A one-way mirror works because __________
Fill in the blank(s) with correct word
its surfaces are half-silvered
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What happens when a main-sequence star exhausts its core hydrogen fuel supply?
A) The entire star shrinks in size. B) The core shrinks while the rest of the star expands. C) The core immediately begins to fuse its helium into carbon. D) The star becomes a neutron star.
Three point charges, two positive and one negative, each having a magnitude of 20 mC are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
a. 80 N b. 40 N c. 69 N d. 57 N e. 75 N
A waitress fills your water glass with ice water (containing many ice cubes) such that the liquid water is perfectly level with the rim of the glass. As the ice melts,
A) the liquid-water level remains flush with the rim of the glass. B) the liquid water level rises, causing water to run down the outside of the glass. C) the liquid-water level decreases.
Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The number of fringes per unit length on the screen can be halved
A.
.B.
.C.
the wavelength is changed to 
.D.
E.
.