Physics - January 2007

i forget how to convert weight into mass. how much mass does a 100lb block of ice have? is it 100/9.8 or something? anyway, say it has mass m. how do you multiply this number by the speed of light? and then to multiply it again by the speed of light. what number do you use for the speed of light? does it matter if you use metric or not? the speed of light is a distance over time number. what is the distance measured in, and what unit of time makes his equation true?

2007-01-16 19:00:42 · 4 answers · asked by JizZ E. Jizzy 2

(physics)

2007-01-16 18:36:53 · 5 answers · asked by Anonymous

2007-01-16 18:35:11 · 3 answers · asked by Anonymous

Little has been known whether the contents of the inside of the earth can be exposed by man.

Digging into the earth is a very hard and imposible job so one can dig as deep as possible and then blast the remainder by nuclear. green land is most favored to conduct such experiments as there are no inhabitants.
Has there such event ocurred and if not where on Earth has man been able to dig into the Earth reaching close to the intrior of the Earth?

2007-01-16 18:00:54 · 3 answers · asked by Samasoniasso 1

I know the conservation of energy can be violated for short times, but not overall. is that right?

2007-01-16 17:56:10 · 10 answers · asked by Brian M 1

2007-01-16 17:37:30 · 10 answers · asked by Anonymous

on a hill or the loop a 270 degree angle ??

2007-01-16 17:22:34 · 5 answers · asked by Anonymous

Can someone explain to me how it is theoretically possible to time travel. How can time travel comply with the laws of nature? My friend was trying to explain this to me, but I'm still trying to figure some parts out.

2007-01-16 17:09:45 · 5 answers · asked by micah_09 4

please explain

Given two vectors, one has a magnitude of 3 meters and a direction of 10 degrees and the second has magnitude of 5 meters and a direction 30 degrees. What is the magnitude and direction of their sum? The angles in this problem are relative to the positive x axis.

2007-01-16 17:06:34 · 5 answers · asked by GSU 1

Given a vector with components, x = 2 , y = 5 , find the vector’s magnitude and direction.

please explain

2007-01-16 17:05:16 · 4 answers · asked by GSU 1

If I have a vector with magnitude 2km and a direction of Southwest, what are its components in terms of North and East?

Please explain

2007-01-16 17:03:27 · 2 answers · asked by GSU 1

I love geniuses going against each other's beliefs....

Einstein vs. Bohr...

The relativists vs. the quantum physicists...

Unfortunately I'm with both ends of the line...


Personally, I would go with whatever Einstein say..I especially like his deterministic view of the universe but the quantum physicists really have strong points in their quantum theory....

After Einstein's death, I don't know what had happened with their disputes...did Bohr retracted his claims? probably not because there wouldn't be any quantum mechanics if he did....

2007-01-16 17:01:42 · 8 answers · asked by karl 4

A bicyclist is finishing his repair of a flat tire when a friend rides by at 3.5 m/s. Two seconds later, the bicyclist hops on his bike and accelerates at 3.0 m/s2 until he catches his friend. How much time (in seconds) does it take until he catches his friend?

2007-01-16 16:03:53 · 2 answers · asked by eureka4sureka 1

2007-01-16 15:50:45 · 10 answers · asked by Joe Bloggs 4

Minimum distance may be 1 feet. Laser may not be suitable for my task. Thanx in advance.

2007-01-16 15:15:59 · 2 answers · asked by irf 4

A sprinter can accelerate with constant acceleration for 5.06 s before reaching top speed. He can run the 123.0 m in 17.4 s. What is his speed as he crosses the finish line?

and

A car accelerates at 1.95 m/s2 along a straight road. It passes two marks that are 28.0 m apart at times t=3.80 s and t=4.85 s. What was the car's velocity at t=0?

2007-01-16 14:56:55 · 2 answers · asked by theleprechaunsarecoming 1

Please help me with this problem!!!

A 14700 Newton car is traveling at 25m/s. The brakes are suddenly applied and the car slides to a stop. The average braking force between the tires and the road is 7100 Newtons. How far will the car slide once the brakes are applied?

thanx!!

2007-01-16 14:09:21 · 2 answers · asked by mrsmoan92 3

its a science question

2007-01-16 13:55:24 · 4 answers · asked by Sonny S 1

Two twins one went to work and the other to a mall.

Twn 1 goes to the mall with his friends (minutes pass like they were seconds) because he enters the mall at 6:00 and exits at 8:00. But it feels like it was only 45 minutes in his perspective he feels like going back in again.

Twin 1 enters Mcdonalds at 6:00 and exits at 8:00. he feels like time has stoped for him its going by super slow by the time he gets out hes exhuasted because 2 hrs to him felt like 4hrs he wants to go lay down.

Why is that?

2007-01-16 13:54:19 · 3 answers · asked by APerfectCircle 2

A 0.145 kg baseball pitched at 36.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is 3.00 10-3 s, calculate the average force between the ball and bat during contact

2007-01-16 13:50:09 · 1 answers · asked by nhance13 1

A level flight bomber aircraft, flying at a speed of 125m/s, releases a 'dumb bomb' at an altitude of 1.96x10^3 meters.

a) How far does the bomb travel horizontally between release and impact?
b) How far does the plane trave horizontally during the same time? (assume
level flight the entire time)
c) How long does it take the bomb to impact the ground from release?

Please show work
Thank You any one who takes time to attemp this

2007-01-16 12:59:22 · 2 answers · asked by Rosie 2

which of the following best describes the kinetic energy of each object after a two-body collision if the momentum of the system is conserved?

a. must be less
b. must also be conserved
c. might also be conserved
d. is doubled in value


After collding, objects are deformed and lose some kinetic energy. Identify the type of collision

a elastic
b. perfectly elastic
c. inelastic (i chose this one)
d. perfectly inelastic

2007-01-16 12:52:14 · 2 answers · asked by strawberrylollipop12345 1

2007-01-16 12:51:52 · 1 answers · asked by teddybears 3

A 10N sign is being held up by two strings, A and B. String A is on the left side and angled at 30 degrees and string b is on the right and is horizonta. What is the tension in string B

I need help for my exam, any ideas??

2007-01-16 12:49:06 · 3 answers · asked by Berry 1

Two long parallel wires carry equal currents in opposite directions. (up and down the page, respectively) Wire 1 is to the left of Wire 2 and its current is downwards. Wire 2 has current in the upward direction. Where would a proton moving at a speed of 2 X 10^5 m/s experience a maximum force?

a. between the two wires, moving left towards wire 1
b. to the left of wire 1, moving left
c. between the two wires, heading into the page

Thanks!

2007-01-16 12:33:53 · 4 answers · asked by Wael K 2

Couldn't it be round or something?

http://www.universedaily.com

2007-01-16 12:27:12 · 3 answers · asked by Wayne S 1

2007-01-16 12:26:50 · 2 answers · asked by mohamed a 1

Pretend a person can walk only at a certain pace -- no faster, no slower. If you time her uninterrupted walk across a room of known length, you can calculate her walking speed. If, however, she stops momentarily along the way to greet others in the room, the extra time spent in her brief interactions gives an average speed across the room that is less than her walking speed. How is this like light passing through glass? In what way is it not?

2007-01-16 12:26:23 · 7 answers · asked by Anonymous

When light encounters a material, it can build up vibration in the electrons of certain atoms that may be intense enough to last over a long period of time. Will the energy of these vibrations tend to be absorbed and turned into heat, or absorbed and reemitted as light?
(a)absorbed and converted into light
(b)absorbed and turned into heat

In what direction is the polarization of the glare that reflects from a horizontal surface?
(a)horizontal
(b)neither; light is blocked
(c)vertical

You can get a sunburn on a sunny and on an overcast day. But you cannot get a sunburn if you are behind glass. Explain.

How long does light take to travel from the sun to Earth?
min
From the star Alpha Centauri to Earth?
yr

Why would you expect the speed of light to be slightly less in the atmosphere than in a vacuum?

2007-01-16 12:25:32 · 2 answers · asked by Anonymous

You know the older dude with the crazy white hair ? Is that Einstein ?

2007-01-16 11:55:07 · 4 answers · asked by Anonymous