What is the frequency of a ships whistle if the velocity of sound is 340meters/seconds and the wavelength is 1.70 meters

a.) 200 hertz
b.) 253 hertz
c.) 340 hertz
d.) 532 hertz

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

What is special about a dc circuit ?

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.