Four beats per second are heard when an unknown tuning fork and a 240 hz tuning fork are struck simultaneously. this same unknown tuning fork and a 250 hz tuning fork are struck. six beats are heard. its exact frequency?

The absolute difference between two frequencies is referred to as beat frequency. That is,
fb = |f2-f1|

In this case, the frequency of unknown fork must be between 240 Hz and 250 Hz. Then,

4 = x - 240 => x = 240+4 = 244 Hz
This is true since;
6 = 250 - 244 (given in the second case).

Therefore, the unknown frequency is 244 Hz.

Cin carbonh in hydrogeno in oxygen

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.