Physics - October 2006

2006-10-18 19:34:43 · 2 answers · asked by Anonymous

2006-10-18 19:26:41 · 3 answers · asked by Kevin G 1

I mean the future, and/or the past life? If time is like a circle, can you get off possibly in the future, as well as the past? If from the past, then they would have mastered the speed of light, but could we have lived other live's as well?
This is a mix of spirituality and science question.

2006-10-18 19:16:38 · 3 answers · asked by shardf 5

I asked a while ago about this, but I there was still some confusion in my mind. My ultimate goal is to use power electric heating coil from human powered bike. I was wondering, I will I be able to create enough power to power the coil?

Here's what I have so far: I took the motor out from an old fan, and I was thinking about directly connecting that to the bike. My question is would that work? If so, about how much power will I be able to get out of it? Am I going to need anything like an inverter? or can I just connect to the two end terminals to the coil, and that would work? Also, am I going to need a diode? Basically, what I am trying to ask is how would I put everything together? I have bits of info, just need to figure everything out.

Also, as for the coil, how does the wattage rating work? I am thinking of using maybe like a teapot coil..

Thanks in advance!!

2006-10-18 18:56:18 · 4 answers · asked by Sowatup 1

Let's say a simple circuit consisting of dry cells connected in series and light bulbs is created.

If one dry cell runs out of power, is the circuit broken or does the dry cell then function as an electrical conductor, keeping the circuit unbroken? That is to say, assuming the other dry cells supply enough power, will the light bulbs stay lit?

2006-10-18 18:45:11 · 8 answers · asked by Anonymous

A freight train has a mass of 3E7 kg.
If the locomotive can exert a constant pull of 7.6E5 N, how long would it take to increase the speed of the train from rest to 289800 km/s? Answer must be in units of s.

2006-10-18 18:32:52 · 3 answers · asked by wish1oh1 1

A 4.12 kg ball is dropped from the roof of a 170.9 m tall building. While the ball is falling to Earth, a horizontal wind exerts a constant force of 13.3 N on the ball.

The acceleration of gravity is 9.81 m/s^2
A) How long does it take to hit the ground (seconds)?
B) What is its speed when it hits the ground? (m/s)

2006-10-18 18:04:57 · 2 answers · asked by wish1oh1 1

show steps
an 8 kg stone rests on a spring. the spring is compressed 10 cm by the stone. what is the spring constnat?

the stone is pushed down an additional 30 cm and released. what is the elastic potential energy of the compressed spring just before that release?

2006-10-18 17:00:00 · 2 answers · asked by Isabelle 2

Knowing the time of flight, the initial velocity in the x direction, and the final velocity in the y direction, how do i find the impact velocity ?(whatever that is)

2006-10-18 16:30:14 · 4 answers · asked by bep 2

an object is at rest on a frictionless incline supported by a string parell to the incline. What is the magnitude of the tension in that string in terms of mass of the object and the incline angle theta. What forces would be found on the mass. I know that there are no numbers. Problem is supposed to make you think

No numbers

2006-10-18 16:21:16 · 2 answers · asked by Anonymous

v_y = v_y_0 + a*t

y= y_0 + v_y_0 * t +1/2*a*t^2

v_y^2 = v_y_0^2 + 2*a*(y-y_0)

I know that v_y_0 = 0 and y_0 = 0 (a ball is rolling off a ramp and I need to figure out the final velocity in the y direction) I know the values of y, a (9.8), and time. Each equation I use, however, produces different results. What am I doing wrong here?

2006-10-18 15:57:18 · 3 answers · asked by bep 2

The half life of 52 Mn is 5.6 days.
25
How many half lives are past after 50.4 days?
How much of a 100g sample would be left after that time?

2006-10-18 15:54:16 · 9 answers · asked by xxgodsgift2youxx 1

a swimmer is capable of swimming 0.45m/s in still water.
(a) if she aims her body directly across a 75 m wide river whose current is 0.40m/s, how far down stream will she land? (from a point opposite her starting point).
(b) how far will it take her to reach the other side?

2006-10-18 15:54:11 · 2 answers · asked by 3ajeeba_q8 2

Compare and contrast n-type semiconductors with p-type semiconductors.
A.
B.
C.

2006-10-18 15:46:30 · 3 answers · asked by xxgodsgift2youxx 1

You are to walk across a high wire strung horizontally between two buildings 10.0m apart. The sag in the high wire when you are at the mid-point should not exceed 10°. If your mass is 50.0 kg what must be the tension in the rope?

2006-10-18 15:36:48 · 1 answers · asked by 3ajeeba_q8 2

An ac circuit is rated 240 v.What is the maximum voltage?For an appliance in an ac circuit of maximum current of 2 amps,what is the effective current?

2006-10-18 15:35:02 · 5 answers · asked by xxgodsgift2youxx 1

2006-10-18 15:31:13 · 4 answers · asked by Aaron A 5

I know that it is the tuning effect of force and I know how to calculate it but I need more info. Any takers?

2006-10-18 15:30:07 · 1 answers · asked by Jamaican Dime 1

I know it seems like a pointless question, and I guess I should first research how memory is actually stored... but I thought I would ask anyways.

2006-10-18 15:28:27 · 6 answers · asked by Amir 1

When a liquid is spung within a cylindrical vessel,the level of the liquid does not remain horizontal, but it rises up along sides of the walls of the cylinder. For spinning we give only a horizontal angular force to the liquid. But how can the liquid rise up like that without any vertical force applied or generated?.

2006-10-18 14:32:36 · 1 answers · asked by sam_samarasinghe52 2

1. What average force is need to accelerate a 7.0g pellet from rest to 500m/s over a distance of 0.700 m along the barrel of a rifle?

2. A window washer pulls herself upward using the bucket-pulley appartus (shown in a pic). (a) How hard mush she pull downward to raise herself slowly at a constant speed? (b) If she increases this force by 10%, what will her acceleration be? The mass of the person plus the bucket is 75kg.

Please explain and show me how to do this so that I can have a better understanding of this topic.

2006-10-18 14:24:00 · 1 answers · asked by hdwong58 3

The only information I have is the height at which the ball left the ramp, and the length from when the ball left the ramp to the location at which it landed.

2006-10-18 14:22:17 · 1 answers · asked by bep 2

2006-10-18 14:12:29 · 6 answers · asked by p 1

The intensity at a distance of 4 ft from an ordinary light bulb is ______ as great as that at a distance of 12 ft from the same bulb.
A. 43
B. 15
C. -18
D. 1/12
E. 5
F. 9
G. 18

2006-10-18 14:10:05 · 1 answers · asked by Anonymous

If Kevin pulls on it with a force 0.17 N larger than the force Gamals pulls with in the opposite direction, and the wishbone has a mass of 13 grams, what is the wishbone's initial acceleration.

Please help? I'm a little confused.

2006-10-18 14:07:40 · 1 answers · asked by vicky p 1

What is Efua's resulting acceleration?

2006-10-18 13:45:19 · 1 answers · asked by swimmertommy 1

say that a string with a stopper at the end is tied down to an opening and then the stopper blown vertically off the opening at 5 m/s. How can i calculate the force acting on the string when the string is fully extended into the air? I know the mass of the stopper is 0.012g, the string is 0.46 m long, and i have other information which i'm not sure is useful (f.x. the inital force acting on the stopper as it blows off the opening is 64 N) Can someone please show me this calculation? Assume no air

2006-10-18 13:42:27 · 2 answers · asked by Isabelle 2

If the ball is allowed to fall to the ground, what will its speed be the instant before it hits the ground?

2006-10-18 13:38:34 · 3 answers · asked by Daniel Black 1

I need help with this problem.
What formula would you use?

2006-10-18 13:29:33 · 5 answers · asked by swimmertommy 1

2006-10-18 13:26:57 · 4 answers · asked by jimcmillan 2