Physics - February 2007

2007-02-07 08:28:24 · 4 answers · asked by Anonymous

2007-02-07 08:27:01 · 36 answers · asked by Anonymous

A mobile consists of 2 very lightweight bars of lengths l = 0.650 m (blue) connected to each other and the ceiling by vertical strings. You may neglect the mass of the bars and strings in the following. From these bars hang three objects, also suspended by strings. The masses of objects 1 and 3 are: m1 = 6.00 kg and m3 = 3.00 kg. The distance x shown in the drawing is 0.260 m.

What is the mass m2?

2007-02-07 08:26:04 · 2 answers · asked by adam s 1

A rescue plane flies horizontally at a constant speed, searching for a disabled boat. When the plane is directly above the boat, the boat's crew blows a loud horn. By the time the plane's sound detector perceives the horn's sound, the plane has traveled a distance equal to one-half its altitude above the ocean. Determine the plane's altitude.
A. 105 m
B. 652 m
C. 617 m
D. 422 m
E. 525 m

plz show me how u did it

2007-02-07 07:12:57 · 1 answers · asked by *TurKisH sUnLighT* 2

2007-02-07 07:11:36 · 4 answers · asked by big baby 1

A 195kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 29.1degrees with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.813, and the long has an acceleration of 0.694 m/s^2. Find the tension in the rope.

2007-02-07 06:49:25 · 2 answers · asked by Psychotic Bunnie 1

A block of mass 8.00 kg is pushed up against a wall by a force P that makes a 50.0° angle with the horizontal. The coefficient of static friction between the block and the wall is 0.275. Determine the possible values for the magnitude of P that allow the block to remain stationary.
N (maximum)
N (minimum)

2007-02-07 06:45:27 · 1 answers · asked by tnhoots 1

i set up a Wheatstone bridge with a standard resistor, and a galvanometer. i put a 15cm long wire in the setup and varied the galvanometer to a point where it did not deflect. i did this for varied lengths of the wire, l, and recorded the lengths of no deflection. then i found their mean lx.

i then interchanged the resistor and the wire and repeated the process. again i found the mean of varied galvanometer lengths, ly. then i found the ratio lr = lx/ly

i then plotted l vs lr.

how do i find the resistivity of the wire?

i know the wire's cross sectional area.

2007-02-07 06:37:21 · 2 answers · asked by AJ N 2

the problem asks: the 1.20 kg head of a hammer has a speed of 8m/s just before it strikes a nail and is brought to rest. Estimate the temperature rise of a 14 g iron nail generated by 10 such hammer blows done in quick succession. Assume the nail absorbs all the energy.

I'm not asking for anyone to solve this problem for me, all i ask for is for someone to explain the steps i need to take in order to find the temperature rise...


thank you for alll of your help!

2007-02-07 06:12:27 · 3 answers · asked by Anonymous

2007-02-07 06:07:02 · 6 answers · asked by Ron 1

To clarify...How come when the fly is soaring outside in front of my car, it can get hit and crushed by the windshield; but once it's floating inside my car, it can soar in the air without getting hit and crushed by the seats or whatever's inside my vehicle?

I know this is a typical question, but what's the explanation again? Is it because the air, and everything else in the car, is traveling in the same speed as the vehicle?

2007-02-07 05:53:00 · 5 answers · asked by Roland 4

what will happen to the velocity,when you shoot a body with a velocity higher than its escape velocity in the intersellar space?

2007-02-07 05:48:36 · 1 answers · asked by jiten2u 1

2007-02-07 05:19:50 · 6 answers · asked by tom 1

2007-02-07 05:15:20 · 5 answers · asked by Anonymous

i need graphical...

2007-02-07 05:06:51 · 3 answers · asked by steve 2

If we put a conductor between two oppositely charged particles, what will equipotential lines look like?

2007-02-07 04:52:56 · 4 answers · asked by Anonymous

Question Details:
The two strands of the helix-shaped DNA molecule (the genetic matieral in living cells) are held together by electrostatic forces as shown. Assume that the net average charge indicated on H and N atoms is effectively 0.2e, and on the indicated C and O atoms is 0.4e, that atoms on each molecule are seperated by 1.0 X 10^-10 m, and that all relevant angles are 120 degrees. Estimate the net force between:
(a) a thymine and anadenine; and
(b) a cytosine and a guanine
(c) Estimate the total force for a DNA molecule containing 10^5 pairs of such molecules.

The answers in the back of the book are


a) 3 x 10 ^-10 N

b) 7 x 10^-10 N

c) 10 ^-4 N

Thanks for your help....

2007-02-07 04:51:09 · 1 answers · asked by crockett_1969 2

2007-02-07 04:25:58 · 5 answers · asked by Anonymous

2007-02-07 03:44:26 · 8 answers · asked by bihariraja 3

2007-02-07 03:33:30 · 5 answers · asked by veda 1

A picture of an atom.

2007-02-07 03:32:57 · 13 answers · asked by Amber H 1

If you knew w/mathamatical precision and scientific certainty that their would be a great calamitous event on Mother Earth Dec.21,2012,would you live life to the fullest,or expend your resources to try to survive and propagate the species?

2007-02-07 03:27:31 · 8 answers · asked by Anonymous

When two 2 objects (one weight 1 lb. the other weighing 1/2 lb.), when propelled vertically with the same force, from the same launch pad, why does the heavier object travel higher?

2007-02-07 03:16:31 · 6 answers · asked by mountainfiremarshall 1

If you drill a hole through the centre of the earth to the other side and there was no chance that you would die, what would happen? Would you pop out the other side, or stay in the middle, taking gravity into account.

2007-02-07 03:15:33 · 8 answers · asked by Anonymous

Determining periods for simple harmonic motion

2007-02-07 03:03:58 · 3 answers · asked by kak 1

A) absorb energy

B) become unstable

C) neither absorb nor give off energy

D) give off different amounts of light energy

E) none of the above

2007-02-07 03:01:44 · 7 answers · asked by Max 1

what is the source of a continuous spectrum? what is the source of a line spectrum? What kind of info does each give?

2007-02-07 02:56:32 · 3 answers · asked by Lou 1

2007-02-07 02:42:40 · 3 answers · asked by paritosh k 1

2007-02-07 02:41:24 · 6 answers · asked by paritosh k 1

I need the correct definition for pressure .

2007-02-07 02:28:57 · 5 answers · asked by Anonymous