Equator Definition and 102 Threads

I just saw a StarTalk video where Neil deGrasse Tyson says that gravity at the poles is lower than at the equator because, even though you are closer to the center, the mass around the equator outside the sphere below you somehow does not count (skip to 4:21 in the video). He is obviously wrong...

I am at the equator with a drone capable of 1000mph speeds and the ability to hover. If the sun (or another fixed point in space) was directly overhead and I waited for the earth to rotate 1000 miles then launched the drone and flew 1000mph against the earths spin till the sun was directly...

Hi. I just visited the equator in Ecuador, where they perform those fake water spin experiments on and a few meters north and south of the line. I know that the Coriolis effect is way too small on that scale, so how do they do it? They even let spectators pull the plug.

A 4D planet has no axis of rotation. Nothing special about planets, all freely rotating 4D bodies have two perpendicular planes of rigid rotation. (Clifford proved this in the 19th century.) Now there is nothing stopping us from thinking of planes of rotation here in 3D Universe. It's the...

We have a weekly fun random chat to break from the routine of WFH. A science quiz poped up. There is no consensus on the good answer. We need 3rd party opinion. You are at the equator, dropping a steel ball into a dry well, the depth is 100 meters, the mass of the ball is 1kg. The starting...

I have a question about the Coriolis acceleration experienced by a projectile launched from the surface of a rotating body. Say a ball is launched at 45 degree angle relative to the surface at some initial velocity v0. Let's further specify that the ball is launched due north from the equator...

Earth absorbs and releases a massive amount of energy as a part of the day night cycles.(~100 Peta watts of solar radiation received) And the temperature difference between the poles and equator drive weather phenomenon, which happens at an energy scale beyond technology. I am wondering if one...

The Earth's circumference at the equator is 24,901 miles, or 40.075 million meters. It rotates completely once a day or in 86400 seconds. The speed of sound is 343 m/s and the Earth moves at the equator at 40.075 million m/86400 s = 463.831019 m / s which is clearly faster than the speed of...

If we think about the forces acting on an object at the surface of the Earth, these forces would be the weight force (mg) pulling downwards and the normal force (N) acting upwards . If the Earth were to stop rotating, then according to Newton's first law the forces must balance, meaning the net...

Hi, I’ve got a question. it seems that engineers, structural mainly, don’t seem to understand how gravity works regarding an endless stationary (steel) ring/bridge around the equator. Many if not all have said that such a ring would be modeled as two half circles pushing into each other. So the...

Hurricanes tend not to move towards the Equator for very long, turning north fairly soon, and have never been known to reach it, I think. Likewise cyclones in the southern hemisphere, which turn south before reaching it. Why is this? I have two tentative explanations. 1. Hurricanes start out...

Earth rotate from west to east with 460m/s at equator. Car travel at equator from east to west at speed 460m/s. 1- What is car speed from inertial ref.frame? zero?How is zero if car travel in curved line? 2-What is car speed from rotational frame ? 3-How much is car weight,compare to car...

I recently realized that some of the most used Space Centers (for instance the Kennedy Space Center, Merritt Island, FL (US), by NASA, the Guiana Space Center ,French Guiana, by ESA and the Baikonur Space Center ,Kazakhstan's area leased to Russia, by Roscosmos) are relatively close to the...

1. The centripetal force is equal to F= mv^2/r. The velocity of the Earth can be found by: V=2πr/T T=1 day = 24 hr*60min*60sec=86400 s v=2π*6.4 x 10^6/86400 s v=465.4211 ... ~465 ms^-1 to 3.s.f Therefore, F=1*465/6.4 x 10^6 F=98/1280000=7.265626 *10^-5 ~7.3 *10^-5 N Would this be correct since...

The apparent ##|\vec{g}|## at the equator, away from Earth's axis of rotation is lower. I know how to calculate this difference of about ##0.03\ \frac{m}{s^2}##. However, I do not intuitively understand this. The closest I've come to an intuitive understanding: An object, whether it is on the...

I had the wonder of whether, due to the speed difference, clocks ran at a different speed on the equator than on the poles. I then researched this, and found that, due to being closer to the centre of the Earth at the poles due to the bulging of the Earth due to spinning, the two essentially...

Hello, I am looking to find out the energy (or power) content of the sunlight incident on the equatorial region during summer months. I assume, this is highest in that region. I actually want the direct energy content - not, say, the electrical output from a solar panel. This could be, in some...

Homework Statement A bead slides along a frictionless wire which lies in the N/S direction, midpoint at the equator. All points along the wire are the same distance from the center of the earth. The bead is initially at rest then released a small distance, δ, to the north of the equator...

Clocks in orbit are time dilated due to their orbital velocity. Do we measure a similar effect for clocks on the equator when measured against clocks at the poles?

The Earth rotates around its own axis within 24 hours. Theoretically, if at the equator perform a tower with a height - H, ignoring its effect on the slowdown of the Earth's rotation (we assume that the material of low density), objects and other complications, at a certain height, the linear...

Hi there Only known variables include the solar flux on the Earths atmosphere at the equator is 1.5 kWm^ -2. I've calculated the total energy from the Sun as 4 x 10^26 W, but can't seem to get to a calc of the mag of electric field at equator (measured in kVm^-2).

Is there an on-line calculator or a table that would allow me to plug in a date (year) which would give me the moon's inclination to the plane of the equator on that date? Thanks for any help.

I was pondering human evolution on different continents recently and some thoughts occurred to me: 1# the distance a region is from the equator determines the temperature of a climate all over the Earth 2# humans have probably been in regions of varying distances from the Equator long enough for...

Homework Statement What speed you have to run on the equator to weigh as much as possible (the greatest weight) if you do choose the right direction? Do not consider relativity. Homework Equations ravitational acceleration is 9.78 m/s2 at the equator and 9.83 m/s2 at the poles, so you weigh...

The sun's rotational period is 25 days at the equator. Given that the radius of the sun is 700,000 km, calculate the max velocity of approach or recession of the Sun's equator as viewed from Earth. Find the max change in wavelength of a spectral line due to the rotation and express it as a...

The bulge at the equator, which Wikipedia says is 42km, means that a point on the equator (at sea level) is 21 km further away from the centre of the Earth than the poles. That's two and a half Everests! I think that the difference in the force of gravity (gravity only) between the equator and...

on earth, we have the poles being very cold and mostly frozen, while the equator is very warm and humid. i would like to know specifically what causes this. i know it is partially because of their exposure to the sun, but i'd like to know some of the details and factors involved. i'd also like...

Homework Statement A fast sprinter with a mass of 80 kg runs across the equator. What is the value of the Coriolis force he experiences? Homework Equations F=ma a=2ωVradial ω=7.27 x10-5 rads-1 Earth rotates from west to east. The Attempt at a Solution I pick a direction of travel - South to...

Neglecting equatorial bulge and using 'g' (9.81m/s^2) as standard before calculations, I wanted to see if I could calculate the change in 'g' before looking it up. Obviously this not a difficult sort of problem but I am finding myself a tad confused about something. It seemed intuitive to me...

I think its a defination to have infinite longitudnal lines , if line are not perpendicular than the infinite point will not add up to give the circumferance of equator, please help

why does the normal on a mass have different values at pole and equator

Homework Statement A man that has an ordinarily weight of 780 N stands on a libra on the equator. Homework Equations What is the weight measured by the libra? The Attempt at a Solution I thought it was simple, so I just did: P = m * g Since it gives me P I can simply do: m = P / g = 780 /...

The pointed line is equator as well as perpendicular bisector.Right?

Homework Statement A satellite is in a circular equatorial orbit around the Earth (over the equator). If the satellite flies over Singapore 9 times a day, what is the radius of the orbit? Homework Equations r3 = T2GME/4π2 The Attempt at a Solution G = 6.67x10-11 ME = 5.97x1024 T =...

I know that radial force comes into the play but the direction of gravity (9.8) is also the same as radial acceleration so instead it should increase on equator

I read that a non rotating planet like Lubricon VI does not have equator because it does not rotate. So why only rotating planets have equator?

If one were to send two light beams around the equator east and west, would the Sagnac effect occur? I know Michelson-Gale-Pearson measured it, but in their experiment the two beams would each travel both directions in separate rectangles, so I wonder if the effect would be weaker/stronger. How...

If the axis of the Earth is tilted at 23.4 degrees away from the North Ecliptic Pole, and the Ecliptic Plane is tilted at 60.2 degrees away from the North Galactic Pole, then why is the Earth's rotational axis inclined at 27.13 degrees relative to the Galactic Equator instead of (90-(60.2+23.4))...

I'm trying to understand why a superdeformed nucleus may be represented as bulging perpendicular to the axis of rotation, and I'm guessing this is akin to why the Earth does so too. I've gone through secondary school and 3 years of University to have professors/teachers snigger every time they...

The question is: a conducting spherical shell of radius a rotates about the z axis with angular velocity ω, in a uniform magnetic field B= B_{0}\hat{z} . Find an expression for the EMF developed between: i) the north pole and the equator (2 marks); ii) the north pole and the south pole (1...

Hello, I need some help understanding this question. If we take a mass of a person as 100kg, what would he weigh at the poles and the equator, in Newtons? How do I do this please? Thanks and much appreciate some help.

Homework Statement You stand on a spring scale at the norh pole and again at the equator. Which scale reading will be lower, and by what percent will it be lower than the higher reading? Assume g has the same value at pole and equator. I have no need for the answer to this question but...

I get that they have to be at the same position relative to the earth but why is it that they have to be specifically above the equator? thats the sense I get from the textbooks, they all seem to emphasize the satellite being above the Equator can't you have a geosynchronous satellite...

Homework Statement 23) A person weighs less at the equator than at the poles. The main reason for this has to do with A) the spin of the Earth. B) the shape of the Earth. C) both the spin of the Earth and the shape of the Earth. D) the influence of the sun, moon, and all the planets...

Suppose it's the equinox, when the Earth's closest point to the sun is the equator. Would people who live somewhere along the equator see the sun rise directly from the east, move directly above so, and set directly to the west? For instance, if someone, living on the equator, were to put a...

Ok forgetting everything about how Earth is not a perfect sphere, the greatest centripetal acceleration is at the equator. So if you say N - Mg = -Mac, N should equal M(g-ac) which gives a weaker force than the gravitational force. If the net force is a force towards the center of earth...

Assume there's a person standing at the pole of the earth. When the Earth rotates, he/she has no tangential velocity because the person is at the pole. Now if the person were to take a trip by plane and land at the equator, the person would now have a fairly large velocity because the...

Homework Statement Earth rotates in on axis that goes through both the North and South Poles. It makes one complete revolution in 24 hours. If the distance from the axis to any location on the equator is 3960 miles, find the linear speed (in miles per hour) of a location on the equator...

Homework Statement Homework Equations F→scale + F→g = ma That's my guess. The Attempt at a Solution Well, I'm reading it in the book. It's an example with the answer that the scale reading will be less than my weight. But I still don't understand how that works out to be...

Hi, Due to Earth's axial tilt, the Sun's annual motion is along the ecliptic that is tilted to Earth's celestial equator. When the Sun crosses the equator at both equinoxes or solstices, the Sun's daily shift is at an angle to the equator, so we have to do the projection of this shift onto...