You are at the edge of a cliff. You whistle and hear your echo in 2.5 seconds. Assuming the speed of sound at that location is 340 m/s; what is the height of the cliff? [height] Answer is in meters.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

The a992 steel rod bc has a diameter of 50 mm and is used as a strut to support the beam. determine the maximum intensity w of the uniform distributed load that can be applied to the beam without risk of causing the strut to buckle. take f.s. = 2 against bucklin

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?