Physics - October 2006

But is so happens that a body would scarcely weigh three times as much on the surface of Jupiter as it would on the surface of the Earth. Can you think of an explanation for why it’s so?

2006-10-12 11:24:45 · 3 answers · asked by notthatbright 1

Which charger to go with for powering an electromagnet of 208-230V and 50/60Hz ? What about 5 in a series? Does it matter?

2006-10-12 11:15:03 · 3 answers · asked by burnholywater 2

A bullet of mass 4.5 g is fired horizontally into a 2.4 kg wooden block at rest on a horizontal surface. The bullet stops in the block. The speed of the block immediately after the bullet stops relative to it is 2.7 m/s. At what speed is the bullet fired?

2006-10-12 11:12:02 · 1 answers · asked by Anonymous

the egg is raw, and the egg with materials has to fit in a quart-sized bag.

2006-10-12 11:11:45 · 11 answers · asked by Anonymous

208-230V 50/60Hz That's all I know about these magnets.

2006-10-12 11:10:39 · 2 answers · asked by burnholywater 2

2006-10-12 11:06:32 · 4 answers · asked by lilv 1

A bead is released from a height of 25.2 m, travels down (25.2 m) & slides without friction around a loop-the-loop, which has a radius of 9 m. What is the speed at the highest point on the loop the loop (in m/s)? Acceleration of gravity is m/s^2.

Isn't the mass of the bead needed to solve? If not, how?

2006-10-12 11:02:14 · 2 answers · asked by Anonymous

I have 5 electromagnets. If I connect them in series, will they all have different magnetic force?

2006-10-12 10:59:32 · 5 answers · asked by burnholywater 2

2006-10-12 10:38:00 · 6 answers · asked by ROswA 1

Since square root functions have both a positive and negative answer, can negative mass exist? I refer to the relativistic mass/velocity equation that I cannot duplicate with this format. Physicists will know it. If negative mass DOES exist, does that imply negative momentum, force and energy in the Newtonian world

2006-10-12 10:11:40 · 15 answers · asked by Anonymous

2006-10-12 09:45:25 · 8 answers · asked by water yu 3

A submarine of mass 2.2X10^6 kg and initially at rest fires a torpedo of mass 260 kg. The torpedo has an initial speed of 100.6 m/s. What is the initial recoil speed of the submarine? Neglect the drag force of the water.

2006-10-12 09:41:49 · 4 answers · asked by nt 2

A 2.0 kg ball swings in a vertical circle on the end of an 80-cm-long string. The tension in the string is 20 N when its angle from the highest point on the circle is theta =30 degrees?What is the ball's speed when theta =30 degrees? What is the ball's magnitude of acceleration at theta =30 degrees?

2006-10-12 09:26:36 · 3 answers · asked by Bryan C 2

Find the acceleration reached by each of the two objects attached by pulleys. One, 7.00 kg, is on an inclined plane of 37 degrees and the other, 12 kg, is hanging freely off the side. The coefficient of kinetic friction between the 7.00 kg object and the plane is 0.300.

I have tried this two different ways.
First:
m2gsinΘ -ukm2gcosΘ - T = m2a
T - m1g = m1a
I found T, and set the two equations equal to eachother and found
a = (m2gsinΘ - ukm2gcosΘ - m1g) / (m1 + m2).
After plugging everything in I found a = -4.882 m/s2 but this is the wrong answer.

Second try:
For 12kg object
m1g - T = m1a
(12)(9.8) - T = 12a
T = 117.6 -12a
For 7kg object
the frictional force
f = μ N = μ mg cos 37 =16.4359 N
T = f + m2g + m2a
T = 16.436 + (7)(9.8) + 7a = 117.6 - 12a
19a = 117.6 -85.036
a = 1.714
This answer is still wrong. Where did I go wrong?

2006-10-12 08:59:36 · 1 answers · asked by terpjenrose 1

A 1600 kg car starts from rest and drives around a flat 40.0 m-diameter circular track. The forward force provided by the car's drive wheels is a constant 1000 N.What are the magnitude of the car's acceleration at t= 10.0 s?If the car has rubber tires and the track is concrete, at what time does the car begin to slide out of the circle?( assume the coefficient of static friction to be 0.8)

2006-10-12 08:55:33 · 1 answers · asked by Bryan C 2

While running, a person dissipates about 0.60 J of mechanical energy per step per kilogram of body mass. If a 52 kg person develops a power of 64 W during a race, how fast is the person running? (Assume a running step is 1.5 m long.)

2006-10-12 08:33:07 · 5 answers · asked by activegirl 1

A 0.05kg arrow is launched vertically into the air. The bowstring exerts an average force of 53N on the arrow over a distance of 0.75m.
a) with what speed does the arrow leave the bow
b) how high will the arrow travel. neglect air resistance

thanks!

2006-10-12 08:20:57 · 3 answers · asked by vanilea 2

2006-10-12 08:16:53 · 18 answers · asked by Dana B 1

2006-10-12 08:16:25 · 13 answers · asked by Anonymous

2006-10-12 08:08:25 · 2 answers · asked by kelleygaither2000 1

I have a hard question which I just cant do can anyone help me?

Triangle of froces.
figures: 1) 5N at 15degrees to above west of the horizontal.
2) 7N at 20degrees to the above west of the horizontal
3) unknown force??

question A) To show that coplanar forces acting on an object in equilibrium graphically by a triangle of forces.
B) To solve analytically the same force system as in (A) above.


Please may someone teach me this if you have any visual representations then send them to mini_elliso@hotmail.co.uk

Thans everyone

2006-10-12 07:30:03 · 5 answers · asked by louie_ellis 1

For example, does one year feel longer for one person than it does for another? Is this linked to any kind of chemical in the brain or body?

Also...when we have a good time somewhere, things seem to go by more quickly than they do when we're not enjoying ourselves. Is any of this linked to a chemical or mechanism that changes our perception of time?

Have any studies ever been done on this or is there any kind of scientific or medical explanation?

2006-10-12 07:17:11 · 4 answers · asked by The Answer 2

Imagine you have a bird, flying directly north. The sun is shining directly east (from the west). There is a wall to the east of the bird which runs at an angle so that as the bird flies forward it's perpendicular distance from the wall increases (e.g. running south-west to north east). So, as the bird flies north, it's shadow moves up the wall, going north at exactly the same speed. But because the wall is at an angle, the shadow is actually moving a greater distance than the bird in a set amount of time. So, the shadow is moving faster than the bird by a certain ratio.
Now imagine that (somehow) this bird could travel at nine tenths the speed of light (this is theoretically not impossible according to our current knowledge of physics,). The shadow would therefore be travelling faster than the speed of light.

I know that the explanation for this is that a shadow is not a 'thing', but using this method to send a signal, information could be transferred faster than the speed of light.

2006-10-12 07:06:04 · 13 answers · asked by THJE 3

I didn't say the earth, I said the universe. Like creating a black hole or causing magnetic monopoles thus providing an impetus for proton decay?

2006-10-12 06:56:31 · 7 answers · asked by Anonymous

if you divide 1 and 0.999 reccuring then you get 0.333 recurring for both

2006-10-12 06:28:49 · 33 answers · asked by supremecritic 4

2006-10-12 06:22:00 · 17 answers · asked by supremecritic 4

2006-10-12 06:10:36 · 21 answers · asked by LUIS M 2

2006-10-12 06:07:49 · 5 answers · asked by Jayendra T 1

I am a great fan of Terry Pratchett's discworld books, his details are usually fantastic or accurate (or both). But in "The Fifth Elephant" Detritus' giant crossbow has serious recoil - has Terry made a mistake ?

2006-10-12 06:00:19 · 18 answers · asked by Aspphire 3

2006-10-12 05:48:36 · 15 answers · asked by LUIS M 2