Wednesday, November 19, 2008

So by the blog, apparently Dana was supposed to be scribe, but upon my arrival to class, (Which was delayed due to my Phys Ed. Class, which took place at Sargent Pool) apparently Tony was chosen to be scribe, and since it was his birthday (which for some reason acts as a power of Veto), it was passed on to me. Honestly now.


Anyways, We basically went over the worksheets Ms. K assigned us the day prior. Mrs. Karras was also substituting.

Answers:

Study Guide 8

21) Cavendish used a rod with a ball on it, suspended from a thin wire. It also included a Large ball, a support, a mirror and a light source.









22) Force of attraction between the large and small balls caused the rod to rotate. It stopped rotating only when the force required to twist the wire equaled the gravitational forces between the balls.

23) F = G(M1*M2)/d^2 --> G = F*d^2/M1*m2 --> (6.67 *10^-11N)(1m)^2/(1kg)(1kg) = 6.67*10^-11 N*M^2/kg^2

Moving on, we went over the Chapter 11: Gravitational Interactions worksheet.

So since we know that if either mass in the equation for the law of universal gravitation is doubled, the force is doubled. Also we know that if the distance doubles, the force is one fourth of the original force.

1) If both masses are doubled, the force quadruples.

2) If the masses are not changed, but the distance of separation is reduced to 1/2 to the original distance, the force gets quadrupled.

3) If the masses are not changed, but the distance of separation is reduced to 1/4 the original distance, the force is sixteen times as much.

4) If both masses are doubled, and the distance of separation is doubled, the force remains the same.

5) If one of the masses is doubled, the other remains unchanged, and the distance of separation is tripled, the force is 2/9 of the original force.

6) The force remains the same (Force would be multiplied by 9, but because the distance is multiplied by 3, the force would be reduced to 1/9th of the original, keeping the force the same)

We then went over the Universal Law of Gravitation worksheet.

1) 7.41 * 10 ^-14 N

2) 81.82kg (In my case)
b)801.8 N (In my case)
c)180 lbs (In my case)

3)
a) Doubled
b) One quarter times
c) Four Times
d) Sixteen times

4) 1.62 * 10 ^ 6m

We were then handed a transparency sheet, which was later handed the same day. We were also given a Gravitational Fields worksheet, that would be due tomorrow I assume.

Next scribe is Tony.