A fossil is found in a layer of strata above one layer dated at 2 million years. From this we can deduce the age of the fossil to be
A) we can tell nothing about the fossil's age from this data
B) younger than 2 million years
C) between 2 and 3 million years old
D) older than 3 million years
B
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Why was the globular cluster M13 selected as the target for the 1974 Arecibo message?
A) globular clusters are the most likely place to find stars with planetary systems B) stars in globular clusters are rich in heavy elements, the building blocks of life C) signals from advanced civilizations have previously been detected coming from this cluster D) globular clusters are densely packed with stars, hence maximizing the probability of interception by an advanced civilization
Discrete wavelengths of light are emitted by an excited gas because
a. the speed of light is constant in a given medium. b. light can behave either as a wave or as a particle. c. electron energy levels are quantized. d. the intensity of radiation is proportional to the second power of the frequency.
An automobile moving along a straight track changes its velocity from 40 m/s to 80 m/s in a distance of 200 m. What is the (constant) acceleration of the vehicle during this time?
A. 8.0 m/s B. 9.6 m/s C. 12 m/s D. 6.9 m/s E. 0.20 m/s
A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. A mass of 423 g is attached to the free end of the string
With the string vertical and taut, the mass is gently released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate, but does not slip on the pulley. What is the speed of the mass after it has fallen through 1.25 m? A) 2.00 m/s B) 2.28 m/s C) 1.97 m/s D) 3.94 m/s E) 4.95 m/s