Physics - October 2007

How can nothingness produce mass and energy ?

If you must revert to a magic eye-in-the-sky, (like a Flying Spagetti Monster, God, Easter Bunny, or the Invisable Pink Unicorn, etc.), then what produced that deity ?

Please at least try to use facts, please...

2007-10-22 14:55:44 · 6 answers · asked by Jesus H. Zeitgeist 3

2007-10-22 14:50:26 · 11 answers · asked by Anonymous

Do you think the ocean floor contains any living things?

2007-10-22 14:26:19 · 5 answers · asked by sk8terchick818 2

I know these reasons: you using force to accelerate, gravity so we don't fly off, also the Universal force of Gravitation.........
I just need the others and their reason.

2007-10-22 14:15:05 · 4 answers · asked by Fei Lin W 1

2007-10-22 13:07:46 · 5 answers · asked by nak1uander 1

2007-10-22 12:50:14 · 3 answers · asked by flavia r 1

A hunter aims directly at a target (on the same level) 160 m away.
(a) If the bullet leaves the gun at a speed of 220 m/s, by how much will it miss the target?
___ m
(b) At what angle should the gun be aimed so the target will be hit?
___°

2007-10-22 12:38:57 · 1 answers · asked by Jon R 1

Hi. I have THREE questions. I tried them myself, but I'm confused. Please help!

1. If the force of friction on the crate is a steady 70 N, and it is pushed along a 10 m factory floor, how much KE is gained by the crate? (Is the answer 3500 MJ?)

2. A force of 50 N is applied to the end of a lever which is moved a certain distance. If the other end of the lever moves one third as far, how much force can it exert? (I don't even know how to start this one)

3. Consider an ideal pulley system. If you pull one end of the rope down with 50 N a distance of 1 meter, how high will you lift a 200 N load? (I don't know what to do here either!)

Please explain/give examples if necessary. The answers don't have to be long, but enough to understand the concepts. :)

Thank You!

2007-10-22 12:34:21 · 1 answers · asked by b 5

2007-10-22 12:20:57 · 3 answers · asked by BlueManticore 6

an inclined plane id 10 meters high. an effort force of 200 newtons id required to pull an 800 newton cart up the incline.

what is its innput.

it output.


its work done against friction.

2007-10-22 11:33:32 · 1 answers · asked by :}smile :} 1

When giving directions to your house, you tell
someone to drive two miles east, then three
miles north, then one mile west.
What are the components of a vector that
points from his house to yours?
1. The east component of the vector is three
miles; the south component is 3 miles.
2. The east component of the vector is 1
mile; the south component is 3 miles.
3. The west component of the vector is 1
mile; the north component is 3 miles.
4. None of these.
5. The east component of the vector is 1
mile; the north component is 3 miles.
6. The west component of the vector is three
miles; the north component is 3 miles.
7. The west component of the vector is 1
mile; the south component is 3 miles.

2007-10-22 11:32:26 · 1 answers · asked by Anonymous

the only materials that can be used are cardboard, tape and glue. the project must be a light weight because the more the project weighs in GRAMS the more points taken off from 650. so it has to weigh as light as possible. the project will FREE FALL from the top of the bleachers of high school stands. the project must hit the target below and there will be a time limit of getting the egg out of the project and if the egg breaks in that process, it's a fail. There shouldn't be anything on the egg (no tape, no glue) when presenting it to the teacher before the egg is dropped and after it is dropped. the teacher should be able to take a sharpie marker and make a mark on the egg while the egg is in the project before it is dropped. this project is due Oct 26, 2007! please help!!!

2007-10-22 10:24:12 · 4 answers · asked by Anonymous

There is a moon orbiting an Earth like planet. The mass of the moon is 4.74 x 10^22 kg, the center to center separation of the planet and the moon is 285,000 km, the orbital period of the moon is 27.7 days, and the radius of the moon is 1770 km. What is the angular momentum of the moon about the planet? Answer in units of kg m^2/s.

2007-10-22 09:33:50 · 1 answers · asked by Ron108 1

A wheel with massless spokes has an inner rim at r=1/2R and an outer rim at r=R. Each rim has mass 1/3M. What is the moment of inertia of the wheel about its axle???

2007-10-22 09:28:10 · 1 answers · asked by Ron108 1

A grinding wheel is in the form of a uniform solid disk of radius 6.33 cm and mass 1.3 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.793 Nm that the motor exerts on the wheel.
-How long does the wheel take to reach its final speed of 1590 rev/min? Answer in s.
b) Through how many revolutions does it turn while accelerating? Answer in rev.
Please help!!!! THANKSS!!!

2007-10-22 09:26:24 · 1 answers · asked by Ron108 1

Your answer should include not simply words, but also diagrams and quantitative analysis.

2007-10-22 08:36:34 · 3 answers · asked by Anonymous

2007-10-22 08:26:14 · 3 answers · asked by ace 1

A uniform disk with a mass of 35.5 kg and a radius of 0.424 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as the drawing indicates.
(a) What is the net torque produced by the two forces?
(b) What is the angular acceleration of the disk?

2007-10-22 07:46:17 · 3 answers · asked by Anonymous

Gayle runs at a speed of 4.00 m/s and dives on a sled, initially at rest on top of a frictionless snow-covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at the bottom of the hill if the total vertical drop is 15.0 m? Gayle's mass is 50.0 kg, the sled has a mass of 5.00 kg, and her brother's mass is 30.0 kg.

2007-10-22 07:36:35 · 2 answers · asked by Captain Whiskerboy Litterbox 3

A vector A points 14° from the x axis. Vector B is twice as long as A. Their product A×B has length A^2 and points in the negative z direction. What is the direction of the vector B?

2007-10-22 07:01:47 · 2 answers · asked by wil 1

1. The mass m1 is 0.63 kg and it is located at x1 = 30 cm. The pivot point is located at x = 45 cm. The mass of the meter stick (mms = 0.40 kg) is located at its geometric center, xms = 50 cm. The mass m2 is 0.35 kg and it is located at x2 = 80 cm. Calculate the net torque (in N⋅m with the proper sign) due to these three weights (Use g = 9.8 m/s2).



2. Suppose that a meter stick is balanced at its center. A 0.27-kg is positioned at 20 cm from the left end of the meter stick. Where should a 0.30 kg mass be placed to balance the 0.27 kg mass? Express your answer in terms of the position (in cm) of the 0.30-kg mass as measured from the left end of the meter stick.

2007-10-22 06:56:38 · 1 answers · asked by davidbbk 1

The magnitude of the net force exerted in the x direction on a 3.15 kg particle varies in time as shown in the figure below.

There is a graph that is supposed to be here. The y-axis is F(N) and the x-axis is t(s)
It starts from the orgin then goes to point (2,4), then to (3,4), then ends at (0,5). Im sorry if this looks confusing, but it wouldnt let me post the graph.

(a) Find the impulse of the force. The answer to this one is 12.0 N-s

(b) Find the final velocity the particle attains if it is originally at rest.
i m/s

(c) Find its final velocity if its original velocity is -3.4 m/s .
i m/s

(d) Find the average force exerted on the particle for the time interval between 0 and 5.00 s.
N

2007-10-22 06:19:35 · 1 answers · asked by surfing86 2

A m1 = 0.550 kg block is released from rest at the top of a frictionless track h1 = 2.65 m above the top of a table. It then collides elastically with a 1.00 kg block that is initially at rest on the table, as shown in Figure P6.57.

http://www.webassign.net/sf/p6_57alt.gif

(a) Determine the velocities of the two objects just after the collision.
velocity of m1:
velocity of m2:

(b) How high up the track does the 0.550 kg object travel back after the collision?

(c) How far away from the bottom of the table does the 1.00 kg object land, given that the table is 2.20 m high?

(d) How far away from the bottom of the table does the 0.550 kg object eventually land?

2007-10-22 06:17:56 · 2 answers · asked by Anonymous

0.052 nm (a wavelength contained in medical X-rays)

2007-10-22 06:14:48 · 1 answers · asked by Anonymous

A wooden block of mass m = 9 kg starts from rest on an inclined plane sloped at an angle q from the horizontal. The block is originally located 5m from the bottom of the plane.

If the block, undergoing constant acceleration down the ramp, slides to the bottom in t = 2 s, and q = 30°, what is the magnitude of the kinetic frictional force on the block?

2007-10-22 06:04:45 · 2 answers · asked by GirlYgIRL 1

I already found the magnitude of the acceleration, but I can't figure out how to calculate the coefficient of kinetic friction for the incline.
I've looked at other questions/answers, none have helped me get the right answer on this one.

2007-10-22 05:23:29 · 3 answers · asked by Anonymous

can someone explain the answer to question 2?

http://class.phys.psu.edu/212Recitations/07_Circuits/RC_Circuits.pdf

2007-10-22 05:13:01 · 3 answers · asked by Anonymous

During a tennis serve, a racket is given an angular acceleration of magnitude 125 rad/s2. At the top of the serve, the racket has an angular speed of 13 rad/s. If the distance between the top of the racket and the shoulder is 1.0 m, find the magnitude of the total acceleration of the top of the racket.

2007-10-22 05:11:47 · 2 answers · asked by puji831 1

a. it is a main-sequence star.

b. it is a giant star.

c. the star is at a distance of 10 light years.

d. the star is at a distance of 10 parsecs.

2007-10-22 04:56:46 · 2 answers · asked by Anonymous

a. luminosity of stars.

b. masses of binary stars.

c. masses of individual stars.

d. stellar parallax.

2007-10-22 04:36:18 · 2 answers · asked by Jacquisha R 1