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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc

Indicate whether the statement is true or false

Physics & Space Science

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.

Physics & Space Science