the day before the test (space exploration)

hey everyone! =) aebe here...
and this is what we did today.

first, we went over the problems on page 172 ( #'s 17,20,21,22,27) and here are the answers:


17. 1.989 × 10^30 kg
20. a. 3070.5 m/s
b. 86400s -> 8.66 × 10^4s or 24 hrs
21. a. 7348.469 s
b. 1508 m/s
22. a. 0.18676 m/s
b. 15.87 N
27. a. 2.03 × 10^20 N
b. 2.62 × 10^-3 N/kg


after doing the problems, ms. k went over the hand out GRADE 12 PHYSICS: GRAVITY AND APPARENT WEIGHT. then we had the review for the test tomorrow. the class ended of with ms. k showing us a video (i forgot the title.. sorry).

oh yeah... it wasn't shown in the slides... but i think ms. k said to read/study/review micro-gravity, hazzards, space exploration and why is the satellite stay in orbit.



that's all for tonight. =)
good luck for tomorrow's test! =)



next scribe.... kevin.

friday-april 25, 2008

ooohhh... nobody posted anything for last friday... sooo.. here goes. =)

friday-april 25, 2008

sub- mr. babisky

we went over the other side of the study guide- 8.2 USING THE LAW OF UNIVERSAL GRAVITATION

here are the answers

MOTION OF PLANETS AND SATELLITES

1. parabolic
2. vertical
3. horizontal
4. horizontal
5. Earth
6. orbit
7. uniform circular motion

WEIGHT AND WEIGHTLESSNESS

1. acceleration
2. inverse
3. 2nd
4. decreases
5. freefall
6. upward
7. weightless

THE GRAVITATIONAL FIELD

1. gravitational field
2. gravity
3. inversely
4. square

EINSTEIN'S THEORY OF GRAVITY

1. force
2. space
3. curved
4. accelerated
5. relatively
6. sun
7. blackhole
8. mass


** after going over the study guide he gave us a little time to finish up the sheets- CHAPTER 11: GRAVITATIONAL INTERACTIONS and INVERSE-SQUARE LAW. after 20 mins or so, we went over these sheets.

here are the answers

CHAPTER 11: GRAVITATIONAL INTERACTIONS

1. 4F
2. 4F
3. 16F
4. stays the same
5. 2/9F
6. stays the same

INVERSE-SQUARE LAW

1. 9 area units - 1/9 mm thick
16 area units - 1/16 mm thick

2. 25 meter squared
100 meter squared


**after the sheets he gave us an assignment--- page 160 practice problems 1-4 and page 172 problems 1-5 (from the green book) for the remaining time we had.


i guess that's what we did last friday... =)

Equilibrium Problems and Inclined Planes

We had a lot done in class today. First, we continued in going through the PHYSICS 40S INTRODUCTORY UNIT WORKSHEET: VECTORS (numbers 4-8). Next, we went through the questions at the last page of the DYNAMICS UNIT-EQUILIBRIUM handout. ALL ANSWERS ARE ON THE SLIDES POSTED BY MS. K.

After going through the sheets, Ms. K started discussing about INCLINED PLANES. After that, she told us to read pages 194-196 from the book and solve the problems on page 196, 1-4.

Here are the questions:

1.A copy of Physics: Concepts and Connections leaves the printing press and slides down a 4.0-m-long ramp into the arms of an eager physics student. If the ramp is inclined at an angle of 250 to the horizontal and has a coefficient of kinetic friction of 0.10, how long will it take the 2.0-kg textbook to reach the student?

2.The plastic case from your least-favourite CD recording is flung up a frictionless ramp, inclined at an angle of 200 to the horizontal. If the case leaves your hand at a speed of 4.0 m/s, how long will it take before the case comes to rest?

3.A skateboarder slides down a frictionless ramp inclined at an angle of 300 to the horizontal. He then slides across a frictionless horizontal floor and begins to slide up a second incline at an angle of 250 to the horizontal. The skateboarder starts at a distance of 10m from the bottom of the first incline. How far up the 2nd incline will he go if the coefficient of kinetic friction on the 2nd incline is 0.10?

4.Batman is driving the Batmobile down a hill coming from the Bat cave. The hill is inclined at an angle of 300 to the horizontal and has a coefficient of kinetic friction of 0.28. What force must the Batmobile’s engine apply to cause the Batmobile to accelerate at 0.60g?

The DYNAMICS SHEET IS DUE ON THURSDAY guys!!!
That’s all for today/tonight… have a good night. =)





next scribe....FebiO