Okay, I need help on a lot questions. I most of the math parts, but this stuff just completely confuses me. Any help will be greatly appreciated. Please help me not fail my class. Work/Energy Two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Assuming the hay exerts a constant frictional force on the arrows, the faster arrow will penetratehow much farther than the slower arrow? Explain. Why is it easier to climb a mountain via a zigzag trail rather than to climb straight up? You can use a plley and ropes to decrease the force needed to raise a heavy load. But for every meter the load is raised, how much rope must be pulled up? Account for this using energy concepts. Fluids A small amount of water is boiled in a one-gallon gasoline can. The can is removed fromt he heat and the lid is put on. Shortly thereafter the can collapses. Explain. Explain how a siphon can transwer liquid from one container to a lower one even though the liquid must flow uphill for part of its journey. Will an ice cube float in a glass of alcohol? Why or why not? Will an empty balloon have precisely the same apparent weight on a scale as one that is filled with air? Explain. Does the buoyant force on a diving bell deep beneath the ocean have precisely the same value as when the bell is just beneath the surface? Explain. Explain why helium weather balloons, which are used to measure atmospheric conditiosn at high altitude are normally released while filled only 10%-20% of their maximum volume. Roofs of houses are sometimes "blown" off (or are they pusshed off?) during a tornado or hurricane. Explain, using Bernoulli's principle. If you dangle two pieces of paper vertically, a few inches apart, and blow between them, how do you think the paper will move? Try it and see. Explain. With a little effort, you can blow across a dime on a table and make it land in a cup without touching either cup or dime. Explain (and try it). Temperature/Kinetic Theory Which has more atoms: 1 kg of iron or 1 kg of aluminum? A flat bimetallic strip consists of aluminum riveted to a strip of iron. When heated, which metal will be on the outside of the curve? Explain why it is advisable to add water to an overheated automobile engine only slowly, and only with the engine running. When a cole mercury-in-glass thermometer is first placed in a hot tub of water, the mercury initially descends a bit and then rises. Explain. Escape velocity for the Earth refers to the minimum speed an object must have to leave the Earth and never return. The escape velocity for the moon is about one tenth what it is for the Earth since the Moon is smaller. Explain, then, why the Moon has practically no atmosphere.