Portland, Oregon, has an average of 240 cloudy days per year. Which heating system would be the least likely choice for this environment?

Biotic factors are the blank and blank part of the ecosystem

a. Convert 21.0 cm to inches. Show your dimensional analysis setup. b. Convert 29.7 cm to inches. Show your dimensional analysis setup. c. State the dimensions, in inches, of the international standard for a letter-sized piece of paper. d.

Mechanical advantage is a measure of how much a machine multiplies the input A) efficiency. B) force. C) power. D) work.

Give two disadvantage of hydroelectric power

A 72 kg skydiver can be modeled as a rectangular "box" with dimensions 21 cm * 41 cm * 170 cm. if he falls feet first, his drag coefficient is 0.80. part a what is his terminal speed if he falls feet first? use ρ = 1.

Recent measurements of the expansion rate of the universe reveal that the expansion rate of the universe is doing something astronomers did not expect. What is that?

List three machines or devices that depend on gravity to work.

Daily summer solar radiation levels at polar latitudes are caused by the high intensity of radiation per unit surface area rather than by long periods of daylight.

Predict whether the hottest part of a room will be near the ceiling, in the center, or near the floor, given that there is a hot-air vent near the floor.

Does light always travel at the same speed?