Physics - October 2007

2007-10-03 08:33:36 · 3 answers · asked by Hello 1

On a graph showing how particle displacement varies with distance for a sound wave, how would you find the wavelength?

2007-10-03 07:57:06 · 2 answers · asked by Alexander M 1

Say if I were on 6th floor balcony and jumped and caught myself on the railing of the 3rd floor balcony?

2007-10-03 07:55:32 · 3 answers · asked by jazzfanmd 5

This is the question I have:
A ball is thrown at an angle of 45* to the ground. If the ball lands 90m away, what was the initial speed of the ball?

If someone could explain how to do this I would apreciate it. You don't have to give me the answer, just how to solve it. Thanks

2007-10-03 07:27:34 · 2 answers · asked by me06 2

My guess is that the answer is "the fabric of space-time", but how can there be "fabric" of anything if there is empty space.

2007-10-03 05:18:44 · 2 answers · asked by Anonymous

Jane, whose mass is 45.0 kg, needs to swing across a river filled with man-eating crocodiles in order to rescue Tarzan, whose mass is 80.0 kg. However, she must swing into a constant horizontal wind force F on a vine that is initially at an angle of with the vertical. (See Fig. P5.73.) In the figure, D = 50.0 m, F = 118 N, L = 40 m, and theta = 50.0°.
http://www.webassign.net/sercp/p5-73.gif
(a) With what minimum speed must Jane begin her swing in order to just make it to the other side? (Hint: First determine the potential energy that can be associated with the wind force. Because the wind force is constant, use an analogy with the constant gravitational force.)
m/s
(b) Once the rescue is complete, Tarzan and Jane must swing back across the river. With what minimum speed must they begin their swing?
m/s
Any help would probably be appreciated... ^^

2007-10-03 05:07:22 · 1 answers · asked by Bill 1

My ap physics class is crazy hard so please help me with this problem!

In a physics lab, a 5.0 kg cart is accelerated across a table by means of a .50 kg hanging mass which is allowed to fall and drag the cart by means of a string and pulley. If the cart moves 1.2 m from rest in 2.0 s, what is the force of friction between the cart and table? what is the tension on the string while the cart is accelerating?

2007-10-03 04:58:22 · 2 answers · asked by adelyn 2

2007-10-03 04:37:26 · 12 answers · asked by WAYNE B 1

2007-10-03 03:38:01 · 11 answers · asked by Kim Harold A 1

more than less than forgot which is which < >

2007-10-03 03:34:27 · 8 answers · asked by Anonymous

I CAN'T UNDERSTAND IF STEPHEN HAWKINGS PEA INSTANTON THEORY OR ALAN GUTHS QUANTUM FLUCTUATION ORIGIN ARE NOT PROVEN THEN IN EUROPE WHY DO MANY PEOPLE THINK SCIENCE EXPLAINS BETTER THAN RELIGION

2007-10-03 03:32:05 · 5 answers · asked by BODIN 1

forces cancel

2007-10-03 03:15:33 · 2 answers · asked by Henz Mista 1

WHY??????????

2007-10-03 02:56:01 · 6 answers · asked by mikerob21 2

The latent heat of fusion (solid become liquid) for ice is 79.8 cal/gram. How much ice can we melt with 1000 calories of heat?

2007-10-03 02:24:26 · 1 answers · asked by ? 1

(a) the momentum is conserved, (b) there is zero net force acting on it, (c) equal distances are travelled in equal times, (d) only ther gravitational force is considered.

2007-10-03 02:24:23 · 2 answers · asked by akapo t 1

If something that travels at the speed of light has infinite mass, then why not light and the rest of the electromagnetic spectrum ?

2007-10-03 02:14:54 · 5 answers · asked by John S2005 3

a jumbo starting from rest needs to atain a speed of 350km/h on the runway to take off. can ths plane use a runway 1km long if it is to accelerate at the rate of 2.67m/s2?

2007-10-03 02:12:03 · 2 answers · asked by cara 2

2. A swimmer slides freely from rest from the top of a water slide and reaches the bottom with a horizontal speed. He hits the water 4.6m from the slide 0.8 s later. Find the length of the slide.

4. A spring of force constant 1250 N/m is compressed 0.25m. A brick of mass 1.50 kg is palced on top of it. When the spring is released, how high will the brick go?

2007-10-03 02:11:05 · 1 answers · asked by Anonymous

I am having some difficulty proving the following equation of vertical motion of a rocket.

y=(Vexhaust * t) - (1/2g * t^2) - (m * Vexhaust * ln(m0 / m)) / k

Givin information:

F=trust-Fgravity

m(dV/dt)=Vexhaust(dM/dt)-mg

dM/dt changes at constant rate

dM/dt=-k

Therefore:

m=m0-kt

Thanks for the help. I've been working on this for 2 days.

2007-10-03 01:28:59 · 1 answers · asked by c1b3rnut 1

In the house, if more and more appliances will be connected in parallel, what do you think will happen? Explain. Do you think this would be a good practice? why??

2007-10-03 01:19:46 · 2 answers · asked by Anonymous

2007-10-03 00:57:30 · 3 answers · asked by Chintu Philips Koshy 1

2007-10-03 00:38:13 · 5 answers · asked by Anonymous

I must come up with an equation the determine the distance a spring must be pulled back on a ruler, for it to launch off an hit a specific target. The ruler can be at any angle, the top of the spring is hooked onto the top of the ruler and when you pull back an let go the spring is supposed to fly off and hit the target.

I know Hookes law must be used F=kx, as well as F=ma, and then likely one of the acceleation equations, but I dont know how to put them all together.

Thanks in advance.

2007-10-03 00:31:23 · 1 answers · asked by Cossack 1

What happens if you are standing under a tree and the tree gets struck with lightning?

2007-10-02 23:36:48 · 2 answers · asked by g g 2

Light travels at approximately 3.0 x 10^8 m/sec.

How far does light travel in one week?

2007-10-02 23:19:44 · 6 answers · asked by journey 1

2007-10-02 21:50:23 · 6 answers · asked by Anonymous

please give me reason with atomic funtion theory.
i knew that , temperature vibrate the resistive element in resistor so it increase resist, however other elements also vibrated due to temperature.
why other element not reduce resistance?

2007-10-02 21:41:12 · 3 answers · asked by din e 1

2007-10-02 21:10:47 · 4 answers · asked by bir.salem 2

the water in the plumbing in a house is at a gauge pressure of 300,000 Pa. what force does this cause on the top of the tank inside a water heater if the area of the top is 0.2m2?

2007-10-02 20:58:49 · 3 answers · asked by corvetteracing 1

what is net force?

what is equilibrium??
n how are they related to eachother?
i have no clue please help mee

2007-10-02 20:56:19 · 4 answers · asked by Anonymous