While yet unseen, some gravitational evidence suggests the existence of dark galaxies
Indicate whether the statement is true or false
TRUE
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Isotopic analysis of meteorites suggests the Earth and the rest of the solar system formed
A) 3.85 billion years ago B) 4.57 billion years ago C) 4.38 billion years ago D) 4.02 billion years ago
A grating has 450 lines per millimeter. What is the highest order m that contains the entire visible spectrum from 400 nm to 700 nm?
A) m = 2 B) m = 3 C) m = 4 D) m = 5 E) m = 6
What phenomenon is created by two tuning forks, side by side, emitting frequencies, which differ by only a small amount?
a. resonance b. interference c. the Doppler effect d. beats
A block of mass m is resting on a ramp making an angle ? with respect to the horizontal. The coefficient of static friction and the coefficient of kinetic friction for this surface are ms and mk, respectively. If the block does not slide, then the frictional force holding the block must be