A 13,000-N vehicle is to be lifted by a 25-cm diameter hydraulic piston. What force needs to be applied to a 5.0 cm diameter piston to accomplish this? Assume the pistons each have negligible weight
A) 260 N
B) 520 N
C) 2600 N
D) 5200 N
B
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According to cosmic inflation theory, the distribution of galaxies we see today is a consequence of
A) the evolution of dark matter. B) quantum fluctuations in the exceedingly small early universe. C) random expansion. D) some force yet to be identified.
Scientists have recently discovered that
A) some, or possibly all, types of neutrinos have rest mass. B) it is possible for neutrinos to spontaneously transmute from one of the three neutrino types to another. C) Both of the above. D) None of the above.
If an object isn’t accelerating, no external force is acting on it
1.True 2.False
Redshift surveys give us:
A) an idea of how turbulent the intergalactic gas is. B) a 3-D layout of galaxies in space. C) the total mass of the universe. D) a more accurate census of the Local Group. E) a better value of the speed of light.