Recent content by thiotimoline

Hi there, The way I will interprete is that at the top of the loop, it is very much the minimum velocity required for you to be suspended just by g acting downwards only. Any other forces, be it normal contact force or centripetal force, is there to prevent you from flying off the loop only.

I think you're half-right to say the equation could have been F=kma. However, since the every object of mass m has a different characteristic eg. density, surface area, perhaps Newoton believed that k is already considered within m and thus decided to remove k as a redundant property?

Take water and air for example. The speed of sound is faster in water than in air because the particles responsible for transmitting the sound energy from point to point is closer to each other. Therefore it's partially correct to say that increasing density of a material will increase the speed...

You can draw a diagram showing 3 states - initial, falling and final. In the initial state, the object has maximum PE and zero KE since it's stationary. When it's in the falling state, maximum PE is slowly being converted into some KE. In the final state, assume the object stops upon hitting the...

Airline industry is in danger of facing extinction just based on your question :)

Can consider that the paper clip DOES have some electrical charge, just that the net charge between the paper clip and the environment is zero.

Best solution is to make a diagram out of it and show all the vertical and horizontal components of the rocket at different points of time, then apply relevant formulas. :)

The formula for gravitation is F=GMm/R^2. Some people may prefer to rewrite it as F=GM1M2/R^2. Just need to take note that M1 or M is the primary mass and M2 or m is the secondary mass. In this question, the mass of Sun is taken to be M1 or M. Data used: Gravitational constant = 6.67x 10^-11...

This is the correct ans, kindly ignore my previous post. I apologise for the mistake. :)

Data I used: Mass of Earth = 6.02 x 10^24 kg = Me Mass of Moon = 7.34 x 10^22 kg = Mm Let R = distance between Earth and station, r =distance between Moon and station At equilibrium, Force acting on station by Earth = Force acting on station by Moon GMeM / R^2 = GMmM / r^2 r / R =...

I have another question regarding black holes. Before stars collapse, they undergo supernova, which means the envelope or outer layer blows up. Will the total mass of the star decrease such that instead of being a black hole, at the very last minute it becomes a dwarf?

Hi to all, I have a quantum question to post here. In the discussion on atomic theory, we know that electrons in different orbital levels have different quantum energy, say n=1 and n=2 have different energy levels. When one electron 'jumps' to another energy level, say from n=2 to n=1, the...

Energy is like a universal property to show the amount of mass in a body, in relation to c^2, thus E=mc^2. In order to explain the warping of spacetime, it's necessary to use m instead of E. It's just like using the particile theory instead of wave theory to explain photoelectric effect. In...

If blue light comes to our eyes, we see it as blue colour. But since black means absence of light, no light reaches us, then can we still say black is a colour? In addition, what's the wavelength of black? Within the visible light spectrum of 400nm and 700nm?

How much the golf ball rebounces has to depend on the type of surface it hits. For hard surfaces, sound produced means a loss of energy, thus the final energy of the rebouncing golf ball is small than its initial energy and it rebounces to a smaller height compared to its initial height. For...