If the Moon's orbital plane was aligned with the celestial equator we could
a. have eclipses every month.
b. never have eclipses.
c. have eclipses only at solstice.
d. have eclipses only at the equinoxes.
d
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The observed distribution of matter in the Universe is best understood as being caused by ____
a. clumping of dark matter in the early Universe causing clumping of normal matter b. clumping of normal matter in the early Universe causing clumping of dark matter c. simultaneous clumping of normal and dark matter d. large variations in the intensity of the cosmic microwave background e. homogenous expansion of normal and dark matter
If a body's acceleration is doubled then the amount of force acting on the body had to _______
a. double b. halve c. stay the same d. None of the other choices are correct.
In Newton's law of universal gravitation, F = Gm1m2/r2 for uniform objects, the quantity r is______________
Fill in the blank(s) with correct word
In electron diffraction, an electron moving at speed v << c acts like
a. a particle with momentum mv. b. a particle with position coordinate v/t. c. a wave with wavelength v/t. d. a wave with wavelength h/mv. e. both a particle with position coordinate v/t and a wave with wavelength v/t.