Compared to its size, the Sun is very far away from all other stars
Indicate whether the statement is true or false
TRUE
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One of the lines of Hydrogen has a wavelength of 121.6 nm. If a cloud of Hydrogen gasis moving TOWARDS us at 200km/s, what will we detect?
a) An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm. b) An emission line in the cloud's spectrum with a wavelength longer than121.6 nm. c) An emission line in the cloud's spectrum with a wavelength of exactly 121.6 nm. d) This cloud will not emit a spectrum at all. e) A continuous spectrum with an absorption line at exactly 121.6 nm.
The _______________ is the amount of energy needed to pull an electron completely away from the nucleus
Fill in the blank(s) with correct word
A 6.00 kg box slides up a 8.00 m long friction incline at an angle of 30.0 degrees by a force 50.0 N parallel to the incline. The coefficient of kinetic friction is 0.100. The work done against friction is
A. 22.0 J. B. 26.5 J. C. 30.3 J. D. 35.2 J. E. 40.7 J.
A wheel (radius = 0.25 m) is mounted on a frictionless, horizontal axis. The rotational inertia of the wheel about the axis is 0.040 kg?m2. A light cord wrapped around the wheel supports a 0.50-kg object as shown in the figure. The object is released from rest. What is the magnitude of the acceleration of the 0.50-kg object?
?
?
a.
3.0 m/s2
b.
3.4 m/s2
c.
4.3 m/s2
d.
3.8 m/s2
e.
2.7 m/s2