Alyssa throws a snowball horizontally from the top of a roof; Ryan throws a snowball straight down from the same point. Once in flight, the acceleration of Alyssa’s snowball is _____ the acceleration of Ryan’s snowball.
A. greater than
B. less than
C. equal to
C. equal to
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In the 1960s, Maarten Schmidt determined that quasars were very distant objects by
A) determining how luminous they were. B) determining how small the source of light was from its variations in luminosity. C) discovering that they were embedded in distant galaxies. D) determining their redshifts. E) determining their parallax angles.
In a certain chemical reaction, chemical bonds are broken. The reaction is
a. endothermic and liberates energy. b. endothermic and absorbs energy. c. exothermic and liberates energy. d. exothermic and absorbs energy. e. described by none of the above choices.
A single slit forms a diffraction pattern, with the first minimum at an angle of 40° from central maximum. Monochromatic light of 530 nm wavelength is used. The width of the slit, in nm, is closest to:
A) 825 B) 791 C) 757 D) 723 E) 689
The region controlled by Earth's magnetic field is the _______________
Fill in the blank(s) with correct word