A balloon contains two gases: oxygen and nitrogen. According to the second law of thermodynamics, which event can never occur spontaneously? A. molecules of the two gases mixing evenly throughout the balloon

B. molecules of the two gases leaking out small openings in the skin of the balloon

C. molecules of the two gases traveling at a variety of speeds

D. molecules of the two gases separating to opposite ends of the balloon

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec