The numerical dates associated with events on the geologic time scale were determined by
A) relative dating.
B) superposition.
C) radiometric dating.
D) fossil assemblages through time.
Answer: C
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All the elements heavier than helium on the periodic table, including the ones in your body, were created in the cores of massive stars
a. True b. False Indicate whether the statement is true or false
Total Internal Reflection: A light ray enters a glass enclosed fish tank. From air it enters the glass at 20° with respect to the plane of the surface and then emerges into the water. The index for the glass is 1.50 and for water 1.33.(a) What is the angle of refraction in the glass?(b) What is the angle of refraction in the water?(c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection? If so, find it.
What will be an ideal response?
Consider an Earth satellite in an elliptical orbit. Its centripetal acceleration is
A) zero. B) > g at the satellite. C) < g at the satellite. D) constant. E) g at the satellite.
The windings of a motor have a resistance of 4.0 ?. The counter emf of this motor when connected to a 120-V line and running at full speed is 104 V
(a) What is the start up current of this motor? (b) What is the current in the motor when running at full speed?