Physics - March 2007

What is the name of a prism that when a laser light enters it at any angle it is reflected back parallel to it?

2007-03-10 11:54:08 · 2 answers · asked by russianfool 3

given an object that is denser than water, how will you make it float in water?

2007-03-10 11:42:51 · 11 answers · asked by crystal 1

2 pts for each answer and 10 for the best answer!

2007-03-10 11:41:36 · 5 answers · asked by Yahoo! 5

A 6.0 kg box slides up a 8.0 m long friction incline at a constant speed at an angle of 30 degree by force 50 N parallel to the incline. The coefficient of kinetic friction is 0.1. The work done against friction is??

please help, thanks!

2007-03-10 11:32:26 · 2 answers · asked by Anonymous

What are some interesting optic phenomena?
eg. mirage, rainbows, etc

and
What are some interesting optic instruments?
eg microscope, telescopte, camera etc

2007-03-10 11:07:05 · 3 answers · asked by Anonymous

2007-03-10 11:05:35 · 4 answers · asked by kristia rosanna t 1

Bernoulli's principle explains

a why airplanes fly.
b boats float.
c pistons work.
d ice melts.

NOTE: His princple is as te velocity of a fluid increases, the pressure exerted by the f uid decreases.

2007-03-10 10:56:59 · 6 answers · asked by Thejames A 1

2007-03-10 10:54:47 · 6 answers · asked by Kelsey A 1

Charles's law - the volume of a gas increaes with increasing temperature, provided the pressure does not change.

Boyle's law - If you decrease the volume of a container of gas, the pressure of the gas will increase, provided the temperature does not change.

2007-03-10 10:53:03 · 3 answers · asked by Thejames A 1

We're doing an "advertisement" to inform the public of the electromagnetic spectrum i need ideas!! its to be done on a medium smallish sized poster. HELP!! :S thanks

2007-03-10 10:47:40 · 4 answers · asked by Lindz911 2

in hong kong

2007-03-10 10:44:23 · 12 answers · asked by supdog247 1

2007-03-10 10:41:05 · 3 answers · asked by johnboy11171 2

2007-03-10 10:36:49 · 2 answers · asked by jdu8903 1

2007-03-10 10:35:50 · 3 answers · asked by jdu8903 1

if you are traveling in a spaceship at the speed of light and you turn the headlights on, will you see the lights in front of you?

2007-03-10 10:21:37 · 7 answers · asked by DOT 5

2007-03-10 10:15:19 · 4 answers · asked by Lost. at. Sea. 7

That was worded terribly, but wut i'm tryin to say is....
let's say someone's 90 lbs... in order to keep their feet on the ground, does the earth's gravity pull them down with a force equal to their weight? is there a way to specifically define this amount of force in a way other than the acceleration of an object towards the earth (9.8 m/s2)???

2007-03-10 10:14:52 · 4 answers · asked by smilepalooza12 1

the whimsical book A Wrinkle in Time.

2007-03-10 10:09:14 · 2 answers · asked by Anonymous

suggest the third dimension?

2007-03-10 10:06:08 · 5 answers · asked by Anonymous

much of Euclid’s work. One of its highlights is the proof of the irrationality of pi.

2007-03-10 10:02:32 · 4 answers · asked by Anonymous

2007-03-10 09:57:46 · 1 answers · asked by Anonymous

2007-03-10 09:53:13 · 9 answers · asked by nick w 1

Police lieutenants, examining the scene of an accident involving two cars, measure the skid marks of one of the cars, which nearly came to a stop before colliding, to be 77 m long. The coefficient of kinetic friction between rubber and the pavement is about 0.80. Estimate the initial speed of that car assuming a level road.

2007-03-10 09:40:52 · 4 answers · asked by Jessie L 2

A 2.4 kg purse is dropped from the top of the Leaning Tower of Pisa and falls 55 m before reaching the ground with a speed of 30 m/s. What was the average force of air resistance?

2007-03-10 09:38:01 · 2 answers · asked by Jessie L 2

2007-03-10 09:06:02 · 6 answers · asked by Anonymous

2007-03-10 09:03:05 · 30 answers · asked by Anonymous

To explain the results of a science experiment, I need information on how one model turbine blade design (a pentagon) produces more electricity than others (trapezoid and rectangle). However, I don't quite understand the aerodynamic aspect of it all. Websites I have visited consist of formulas and descriptions of the standard example, an airplane's wings. However, this is not helping me in the least with figuring out how aerodynamics affects wind turbine electricity generation. Could someone please explain the aerodynamics of this type of wind turbine in simplistic terms? Much appreciated!

2007-03-10 08:29:43 · 1 answers · asked by hillystargirl 3

Object A is metallic and electrically neutral. It is charged by induction so that it acquires a charge of -2.5 10-6 C. Object B is identical to object A and is also electrically neutral. It is charged by induction so that it acquires a charge of +2.5 10-6 C. Find the difference in mass between the charged objects.

2007-03-10 08:21:11 · 1 answers · asked by neverconsiderlifeonascale 1

Help or answers with any awesome
Thanks!

1) The opening under a bridge is in the shape of a semi-elliptical arch and has a span of 52 feet. The height of the arch, at a distance of 10 feet from the center, is 13 feet, Find the height of the arch at its center.
2) A comet has an elliptical orbit with the sun at one focus. The eccentricity of the orbit is approximately 0.92. The length of the major axis of the orbit is about 41.25 units. Find the standard form of the equation of the orbit.
3) The focus of a hyperbolic mirror has coordinates (26,). Find the vertex of the mirror if (26,24) is one of the points on the mirror and the other focus has the coordinates (-26,0).
4) You and a friend live 4 miles apart and are talking on the phone. You hear a crack of thunder and 13 seconds later your friend hears the crack. Find an equation that gives the possible places where the lightning could have occurred.(hyperbola). (Use miles as the unit of distance. The speed of sound is about 1100 ft/sec.)

2007-03-10 08:20:39 · 1 answers · asked by Heydog 1

A. It is 100%.
B. It depends on the difference between the exhaust and intake temperatures.
C. It depends on the ratio between the exhaust and intake temperatures.
D. It depends on the intake temperature.

2007-03-10 08:05:50 · 3 answers · asked by Anonymous