Earth's albedo is ______________
Fill in the blank(s) with correct word
0.33, or 33%
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Doubling only the amplitude of a vibrating mass-on-a-spring system produces what effect on the system frequency?
A) increases the frequency by a factor of 5 B) increases the frequency by a factor of 4 C) increases the frequency by a factor of 3 D) increases the frequency by a factor of 2 E) produces no change
An ideal, reversible refrigerator keeps food in the freezer portion 
and dumps excess heat into the kitchen, whose temperature is 
What is the refrigerator’s coefficient of performance under these conditions?
A. 7.4 B. 4.0 C. 8.4 D. 2.1
The element symbol C stands for cobalt
a. True b. False Indicate whether the statement is true or false
A capacitor with a capacitive reactance of 40.0 ? is connected in series with a 100-? resistor across an ac source of frequency 60.0 Hz. What is the phase angle?
A) +68.2° B) -68.2° C) -21.8° D) +21.8° E) 90.0°