Guitar string has a frequency of 440 Hz and a damping time of 2.2 sec. How many oscillations does the string make before the oscillation amplitude has decreased to half of the original value? If the initial amplitude of the guitar string was 1.9 mm, how large will be the amplitude after 2.1 sec, 4.2 sec, and 8.4 sec?

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

Diverging mirrors and lenses always produce images

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.