Physics - December 2006

Because the force of gravity performs work (as in hydroelectric power) does the force require some kind of energy source in order to maintain its existence. If there is not an energy source, doesn't this mean it is a perpetual motion force?

2006-12-14 08:33:25 · 2 answers · asked by Anonymous

I have to build a launcher/catapult/slingshot contraption for physics, and what I've done so far hasn't been working. I can only use 10 rubber bands, 5 paperclips, 10 popsicle sticks, and 2 paper towel tubes. The launcher must be freestanding. I can only use tape and glue to hold it together, and it has to launch a ping pong ball 4.5 meters. I'm pretty sure the best way is to build some type of slingshot, but I can't get the paper towel tubes to stay up, even with tape/glue. Also, I can't figure out any ideas on how to make place for the ping-pong ball to sit if I were to do a slingshot. Does anyone have any ideas on how to make this work?

2006-12-14 08:31:53 · 1 answers · asked by behindme 1

2006-12-14 08:19:19 · 26 answers · asked by dsw 2

2006-12-14 08:11:14 · 4 answers · asked by clinton12300 1

2006-12-14 08:07:36 · 6 answers · asked by janet n 1

i need to know for my midterm

2006-12-14 07:50:52 · 5 answers · asked by Muffin Princess 1

FLUIDS....

True or False? and why?

A sheet of canvas is fixed to a wooden frame. The frame is placed in a subway station so that it is parallel to the passing trains. As a train comes in and decelerates, the canvas bulges away from the train. As the train leaves and accelerates, the canvas bulges towards the train.

2006-12-14 07:48:32 · 3 answers · asked by medman 1

a)40, b)more than 100, c)20, d)30, e)90

2006-12-14 07:46:52 · 1 answers · asked by mikle8582 1

This is not a homework problem so don't worry, more a personal observation...

Why would a go-cart with it's center of gravity closer to the front end accelerate faster than the same cart with the center of gravity near the rear given both are sent down the same hill at the same time? What forces at work would cause this discrepancy?

2006-12-14 07:45:24 · 2 answers · asked by Anonymous

I forgot how to do it

2006-12-14 07:31:42 · 10 answers · asked by Clone C 1

Problem 5.73
A 1.58 m wide, 1.36 m high, 1400 kg car hits a very slick patch of ice while going 19.0 m/s . Air resistance is not negligible.
If friction is neglected, how long will it take until the car's speed drops to 14.0 m/s?
To 9.00 m/s ?

2006-12-14 07:31:03 · 3 answers · asked by physicsmed22 1

hi ppl, i am doing this science project and i am measuring the frequency of a speaker and i am using the oscilloscope, and i have to measure the frequency now, first the sound is generated from a device and then captured by the oscilloscope. can someone please explain to me on how to measure it, i don't know thats why i am asking, thanks in advance. bye.
P>S> the frequency comes nice like curves and it can be slowed down. thanks

2006-12-14 07:14:56 · 4 answers · asked by Anonymous

2006-12-14 07:10:52 · 4 answers · asked by Anonymous

2006-12-14 06:43:05 · 14 answers · asked by Anonymous

sometimes in the sky, u can see some start that twinkle more than other. that is they appear more brighter than other... i was just wondering why it's like this????

2006-12-14 06:41:15 · 7 answers · asked by Anonymous

I have a B.A. in Communications and very few math or science undergraduate classes. I work full time as a design engineer, and need the quickest and most cost effective plan to prepare for graduate school.

2006-12-14 06:41:11 · 5 answers · asked by leighann 1

1) A person wears a hearing aid, which makes a sounds louder by 30 dB.

This means the sound intensity is increased______times
This means the amplitude of the soundwave is increased _____times


2) A hand holding a rope moves up and down to create a transverse wave on the rope. The hand completes an oscillation in 1.9 s, and the wave travels along the string at 0.5 m/s. The amplitude of the wave is 0.05 m.

a.) Find the frequency at which the crests pass a given point in space.

b.) Find the distance between two adjacent crests on the wave.

c.) There is a blue spot drawn onto the rope with a magic marker. Find the distance this spot travels in one period.

2006-12-14 06:30:36 · 3 answers · asked by corinna 2

Every one knows about the third dimension. Is there any one who can tell me about the rest?

2006-12-14 06:23:58 · 11 answers · asked by Anonymous

1. Under what conditions can a first-class lever be used to magnify force? Give an example.

2.Under what conditions can a first-class lever be used to gain speed? Give an example.

3.Rocks used to be used to build the great pyramid of Egypt had to be moved great verticle distances. suggest how torque may have been used to accomplish the feat.

4. Name 5 activities in your life that do not involve torque.

5. Under what conditions is the mechanical advantage is greatest?

6.Should the clockwise torque be equal in magnitude and opposite in direction to the counterclockwise torque? Explain your answer.

7. What factors may have contributed to the differences between the clockwise torque and the counterclockwise torque?

2006-12-14 06:23:27 · 2 answers · asked by looking for knowledge 1

2006-12-14 06:00:14 · 11 answers · asked by Akash T 1

2006-12-14 05:44:47 · 6 answers · asked by Akash T 1

2006-12-14 05:16:02 · 9 answers · asked by The Yeti 3

2006-12-14 05:07:11 · 7 answers · asked by *~*~* Sweet Angel *~*~* 1

My pyrex tube is grounded and the source meter to sweep the voltage is connected with + to probe - to the tube flange. Common ground is the table. I still get double probe characteristic. Am I missing something?

2006-12-14 04:50:29 · 2 answers · asked by Nikki 1

2006-12-14 04:48:36 · 10 answers · asked by Anonymous

2006-12-14 04:08:17 · 16 answers · asked by Anonymous

2006-12-14 03:50:16 · 5 answers · asked by The Question Man 2

A block of mass "m" is moving on a horizontal frictionless surface with a speed of "v sub 0" (initial velocity) as it approaches a block of mass "2m" which is at rest and has an ideal spring attached to one side, (the side where the impact will occur). When the two blocks collide, the spring is completely compressed and the two blocks momentarily move at the same speed, and then separate again, each continuing to move.

A.) Briefly explain why the two blocks have the same speed when the spring is completely compressed.

B) Determine the speed "v sub f" (the final velocity) of the two blocks while the spring is completely compressed.

C) Determine the kinetic energy of the two blocks as they move together with the same speed.

D) Write the equations that could be used to solve for the speed of each block after they have separated. It is not necessary to solve the equations for the two speeds.

2006-12-14 03:45:32 · 3 answers · asked by Robin 3

2006-12-14 03:45:28 · 5 answers · asked by olarewaju k 1

This is for a science experiment i'm doing. I'm more concerned about the "why" instead of the "how". There was unlimited white frosting.

2006-12-14 03:39:56 · 2 answers · asked by Ri Ri 2