Physics - November 2006

2006-11-26 09:58:00 · 5 answers · asked by yourworstnightmare 1

Just can't find a suitable formula to calculate the force needed to crush an empty Coke- Can at its mid- point when laying horizontally. Where practicle tested carried out and the weigt needed for a Can to crush is 6kg which approx. to 58.86N. However research more then two weeks and still can't find the formula (theretical value)... Thanks

2006-11-26 09:40:53 · 1 answers · asked by Ken- Ni 1

Towns A & B are 80 KM apart. A couple arranges to drive from town A & meet a couple driving from town B at the lake, L. The two couples leave simultaneously and drive for 2.50 hrs. in the directions show (the gave me a pic- looks like a triangle). Car 1 has a speed of 90 km/h. If the cars drive simultaneously at the lake, what is the speed of car 2?

how would I find the speed of car 2 if car 1 is 90 km/h.... would I do Vy=gt... but it doesn't make sense...?

2006-11-26 09:38:23 · 3 answers · asked by Sheyna 1

Just generally.

2006-11-26 09:37:06 · 6 answers · asked by ankit b 1

A 4.75-g bullet is fired with a velocity of 120.0 m/s toward a 20.0-kg stationary solid block resting on a frictionless surface. What is the change in momentum of the bullet if it is embedded in the block?

2006-11-26 09:07:40 · 3 answers · asked by lindi 2

A 2.00-kg ball, A, is moving at a speed of 5.00 m/s. It collides with a stationary ball, B, of the same mass. After the collision, A moves off in a direction 30.0° to the left of its original direction. Ball B moves off in a direction 90.0° to the right of ball A's final direction. How fast is ball A moving after the collision?

2006-11-26 09:07:11 · 2 answers · asked by lindi 2

- A ball is projected horizontally from the edge of a table that is 1.00 m high, and it strikes the floor at a point 1.20 m from the base of the table. (a) What is the initial speed of the ball?(b) How high is the ball above the floor when it's velocity vector makes a 45 degree angle w/ the horizontal.

Ok. For (a).. I found the time to be .45 sec and used that to find the initial velocity which i found to be 2.67 m/s...
(b) is rlly confusing me... I don't get it at all... The angle is confusing me... I drew the projectile but ... SOMEONE HELP!

2006-11-26 08:51:25 · 2 answers · asked by Sheyna 1

Thanks

2006-11-26 08:46:51 · 8 answers · asked by Meow~ 4

It seems to me that the human mind can only think in 3 dimensions. But are there any suggestions out there as to how something can exist in 4 or more.

2006-11-26 08:45:48 · 8 answers · asked by Sebi 1

V = 120sin(120(pi)t) If a resistance of R = 20 ohms is present, what is the current I (using Ohm’s Law V = IR)? What is the amplitude and period of the current I?

2006-11-26 08:42:54 · 1 answers · asked by Anonymous

Output of a transformer is connected to a lamp rated 6V, 1.8W and the input is connected to a 220V supply

2006-11-26 08:33:40 · 1 answers · asked by Anonymous

in thermodynamics.

2006-11-26 08:16:56 · 3 answers · asked by true_friend 3

There is a simple a.c generator it consists of a coil of wire rotating between the poles of a permanent magnet! The output is fed to an external circuit through brushes making contact with two slip rings. state two factors on which the size of the output curretn depends!

2006-11-26 08:06:23 · 3 answers · asked by Anonymous

Find the limit at x approaches 2 of

(x^2 - 2) / (4 - x^2)

Please explain how you derive the answer. Thanks in advance.

2006-11-26 07:50:20 · 3 answers · asked by my nickname 2

who discoved it?
for what reason?
how was it discovered?
where was it discovered?

2006-11-26 07:45:24 · 2 answers · asked by taoster 2

A sled starts from rest at the top of a hemispherical frictionless hill of radius R. (Actually
you can assume the sled has a very small velocity when at the top. This velocity is sufficient
to start the sled, but can be neglected for the rest of the calculations.)
(a) Use conservation of mechanical energy (plus a bit of trigonometry) to find an expression
for the sled’s speed when it is at angle .
(b) Use Newton’s 2nd law and ideas of circular motion to find the maximum speed the sled
can have at angle without leaving the surface. (Hint: the maximum speed is that at
which the normal force becomes zero.)
(c) Combine the results of (a) and (b) to find the numerical value of the angle max at which
the sled flies off the hill. This angle is independent of the mass of the sled, radius of the
hill, or the local value of g.

2006-11-26 07:24:20 · 1 answers · asked by arvin k 1

A bear that weighs 4000 newtons grasps a vertical tree and slides down at constant velocity. What is the friction force that acts on the bear?

A crate remains at rest on a factory floor while you push on it with a horizontal force F, how big is the friction force exerted on the crate by the floor?

A parachutist, after opening the chute, finds herself gently floating downwardm no longer gaining speed. She feels the upward pull of her harness, while gravity pulls her down. Which of these two forces are greater? Or, could they be equal in magnitude?

2006-11-26 07:15:48 · 3 answers · asked by choddy 1

My question is how will I make the gravity racer more aerodynamic. The things about the race is for around 1 meter, the car will go down an incline and for the rest of the race it will go on a flat surface. Any suggestions about what I can do with how I assemble the wheels or cutting the wood in a particular shape or even decreasing the affects of air resistance. The answer I use regardless of how I finish will receive ten points.

2006-11-26 07:15:12 · 2 answers · asked by Anonymous

A massless spring of spring constant k=78.4 N/m is fixed on the left side of a level track. A block of mass m=0.5 kg is pressed against the spring and compresses it a distance of d. The block (initially at rest) is then released and travels toward a circular loop-the-loop of radius R=1.5 m. The entire track and the loop-the-loop are frictionless except for the section of track between A and B. Given that the coefficient of kinetic friction between the block and the track along AB is u=0.30, and that the length of AB is 2.5 m, determine the minimum compression, d, of the spring that enables the block to just make it through the loop-the-loop at point C. (Hint: the force of the track on the block will be zero if the block barely makes it through the loop-the-loop).

for the diagram for this problem, please go to http://i3.photobucket.com/albums/y92/musicis4fools2/physicsdiagram.jpg

THANKS!

2006-11-26 07:07:57 · 1 answers · asked by graycl0ud 1

How much energy is actually contained in a single atom, and if the energy was utilized to its fullest efficiency, how much power could that provide (ex. power a house for a year, power the world for a 100 years, etc...)?

2006-11-26 07:00:56 · 4 answers · asked by isipeoria 2

I got 128pi/3

2006-11-26 06:51:27 · 1 answers · asked by Olivia 4

a) that a positive test charge would move
b) that it randomly oriented
c) that a negative test charge would move

2006-11-26 06:34:55 · 1 answers · asked by gbmac722 2

An Airplane is traveling 25 degrees west of north at 300 m/s when a wind with velocity 100 m/s directed 35 degrees east of north begins to blow.Determine the speed and direction of the resultant velocity.

Please explain to me how to do this with a graph T_T

2006-11-26 06:32:14 · 5 answers · asked by Alex 1

And can you explain your answer(s)?

2006-11-26 06:29:30 · 2 answers · asked by Anonymous

A net external force is applied to a 6.90-kg object that is initially at rest. The net force component along the displacement of the object varies with the magnitude of the displacement as shown in the drawing.

(b) What is the speed of the object at s = 20.0 m?

Here's the picture

http://i143.photobucket.com/albums/r132/carlarnold1/wevb.jpg

2006-11-26 06:27:09 · 2 answers · asked by Anonymous

On a Keyboard you strike middle C, whose frequency is 256 Hz

(a) What is the period of one vibration of this tone?

(b) As the sound leaves the instrument at a speed of 340m/s, what is its wavelenght in air?

** Please show your work and please show the formulas or steps that you used** Make sure to say which answer is for what ().

2006-11-26 06:07:41 · 1 answers · asked by Gordito 1

I got .... 1296p/5

2006-11-26 06:01:03 · 2 answers · asked by Olivia 4

Find the volume of the solid formed by revolving the region bounded by x = 0, y = 0, and y = (7 - x)1/2 about the x-axis.


my answer ... 18p is this correct.

2006-11-26 05:59:29 · 1 answers · asked by Olivia 4

(continued) t of 12.5 amperes for 600 seconds?

2006-11-26 05:58:52 · 2 answers · asked by gbmac722 2

There's a box, held in place by friction, which rides on the flatbed of a truck, which is traveling at a constant speed v. The truck is riding on a circular road, going clockwise. For the diagram, please click here: http://i3.photobucket.com/albums/y92/musicis4fools2/physics3arrows.jpg

My question is, which way does static friction (fs) point towards? I already know which direction the normal force and gravity is, but I'm a little lost on which way static friction goes... on the diagram, is it in the direction of the blue, green, purple, or pink arrow?

2006-11-26 05:21:03 · 5 answers · asked by paulinatran10 1