Physics - October 2006

Between the sled and the plane the coefficient of static friction is 0.26, and the coefficient of kinetic friction is 0.19. What is the minimum magnitude of the force F, parallel to the plane, athat will prevent the sled from slipping down teh plane? what si the minimum magnitude F taht will start teh sled mobing up the plaen? What value of F is requuired to move the block up the plane at constant velocity?

2006-10-26 15:36:25 · 1 answers · asked by Anonymous

A car is traveling at 33.4 mi/h on a horizontal highway. The acceleration of gravity is 9.8 m/s2. If the coefficient of friction between road and tires on a rainy day is 0.1 what is the minimum distance in which the car will stop ? (1mile = 1.609 kilometers )

2006-10-26 15:34:10 · 3 answers · asked by Anonymous

I forget my junior high physics.

2006-10-26 15:22:19 · 2 answers · asked by Anonymous

A block is being held against a vertical wall at a 40 degree angle with respect to the Y-axis. The weight of the block is 87.6 N. The coefficient of static friction between the block and the vertical wall is 0.540. What minimum force is required to prevent the block from sliding down the wall? What minimum force is required to start the block moving up the wall?


Where do i use the static friction coefficient? Do I use pathagorean's to find the forces at the vertical and horizontal? where does gravity come into play? any help would be great!!!

2006-10-26 15:19:18 · 4 answers · asked by Any help? 1

I plan on using a large rare earth magnet, bismuth and a small ring rare earth magnet. The trick I'm trying is to levitate items attached to the levitating magnet with a 3 inch gap. Will a pyramid stack with a spread out field work or will one large Neodymium disc magnet work better. If I build the pyramid design by gluing a group of small Neodymium magnets, will they all need to be facing the same pole? Thanks to all who read this and to those who reply.

2006-10-26 15:14:23 · 5 answers · asked by burnholywater 2

how does the size of the force of the cannon on the cannonball compare with the force of the cannonball on the connon? how does the acceleration of the cannon compare with that of the cannonball? Defend your answer.

2006-10-26 15:01:44 · 7 answers · asked by water yu 3

independent, dependant, direct or indirect?

2006-10-26 14:45:46 · 3 answers · asked by foxy lady 2

If i have a magnet, and i only want to make the force go in one direction, is that possible? If so, how can I do it?

2006-10-26 14:33:18 · 2 answers · asked by shimmykin 1

I need to calculate the total initial and final kinetic energy for an inelastic and perfectly elastic collision. The problem I am having is understanding which variables to use to solve the kinetic energy equations.

The first part of the problem I have the average intial velocity of a large glider (V1): 53.7cm/s
The second part of the problem I have the average velocity of the large glider after the collision (V2): 74.6 cm/s
And the third part of the problem I have the average velocity of the small glider after the collision (V3): 20.4

Any help with this would be greatly appreciated, since the physics department at my college is horrible and I have no access to a tutor. Thanks!

2006-10-26 14:24:22 · 2 answers · asked by Anonymous

A bullet is fired horizontally from a tower 45 m high at a speed of 350 m/s. How far downrange will the bullet travel?
i know the answers 1050m but how do you get it

2006-10-26 13:48:11 · 2 answers · asked by globesk8er999 1

describe the horizontal component of velocity of a rock thrown at a 60 degree angle througout the flight

2006-10-26 13:46:15 · 2 answers · asked by globesk8er999 1

An elevator weighing 200000 N is supported by a steel cable. What is the tension in the cable when the elevator is accelerated upward at a rate of 3 m/s^2? (g = 9.81 m/s^2)

-please don't forget proper units and that weight is different than mass
-I really need your help, and best answer wins 10 pts!!
-SHOW UR WORK PLEASE!!

2006-10-26 13:44:12 · 2 answers · asked by shelly 4

I thought the voltage value was dependant on the current V=IR so how can the voltmeter measure the voltage with little current running through it. Same for the ammeter to measure I (current) without potential difference(voltage) between the terminals. I jsut don't get that part. Trying to get ready for my Physics II test. I know I'm looking at it the wrong way. Help me!

2006-10-26 13:43:21 · 5 answers · asked by ElDarado05 2

1) what is the relation of a horsepower to a watt?

2) how is a BTU reated to the joule?


no, this is NOT my homework...i just need the answers cuz i have a test tomorrow please help me!!

thanks

2006-10-26 12:42:37 · 6 answers · asked by Anonymous

Will the bolt vaporize? Will there be a flash of light? Would there be a deafening sonic crack from the rapid expansion of air? How wide would the vapor trail from a 4mm bolt be (ballpark)? How far will it fly before its energy is dispersed in the atmosphere? How near a miss would be dangerous to a human? Deadly? Anything else I should know?

This is going to be my sci-fi weapon, so I want to know how to describe what will happen. I know the energy requirements are enormous, but the Star Wars hand blaster *supposedly* has an average energy output around 8-10 megajoules, which I remember being about a 4mm X 2cm iron bolt at 125 kps.

*The marksman need not fall backward: recoil is absorbed by a heavy metal lug of carefully calculated mass, which moves back extremely quickly with each shot, and is replaced *relatively* slowly after each shot.
This also serves as the action bolt, whose movement allows the next projectile bolt to be pushed into the breech...

2006-10-26 12:38:56 · 7 answers · asked by A Box of Signs 4

if i had a cube constructed of mirror glass with the mirrors facing inwards and I fired a laser into it would it simply bounce around ad infinitum?

2006-10-26 12:09:34 · 6 answers · asked by lionel b 1

I need to know why pool balls go off in two directions (creating a 90 degree angle) after making contact.

2006-10-26 11:57:54 · 2 answers · asked by Bastronaught 2

2006-10-26 11:48:30 · 6 answers · asked by Dominic R 1

A sled with a mass of 50kg is pulled along a flat, snow-covered ground. The static friction coefficient is .30.

My answer was 1470 Newtons, but I want to see if that is correct.

thanks in advance.

2006-10-26 11:15:44 · 3 answers · asked by Jer G 3

you know the water vapor condenses fromm air when the air temperature is lowered. should it be possible to condense oxygen from air? what would have to happen?

2006-10-26 11:03:49 · 6 answers · asked by hey 3

explain how a pat of butter at room temperature can be considered to be frozen?

2006-10-26 11:02:07 · 6 answers · asked by hey 3

2006-10-26 10:36:00 · 8 answers · asked by Anonymous

2006-10-26 10:26:04 · 5 answers · asked by Anonymous

2006-10-26 10:03:24 · 4 answers · asked by A 2

A 0.066 kg arrow is fired horizontally. The bowstring exerts an average force of 75 N on the arrow over a distance of 0.85 m. With what speed does the arrow leave the bow?

2006-10-26 09:52:32 · 1 answers · asked by Jim E 1

2006-10-26 09:52:10 · 11 answers · asked by Deedra J 1

2006-10-26 09:50:56 · 4 answers · asked by Deedra J 1

A rocket is used to place a synchronous satellite in orbit about the earth. What is the speed of the satellite in orbit?

2006-10-26 09:41:41 · 11 answers · asked by Jim E 1

2006-10-26 09:18:52 · 15 answers · asked by Anonymous

we at this moment are in many gravitaional fields ie the earth, the sun, the galaxy etc these all affect time or our perception of it at least but what would happen if we moved into intergalatic space away from external sources of gravity, what would be the effects if we could go and come back from such a place?

2006-10-26 08:59:46 · 13 answers · asked by clearair1234 2