Q.8 All bodies dropped together fall to the ground in the same amount of time. But if
two spheres roll down an inclined plane, one may take more time than the other.
Explain why.
Q.9 Ship designers want to keep the CG of their ships as low as possible. Why? Discuss
why there is a contradiction between this requirement, and other requirements.
2007-04-15 05:37:23 · 8 answers · asked by unbousom 1 in Science & Mathematics ➔ Physics
Q8 Is incorrect due to the fact that it does not take air resistance into account.
If you have 2 rocks that weigh the same:
The rock dropped from a plane drops faster than
the rock attached to an open parachute dropped from the same plane at the same altitude.
The rock attached to the parachute weighs more (by the weight of the parachute.)
.
2007-04-15 05:51:03 · answer #1 · answered by Anonymous · 0⤊ 1⤋
(A) The larger one will have more rotational inertia and thus not start rolling as quickly.
(B) A lower CG means that the ship is harder to capsize (turn over) in rough seas. But, by doing this, they force the hull to assume a narrower cross section so both the water friction and the amount of draft (water required under the vessel) are increased.
HTH
Doug
2007-04-15 05:57:30 · answer #2 · answered by doug_donaghue 7 · 0⤊ 0⤋
Q.8. The moment of inertia of the spheres may be different (if, for example, one is a solid sphere and the other a hollow ball).
Q.9. By keeping the CG low on a ship it prevents the ship from turning over. If it does turn over, it will tend to correct itself. This, however, provides less stability over a very 'flat' bottomed boat. A 'flat' bottomed boat (like a raft) is less likely to capsize but if it does, it will stay capsized.
2007-04-15 05:51:51 · answer #3 · answered by Crazy Malamute 3 · 1⤊ 0⤋
First, there's a flaw on your preliminary assertion. All bodies fall to the floor with the same *acceleration* (or interior the same time from the same height) on condition that air resistance is ignored. If one physique has drastically extra drag then yet another it is going to take longer to fall. relatively, acceleration below gravity is persevering with (and self sustaining of mass) yet gravity won't be the only stress in touch. Now, on on your question. contained in relation to spheres rolling down a airplane, the two chief forces are gravity and friction. If the two spheres journey the same friction stress, then they'd desire to the two roll to the backside of the airplane interior the same time. Friction stress is regularly represented as uR - u is a coefficient of friction which relies upon on the substances in touch. R is a reaction stress - that's regularly the reaction to the area of the load appearing perpendicular to the airplane and so relies upon on the mass of the sector. So if fact be told, if the spheres variety drastically in mass there could be a distinction in friction forces and so the time to roll to the backside would be distinctive.
2016-11-24 20:13:38 · answer #4 · answered by Anonymous · 0⤊ 0⤋
8. Friction (as noted above)
9. So it doesn't capsize.
2007-04-15 05:46:36 · answer #5 · answered by Anonymous · 0⤊ 0⤋
A8. Friction.
2007-04-15 05:44:34 · answer #6 · answered by Anonymous · 0⤊ 0⤋
8. Since the spheres are different sizes, they would have different momentums. One would roll faster and the other would roll slower.
2007-04-15 05:45:54 · answer #7 · answered by scorpion43_db 3 · 1⤊ 1⤋
give me the answers ofthese questions.
2007-04-18 20:40:08 · answer #8 · answered by numb... 1 · 0⤊ 0⤋