A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down to the victim with an initial velocity of 2.30 m/s and observes that it takes 1.9 s to reach the water. A) List the knowns in this problem. 1. a2. v3. t 4. vo5. yB) How high (in m) above the water was the preserver released?

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.

The ozone hole appears in antarctica during

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.