The unit of electric current is the ______________
Fill in the blank(s) with correct word
ampere (A)
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If the density of the Universe is ________ than the critical density, then the Universe will ________.
A. larger; expand forever B. larger; eventually collapse in a "Big Crunch" C. less; eventually collapse in a "Big Crunch" D. less; not change in size
Resolution: In one particular case, the limiting angle of resolution for an eye is 1.4 × 10-4 rad. What is the minimum separation between two point sources of light that the eye can distinguish if they are at a distance of 40 m from the observer?
A. 2.8 mm B. 5.6 mm C. 1.4 mm D. 8.4 mm E. 4.7 mm
Hubble's Law (also known as the Hubble-Lemaitre Law) can be restated as:
A. The mass-to-light ratio of a spiral galaxy is greater if its rotational velocity is also greater. B. The more distant a galaxy, the faster it is receding. C. The rotation curve of a galaxy is related to the amount of mass inside. D. The velocity curves of spiral galaxies only make sense if there exists a lot of unseen matter.
The rigid body shown is rotated about an axis perpendicular to the paper and through the point P. If M = 0.40 kg, a = 30 cm, and b = 50 cm, how much work is required to take the body from rest to an angular speed of 5.0 rad/s? Neglect the mass of the connecting rods and treat the masses as particles.
A. 2.9 J B. 2.6 J C. 3.1 J D. 3.4 J E. 1.6 J