Which of the following scenarios describes a condition in which resonance can occur?

a. two tuning forks that vibrate at the same frequency are near each other. one tuning fork is struck with a mallet so that it vibrates.
b. two tuning forks are struck simultaneously, one with a frequency of 659hz and one with a frequency of 639 hz, causing beats.
c. a tuning fork is over a column of air that is 9/2 the wavelength of the wave produced by the tuning fork.
d. an isolated tuning fork is struck with a mallet, causing it to vibrate strongly at 659 hz.

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine