When atoms of two elements with a great difference in electronegativity bond together, the bonding is probably
a. ionic.
b. polar covalent.
c. covalent.
d. metallic.
a
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A 16-kg mass is placed on a 25° incline and friction keeps it from sliding. The coefficient of static friction in this case is 0.574 and the coefficient of sliding friction is 0.519 . The mass is given a shove causing it to slide down the incline. Taking down the incline as positive, what is the acceleration of the mass while it is sliding?
a. 0.47 m/s2 b. –0.47 m/s2 c. –0.96 m/s2 d. 0.96 m/s2 e. 14.50 m/s2
Velma, the space woman, orbiting at 100 miles above earth's surface, feels weightless because
A) she is in a vacuum. B) she is away from the pull of earth's gravity. C) she went on a diet. D) she is falling freely around Earth. E) Actually, she doesn't feel weightless.
The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc
Indicate whether the statement is true or false
Photons of blue light
a. have a greater energy than photons of red light. b. have a greater energy than photons of ultraviolet light. c. have a lower frequency than photons of red light. d. have a longer wavelength than photons of red light. e. travel at a greater speed than photons of red light.