coneptual questions here..help me pls..?

Question

1. Explain why a motorcycle is tilted as it rounds a curve.
2. Explain why a clothesline with a wet towel hung at the center of the line cannot remain stretched taut between two poles.
3. The mass of the moon is about 1% that of the earth. Is the centripetal force that keeps the moon in its orbit around the earth much smaller than, the same as, or much greater than the gravitational force exerted on the moon by the earth?
4. Give one example in which the distance traveled is a significant amount yet the corresponding displacement is zero.
5. Give one example of a physical system where a particle moves at constant velocity while at the same time has acceleration.
6. Explain the difference of a conservative and a non-conservative force and give one example of each.
7. When you climb a mountain, is the work done on you by gravity different if you take a short, steep trail instead of a long, gentle trail? If not, why do you find one trail easier?

8. When you catch a baseball, a force is applied on your hand. When you throw a basketball towards the basket, a force is applied on the ball. Explain the origin of this force.
9. Explain how recoil of a rifle is related to momentum conservation?
10. Two bowling balls are moving with the same velocity, but one just slides down the alley, whereas the other rolls down the alley. Which ball has more energy?

Answer 1

No offence, but this is obviously your Physics home-work. Do you even bother going to class? Since you don't seem to be able to answer any of these questions. I think it would be wrong to give you the answers. Time you opened up your book, since people simply giving you the answers will not help you in any examination.

Answer 2

1. So that the centrifugal force is balanced by gravity and the rider doesn't fall over.
2. Because if it were perfectly straignt, the tension exerted on it would be infinite (it's a 1/cos(Φ) thing)
3. It is the same as. If it wasn't, the Moon would either crash into the Earth or fly off into space. (And that's not quite true since the Moon -does- move an inch or so closer every year)
4. Get up from your chair and go get a cup of coffee. When you come back your displacement is zero.
5. Something in orbit has a constant velocity and a constant inwards acceleration.
6. A conservative force is one in which energy is stored and can be released at a later time, a non-conservative force cannot store energy. How about a spring and a ball of putty?
7. The work done -by- you -against- gravity is exactly the same if you height changes by the same amount. (Gravity only does work
-on- you as you come down) You find the gentle trail easier because it requires less power (which is energy expended per unit of time)

Doug