Physics - October 2006

((([N S]))) | ((([N S])))

The material needs to act as a shield between two magnets to keep them from being attracted to each other. Likewise, they can't be attracted to the shield, either (which rules out Mumetal, Ni, Co, etc.)

2006-10-23 13:11:48 · 5 answers · asked by 'Ric 2

2006-10-23 12:09:07 · 6 answers · asked by JOHN A 1

1. A worker pulls a sled with a force of 80 N directed at an angle of 60 degrees above the horizontal over a level distance of 6 m. If a frictional force of 24 N acts on the sled in a direction opposite to that of the worker, what net work is done on the sled?

a. 240 J, b. 216 J, c. 144 J, d. 96 J


2. A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:

a. momentum is conserved in this process
b. the fuel pushes on the ground
c. air friction pushes on the escaping fuel
d. the downward force of gravity is less than the downward momentum of the fuel

please explain why you believe the answers are what they are just in case yours are different than mine. thanks a lot guys!

2006-10-23 12:03:46 · 3 answers · asked by Anonymous

Im in 9th grade and im doing an egg drop. Whats the best idea for an egg drop down 2 stories. it has to hold the egg, not act as a landing platform.

2006-10-23 11:59:28 · 3 answers · asked by iStudy 1

The 7 g dart, fired straight upward, reaches a maximum height of 24 m. Determine the energy dissipated by air friction during the dart's ascent.
Estimate the speed of the projectile when it returns to its starting point.

2006-10-23 11:58:43 · 2 answers · asked by Dan L 1

2006-10-23 11:54:34 · 6 answers · asked by MKoh 1

Is heat the issue? Was the alloy to hot during the pour? What is the recomended flow heat?

2006-10-23 11:53:30 · 1 answers · asked by pouring_metal 1

A uniform door weighs 50.0 N and is 0.9 m wide and 2.7 m high. What is the magnitude of the torque due to the door's own weight about a horizontal axis perpendicular to the door and passing through a corner?

2006-10-23 11:49:58 · 2 answers · asked by David S 2

I need help... I dont understnad the electromagnetic spectrum and how color works.. HELP!

2006-10-23 11:37:39 · 3 answers · asked by Upon this rock 3

Also, where does the energy come from?

2006-10-23 11:33:28 · 3 answers · asked by Anonymous

2006-10-23 11:29:14 · 7 answers · asked by lopezgrl14 1

2006-10-23 11:18:43 · 6 answers · asked by lopezgrl14 1

I could not find any doctor to answer these so i thought you could help.
Here are my questions. Feel free to skip any questions. I really appreciate your time.

1. Why should a DR. use optic fibers in their day to day, or during surgery?
2. What are the benefits if any of using them?
3. Who developed optic fiber for use in the medical field?
4. How far will medicine advance to where the need for these is obsolete?
5. How do you feel about using optic fibers in the medical field?

Please i need this badly!
Thanks.

2006-10-23 11:09:06 · 3 answers · asked by Anonymous

2006-10-23 10:46:55 · 7 answers · asked by Anonymous

Your car rolls slowly in a parking lot and bangs into the metal base of a light pole. In terms of safety, is it better for your collision with the light pole to be elastic, inelastic, or is the safety risk the same for either case?

2006-10-23 10:26:29 · 1 answers · asked by AnnaQ 1

2006-10-23 10:25:37 · 10 answers · asked by dave p 1

to an angular speed of 17.3 rad/s in 2.46 s. It started from rest.

A) What is the magnitude of the angular acceleration of the wheel in units of rad/s^2?

B) What is the angle in radians through which it rotate in this time (in units of rad)?

2006-10-23 10:12:35 · 1 answers · asked by Dee 4

1. the work done on the object is positive
2. the work done on the object is negative
3. the work done on the object depends on the magnitude and direction of the force
4. no work is done

2006-10-23 10:08:01 · 5 answers · asked by Foamy H 1

a constant force is 150 n used to pull a box along a floor at a constant speed. the weight of the box is 450 N.
a) what is the upward perpendicular force exerted by the floor on the box?
b) what is the net force acting on the object if friction is 50 N.

2006-10-23 10:02:34 · 2 answers · asked by lincolngomes301 2

a racing car moves at an average speed of 10 m/s for a total time of 90 s. calculate the total distance traveled by the car within that time.

2006-10-23 10:00:36 · 4 answers · asked by lincolngomes301 2

By what factor does an object's kinetic energy change if its speed is doubled? By what factor does its momentum change?

2006-10-23 09:54:46 · 3 answers · asked by AnnaQ 1

Describe the changes in kinetic energy and in gravitational potential energy.

2006-10-23 09:44:24 · 3 answers · asked by Anonymous

2006-10-23 09:39:59 · 3 answers · asked by lincolngomes301 2

Scuffing the ball is considered cheating in baseball. The idea is that it makes the ball cruve more when a curveball is thrown. Is this effect for real, and is this because it gives the pitcher better grip? It seems to me that other than that , it woudl not make a major impact on the physics of the ball flight.
If anything it woudl only create more turblant airflow around the ball and make it curve less. am I wrong here?

2006-10-23 09:39:50 · 3 answers · asked by abcdefghijk 4

In other words why do some hours and minutes fly while others appear to drag? Why do we experience identical lengths of time differently?

2006-10-23 09:33:37 · 4 answers · asked by nicemachine 2

2006-10-23 09:24:04 · 17 answers · asked by Richard C 2

You know well!

2006-10-23 09:18:40 · 6 answers · asked by Live & Let Live! 1

Can you lift your weight using a pulley and rope, or would you just be lifting your body off the ground because the load is heavier than you, like a pull up.

2006-10-23 09:09:14 · 10 answers · asked by pulleyman123 2

I ran a 12V 1700mA battery recharger off a 12V 500mA voltage adaptor, and the adaptor died. Why? And how close do the mA ratings need to be for this not to happen?

2006-10-23 09:05:44 · 5 answers · asked by Sven T 1

Got a tough one here.
A 2.kg block on a frictionless plane inclined at 30 degrees from horizontal has a force F acting on it upward parallel to the incline. The block is accerlating downward at 2.0 m/s. Find F.

I assumed it was the F=ma eqation

F = 2kg*2.0 = 4N

I know its not that easy and cos 30 comes in somewhere.. can you point me in the right direction?

2006-10-23 09:00:59 · 3 answers · asked by Haley 2