Physics - February 2007

How much does it cost to drop an atomic bomb?

2007-02-23 08:49:39 · 5 answers · asked by Anonymous

as zero=null numerical volume and one= quantity/entity without companion

2007-02-23 08:45:35 · 3 answers · asked by Book of Changes 3

A proton moving freely in a circular path perpendicular to a constant magnetic field takes 1.40 µs to complete one revolution. Determine the magnitude of the magnetic field.

2007-02-23 08:41:49 · 3 answers · asked by Livelife 1

A sound wave at 1000Hz is sent out from a stationary source toward a target approaching at 20.0m/s. What will be the frequency of the returning signal? Take the speed of sound to be 340m/s.

2007-02-23 08:34:41 · 1 answers · asked by hpage 3

I know how does surface tension works, and i know detergents are surfactant, but I don't know why they reduce surface tension in water

2007-02-23 08:01:18 · 6 answers · asked by Anonymous

A car of mass 1200 kg, towing a carvan of mass 800 kg, is travelling along a motorway at a constant speed of 20 m/s. There are resistance force on the car and the carvan ,of magnitude 100 N and 400 N respectively.Calculate the magnitude of the force on the carvan from the towbar,and the driving force on the car.
The car brakes suddenly, and begins to decelerate at the rate of 1.5 m/s^2. Calculate the force on the car from the towbar. What effect will the driver notice?

2007-02-23 07:51:18 · 1 answers · asked by amjad 1

What stable metals, if any, are fairly good at absorbing alpha radiation from u238 and releasing a neutron in response?

2007-02-23 07:47:29 · 2 answers · asked by - 3

2007-02-23 07:47:22 · 6 answers · asked by Anonymous

I keep hearing that how you see things changes with Quantum theory what da hell does that mean and is it real? If it's real doesn't that mean how you see things in like is what you get?

2007-02-23 07:45:47 · 5 answers · asked by Believe me 3

2007-02-23 07:42:32 · 14 answers · asked by STEPHEN W 1

2007-02-23 07:39:43 · 6 answers · asked by STEPHEN W 1

A 75.0 kg stunt man jumps from a balcony and falls 20.5 m before colliding with a pile of mattresses. If the mattresses are compressed 0.900 m before he is brought to rest, what is the average force exerted by the mattresses on the stuntman?
_____ N

2007-02-23 07:36:40 · 6 answers · asked by Anonymous

From the instant that a pile driver of mass 2000 kg comes into contact with a pile of mass 600 kg,they move vertically downwards together,with common deceleration 0.8 m/s^2 until they come to rest.Make separate sketches showing the forces acting on the pile-driver and on the pile.
Find the magnitudes of all the forces exerted on the pile
a) when it is moving
b)after it has come to rest

2007-02-23 07:30:11 · 2 answers · asked by amjad 1

frictionless pulley. the pulley is pulled up with a force F = 50 N. what are the acceleration of teh two masses with respect to the ground?

2007-02-23 07:10:13 · 5 answers · asked by Varun S 1

pulled horizontally by a force of 30 N. what is the tension in the cord connecting them?

2007-02-23 07:07:31 · 3 answers · asked by Varun S 1

If the car accelerates from a traffick light at 4.9 m/s2, what angle will the string make with the vertical?

2007-02-23 07:05:18 · 2 answers · asked by Varun S 1

2007-02-23 06:42:40 · 6 answers · asked by STEPHEN W 1

2007-02-23 06:09:14 · 14 answers · asked by Anonymous

or would flatation be same regardless of inside pressure?

2007-02-23 05:32:25 · 7 answers · asked by Anonymous

2007-02-23 05:12:16 · 8 answers · asked by Anonymous

Consdier four vectors with magnitudes of f1 = 49 N , f2 = 32N, f3= 28 N, f4= 41N. Let θ1 = 120 , θ2 = -150, θ3=31 , and θ4= -63, measured form the positive x axis with the counter clockwise angulare direction as postive.

What is the magnitude of the reultant vector F , where F=f1+f2+f3+f4. ANswer in units of N.

What i did was i took the sin θ of each and multiplyed by the magnitudes and added them im not sure if that is right but i got answer of 4.325043791.

If that is the right answer how do i get direction
What is the direction of this resultant F. Give the angle in degrees, use counterclockwise as the postive angular direction, between the limits of -180 and 180 from the postive x axis.

2007-02-23 04:48:32 · 4 answers · asked by njbadboy4life2005 3

2007-02-23 04:30:41 · 4 answers · asked by Asdfjkl Z 1

2007-02-23 04:24:12 · 2 answers · asked by sri7_ram 2

At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. The length of each rod can be adjusted to be one-sixth of a wavelength of an electromagnetic wave whose frequency is 65.0 MHz. How long is each rod?

2007-02-23 04:19:19 · 3 answers · asked by christian m 2

Means why the same force cant make it to move anticlockwise ? What cause the same force to make earth move in clockwise only ?

2007-02-23 04:09:00 · 8 answers · asked by Sonu 2

electricity

2007-02-23 04:04:52 · 2 answers · asked by Anonymous

2007-02-23 04:03:32 · 2 answers · asked by goring 6

My brother cant understand, that you would not move and wont take my word for it so can someone please explain it to him

as he seems to think that if the van is moving and you jump the van will move past your feet and you would not land in the same place

2007-02-23 04:02:50 · 20 answers · asked by Glenn H 1

2007-02-23 03:59:35 · 2 answers · asked by Steven A 1

a) Assuming an atmosphere with no wind and a perfectly smooth pavement.

b) Assuming no atmosphere

2007-02-23 03:56:36 · 6 answers · asked by Anonymous