Physics - February 2007

A rescue cable attached to a helicopter weighs 2lb/ft. A 190 pound man grabs the end aof the rope and is pulled from the oceaninto the helicopter. How much workis done in lifting the man if the helicpter is 40 ft above the water.

190 + 2 x 40 for the cable = 270 x 40 = 10,800 but I have a bad feeling I am leaving something out.

The answer I get is 10,800 ft pd but I would like a check for confidence. Thanks

2007-02-24 12:10:35 · 4 answers · asked by Anonymous

2007-02-24 12:10:27 · 1 answers · asked by joy 1

2007-02-24 12:07:46 · 6 answers · asked by damn2smart 1

An ocean wave has a length of 12.0 meters. A wave passes a fixed location every 3.0 seconds. What is the speed of the wave?

This problem seems easy.
But I'm confused. Please help.

2007-02-24 11:29:42 · 5 answers · asked by vicky p 1

I need a catchy, clever title..something the judges will remember. My project is on light refraction through various mediums.. also can you recommend how i should start my analysis and what to include..?? please

2007-02-24 11:26:09 · 4 answers · asked by Anonymous

F1->P->F2 as 20

2007-02-24 11:14:24 · 1 answers · asked by juliandbn 1

2007-02-24 11:10:50 · 3 answers · asked by juliandbn 1

2007-02-24 11:09:54 · 3 answers · asked by Anonymous

I mean different forces effect a satellite such as gravitational ,centrifugal and centrepetal forces.but still it revolves its orbit and has equilibrium.what kind of equilibrium it has?we have in the difinition of the equilibrium:
f(total)=0 and M(total)=0 M=momentum.
how about satellites?

2007-02-24 11:06:42 · 4 answers · asked by Emmie s 1

If I have a 1.3 ohm load on a car battery and measure 12.46 volts at the battery terminal and then I also turn on the radio and measure a total of 20 amps of current flowing and now have 12.3 volts at the battery terminals; What is the Thevenin resistance and Thevenin voltage associated with the battery

2007-02-24 11:02:53 · 2 answers · asked by eltel2910 1

A sound wave has a frequency of 192Hz and travels the length of a football field, 91.4m in 0.271s.
A) what is the speed of the wave
B) what is the wavelength of the wave
C) What is the period of the wave
D) If the frequency was changed to 442Hz, what would be the new wavelength and period

2007-02-24 11:02:18 · 3 answers · asked by Anonymous

Which forms where light rays converge?
a) virtual image
b) real image


Which potical device uses mirros and lenses to magnify images of distant objects?

a) reflecting telescope
b) refracting telescope


The two areas in the eye in which light rays are refracted are
a) the cornea and the lens
b. the pupil and the lens
c. the retina and thelens
d. the rods and the cones.

2007-02-24 10:58:40 · 1 answers · asked by maconheira 4

2007-02-24 10:54:41 · 1 answers · asked by Anonymous

how is it? descriptions

2007-02-24 10:48:22 · 5 answers · asked by Anonymous

A skier of mass 50.0 kg is pulled up a snow-covered slope at constant speed by a tow rope that is parallel to the ground. The ground slopes upward at a constant angle of 25 degrees above the horizontal and you can ignore friction.

What is the tension in the tow rope.

2007-02-24 10:38:54 · 2 answers · asked by keenpeach25 2

If sally is travaling 5 miles per houre, and she has 5 bucks and is taviling to a destination 8 miles away, how long will it take her to wast her money on girly nick-nacks?

2007-02-24 10:27:36 · 4 answers · asked by matthew.cain 1

A high speed train travels with an average speed of 227km/h. The train travels for 2 hours. How far does the train travel?

2007-02-24 10:16:16 · 8 answers · asked by Nikki 1

Stange one i know, but thats what a bottle of white does for you!!!!!!! Just been watching a film which had lots of shooting in it, tell me.....if you were to shoot a bullet into the air, at what height would gravity take over and the bullet fall back to earth....AND....at what force would the bullet hit the ground at....as much force as it was first fired, or less??? Now there's a question for you einstein wannabees!!!!!!!!

2007-02-24 10:08:22 · 14 answers · asked by GAZ 1

a) CHCl=CHCl


b) CH2=CH-CHCl2


c) ClBrCHCl


d) (CH3)2C=CH-CH3


e) 1,1-dichloroethene

2007-02-24 09:28:48 · 1 answers · asked by JD 1

4CH2=CHCH3 + 6NO → 4CH2=CHCN + 6H2O + N2

2007-02-24 09:28:00 · 2 answers · asked by JD 1

B C Be N

b) Which of the following has the smallest atomic radius?

Na Al Si Mg

2007-02-24 09:25:04 · 1 answers · asked by JD 1

I need to write a paper on the importance of computational physics in today's society. My general idea of computational physics is that it is a combination of math, computer science and physics. It is important for modeling experimental data. I was wondering if I am on the right track. Is there anybody who knows a lot about this subject? If so pleas just give me your general idea and I can research it further. Thanks.

2007-02-24 09:20:20 · 1 answers · asked by Michael M 4

2007-02-24 08:52:17 · 4 answers · asked by Sonic view 1

Radium undergoes alpha decay. the product of this reaction also undegoes alpha decay. What is the product of this second decay reaction?

2007-02-24 08:45:47 · 3 answers · asked by Anonymous

There are some mystics and holy people who have been seen by other witness testimony

2007-02-24 08:08:57 · 10 answers · asked by denis9705 5

If 2 cars are going at the speed of light and they are going toward each other, will they crash? Or will they just go right tru each other? What will be the impact? ect... Thanks

2007-02-24 07:55:29 · 6 answers · asked by Anonymous

i have a physics paper to write about alternative sources of energy, and one section is to describe a career that one can have in the field (of alternative sources of energy)...
does anyone have any ideas?

and i also need a formula that has to do with the topic and i have to explain the physics involved in alternative sources of energy (what it is, how it works, etc etc)...

so if ANYONE has ANY information, it would be much appreciated!

thanksssssss<3

2007-02-24 07:32:56 · 4 answers · asked by Anonymous

If a postion vs. time plot is rising in time (but not in such a way as to produce a vertical line on the graph) then we can know for certain that ______________________________...?

a) velocity is changing
b) velocity is constant
c)position is constant
d) acceleration is constant
e) acceleration is changing
f) it has a velocity <0 and velocity is changing
g) it has a velocity > 0 but we don't know if the velocity is constant
h) we can't know any of these

2007-02-24 07:28:05 · 2 answers · asked by Anonymous

Jean, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off from Dulles Airport (Fig. 4-55). She notices that the string makes an angle of 29° with respect to the vertical while the aircraft accelerates for takeoff, which takes about 20 seconds. Estimate the takeoff speed of the aircraft.

2007-02-24 07:20:55 · 2 answers · asked by Anonymous

Or how many amps equal a joule?

2007-02-24 07:18:39 · 13 answers · asked by emarri g 1