Physics - November 2007

A pendulum consists of a 1.6 kg stone swinging on a 3.0 m string of negligible mass. The stone has a speed of 8.2 m/s when it passes its lowest point. (a) What is the speed when the string is at 59° to the vertical? (b) What is the greatest angle with the vertical that the string will reach during the stone's motion? (c) If the potential energy of the pendulum-Earth system is taken to be zero at the stone's lowest point, what is the total mechanical energy of the system?

2007-11-17 03:24:23 · 1 answers · asked by shade o 1

true or false

2007-11-17 03:02:39 · 3 answers · asked by Baby Gurl 1

Include What, When, Where, how, and, Why

2007-11-17 01:43:12 · 9 answers · asked by Rishita Y 1

true or false

2007-11-17 01:04:13 · 7 answers · asked by DeeDee 1

2007-11-16 18:59:50 · 4 answers · asked by poohchii_pooh_xx7 1

A wire that is .002 m in diameter and 1.6 m long stretches .0005 m when a 30 kg weight is hung on its end. Find the Young's modulus of the wire.

2007-11-16 18:09:15 · 3 answers · asked by n_is_for_ninja 1

2007-11-16 17:41:02 · 3 answers · asked by Anonymous

2007-11-16 17:31:48 · 14 answers · asked by jes200732 1

I'm having trouble with this problem. I'm not sure what to do but I beilieve i would need to use momentum conservation.

when can assume when the springs velocity is 0 when the spring has reach it's max length .

the problem can be sloved by using the equation
m1v2 = m2v2

????

______________________________________

In a one dimensional air track two springs are collide head on in a elsatic collision. Spring 1 has mass of .081 kg and a velocity before contact with spring 2 of 5.3 m/s. Spring 2 has a mass of .053 kg and a velocity before contact with spring 1 of -3.6m/s. (the right side = +)

[1] what is the velocity of spring 1 and spring 2 when the two springs are at maximum compression?

[2] what is the velocity of spring 1 and spring 2 at the instant they touch each other?

2007-11-16 16:50:32 · 3 answers · asked by JLK 1

And the sliding carton skids onto a rough surface and stops in 3s. Calculate the force of friction is encounters.

2007-11-16 15:57:06 · 2 answers · asked by Anonymous

I would really appreciate help on this problem it's giving me alot of trouble. Thanks. A bullet of mass 6 g strikes a ballistic pendulum of mass 2.0 kg. The center of mass of the pendulum rises a vertical distance of 10 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.

2007-11-16 15:50:43 · 3 answers · asked by Anonymous

Explain how to find the coefficient of kinetic friction between a wooden block of unknown mass and a tabletop in the laboratory. Include the following in your explanation:
*Measurements required
*Equipment needed
*Procedure
*Equation(s) needed to calculate the coefficient of friction.

2007-11-16 14:51:05 · 1 answers · asked by Anonymous

ok, in my town a boy was killed by a train, people say there were 2 passing trains and he got sucked in between the trains when they passed each other where he was. i dont believe this, and i want to know if this is possible to happen, by the way, the kid was on drugs.

2007-11-16 14:10:47 · 4 answers · asked by kid 2

How do I find speed in M/PH when I have the distance in miles and seconds from point A to point B?

2007-11-16 14:09:34 · 3 answers · asked by Anonymous

I know this is an odd question, but I HAVE TO KNOW!

2007-11-16 14:01:37 · 2 answers · asked by Anonymous

Providing an air conditioner is powerful enough to cool a room well and is rated at, say 3 litres an hour of water extraction, how would the relative humidity of the room be affected? If the relative humidity, was %80 before the AC was turned on, what, roughly, would the relative humidity be a few hours after use? I know many factors are involved, not least being the make and model of the AC but I am looking for a very vague idea. Could a reduction of %40 humidity be achieved, or is %5 more likely?

2007-11-16 13:58:55 · 5 answers · asked by Peter 2

ok i need as many facts about platinum as i can before monday.
i am trying to look it all up but its all telling me the same thing and there is nothing interesting at all. i know its more than just a metal, could someone please tell me some other stuff about the element platinum? please?

2007-11-16 13:50:25 · 3 answers · asked by Gabriella R 1

so a 0.25w and 2w resistor what is their own purpose?

2007-11-16 13:26:17 · 5 answers · asked by Anonymous

2007-11-16 13:24:03 · 5 answers · asked by Anonymous

So if I find a way to somehow travel faster than light I can supposedly go back in time, right? But If I were to go back in time, I would either travel backwards to the point where I went to the speed of light, then go faster than light, then go back in time to the point where I went faster than light and I would be stuck in an endless cycle of speeding up and going back in time to speed up again? Or would I travel to the point of the speed of light, (And according to science, time stops when you reach the speed of light) and time would pause, and I would be stuck there for all eternity? And If I was stuck like that, and someone were to pass by the area where I achieved light speed, what would they see? Would they see me continuing at the speed of light, or would I simply vanish?

2007-11-16 13:14:09 · 3 answers · asked by Anonymous

Can someone explain to me how to answer this problem. I am a little stuck...

Light is shining perpendicularly on the surface of the earth with an intensity of 900 W/m2. Assuming all the photons in the light have the same wavelength (in vacuum) of 637 nm, determine the number of photons per second per square meter that reach the earth.

Thanks!

2007-11-16 13:10:02 · 1 answers · asked by Anonymous

In the last few seconds of a hockey game, a player aims a slap shot at the opponent's empty net from a distance of 32.5m.

The coefficient of kinetic friction of rubber on ice is 0.005.

Use 9.80 N/kg for |g| and a puck of mass 0.170 kg to keep accuracy of three significant digits.

Show that the pucks speed hardly changes when friction is low.

2007-11-16 12:52:41 · 2 answers · asked by To-the-Stars 4

2007-11-16 12:47:50 · 4 answers · asked by John L 5

2007-11-16 11:48:12 · 3 answers · asked by Anonymous

If you want to double the force of friction between an object and a table you could

a) double the speed of the object
b) double the acceleration of the object
c) double the normal force acting on the object

2007-11-16 11:47:53 · 1 answers · asked by nbastar51 1

2007-11-16 11:46:51 · 4 answers · asked by Anonymous

2007-11-16 11:44:43 · 2 answers · asked by Anonymous

Hey can people help me construct sentences for physics vocab! I'm sorry for asking you about this but it really is hard when whatever you do to understand it doesn't help! please help! here are the words:
Mechanical wave
transverse wave
longitudinal wave
rarefaction
surface wave
amplitude
hertz
angle of incidence
angle of reflection
refraction
diffraction
interference
constructive interference
destructive interference
standing wave
node antinode
resonance
seismic wave
primary wave
secondary wave

2007-11-16 11:34:55 · 3 answers · asked by npat 1

could i use it without damaging the battery. Thanks to others on this site i have worked out that it should run for 65 minutes, but i have been told that lead acid batteries should not be completely discharged or they will fail quickly. With this in mind, how many minutes could i run this battery/ lamp combination before i am getting close to damaging the battery? I want to be able to use it and recharge it once a week for 2 years or so. Thanks for your help.

2007-11-16 11:04:25 · 7 answers · asked by Anonymous

Q:using a plumb line and a string measure the vertical distance h, the ball (steel ball) must drop from the bottom end of the ramp in order to land in an empty soup can on the floor.

1)what may cause a ball to miss the target?
2)you probably noticed that the range of the ball increases in direct proportion to the speed at which it left the ramp. the speed depends on the release point of the ball on the ramp. what roles do you think air resistance had in this experiment?

3)should the height of the can be taken into account when measuring the vertical distances h?

2007-11-16 10:25:45 · 3 answers · asked by peipei91189 1