If the answer to your calculation has units of kg ? m2/s, what type of quantity could it be? (There could be more than one correct choice)
A) angular momentum B) power
C) work D) force
E) linear momentum F) torque
G) rotational kinetic energy H) moment of inertia
A
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The critical density of the universe is the
A) average density the universe would need for gravity to someday halt the current expansion if dark energy did not exist. B) actual average density of the universe. C) density of dark matter in the universe. D) density of water.
Why is the energy source for active nuclei like Seyferts thought to be compact?
A) The light can vary over short time intervals. B) Their energy appears to be non-stellar synchrotron radiation. C) We know the masses of the black holes that lurk there, and can find their radii. D) They are all strong radio sources, with assigned frequencies by their sizes. E) The sources appear to be single stars in photos.
The quark structure of the neutron is __________
Fill in the blank(s) with correct word
A photovoltaic cell receives energy input by
A) conduction. B) convection. C) radiation. D) all of the above