The period of the second hand on a clock is
A) 1 second.
B) 1/60 second.
C) 60 seconds.
D) 3600 seconds.
E) 12 hours.
Answer: C
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A certain crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. What is the intensity level due to a set of five such crying babies, all crying with the same intensity?
You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB
Negative work can be done
a. by friction on the tires while a car is accelerating without skidding. b. by a spring at the bottom of an elevator shaft when it stops a falling elevator. c. by a hand catching a ball. d. by all of the above. e. only by (b) and (c) above.
A 1000 
resistor is in a circuit with 30.0 mA flowing through it. A voltmeter with internal resistance 1000 
is used to measure the voltage across the resistor. What is the reading from the voltmeter if 30.0 mA still flows in the circuit?
A. 30.0 V B. 29.9 V C. 27.0 V D. 15.0 V E. 3.00 V
When Portland cement and aggregate are mixed with water, _________reactions bond the Portland cement to the aggregate, thereby forming solid concrete.
Fill in the blank(s) with the appropriate word(s).