You blow across the open mouth of an empty test tube and produce the fundamental standing wave of the air column inside the test tube. the speed of sound in air is 344 m/s and the test tube acts as a stopped pipe. if the length of the air column in the test tube is 15.0 cm , what is the frequency of this standing wave? what is the frequency of the fundamental standing wave in the air column if the test tube is half-filled with water?

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

Which notation is used to represent an alpha particle? a. b. c. d.