A difference in density between gases creates buoyancy, which is the ability of an object to float. At 0 degrees, helium has a density of 0.18 kg/m ^3. At 0 degrees, regular air has a density of 1.29 kg/m^3

In kilograms, how much mass can a cubic meter of helium float in regular air at 0 degrees

The krasnapolski is a top-of-the-line hotel in amsterdam, the netherlands. among their many services, they rent bicycles to guests. the bicycle checkout is open 24 hours per day 7 days per week and has 50 bicycles on hand. on average, 10 guests request a bicycle each day, arriving completely randomly at all times of the day during the spring and summer seasons. guests keep bicycles for four days on average, with a standard deviation of two days. how long does a guest on average have to wait for a bike? a. approximately 24 hours b. approximately 0.033 hours c. approximately 4 days d. approximately 47 minutes