Silver has a density of 10.5g/cm3. Aluminum has a density of 2.7g/cm3. If you have a 2cm x 2cm x 2cm cube of a silver metal that has a mass of 21.6g, is it aluminum or silver?

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

When does your body conduct current more readily?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90