Physics - November 2007

Please explain it in a layman's term.

2007-11-05 13:21:57 · 3 answers · asked by Perak Man 1

2007-11-05 13:17:24 · 1 answers · asked by Anonymous

A 60.0 kg crate is attached to a weight by a cord that passes over a frictionless pulley. (1) If the coefficient of friction is 0.500, what weight will keep the crate moving up a 40 degrees incline at a constant speed? (2) If the cord is cut when the crate is at rest at the top of the incline, how far would the crate have slid by the time its speed reached 7.50 m/s?

Where do I even start? Can someone please explain this to me. I would be very, very thankful. Thanks.

2007-11-05 13:16:07 · 1 answers · asked by ☺♠JonasJay♫♦ 5

pls answer this.

2007-11-05 13:14:06 · 12 answers · asked by jE B 1

2007-11-05 12:59:55 · 1 answers · asked by Anonymous

A 873-kg (1930-lb) dragster, starting from rest, attains a speed of 26.3 m/s (58.9 mph) in 0.59s.

My teacher is only making us do book work and i'm really stressing because i don't know how to dso this, we're barely learning about forces.... help and thankyou

2007-11-05 12:56:56 · 2 answers · asked by Anonymous

2007-11-05 12:53:15 · 1 answers · asked by Anonymous

I have a question regarding physics.
Its about launching a spring at various targets (bucket) at different distances and heights.

WHat would be the equation to find the amount of stretch from equilibrium (in the string) i.e. x. We are given the vertical height, horizontal distance, the constant of the spring (k) and

Any help would be appreciated. Thank you in advance

2007-11-05 12:44:28 · 1 answers · asked by Anonymous

2007-11-05 12:40:27 · 3 answers · asked by Anonymous

Ok my first beef is with the big bang theory. You are siuggesting that the universe was created from an explosion, and is expanding...but the universe is nothing. So "nothing" was created from a massive explosion? So if the big bang created the universe, which is nothing, then you are suggesting that there was something there before this massive explosion. So what was there? The way i see it, the universe is infinite. Nothingness goes on forever and ever...and even if you could reach the edge of the universe...what is on the other side?

2) Special Relativity. You are trying to tell me that such properties as mass, time, and length will be altered by going at the speed of light or close to that speed? That violates such basic rules as the conservation of mass does it not? The way I see it, my mass is the same sitting here at the computer as it is going the speed of light in a warship. Please clarify these two things for me

2007-11-05 12:40:17 · 2 answers · asked by Anonymous

You and your friend throw balloons filled with
water from the roof of a several story apart-
ment house. You simply drop a balloon from
rest. A second balloon is thrown downward
by your friend 2.3 s later with an initial speed
of 45.08 m/s. They hit the ground simultane-
ously.
The acceleration of gravity is 9.8 m/s2 : You
can neglect air resistance.
How high is the apartment house? Answer in m

2007-11-05 12:29:05 · 2 answers · asked by Handiman 3

? thanks

2007-11-05 12:27:36 · 2 answers · asked by Anonymous

2007-11-05 12:22:57 · 2 answers · asked by Steph M 1

A car starting from rest moves with constant acceleration of 3.1 m/s^2 for 13 s, then travels with constant speed for another 19 s, and then finally slows to a stop with constant acceleration of -8.5 m/s^2. How far does it travel in meters?

Steps please. Thanks =)

2007-11-05 12:22:28 · 1 answers · asked by kickitup21 1

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.20 and the push imparts an initial speed of 4.0 m/s?

2007-11-05 12:19:35 · 1 answers · asked by Anonymous

Suppose that the speed of a ball moving in a horizontal circle is increasing at a steady rate. Is this increase in speed produced by the centripetal acceleration? Explain

2007-11-05 12:17:38 · 1 answers · asked by Anonymous

(Again, not using this for homework but studying purposes, thanks) Also, I got the answer to the first part, just wondering about the second part.

A star has a mass of 1.40X10^30kg and is moving in a circular orbit about the center of its galaxy. The radius of the orbit is 3.9x10^4 light years (1 light year = 9.5 X 10^15m), and the angular speed of the star is 2.1X10^-15 rad/s. (a) Determine the tangential speed of the star. (b) What is the magnitude of the net force that acts on the star to keep it moving around the center of the galaxy?

The tangential speed = 7.8X10^5 m/s
and assuming you need the radius for (b), it works out to be 3.7X10^20m

2007-11-05 12:17:17 · 1 answers · asked by a.pasternak 2

2007-11-05 12:16:44 · 18 answers · asked by Kyle 1

Does anyone know where we can find plans online for a Tesla anti-gravity machine. Please provide a link. Thank you.

2007-11-05 12:04:51 · 3 answers · asked by dlln5559 2

here is the science question being asked.

-why is it that when no external force acts, momentum doesnt change, but it is conserved?



i know, it's dumb.

2007-11-05 11:04:39 · 5 answers · asked by alyssa_17t 1

2007-11-05 11:01:38 · 3 answers · asked by Anonymous

Why does a child in a wagon seem to fall backward when you give the wagon a sharp pull?

Please explain answer in 2-3 sentences clearly.

2007-11-05 11:01:03 · 3 answers · asked by nirmal 1

Ok. What if there was no mantle or core in the Earth, it was all crust. And You dug to the center of the Earth. Now someone on the other side of the world digs a hole opposite of your hole. If someone falls into your hole then what would happen when they reached the center? Gravity is still in play here. Wouldn't you just float in the middle? The exact middle?

2007-11-05 10:50:36 · 3 answers · asked by Anonymous

Edward Palonek asks can you explain in plain english what the "colour" of a quark is, what it does and what its properties are? Thanks
http://palonek.ca/

2007-11-05 10:49:12 · 3 answers · asked by Edward Palonek™ 2

A 1270 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1860 N crate hangs from the far end of the beam

(a) Calculate the magnitude of the tension in the wire. Newtons

(b) Calculate the magnitude of the horizontal and vertical components of the force that the wall exerts on the left end of the beam

Fx = N
Fy = N

http://img107.imageshack.us/img107/9378/p966altcu2.gif

2007-11-05 10:36:42 · 1 answers · asked by Anonymous

Has anyone read the Cosmic Forces of Mu by James Churchward? Any interesting truths to be found there that might explain causes of gravity and the other 3 major forces of the universe? If there are 11 or 20 dimensions are we talking about physical dimensions? Or astral? Or something else? The mystics speak of many dimensions other than the 4 we know of the physical plane.

2007-11-05 10:31:53 · 4 answers · asked by Virginia G. 2

A ball of radius 0.212m rolls along a horizontal table top with a constant linear speed of 5.51m/s. The ball rolls off the edge and falls a vertical distance of 2.17m before hitting the floor. What is the angular displacement of the ball while it is in the air?

(I am not using this for a homework question but am studying questions from a textbook. It would be great if I could learn how to approach this question, thanks!)

2007-11-05 10:28:22 · 2 answers · asked by a.pasternak 2

An 7.30-cm-diameter, 370 g sphere is released from rest at the top of a 1.50-m-long, 19.0 degree incline. It rolls, without slipping, to the bottom. What is the sphere's angular velocity at the bottom of the incline? What fraction of its kinetic energy is rotational?

2007-11-05 10:23:10 · 1 answers · asked by rochesmk 2

What is the speed of the stuck trucks? (hint momentum is conserved)

2007-11-05 10:00:02 · 1 answers · asked by Chris 1

Pete slides a crate up a ramp at an angle of
27.6 degrees by exerting a 239 N force parallel to the
ramp. The crate moves at constant speed.
The cofficient of friction is 0.112.
How much work has been done against
gravity when the crate is raised a vertical
distance of 1.52 m? Answer in units of J.

2007-11-05 09:59:13 · 2 answers · asked by Handiman 3