Physics - February 2007

2007-02-12 00:14:38 · 2 answers · asked by john s 1

2007-02-11 23:59:02 · 8 answers · asked by frecia 123 1

A block starts from rest at the top of a 13.degree inclined plane and encounters a spring,of constant 4.5kN/m,rigidly attached to the plane.The blocks mass 64kg and it compresses the spring by 60cm.

2007-02-11 23:48:16 · 1 answers · asked by RhondaJo 2

An object initially at rest explodes in two fragments of masses 4.8kg & 1.8kg that move in diametrically opposite directions.

2007-02-11 23:40:09 · 2 answers · asked by RhondaJo 2

its to do with PCR

2007-02-11 23:23:15 · 1 answers · asked by kat m 1

1. How many electrons should be removed from a neutral object to give it a charge of = 1 uC?

2. How far apart should two electrons be placed so that the force of repulsion between them is
(a) 1N
(b) same as the weight of an electron on the surface of the earth

3. Two small metal spheres initially neutral are placed 3.0m apart. Now one billion electrons are transferred from one sphere to the other. Determine the charge on each sphere and the force between them.

4. The force of repulsion between two point charges placed 6.0m apart is 5.0 * 10^9 N. If one charge has twice the magnitude of the other, determine those magnitudes.

5. Two point charges of +6 uC and - 4 uC are placed in a plane at the points (6m,-2m) and (0m,4m). Determine the magnitude and the direction of force on each.

2007-02-11 23:00:50 · 1 answers · asked by Anonymous

2007-02-11 22:51:11 · 5 answers · asked by rohitvijaysharma 1

word or expression in the first column


__ aristotles theory of motion
__galileos theory of motion
__law of universal gravitation
__a=g
__mass
__weight
__projectile
__freely falling body
__w over g
__trajectory

a)bullet fired from a gun
b)9.8 m/s squared
c)a measure of the gravitational force on an object
d)path followed by a projectile
e)mass
f)a measure of inertia
g)all objects on earth fall with the same constant acceleration due to gravity in the absence of air
h)heavy objects fall faster than light objects
i)Fg=Gm1m2 over d2
j) uniformly accelerated motion

2007-02-11 22:36:34 · 1 answers · asked by paolo b 1

2007-02-11 22:34:28 · 1 answers · asked by curious 2

Heat of fusion

Another purpose of stirring the mixture(water and ice) in the experiment?

2007-02-11 22:34:24 · 3 answers · asked by jppd12689 3

can this force produce an acceleration if its magnitude is less than the weight of the block of wood?

2007-02-11 22:14:23 · 3 answers · asked by paolo b 1

2007-02-11 22:04:45 · 2 answers · asked by paolo b 1

2007-02-11 22:01:56 · 4 answers · asked by Samlovesjesea 1

The answer should be related with the concept of friction

2007-02-11 21:17:23 · 1 answers · asked by Samlovesjesea 1

2007-02-11 21:14:33 · 6 answers · asked by Anonymous

I mean a function of the form

x(t) = at^3 + bt^2 + ct + d.

Why or why not?

2007-02-11 21:13:45 · 3 answers · asked by Anonymous

2007-02-11 21:12:49 · 10 answers · asked by Anonymous

*the slow acceleration of a large truck compared to that of a car.
*a car that still moves for a short period even after the brakes have been applied.
*a passenger standing in a fully loaded bus which is at rest tends to move backward when the driver suddenly starts the bus

2007-02-11 21:09:50 · 2 answers · asked by Anonymous

Sound Resonance

1. Measure the distance from he open end of the tube to the water level. Record this as the first resonance length(L1)

2. Determine the second resonance by allowing the level of water to go down further until the loudest sound is produced.

3. Measure the distance from the open end of the tube to the water level. Record this as the second resonance length(L2)

4. Carefully measure the inner diameter of the tube by using a vernier caliper and record it. From the inner diameter, determine the inner radius and then take 57% of the inner radius as correction "c" factor which is to be addedto the measured resonance lengths

5. Compute the speed of sound in air from the equations:

First resonance: V1=4f(L1+C)
Second resonance: V2=(4f(L2+c))/3

2007-02-11 21:05:41 · 1 answers · asked by jppd12689 3

My TA and professor are almost virtually inaccessible and this book says absolutely NOTHING on anything but "final velocity - initial velocity / time"...
...or, if you could explain it using numbers...

An object traveled .239 meters in 2.10295 seconds. What is the acceleration?

Thanks...

2007-02-11 19:57:28 · 7 answers · asked by Telkandore 2

A student tries to raise a chain consisting of three identical links. Each link has a mass of 380 g. The three-piece chain is connected to a string and then suspended vertically, with the student holding the upper end of the string and pulling upward. Because of the student's pull, an upward force of 15.0 N is applied to the chain by the string. Use Newton's laws to answer the following questions.

a. Find the acceleration of the chain.
Take the free fall acceleration to be g = 9.80 m/s^2.


b. Find the force exerted by the top link on the middle link.


feel free to add me on your messenger list so that you can explain the problem step by step if it is difficult to do so on here. any free-body diagrams will help :) thanks a lot.

2007-02-11 19:48:44 · 5 answers · asked by Anonymous

In star trek, a machine called a replica is allegedly capable of rearrnaging matter to create new matter such as turning a clump of copper into food, water, air, or furniture.

Is such technology theoretically possible with Heisenberg's Uncertainty Principle?

2007-02-11 19:39:31 · 11 answers · asked by Anonymous

2007-02-11 19:37:14 · 2 answers · asked by prs1145 1

2007-02-11 19:14:37 · 1 answers · asked by parth 1

2007-02-11 19:11:50 · 11 answers · asked by evanjones e 1

The spring of a spring gun has force constant k = 400 N/m and negligible mass. The spring is compressed 6.00 cm and a ball with mass 0.0300 kg is placed in the horizontal barrel against the compressed spring. The spring is then released, and the ball is propelled out the barrel of the gun. The barrel is 6.00 cm long, so the ball leaves the barrel at the same point that it loses contact with the spring. The gun is held so the barrel is horizontal.

(a) Calculate the speed with which the ball leaves the barrel if you can ignore friction.

(b) Calculate the speed of the ball as it leaves the barrel if a constant resisting force of 6.00 N acts on the ball as it moves along the barrel

(c) For the situation in part (b), at what position along the barrel does the ball have the greatest speed? (In this case, the maximum speed does not occur at the end of the barrel.)

(d) What is that greatest speed?

2007-02-11 18:53:15 · 1 answers · asked by M 2

A thin, uniform 12.0-kg bar that is 2.00 m long rotates uniformly about a pivot at one end, making 5.00 complete revolutions every 3.00 seconds

What is the kinetic energy of this bar? (Hint: Different points in the bar have different speeds. Break the bar up into infinitesimal segments of mass dm and integrate to add up the kinetic energy of all these segments.)

2007-02-11 18:48:53 · 1 answers · asked by M 2

2007-02-11 18:43:46 · 17 answers · asked by Anonymous

2007-02-11 18:01:55 · 2 answers · asked by devanathan d 1

I'd particularly like some stock market tips.

2007-02-11 17:57:08 · 5 answers · asked by In Honor of Moja 4