Physics - February 2007

Space travelers from Earth have determined that on the Klingon planet 9-KMHF and object thrown upwards at the intial speed of 60 m/s returns to the surface after 3 sec. What is the gravitational acceleration on 9-kmhf??

please help thanks!1

2007-02-14 10:01:09 · 1 answers · asked by Anonymous

A rock is thrown straight up with an intial velocity of 19.6 m/s. What time interval elapses between the rock's being thrown and its return to the original launch point?

please help! thanks!!

2007-02-14 09:58:56 · 2 answers · asked by Anonymous

Don't you get more satisfaction when you learn something new, and figure out the problem for yourself? It may be easier to cheat, but you'll find that the things in life that are difficult and take time, (such as learning math or understanding the world around you) are often worthwhile in the long run. Why do so many people actually answer obvious homework questions and do the work for these cheaters? They should just give hints or something.

2007-02-14 09:58:47 · 3 answers · asked by Link 5

Im doing physics homework and we are learning about light rays and angles off of surfaces...so basically is refraction the same as reflection? is the angle of refraction the same thing as the angle of reflection??

2007-02-14 09:58:23 · 4 answers · asked by more than words 1

Let’s say you where in a bank the robbers say five must die unless on volunteers would you do it

2007-02-14 09:51:19 · 8 answers · asked by hotrod in 7-11 1

A basketball player who is 2.00m tall is standing on the floor 10.0m from the basket. if he shoots the ball at a 40 degree angle with the horizontal, at what initial speed must he throw the ball so that it goes through the hoop without striking the backboard? the basket height is 3.05m.

2007-02-14 09:42:40 · 2 answers · asked by Anonymous

2007-02-14 09:39:23 · 2 answers · asked by quik l 1

Two submarines are underwater and approaching each other head-on. Sub A has a speed of 16 m/s and sub B has a speed of 10 m/s. Sub A sends out a 1410 Hz sonar wave that travels at a speed of 1522 m/s. (a) What is the frequency of the sound detected by sub B?(b) Part of the sonar wave is reflected from B and returns to A. What frequency does A detect for this reflected wave?

2007-02-14 09:09:25 · 1 answers · asked by CHI U 3

At a height of 20 meters above the surface of a lake, a sound pulse is generated. The echo from the bottom of the lake returns to the point of origin 0.130 s later. The air and water temperatures are 20°C. How deep is the lake?

2007-02-14 09:07:33 · 2 answers · asked by CHI U 3

A string of length 2.7 m is fixed at both ends. When the string vibrates at a frequency of 85.0 Hz, a standing wave with 6 loops is formed. What is the wavelength of the waves that travel on the string?

2007-02-14 09:06:06 · 1 answers · asked by CHI U 3

If there is a constant G force on the moon, then it falls about 5m/s for the FIRST second, which it overcomes with it's tangential motion. But in the second second (heh) it should fall TWENTY m, thereby losing 15m from it's motion. The next second should be even more, and so on.

2007-02-14 09:01:54 · 6 answers · asked by thyplo101 2

the two types...I know one is rolling the other is??? and what is it?

2007-02-14 08:54:11 · 3 answers · asked by Anonymous

does the Universe stop and another begin? Is the universe ever growing and expanding? Either way it makes no sense. Does an infinate universe make sense?

2007-02-14 08:41:56 · 6 answers · asked by Paul S 3

One negative charge -Q is held in fixed position (x,y,z) = (1/4,1/4,1/4),
another charge is positive +2Q at (x,y,z) = (1,1,1).

What is the probablity that electron randomly placed
inside the cube 0

2007-02-14 08:32:58 · 6 answers · asked by Alexander 6

A helicopter is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 58600 N. The lift force L generated by the rotating blade makes an angle of 21.0° with respect to the vertical.

(a) What is the magnitude of the lift force?
(b) Determine the magnitude of the air resistance R that opposes the motion.

Can anyone help lead me in the right direction?

2007-02-14 08:16:11 · 5 answers · asked by Anonymous

a physics questions not chemistry...

2007-02-14 08:05:42 · 2 answers · asked by Pr1Nc3$$ 2

An old legend tells the story of a stingy man who never let go of his bag of coins. One winter's day, he slipped in the snow and suddenly found himself in the middle of a frozen pond. The ice on the pond was so smooth and slippery that he could not grab on to the ice to stand up. In fact, he could not get enough traction to move on it at all. What could he do to save himself.

All I know about the answer is it has to use a physics concept.

2007-02-14 07:58:24 · 7 answers · asked by I<3Twilight 2

2007-02-14 07:49:41 · 2 answers · asked by kcc 1

2007-02-14 07:42:27 · 1 answers · asked by kcc 1

Great Atom Universe, is divided in three energies: electrons, prótons and nêutrons. To electrons the negative power, but with positive return. To prótons, the positive power, but with negative return. With regard to nêutrons, the responsibility sobrou to act of form to unbalance the positive and negative energies, in its related limits. Thus it neutralizes the beginning and end. Energies that come of the place for where go, and go for the place of where they come.

2007-02-14 07:05:15 · 1 answers · asked by britotarcisio 6

Can anybody identify as many (5 or more) simple machine that are in a bicycle.
I already have the wheels down for wheel and axle. I just need one for each simple machines: wedge, screw, incline plane, pulley, and the 3 levers.

2007-02-14 07:01:27 · 3 answers · asked by ? 4

2007-02-14 06:57:16 · 7 answers · asked by Anonymous

I shall be grateful if someone can direct me to a site which gives facts and figures about typical cell-site antenna radiation patterns, measured RF radiation levels within a building, safe radiation levels, etc.

2007-02-14 06:49:36 · 6 answers · asked by wisdom tooth 3

I know that an electromagnetic pulse from a nuclear blast would destroy electric wires and circuits within range. I presume this could destroy the electrical power system we all use: power plants, wiring, outlets, etc. I tried to think if there was any power generation system that didn't rely on vulnerable electric components, but the only thing I could think of was natural gas--but that wouldn't power a radio or TV. What could replace electricity?

2007-02-14 06:19:29 · 6 answers · asked by PopeKing 2

2007-02-14 04:39:08 · 3 answers · asked by JAMES 1

A copper wire has a resistance = 0.501 ohms at 20 degrees C and has a temp coefficient of resistivity = 3.9e-3. A iron wire has resistance = 0.487 ohms at the same temp with a temp coefficient of resistivity = 5.0e-3. At what temperature do these two wires have the same resistance???? I have been using the equation R=R_ [ 1 + temp coefficient of resistivity ( T - T_)] in trying to find the temp but cannot come up with the right answer...

2007-02-14 04:28:32 · 2 answers · asked by Anonymous

Explain

2007-02-14 04:14:51 · 9 answers · asked by Anonymous

What is the function of a fuse or circuit breaker?

What is the function of a ground wire?

Explain

2007-02-14 04:13:31 · 10 answers · asked by Anonymous

Explain how lightning is more likely to strike a tree first, as appose to flat earth.

2007-02-14 04:11:21 · 6 answers · asked by Anonymous

2007-02-14 03:48:29 · 1 answers · asked by jaime jg 1