 9.0 × 1010 N/m2 ). The steel segment is 1.50 mm in diameter, and the brass segment has twice this diameter. When a weight w is hung from the ceiling by this wire, the steel segment stretches by 1.10 mm. Find the weight w. A) 190 N B) 390 N C) 780 N D) 1000 N E) 3100 N
An ideal transformer has 50 turns in its primary and 250 turns in its secondary. When 12-V ac is connected to the primary, the voltage available to the secondary is
A) 5 V. B) 10 V. C) 30 V. D) 60 V.
A series LRC ac circuit has a resistance of 4.0 k?, a capacitance of 33.0 ?F, and an inductance of 23.0 H. If the frequency of the alternating current is 2.0/? kHz, what is the phase angle between the voltage and the current?
A) -1.6 rad B) 23 rad C) 3.1 rad D) 1.5 rad