A student blows over a straw that is open at both ends. If the wavelength of the note produced was 30 cm, how long was the straw?

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.