You drive along on a straight road at 20 m/s. The light in front of you turns red and you brake with a constant acceleration. You come to a stop after traveling a distance of 15 meter. Assume you started out driving in the positive direction. a. What is the acceleration of the car?
b. How much time did it take to comes to a stop?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.