Graphical Analysis: An object is moving with constant non-zero acceleration in the +x direction. The position versus time graph of this object is
A. a horizontal straight line.
B. a vertical straight line.
C. a straight line making an angle with the time axis.
D. a parabolic curve.
Answer: D
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The strength of gravity within a molecular cloud depends on
A) density only. B) temperature only. C) density and temperature. D) composition. E) thermal pressure.
Given that the universe is about 14 billion years old, which of the following statements is logically valid?
A) All galaxies nearby us are about 14 billion years old. B) All galaxies that we can see are about 14 billion years old. C) All galaxies that we see have an age that is approximately equal to the age of the universe today, minus the lookback time (or light travel time) corresponding to the redshift of that galaxy. D) The oldest galaxies we see at great distances are younger than the oldest galaxies we see nearby.
What is the limiting angle of resolution for the eye if the pupil diameter of the eye is 4.0 mm, a wavelength of light of 600 nm and index of refraction for the eye equal to 1.34?
A) 4.2 × 10-4 rad B) 2.1 × 10-4 rad C) 1.4 × 10-4 rad D) 1.1 × 10-4 rad E) 2.6 × 10-4 rad
What would happen to the core of the sun if its temperature rose slightly?
A) The rate at which fusion occurs would increase, leading to a contraction of the core, which would in turn cause the temperature to rise even further. B) The rate at which fusion occurs would decrease, leading to a contraction of the core, which would in turn cause a further temperature rise. C) The rate at which fusion occurs would decrease, leading to an expansion of the core, which would in turn cause the temperature to drop back down. D) The rate at which fusion occurs would increase, leading to an expansion of the core, which would in turn cause the temperature to drop back down.