Physics - March 2007

What is the force of gravity between Earth and the moon if the Moon's mass is 0.013 times that of Earth?
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2007-03-19 15:15:18 · 2 answers · asked by ogunro a 2

A force parallel to the x-axis acts on a particle moving along the x-axis. This force produces a potential energy U(x) given by U(x)= (1.14J/m^4)x^4.

What is the force (magnitude and direction) when the particle is at position x= -0.570m?

2007-03-19 15:02:18 · 3 answers · asked by ♡♥EM♡♥ 4

2007-03-19 15:01:52 · 3 answers · asked by Anonymous

2007-03-19 14:55:59 · 4 answers · asked by Anonymous

In other words, is gravity faster than the speed of light?

2007-03-19 14:53:56 · 6 answers · asked by somerslats 2

2007-03-19 14:46:25 · 4 answers · asked by Thomas 2

a)temperature
b)bouyant force
c)mass
d)weight
e)all of these

2007-03-19 14:44:00 · 4 answers · asked by cesar i 1

a)more than 10.3m
b)10.3m
c)less than 10.3m

2007-03-19 14:37:08 · 1 answers · asked by cesar i 1

Thanks.

2007-03-19 14:29:08 · 1 answers · asked by Anonymous

A 72 kg soccer player jumps vertically upwards and heads the 0.45 kg ball as it is descending vertically with a speed of 24 m/s. If the player was moving upward with a speed of 4.0 m/s just before impact, what will be the speed of the ball immediately after the collision if the ball rebounds vertically upwards and the collision is elastic?
____ m/s

If the ball is in contact with the player's head for 20 ms, what is the average acceleration of the ball? (Note that the force of gravity may be ignored during the brief collision time.)
____ m/s2

Thank you so much! I only have a couple more hours to work on this and this was a problem that a group of students from my class could not find out.

2007-03-19 14:27:55 · 2 answers · asked by Anonymous

2007-03-19 14:25:21 · 2 answers · asked by Star Wars Fan 1

2007-03-19 14:23:35 · 2 answers · asked by Anonymous

2007-03-19 14:20:54 · 5 answers · asked by shaelynn o 2

sunrise, sunset, reflection in puddle,
need more ideas please

2007-03-19 14:12:14 · 6 answers · asked by you're_a_mango 2

A bullet with mass 4.66 g is fired horizontally into a 1.929 kg block attached to a horizontal spring. The spring has a constant 6.34 102 N/m and reaches a maximum compression of 6.38 cm.
(a) Find the initial speed of the bullet-block system.
vi = m/s

(b) Find the speed of the bullet.
vbullet = m/s

I would really appreciate it if someone could please help me with this problem. I have been stuck on it for a while and I have asked several classmates as well, which are also stuck. Thank you so much in advance!

2007-03-19 13:38:45 · 3 answers · asked by Anonymous

A mass is swung on a string of length L. The mass makes one revolution in T seconds. Calculate the angle (theta) that the string makes with the vertical, in terms of g, L, and T.

2007-03-19 13:37:54 · 1 answers · asked by Anonymous

A 2.2 times 10 to the negative 9 C charge is on the x axis at x= -1.5m and a 5.4 times 10 to the negative 9 C charge is on the x axis x=2m. Find the net force exerted on a 3.5 times 10 to the negative 9 C charge located at the origin.

2007-03-19 13:16:05 · 3 answers · asked by Kitana 2

so sound is made by vibrations, then why is it that when we wave our hands, we can not hear anything? the air is also disturbed by our hand. What's going on?

2007-03-19 13:10:05 · 2 answers · asked by Ha!! 2

this is important and due thursday so help me

2007-03-19 13:06:21 · 5 answers · asked by cali gurl 1

Say someone has X amount of energy he/she wants to convert into mass, say, a group of atoms. How does one go about this conversion? Does simply compressing the energy do the job? Is mass simply more localized and compressed energy? i.e., "energy with structure"?

Also, since light is supposed to be massless yet contains energy, how can one change photons of light into energy?

2007-03-19 13:00:59 · 10 answers · asked by sassychickensuckerboy 4

If black holes(or the energies at work around them) can be utilized for time travel in one diretion, could a anti black hole be used for time travel in the opposite direction? What do you place the odds at?

2007-03-19 12:59:27 · 3 answers · asked by Packer Smacker 4

If you have 10kg shopping bag in your hand and stuck in a bus queue standing still, you still get tired doing zero work according to physics. What is going on?

2007-03-19 12:56:58 · 4 answers · asked by East Ender 2

Suppose 15 boxcars pass by in a time of 15.0 s and each has a length of 14.0 m.

2007-03-19 12:54:39 · 2 answers · asked by Anonymous

Given the incredible forces at work within and around a black hole could this energy be utlized to accomplish time travel?

2007-03-19 12:53:38 · 6 answers · asked by Packer Smacker 4

2007-03-19 12:47:19 · 6 answers · asked by lilnannik 1

A 0.145 kg baseball pitched at 37.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is 1.00 10-3 s, calculate the average force between the ball and bat during contact.
N

I don't know what to do with the two speeds.

2007-03-19 12:44:53 · 2 answers · asked by beast 1

A fire engine has sirens of 500 Hz. What frequency is heard from a stationary observer A) when the engine moves towards her at 12m/s. B) when it moves away from her at 12m/s. (speed of sound is 343m/s).

2007-03-19 12:44:20 · 2 answers · asked by Tennis2127 2

I want to try something. I would like to take a large object, say a bowling ball, and see if I can take a much smaller object, say a ball from a pen, and put the pen ball in orbit around the bowling ball. Has anyone tried this with the earth's gravation in the equation?

2007-03-19 12:39:37 · 2 answers · asked by alanone88 1

Consider a child holding a helium balloon in a closed car at rest. What would the child observe in the car if a) accelerates from rest and b) breaks from a stop? (the ballon does not touch the roof of the car.)

2007-03-19 12:39:07 · 2 answers · asked by Anonymous

The Earth has mass m=5.93 X 10^24 kg and radius r=6.38 X 10^6 m. A satelitte in a geosynchronous orbit will stay above the same point on the Earth, since the period of the orbit is the same as the period of the Earth's rotation. What is the altitude for geosynchronous orbits? You will need to use the formula

F= G x M1 x M2 / r^2

to calculate the gravitational force on the satellite.

____________

So that is the question, I just need to know what to solve for, I should be able figure out the equations to use and whatnot. Thanks.

2007-03-19 12:37:17 · 4 answers · asked by Anonymous