Recent content by Priyo137

I have been taught topics in high school circling around Newtonian mechanics and some basics of work and energy, waves, geometric optics, current and circuits and some poor electrostatics and unclear concepts of modern physics. I realize that I have significant weak areas in Physics and I aim...

I assume I shouldn't have used 5 significant digits. Maybe I should have kept 1 only, I'm not sure. It would be great if you helped. Thanks in advance.

Unfortunately, it's hard for me to approximate. All I can guess that it's going to significantly change if we're taking real data of the account. The major change will be causes probably for the assumption that Earth has a constant density. So you see, I can't exactly insist on how many...

Yes, sure. We have already got, $$KE=\frac{3GMm}{2R}$$ Let the escape velocity from the centre be ##v_{ec}##, so we can write, $$\frac{1}{2}mv^2_{ec} = \frac{3GMm}{2R}$$ Through algebraic manipulations and substituting the value of ##g = \frac{GM}{R^2}## at Earth's surface (just to make...

Thanks for welcoming me here! It's a question from a very recent physics exam at my high school.

I have quite a basic idea of the two. It turned out to me that if we could know the energy required to bring the object to the surface of the Earth (by maybe using the concept of Gravitational potential energy), it can be solved.

I am looking for the second one, assuming a thin tunnel from the center to the surface. Further assuming that it does not necessarily change the distribution of mass of the spherical Earth severely.

What is the minimum velocity (theoretically) of an object located at the CENTER of the Earth to move it outside its gravitational field?

As a physics enthusiast high-school student, I often run into troubles engaging with physics problems. In PF, I am going to seek a place for physics discussions. Thanks.