Running late to work, Mr. Linares drops his keys from the top of the second floor stairwell and they fall straight down to the ground level. It takes about 1.8 s for the keys to hit the floor. How high did the keys fall from?

Which of the following statements are evidence that gases do not always behave ideally? check all that apply.? a. co2 gas becomes dry ice (solid co2) at 1 atm and –78.5 °c. b. when two gases are mixed, they follow dalton\'s law of partial pressures. c. at 4 k and 1 atm, helium is a liquid. d. it is impossible to compress a gas enough so that it takes up no volume.

What is the relationship between wavelength of light and the quantity of energy per photon?

2) the sun is wonderful source of energy. it is renewable and natural with few dangers. solar cells rely on the sun for energy. these cells would be more practical to use if they were