Gravitational force Definition and 488 Threads

A bowling ball (mass=7.2 kg, radius=0.11m_ and a billiard ball (mass=.38kg, radius= .082m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational force that each can exert on the other? I figured I was supposed to use F=Gm1m2/r^2 but I didn't know how to...

I was working on some gravitational force problems, and this one was particularly challenging to me: "Two particles are located on the x axis. Particle 1 has a mass m and is at the origin. Particle 2 has a mass 2m and is at x=+L. Where on the x-axis should a third particle be located so that...

Here reads the problem. the equator, near the surface of the Earth, the magnetic field is approximately 50.0 µT northward, and the electric field is about 100 N/C downward in fair weather. Find the gravitational, electric, and magnetic forces on an electron in this environment, assuming the...

This question was asked by a Std 9 student, and has me foxed. Since the Earth is so much more massive than the moon, and its centre much closer to the surface, isn't the Earth's pull on the water much stronger than the moon's? Then how is it that the moon can cause Earth's water to rise to...

When lift up the box to 2m forward. Find out the work done by the gravitational force. I find it by W = mg (x) But my lecturer encourage me to do it in this way: W = 2mgsin(a), and told me that my method is correct in trigonometric but not really correct in physics. I would like to know...

A satellite of mass 1900 kg used in a cellular telephone network is in a circular orbit at a height of 690 km above the surface of the earth. What is the gravitational force on the satellite? Take the gravitational constant to be G = 6.67×10−11 N*m^2/kg^2, the mass of the Earth to be m_e =...

This is the last question I have on my study guide that I can't solve. My physics test is tomorrow and I just want to be ready for it. Please help me figure this one out! What is the gravitation force on mass 1 if each mass is 2 kg? O<---(5m)---->O mass3 I...

Hi; Could someone please help me with this question: An electron (m= 9.11E-31 kg) is accelerated in the uniform field E (E= 1.45 x 10^4 N/C) b/w two parallel charged plates. The separation of the plates is 1.10cm. The electron is accelerated from rest near the negative plate and passes...

the question is http://home.earthlink.net/~urban-xrisis/phy002.jpg I thought that... F=G\frac{m_1m}{R_1^2}-G\frac{m_2m}{R_2^2} a. F=G\frac{m_1m}{a^2}-G\frac{m_2m}{(R_2-a)^2} b. F=G\frac{m_1m}{b^2}-G\frac{m_2m}{(R_2-b)^2} c. F=G\frac{m_1m}{c^2}+G\frac{m_2m}{c^2} is this correct?

In introductory physics laboratories, a typical Cavendish balance for measuring the gravita- tional constant G uses lead spheres of masses 1.8 kg and 13.9 g whose centers are separated by 5.77 cm. Calculate the gravitational force between these spheres, treating each as a point mass...

hey...heres a question that's been bugging me "The Earth and the moon attract each other with a gravitational force. How does the force acting on the more massive Earth compare to the force acting on the moon?" Choices: a.) there is a greater force acting on the earth. b.)the same force is...

Suppose that electrical attraction, rather than gravity, were responsible for holding the MOon in orbit around the Earth. If equal and opposite charges Q were placed on the Earth and the Moon, what should be the value of Q to maintain the present orbit? Given these data: Moon = 7.35 \ast...

i have a couple questions to ask 1: When a satellite is in eclipsical orbit, the total energy should stay the same wether it is at Perigee or Apogee, neglicting friction, correct? 2: Which is larger - The total energy of the 2.00kg satellite in its 160km orbit or the total energy is its...

Hey all, I am stuck on this problem. A spaceship is ona straight line path between Earth and its mon. At what distance from Earth is the net gravitational force on the spaceship zero? Well, when I try to use the Universal law of gravitation. F=G(m1)(m2)/r^2, I could find the...

It seems to me that I've got part (a) right, but I'm not so sure about what I have in part (b). I just need to know whether or not I am on the right direction. Any help is highly appreciated. :smile: Problem The force due to gravity on an object with mass m at a height h above the surface...

Here is a problem, please let me know whether my answer is right or wrong. Locate the position of a spaceship on the Earth-Moon center line such that the tug of each celestial body exerts on it would cancel and the craft would literally be weightless. I found two equations: A...

Three identical masses of 650 kg each are placed on the x-axis. One mass is at -13.0 cm, one is at the origin, and one is at 42.0 cm. What is the magnitude of the net gravitational force on the mass at the origin, due to the other two masses? I solved this problem in the homeowrk section of...

I am currently in a High School Physics class... i am completely lost with what we are doing, if anyone is really good at physics and has msn messenger please add me at ameriland_06@Hotmail.com If you don't have messenger if you could just e-mail me... here are some of the questions i have...

I can not figure out what I am doing wrong for this problem. Right now I have Wt = 60*.3*cos(50) = 12 J. If that is taken away, then it should be a 12 J difference right? In Figure 7-33, a block of ice slides down a frictionless ramp at angle = 50°, while an ice worker pulls up the ramp (via...

One problem 1.) Two bowling balls each have a mass of 15.8 kg. They are located next to one another with their centers 1.8 cm apart. What gravitational force do they exert on each other? (Use G = 6.670 10-11 N · m 2/kg2.)

I thought I did this problem correctly but when I submit my answer it says other wise. Here is the problem: The mass of a robot is 5440kg. This robot weighs 3610N more on planet A than it does on planet B. Both planets have the same radius of 1.33 * 10^7m. What is the difference M_{A} - M_{B}...

A rock of mass 33 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 239 N. What is the magnitude of the acceleration of the rock? ? m/s2

Please help me with the following problems! Four 9.5 kg spheres are located at the corners of a squareof side .60m. calculate the magnitude and direction fo the total gravitational force exerted on one sphere by the other three. *I think I'm supposed to use the forumula : F= G(m1)(m2)/r^2...

To be more exact, does gravitation have a force similar to the other basic forces: electromagnetic, strong and weak force? These other three are explained by the exchange of certain particles, but gravitation is explained by curving the spacetime. It doesn't look quite same to me... :confused:

I am sure most here are familiar with it Fg = G*m1*m2/d^2 With this formula, if one were to venture to the centre of the earth, the distance between he and the centre of the Earth == 0. Therefore we get the bottom equal to 0^2 or 0. If we then continue we get an undefined answer. Certainly...

I really need help with this question. I've been trying to figure it out for a couple of hours. Find the altitudes above the Earth's surface where Earth's gravitational field strength would be (a) five-sixths and (b) one-sixth of its value at the surface. These units have to be in km...

F = ma + mvxw where: F=force, m=mass, a=static gravitational field, v=velocity of mass 'current', x=cross product, w=angular velocity of rotating mass. To confirm: Follow Maxwell's derivation for electromagnetic equations, but rather than initiating with F=qE as the static manefestation...

(Sorry, I'm testing with the 'tex' code) Reverse Gravitational Force is the opposite force of Gravity. It is it that keeps two bodies from not moving EXACTLY into the areas given by F=\frac {G_m_1_m_2} {r^2}... You can test it by using EXTREMELY precise instruments, and checking if an...

If a particle has a wavelength greater than twice the scwarzschild radius will it be unlikely to get into the black hole, just as a long wavelength photon isn't likely to get through a narrow slit? If this is true there is a possible explanation for the weakness of the gravitational force...

hello everybody: A satellite of mass m used in a cellular telephone network is in a circular orbit at a height of h above the surface of the earth. What is the gravitational force on the satellite? Take the gravitational constant to be G , the mass of the Earth to be m_e , and the radius...

Can someone help me with these two questions: a. Imagine two spherical planets fixed on the x-axis, one with mass M at the origin, and the other with identical mass M at the position x = +100.0 units. At what position along the x-axis between the two masses could you position yourself so that...

In a system with two masses M and m, separated by distance d, is there only one force GMm/d^2 pulling them together, or are there two forces, one exerted by M on m, and one exerted by m on M? If there is only one force, then the relative acceleration of these two objects would only depend on...

i am given a problem where a satellite in orbit is a certain distance from the surface of the earth. It then gives the radius of the earth. I realize i have to use the forumula: Fg=(Gm1*m2)/R^2 can i just use the distance from the surface of Earth to the satellite as R or do i add the radius...

|---------------------| s = ct The amount of motion p of the smallest particles moving in circles might or might not be mc/(2(pi)) = mv and thereby v = c/(2(pi)) (the average value anyway, the acceleration is constant.) since: v0/(1 - (v/c)2)½ = v1/(1 - (v/c)2)½ we know...

Problem 15. Given: G=6.673*10^-11 N*m^2/kg^2. If the gavitational force between the electron(9.61*10^-31kg) and the proton (1.59*10^-27kg)in a hydrogen atom is 1.2*10^-47 N,how far apart are the two particles? Answer in units of m. Note: I got 9.197872041*10^-11 by r =...

I know that as things "fall" towards each other, they lose potential energy, that's fine. What I want to know is when a photon falls towards a mass does the photon also lose potential energy? I would assume so because potons have an equivalent mass. From the equation E = hf, can I therefore...

What is gravitational forces' and electromagnetic forces' energy source?Don't they violate conservation of energy?

Given that light can be pulled in by a large gravitational force, what would stop light being pulled by the gravitational force of a galaxy or group of galaxies or another gravitational body and being pulled into an orbit? Raavin :wink: