A particular jet engine produces a tone of 490 Hz. Suppose that one jet is at rest on the tarmac while a second identical jet flies overhead at 83.5% of the speed of sound. The pilot of each jet listens to the sound produced by the engine of the other jet.

(a) Calculate the frequency heard by the pilot in the moving jet.

(b) Calculate the frequency heard by the pilot in the stationary jet.

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

What happens to an isotope during radioactive decay?

When electrons are added to the outermost shell of a carbon atom, it forms--an anion that has a larger anion that has a smaller cation that has a larger cation that has a smaller radius.