All Questions
28
questions
1
vote
0
answers
22
views
Centre of Gravity of Earth-Moon Elevator [closed]
Suppose you have a cylindrical elevator that resembles a rod of mass $m$, cross-sectional area $A$ and uniform density $\rho$, with a length $L$ spanning the distance between the Earth and the Moon. ...
- 119
0
votes
1
answer
53
views
At which colatitude $\theta$ is the error between $\vec g_{eff}$ and $\vec g$ maximum? [closed]
Suppose a plumb bob hangs without swinging, then the string defines the
effective direction of gravity. Suppose you are holding the bob on the surface of the
earth at colatitude $\theta$, where $\...
- 111
0
votes
2
answers
171
views
Would a body have any residual velocity if launched at escape velocity from the Earth's surface?
A body is lanuched at escape velocity from the Earth's surface i.e 11.2 km/s ,what would be it's velocity outside the Earth's gravitational field?
I guess it would be zero but there's another problem ...
- 41
-2
votes
1
answer
140
views
How high can you jump (at the corner) on Cube-Earth?
I have read this question:
Is the force of gravity always directed towards the center of mass?
And G. Smith's answer lists a site where they specifically talk about this case mathematically.
https:/...
- 29k
0
votes
4
answers
7k
views
What is acceleration due to gravity at the centre of the earth? [duplicate]
When I asked my teacher that what is the acceleration at the centre of earth, he replied that it is 0 as when we move inside the earth, the effective mass decreases i.e. the mass that exerts ...
- 592
2
votes
1
answer
1k
views
Using energy method to solve SHM of an object through a tunnel dug through the Earth [closed]
I want to figure out the time period when an object performs simple harmonic motion by passing through a hole through the Earth.
Let the mass of Earth be $M_0$. Therefore, mass of Earth at radius $r$ ...
- 366
2
votes
1
answer
88
views
Constant of integration in Equilibrium Theory of Tides
I am preparing an elementary derivation of Newton/Laplace's equilibrium theory of tides.
The derivation of the tractive force is understood, as is the derivation of the differential equation for ...
0
votes
1
answer
258
views
Will a projectile fired straight up from the equator land at the same spot on the ground ignoring wind? [duplicate]
Suppose a bullet were to be fired with a velocity $v$ from the surface at equator. Considering the spin of Earth will it land at the same spot?
I tried to solve this assuming constant acceleration ...
- 11
1
vote
2
answers
2k
views
How to arrive to / calculate gravitational acceleration on Earth?
What are the exact steps and figures to calculate gravitational acceleration on Earth (9.8 m/s^2) and where do these figures come from?
(Please use an algebraic explanation, but assume understanding ...
- 161
-1
votes
2
answers
393
views
Can we feel weightless if Earth's angular velocity is big enough? [duplicate]
According to Fn=Fg-Fc , if earth's angular velocity is big enough to make Fc equal to Fg, would we feel weightless?
I did some basic calculation earth has to rotate at 1 rev/5064s at equator for Fc to ...
4
votes
2
answers
296
views
How much mass must Earth lose to lose its Moon?
Maybe I am wrong about the basic concept here, but for my curiosity: how much mass would need to leave the Earth (like satellites and rockets) to create an imbalance between the Earth and Moon so that ...
- 215
1
vote
2
answers
417
views
Proportional acceleration due to changing density of the Earth
My question has to to do with a recent video Minutephysics posted about the time it takes for a person to fall through the earth, found here
http://www.youtube.com/watch?v=urQCmMiHKQk
At around 4:05,...
- 11
1
vote
0
answers
27
views
Rotation of earth and effect on $g$ [duplicate]
How do we calculate the change in the acceleration due to gravity (consider earth as a uniform sphere) with a change in the rotation speed of earth along its axis?
How do we build up a mathematical ...
- 11
4
votes
3
answers
2k
views
Are we increasing the gravity of Earth with our population?
I have these questions related to my question title:
Do we, other species and things have our own gravity?
How much Gs a human have?
Are we effecting Earth, nearby moons and planets with our gravity?
- 291
0
votes
4
answers
250
views
Does not the mass of those living on the Earth add on to the mass of the Earth or is it too negligible to be cared for?
Source: Earth weighs about 13,170,000,000,000,000,000,000,000 pounds (or
5,974,000,000,000,000,000,000,000 kilograms). Since Earth is too big
to be placed on a scale, scientists use mathematics ...
- 669