Two bicyclists ride towards each other along a long straight road, each with a constant speed of 10 km/h. when they are 20 km apart, a bee begins flying from the front of one bicycle towards the other at 30 km/h. when the bee reaches the other bicycle, it immediately turns around and starts flying back towards the original bicycle at the same speed. this repeats until the bikes crash into each other and the bee is squished.
a. how many trips does the bee travel before it gets squished?
b. for how long will the bee survive?
c. what is the total distance the bee will travel?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

What is the measurement of how fast an object moves relative to a reference point?