Physics - March 2007

2007-03-25 12:49:49 · 1 answers · asked by Anonymous

I need an equation for this:
There is a ballistic pendulum. The ball is in the cannon-like thing that is spring loaded. it is launched and it shoots into a pendulum where it gets stuck and makes the pendulum move to the right a certain number of degrees. I need an equation to describe this, so I can plug in numbers and get the original velocity of the ball when it's launched.

Help is MUCH appreciated!

2007-03-25 12:47:51 · 3 answers · asked by Sudha M 2

that I'm ever going to need for my intro physics class? The book that was assigned is so screwy.

2007-03-25 12:42:32 · 2 answers · asked by Casually Lame 1

2007-03-25 12:25:17 · 4 answers · asked by marie 1

was mass times acceleration. The problem is:

An object near the surface of the earth with a weight of 100 N is accelerated at 4 m/s/s. What is the net force on the object?

My book says the answer is 40 N, but if the formula is mass times acceleration, shouldn't the answer be 400 N? Can somone clarify this for me? Thanks.

2007-03-25 12:12:44 · 5 answers · asked by Anonymous

How would I go about this problem?

What is the magnitude and direction of the gravitational force that acts on a person that weighs 700 Newton on the surface of the earth?

Please help. Thanks.

2007-03-25 11:57:16 · 5 answers · asked by Anonymous

A billiard ball rolling across a table at 1.50 m/s makes a head on elastic collision with an identical ball. Find the speed of each ball after the collision (a) when the second ball is intially at rest (b) when the second ball is moving toward the first at a speed of 1.00 m/s, and (c) when the second ball is moving away from the first at a speed of 1.00 m/s.

2007-03-25 11:46:20 · 1 answers · asked by Whats the Scoop? 2

If the air temperature is 23.0 degrees celcius, how high was the helicopter flying?

2007-03-25 11:34:35 · 2 answers · asked by Anonymous

A 0.45-m copper rod with a mass of 0.17kg carries a current of 11A in the positive x direction. What are the magnitude and direction of the minimum magnetic field needed to levitate the rod?

2007-03-25 11:33:13 · 1 answers · asked by bigpapamarek 1

Find the radius of an electron's orbit when it moves perpendicular to a magnetic field of 0.45T with a speed of 6.27x10^5 m/s.

2007-03-25 11:31:40 · 2 answers · asked by bigpapamarek 1

2007-03-25 11:31:19 · 3 answers · asked by mister_or_guy 1

An electron moving with the speed of a 9.1x10^5 m/s in the positive x direction experiences zero magnetic force. When it moves in the positive y direction, it experiences a force of 2.0x10^-13N that points in the negative z direction. What is the direction and magnitude of the magnetic field?

2007-03-25 11:30:15 · 1 answers · asked by bigpapamarek 1

Isn't that an oddity of physics? I mean here you are, a little lightbulb in your hand - not much happening; then you put a diffuser or reflector behind it, and you get this huge burst of light. Doesn't that mean that the light has multiplied without extra energy input? That's impossible though. What's happening there?

2007-03-25 11:28:20 · 2 answers · asked by Tahini Classic 7

A 0.32-uC particle moves with a speed of 16m/s through a region where the magnetic field has a strength of 0.95T. At what angle to the field is the particle moving if the force exerted on it is 4.8x10^-6N.

Can someone just show me the formula to use.

2007-03-25 11:28:04 · 2 answers · asked by bigpapamarek 1

A hypothetical planet has seven times the mass of the earth and twice the radius of the Earth. The magnitude of the gravitational acceleration at the surface of this planet is most nearly______.

Thank you.

2007-03-25 11:28:01 · 5 answers · asked by Anonymous

So I thought, wouldn't it be awesome if my future self walked in with a completed essay write now? But isn't this some type of paradox? Say I get the essay from my future self, keep it for 10 or 20 years, then go back in time to give the essay to my present self. Where did the essay come from? What does it say? Who wrote it?

2007-03-25 11:27:34 · 7 answers · asked by lsupergeorgel 1

thank you

2007-03-25 11:26:22 · 2 answers · asked by Edgehead (Colts 2-1) 4

2007-03-25 11:25:09 · 2 answers · asked by BUTTERFLIEZ 2

please help, essay do tommorow. I got everything else, but this part, please help, i m almost done besides this.

2007-03-25 11:19:07 · 5 answers · asked by allisoncho7 2

A gas sample enclosed in a rigid metal container at room temperature (20) degrees celsius has an absolute pressure (p1). The container is immersed in hot water until it warms to 40 degrees celsius.

2007-03-25 11:17:44 · 2 answers · asked by RhondaJo 2

A. air escaping from a toy balloon
B. A rocket traveling through he air
C. A ball bouncing off a wall
D. All of the above

2007-03-25 11:17:19 · 1 answers · asked by Jen25 2

A projectile (mass = 0.214 kg) is fired at and embeds itself in a target (mass = 2.43 kg). (The target is initially stationary). The target (with the projectile in it) flies off after being struck. What percentage of the projectile's incident kinetic energy does the target (with the projectile in it) carry off after being struck?

2007-03-25 11:13:19 · 1 answers · asked by Kicks Galore! 4

13) An object becomes temporarily electrified if a charged object is placed near it. This
method of electrification is called
a) charging by friction b) charging by contact
c) charging by conduction d) charging by induction
e) charging by insulation

17) A point charge is placed in an electric field that varies with position. No force is
exerted on the charge
a) at positions where the potential is zero
b) at positions where the electric field is zero
c) when it is perpendicular to the electric field
d) when it is moving parallel to the electric field
e) if it is completely surrounded by other charges

18) The work per unit charge needed to move an electrical charge between two points is
measured in
a) joules b) volts
c) coulombs d) Newton/meter
e) Newton/coulomb

2007-03-25 11:10:39 · 2 answers · asked by krish s 1

Two questions;
1. Which way does the world spin? clockwise or anti clockwise.
2. I asked someone this question and he tried to make it sound complicated; 'which way are you looking at it from'. Why do people do this?

2007-03-25 10:54:01 · 8 answers · asked by Anonymous

An Atwood machine is constructed using a hoop with spokes of negligible mass. The 2.3 kg mass of the pulley is concentrated on its rim, which is a distance 24.5 cm from the axle. The mass on the right is 1.18 kg and on the left is 1.88 kg.

The acceleration of gravity is 9.8 m/s^2.

What is the magnitude of the linear acceleration a of the hanging masses? Answer in units of m/s^2.

2007-03-25 10:50:06 · 1 answers · asked by henryissac 1

Can things in space burn without oxygen? Would the temperatures have to be drastically different to make up for the lack of atmosphere and near vacuum and temperature drain?

2007-03-25 10:39:41 · 10 answers · asked by Luis 6

Does negative energy exist? I'm not talking about positive and negative charge, but more that the energy we have is positive, is there anything to totally negate it by being it's total opposite?

2007-03-25 10:25:38 · 9 answers · asked by Luis 6

If you could travel to just outside the Universe, could you occupy space there if there is none?

This can also be seen as, can you occupy space where there is no matter? As in can matter exist where there is no other matter?

2007-03-25 10:24:32 · 9 answers · asked by Luis 6

Do you personally believe that it is possible to cause an explosion in a car by shooting it, like in the movies?

2007-03-25 10:17:49 · 5 answers · asked by Daniel Y 2

The intensity of solar radiation at the top of Earth's atmosphere is 1340 W/m3. Assuming that 60% of the incoming solar energy reaches Earth's surface and assuming that you absorb 50% of the incident energy, make an order-of-magnitude estimate of the amount of solar energy you absorb in a 60 minute sunbath. (Assume that you occupy a 1.7 m by 0.3 m area of beach blanket and that the sun's angle of elevation is 60°.)
change in E = 10^___J

2007-03-25 10:16:05 · 1 answers · asked by Thumper 1