A 5.0-kg mass is attached to the ceiling of an elevator by a rope whose mass is negligible. What force does the mass exert on the rope when the elevator has an acceleration of 4.0 m/s2 upward?
a. 69 N downward
b. 29 N downward
c. 49 N downward
d. 20 N downward
e. 19 N downward
a
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What is the wavelength of the longest wavelength light that can be seen with the human eye?
a. 400 nm b. 4000 nm c. 7000 nm d. 700 nm e. 3×10^8 m
Newton's modification of Kepler's Laws allows us to find the ________ of the planets, if we can observe satellites in orbit about them
Fill in the blank(s) with correct word
What would happen to the planets in a solar system where the central star did not have a strong wind?
A) Nothing, the star does not affect the process of planet formation. B) One planet would grow to dominate all the others and gravitationally eject them out of the system. C) All planets would continue to grow to large sizes but their orbits would be unchanged. D) The gas in the solar nebula would create a drag on the planets and their orbits would migrate inwards. E) The gas in the solar nebula would create a drag on the planets and their orbits would migrate outwards.
A pair of 1-ohm resistors connected in series has a combined resistance of
A) 1 ohm. B) 2 ohms. C) 1/2 ohm. D) none of the above