Physics - March 2007

pls explain in detail the step to draw a tranverse wave.

2007-03-27 22:31:27 · 3 answers · asked by sochn9022jkl 1

2007-03-27 22:28:39 · 3 answers · asked by hunny_b 1

What are going to be the common near future goals? What is the ultimate future of Nanoscience aplication? Can we figure out life, time, and space fully now?

2007-03-27 21:47:28 · 3 answers · asked by Watchful 1

I recently studied about that in Angels and demons

2007-03-27 21:41:54 · 7 answers · asked by Aravindh P.G. 1

Hi, I like to know how can I easily produce static charge in my hands when I touch other people? Thanks.

2007-03-27 21:15:04 · 2 answers · asked by ratmforever 2

Heisenberg's principle says that we , humans, can't find the exact speed and location of an electron at a specific moment. Yes, but why God can't? Why can't we think that God could determine the exact electron's attitude inside the electron cloud when he was creating the Universe, and had predetermined everything, so that we don't have free will?

2007-03-27 20:30:38 · 2 answers · asked by johnny206greece 1

Just wanted to know if magnetism can pass through Oil or not . Meaning, if we were to place a magnetic material in a galss of oil and using a magnet on the outer side of the glass, drag the magnetic material out, will it be successful ?

2007-03-27 20:01:07 · 7 answers · asked by Anonymous

We hear all these stories all the time about a glass of water or something sliding across the table. Or a chair falling over on its own. Do you think that magnetism could be an answer for this? Think about how much the moon's magnetic force affects the earth...

opinions?

2007-03-27 19:33:10 · 3 answers · asked by Anonymous

Whenever it rains, my office will blackout just before we hear the thunder.

We haven't got an electrician to check but our air-con service men said that the problem should solve if we switch to a lower sensitive 'something'.

I forgot what's the name, but it concerns the voltage tolerence before the electricity trips.

2007-03-27 19:31:09 · 1 answers · asked by harunouuta 2

question: a concave makeup mirror is designed so the virtual image it produces is twice the size of the object when the distance between the object and the mirror is 14 cm. what is the radius of curvature of the mirror?

approach: i took half of do and got 7 cm. then, i plugged in numbers into 1/f = 1/do + 1/di with variables di = 14 cm, do = 7m. I got f = 4.7. I took half of that to get radius and got R = 2.3 cm.

my main question is...did i half or multiply the right number? is this right?

2007-03-27 19:29:11 · 1 answers · asked by Jimmy 3

I think it has something to do with Bernoulli's principle, but if the pressure of the air is less than wouldn't the water spread out instead of in?

2007-03-27 19:18:55 · 5 answers · asked by M^3 1

If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is 41% the escape speed? km

2007-03-27 18:59:05 · 2 answers · asked by Anonymous

what is the volume of the object

2007-03-27 18:31:15 · 3 answers · asked by hope 1

I have a force which i got from F = G(m1m2)/r^2...then i calculated the theta using arctan. Now how do i compute the seperate x component of acceleration and y component of acceleration?

i know that
acceleration (x) = F(x)/Mass
acceleration (y) = F(y)/Mass

thank you

2007-03-27 17:43:41 · 1 answers · asked by aqmart14 1

And why would any starship store antimatter pods if the ships main drive is run off of dilithium crstyals? I understand the antimatter is stored away from the core unit (for safety reasons) but how are dilithium crystals and antimatter related?

Thanks.

2007-03-27 17:33:06 · 6 answers · asked by Charlie Bravo 6

a) You are driving across a gravel bed, when you see a patch of ice ahead. You slam on the brakes attempting to stop before you hit the ice. The kinetic energy dissipated and the braking maneuver was 3.0 X 10^5J. The maneuver brings your vehicle (assume the vehicle mass is 1.0 X 10^3 kg) to rest at the edge of the ice patch. What was your initial velocity?

b) In attempting to turn your car around, you inadvertently end up stuck on the patch of ice (assume it is a frictionless surface) and have to be pulled off the surface by a tow truck with a cable and winch. The two truck cable is at an angle 40.0 degrees with respect to the horizontal surface. The tension in the cable during the pulling process is 3.50 X 10^3 N. The car has a mass of 1.0 X 10^3 kg. How much work is done by the cable in moving the car a distance of 15 m?

c) The tow truck driver pulls your vehicle onto the flat-bed. What is the change in grav. potential energy of the car after it is raised 1.8 m above.

2007-03-27 17:19:27 · 3 answers · asked by LesJerLayne 2

I think that the velocity of the light is not as that it was some years before and the velocity of light is varying day-by-day. So why could be the theory of relativity ok today?

2007-03-27 17:16:47 · 6 answers · asked by Anonymous

This is grade 11 Geometry and Trigonometry (I know it's an easy question). My question is: How do I find the perimeter in (cm) for this question (best technique)

Question: The length of two sides of a triangle are 9.3cm and 10.5cm are the included angle is 71°. Claculate: the perimeter of the triangle

My steps:
1. draw triangle and make it into 2, right-angled triangles (the right angles are on the 10.5cm horizontal.

2. 71°+90°=161°
180°-161°=19°
The last angle of one of the right-angled triangles which has the 71° angle is 19°.

3. sin 71°=O/9.3
O=9.3(sin 71°)
=8.793322753
=8.8cm (to 1.d.p)

4. cos 71°=A/9.3
A=9.3(cos 71°)
=3.027783836
=3.0cm

5.This is for the 2nd right angled triangle:
tan x°=8.8/7.5
=1.173333333
therefore x°=49.5595008
=50°

5. cos 50°=7.5/H
H=7.5/cos 50°
=11.6679287
=11.7cm

P=11.7+10.5+9.3=31.5cm
or:

a^2+b^2=c^2
8.8^2+7.5^2=133.69
sqr133.69=11.5624
=11.6cm

P=11.6+9.3+10.5=31.4cm

Note: Which method is better? Thanks.

2007-03-27 16:54:46 · 2 answers · asked by Anonymous

1) What is an everyday use of a converging lense?
2) What is an everyday use of a diverging lense?
3) What is an everyday use for combining two or more converging lenses?

Thanks for your time and consideration. I do choose best answers!

2007-03-27 16:41:55 · 2 answers · asked by churning 1

Can you help me out with this physics 040 question? It's really hard to start out!
A college student wants to toss a textbook to his roommate who is leaning out of the window directly above him. He throws the book up with a velocity of 8.0 m/s. The roommate catches the book while it is travelling 3.0 m/s[upward].
a) How long was the book in the air?
b) How far did the book travel in the upward direction?
I'm understanding that acceleration due to gravity = 9.80m/s^2. Please help!

2007-03-27 16:39:40 · 3 answers · asked by sam 3

2007-03-27 16:30:01 · 6 answers · asked by Macarro 2

Instead of holding your palm hand forward, you tip your palm slightly downward, the force on your hand will be both backward and upward. how is the airstream exerting and upward force on your hand?

2007-03-27 16:26:38 · 3 answers · asked by Kakak 1

If you put your hand on the window of a moving car, so that your palm is pointing directly forward, the force on your hand is directly backward. Explain why the two halves of the airstream, passing over and under your hand, don't produce an overall up or down force on your hand?

2007-03-27 16:24:04 · 2 answers · asked by Kakak 1

2007-03-27 16:17:51 · 5 answers · asked by warlock4 1

I drive a car from point A to B with the speed of 80 Km/h and return from B to A with the same speed. You drive the same route but your speed is 60 Km/h for A to B and 100 Km/h for B to A. Who will be in A again earlier? me or you? and why?

2007-03-27 16:14:51 · 9 answers · asked by Mahmood Nekooee 1

why does an airplane have a "flight ceiling," a maximum altitude above which it can't obtain enough to lift to balance the downward force of gravity?

2007-03-27 16:09:09 · 5 answers · asked by Yarka 1

A hurricane or gale force wind can lift the roof off a house, even when the roof has no exposed eaves. how can wind blowing across a roof produce and upward force on it?

2007-03-27 16:06:52 · 6 answers · asked by Yarka 1

An inductor and a resistor are connected in series. When connected to a 60 Hz, 90 V (rms) source, the voltage drop across the resistor is found to be 45 V (rms) and the power delivered to the circuit is 15 W.
(a) Find the resistance.
R = ohm
(b) Find the inductance.
L = H

2007-03-27 16:03:15 · 1 answers · asked by joe p 1

Why would a Frisbee fly on the airless moon?

2007-03-27 16:00:58 · 3 answers · asked by Yarka 1

Bicycle racers sometimes wear teardrop-shaped helmets that taper away behind their heads. Why does having this smooth taper behind them reduce the drag forces they experience relative to those they would experience with more ball-shaped helmets?

2007-03-27 15:57:46 · 2 answers · asked by Yarka 1