Dr. Brahim and her band, Test Tubes, played every weekend before the pandemic at a sold-out venue in Vegas. The lead instrumentalist used a test tube
(closed-end air column) with a 17.2 cm air column. The speed of sound in the
test tube is 340 m/sec. Find the frequency of the first harmonic played by this
instrument.

Suppose you were asked to find the torque about point p due to the normal force n in terms of given quantities. which method of finding the torque would be the easiest to use?

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.