Physics 9-27-22 Relative Motion

PHYSICS – Great discussion of relative motion today! You know, we’ve done most of this already. The only new part is the motion of objects in the same direction and opposite directions, relative to each other.

Don’t forget, you’ll use what you learned about vector addition to work those “boat goes across a river” and “plane experiences a head wind” types of problems.

In case you want them, here are the answers to tonight’s problems.

41. a. 70 m/s east
b. 20 m/s
43. a. 10.1 m/s at 8.53° east of north
b. 48.8 m
44. a. 14.1° north of west
b. 199 km/h
45. 7.5 min
46. a. 23.2° upstream from straight across
b. 8.72 m/s across the river
50. a. 22.2 s
b. 2.00 × 102 s
52. 22.5 s
54. 70. s

flickr photo by raysto

Chemistry 9-27-22 Lighting a Bunsen Burner

CHEMISTRY – Great job lighting Bunsen burners today! By the way, did you happen to see a green flame when you put the copper wire in the flame? The electrons in the copper atoms were being excited and they gave off a green flame. Cool!!

Here’s something you will find useful in the future…everything you wanted to know about a Bunsen burner and how to light it. Be sure and view the slide show BEFORE you take turn in your lab sheets and take the test.

Next week we’ll continue with Parts 4 & 5. Be sure and read ahead before you come to class! Also, make double dog sure you are keeping up with the observations and answering ALL of the questions at the end of the lab on pg. 12- 17. There are a TON of them!!!