i took physics class by correspondance so i can get a better grade, now i have a few few per module (modules consists of over 50 odd questions), please just point me in the right direction and i'll do the rest, thx, some may seem pathetic though, but i want to get good marks so i dont want any question un-answered(adsbygoogle = window.adsbygoogle || []).push({});

Module2,

1b: a box has 3 ropes tied to it, 3 guys exert the following forces.

F1= 220N at 90degrees

F2= 185N at 162degrees

F3= 235N at 280degrees

determine magnetude and direction of the box.

5c: a marble with mass of 32g at speed of 24cm/s hits directly at a stationary smaller glass marble with mass of 15g, after glass marble moves with speed of 30cm/s

if collision perfectly elastic, determine the velocities of both marbles.

Module 3

3: a charged object(qa=-3.6uC) is a corner af a right triangle, (qb=+2.5uC, 2m due east of qa) and (qc=+2.5uC, 2m due south of qa)

i found the resulting force Fr=4,09x10power of -4 N

now i have to find the angle, but since its a decimal i cant do sin-1 on my calculator, any help

4d: a charged bal is suspended by an insulated thread, 45cm from a source charge. with this info (gravity(g), the angle(o), and mass(m)) derive an equation to find Ft(force of tension by thread).

i came up with Ft=mg x cos(o)

5:a dust spec is in a electric field, E=2.50N/C to the right, dust spec has a charge of +13uC and mas of 5.25mg

i found the accelaration, but i cant find the direction with calculation, only by comon sens.

Module 4

these ones are iffy, try not to give me the answer

2a: an electron is in an electric field, he travels from one plate to the other, what type of motion, suport answer with Newtons law.

that is the direct question, tell me what you can

3c: a positivly charged particle enters an electric field horizontaly and it is atracted by one of the plates

what type of motion, suport answer with Newton's law.

same deal here, this is the exact question

Module 5

5:the repulsive force between 2 ceramic magnets was mesured and found to be determined by distance (no it doesnt sayhaha sercasm)

distance (mm) force(N)

10 3.93

12 0.40

14 0.13

16 0,057

18 0.03

20 0.018.........and on and on

the question is: does this follow an inverse square law, support with calculations.

i dont know the meaning of inverse square law, and i dont know what calculations to use

Module 6

3b: an aluminum plane is flying due west parallel to the ground at 350m/s, wing span 22m, erth magnetic field 8.30x10to power of -5 T

which wing would be negetively charged, suport answer with diagram. i did every diagram possible, but i dont know how to find the charge.

1a: following statement either incomplete or false, rewrite each statement

the source of all electromagnetic radiation is and accelerating particle.

Module 7

5:in early Millikan experiment, he observed that the following measured charges , among others, appeared at different times on a single oil drop, what value of elementary charge can be deduced from this data?

a 6.65 x 10powerof-19C

b 8.204 x 10powerof-19C

c 11.5 x 10powerof-19C

d 13.13 x 10powerof-19C

e 16.48 x 10powerof-19C

f 18.08 x 10powerof-19C

g 19.71 x 10powerof-19C

h 22.89 x 10powerof-19C

i 26.13 x 10powerof-19C

i need to set up a chart, and i should explain the rational behind each calculation, but i dont know where to start.

5:sun taning produces cell damage in the skin, why is UV light capable in doing so, and not infrared radiation

6: certain types of black-and-white film are not sensitive by redlight, they can be devloped usinf red safe light, explain this on basis of photon theory of light.

Module 9.............. still to come.

take your time, take a day or 2 thx in advance

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Lots of physics problems

**Physics Forums | Science Articles, Homework Help, Discussion**