According to the graph, how frequently do objects the size of Comet Tempel 1 strike Earth?
A) once in Earth's history
B) about once every hundred million years
C) about once every million years
D) about once every thousand years
B) about once every hundred million years
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How long does it take the Earth to complete one orbit around the Sun?
A) one month B) one year C) one day D) one week E) The time it takes Earth to orbit the Sun changes significantly from one orbit to the next.
Power: The phase angle of an ac circuit is 63°. What is the power factor?
A. 0.89 B. 0.55 C. 0.45 D. 0.11
Modern electroplaters can cover a surface area of 75.0 m2 with one troy ounce of gold (volume = 1.611 cm3). What is the thickness of the electroplated gold?
a. 2.15E–8 m b. 1.07E–8 m c. 1.43E–8 m d. 4.30E–8 m e. None of the above
By what factor would the total power from a black body be modified if the surface area were to decrease by a factor of two while the temperature was doubled? /span>
1.1/16 2.1/8 3.1/4 4.1 5.4 6.8 7.None of the above 8.Cannot be determined