Physics - August 2007

2007-08-28 15:43:22 · 8 answers · asked by lol_chunky_monkey 1

Scientists claim they can do it! The tenet of the Special Relativity theory by causing light to defy its own speed limit. There's a lot of technical data. Too much to put here.

2007-08-28 15:40:32 · 2 answers · asked by ZORRO 3

My hypothesis is that if a person closes his window blinds to keep the summer heat out, then turns a light on so he can see, the room will end up hotter than if he had PARTIALLY closed the blinds and let the INDIRECT (not direct) sunlight in. The heat generated from indirect sunlight is miniscule to the point where it would make no appreciable difference in the room temperature if the blinds were completely closed or partially closed. (Think about all that intense heat generated by a full moon. It's the same principle.)

2007-08-28 15:29:07 · 6 answers · asked by The Oracle of Omigod 7

An airplane travels 3100 km at a speed of 790 km/h, and then encounters a tailwind that boosts its speed to 990 km/h for the next 2800 km. What was the avg. speed of the plane for this trip?

2007-08-28 15:13:31 · 3 answers · asked by Anonymous

Basically if there is physics involved can you tell me what kind it is and how physics is associated with the Supernova

2007-08-28 14:59:27 · 4 answers · asked by CHICHI 1

2007-08-28 14:36:02 · 1 answers · asked by VERONICA A B 1

once again I'm working over a problem again and again but the online homework thing keeps rejecting my answer so I turn to you to cheek my numbers.

Two point charges are placed on the x-axis as follows: one positive charge, q1=4.01 nC is located to the right of the origin at .204m. And a second positive charge q2= 4.97 nC and is located to the left of the origin -.302m.

What is the total force (magnitude and direction) exerted by these two charges on a negative point charge q3= -5.99 nC that is placed at the origin?

My answer always comes up at around -2.25 N

2007-08-28 14:32:01 · 1 answers · asked by frozenlint 2

Thousands,millions,billions etc.....

2007-08-28 14:21:17 · 2 answers · asked by Tomcat 5

In class we did this experiment with a ball on an incline. We used a motion detector and it made two graphs on the computer. one positon vs. time and one velocity vs. time. both are of the same ball and motion. it says to find the equations to both graphs. like on the p vs t, its a quadratic equation, and on the velocity one its a linear equation. well the question is

how does the constant in the position vs. time equation relate to the slope of the velocity vs. time equation??

2007-08-28 13:54:41 · 1 answers · asked by ksv 1

Let o=the angle's position:

If a question states North of East angle of o:
Is it drawn as this: /o_
Or this: o/_
And vice versa, is East of North this: o/_

PS: Pretend /_ is an angle, and because o can't be underlined, excuse the cut.

2007-08-28 13:53:06 · 1 answers · asked by TT 1

"A person first walks at a constant speed V1 along a straight line from A to B and then back along the line from B to A at a constant speed v2" What is her average speed over the entire trip?

I thought it was just (V1+V2)/2 but someone told me you can't do that in this case?

2007-08-28 13:48:35 · 2 answers · asked by music123 1

A child walks due east on the deck of a ship at 3 miles per hour.
The ship is moving north at a speed of 12 miles per hour.

Find the speed and direction of the child relative to the surface of the water.

2007-08-28 13:43:56 · 1 answers · asked by wvlilgurl 1

A child walks due east on the deck of a ship at 3 miles per hour.
The ship is moving north at a speed of 12 miles per hour.

Find the speed and direction of the child relative to the surface of the water.

2007-08-28 13:41:38 · 3 answers · asked by wvlilgurl 1

Can somebody help me with these problems? Totally confused.
First it says, "Useful Formula: v = (Triangle)s / (triangle)t
I dont know what the triangle means either.. Then the questions.


1. A car drives down the road 4km in .10 hours. What is its velocity in meters per second?

2. A skater has a velocity of 10.0 m/s. How much time will it take for the skater to go 200.0 m?

3. It takes light a time of 8.3 minutes to travel from the sun to the Earth. If the velocity of light is 3.00 x 10^8 m/s, what is the distance from the Earth to the sun.

4. A pitcher throws a fastball at 160 km/hr. How much time will it take to reach the plate just 18.4m away?

Please provide explanations if you intend to answer! MUCH APPRECIATED!

2007-08-28 13:24:36 · 3 answers · asked by stevendaox 1

for instance, if i drop a ball, would it instantly reach 9.8mps2 (assuming there is no air resistance) or will its speed increase by that each second. could you please site sorces, this is an argument and my mom is a skeptical person

2007-08-28 13:23:42 · 4 answers · asked by timnuoa 2

I'm having difficulty understanding the steps involved in solving a basic physics question I was assigned. The answers for this is in the back of the book, but I want to really understand how it was derived.

1. Use dimensional analysis to find acceleration as a function of velocity (m/s), and radius in an object moving at a constant speed around a circle of radius r. The SI unit of acceleration is m/s^2.

The answer is acceleration = K v^2/r
Where K is a dimensionless constant.

How do I come up with this? Where do I start, and how do I know I have K? Can the value of K be determined somehow?

Thanks!

2007-08-28 13:22:05 · 2 answers · asked by LearnChem 1

speedy sue, driving at 30.0 m/s, enters a one-lane tunnel. she then observes a slow-moving van 155m ahead traveling at 5.00m/s. Sue applies her brakes but can accelerate only at -2.00m/s because the road is wet. Will there be a collision? If yes, determine how far into the tunnel and at what time the collision occurs. If no, determine the distance of closet approach between Sue's car and the van.

2007-08-28 13:19:39 · 1 answers · asked by bob b 2

2007-08-28 13:00:28 · 5 answers · asked by chad 2

I am stuck on this question. I need to determine the expected frequency, f_2, of the second harmonic (n=2) standing wave with the given:

hanging mass = 150 g, linear mass density = 4.1 g/m and the length of the string is L = 1.8 m.

The equation I have been using is f_n = (n*V) / (2*L). Except I don't know V and how do I use the linear mass density (mu) in this case?

2007-08-28 12:39:04 · 3 answers · asked by Anonymous

The question is:
Suppose a car is traveling at 20 m/s and the driver see's a traffic light turn red. After .530 seconds has elapsed (the reaction time) the driver appiles the breaks and the car decelerates at 7.00m/s^2. What is the stopping distance of the car as measured from the point where the driver notices the red light?


Please explain the formula's used to arrive at the answer. Thank you.

2007-08-28 12:32:27 · 2 answers · asked by Jamgirl108 1

i need to find the velocity of a bouncing ball in equation form, and a written answer how would i do that.
best correct answer (like i would know) will recieve extra points.

dont just right dumb stuff to get some points, and dont give me wrong answerers on purpose i will know i do know some about physics. please and thank you

2007-08-28 11:59:56 · 2 answers · asked by Anson D 1

A locomotive is accelerating at 1.6 m/s2. It passes through a 18.0 m wide crossing in a time of 2.4 s. After the locomotive leaves the crossing, how much time is required until its speed reaches 27 m/s?

I tried this many times, different ways. I thought the answer was 12.1875s, but I guess I was wrong. If anyone would help me solve this, Id really appreciate it

2007-08-28 11:37:11 · 1 answers · asked by yoyo d 1

I'm wondering the calculations.

2007-08-28 11:33:23 · 2 answers · asked by Tony B 1

Two point charges lie on the x axis. A charge of +6.2 microC is at the origin, and a charge of -9.5 microC is at x = 10.0 cm. What is the net electric field at (a) x = -4.0 cm and at (b) x = +4.0 cm?

Thanks :)

2007-08-28 11:31:28 · 1 answers · asked by 123haha 1

2007-08-28 11:24:31 · 5 answers · asked by Anonymous

2007-08-28 11:21:32 · 9 answers · asked by Dan 2

2007-08-28 11:12:00 · 2 answers · asked by Anonymous

The length of each monofilament is variable (depending on the force exerted at the 0.028" diameter flat tip. How do I calculate the force exerted if I know the diameter and the length of the line?

2007-08-28 11:09:01 · 1 answers · asked by Griffin 2

The base of the prism is vertical equilateral triangle of side 1 + √3, and its depth is 1.
[The three balls can just tightly fit inside such prism , touching each other and the faces of the prism]

All surfaces are frictionless.
What is magnitude of force applied by the balls to the bottom face of the prism?

--/\
-/O\
/OO\
^^^^^^

2007-08-28 10:25:05 · 2 answers · asked by Alexander 6

Since there is an absolute limit on velocity, it implies quantised distance and time. from this, if point B is directly between point A and C in space, why does on have to go through point B in getting from A to C. What is the role of matter in determining the associations of points of space? And can these associations are viewed as information? Since time cannot be observed without memory does this mean that time does not really exist without applications of energy or matter (which are the recording mechanisim of this universe). Will this also mean that without matter it will be possible to move directly from point A to C without traversing the inbetween.

2007-08-28 09:56:51 · 2 answers · asked by tapiwa m 2