Earth stays in orbit as the mutual gravitational forces between it and the sun balance out. During solar eclipse, when the moon comes in between the earth and sun, should not that have an influence on the gravitational forces between earth and sun so as to either deflect the orbit of the earth or cause the moon to be pulled either toward the sun or the earth. But neither of that happens. Why is it so?4 AnswersAstronomy & Space4 months ago
We know here on earth that any object which has mass exerts a weight on the surface it is resting and the surface in turn counterbalances it with a normal reaction such that the object remains in equilibrium. Why doesn't the same hold true for big size objects like planets. Can't earth be thought of an object resting on space which is the surface. Shouldn't there be a normal reaction coming from space to counterbalance the weight of the earth. But we know that space does not contain any tangible matter to generate normal reaction. How come then the earth stays in equilibrium?3 AnswersPhysics4 months ago
The generally know concept in Physics is that the potential difference between two points causes electrons to flow from one point to the other point thus giving rise to electric current (assuming the set up is a battery which has the positive and the negative terminal connected by wire in the form of a loop).
But what exactly causes the electrons to flow - is it the excess of protons at the positive terminal that causes electrons to move towards them from the negative terminal or is it due to the deficiency of electrons at the positive terminal?
Also if both ends of the battery were positively charged shouldn't the electrons still flow giving rise to electric current as there would still be electrons in the wire that would be attracted to both the positive ends of the battery terminal?Physics4 months ago
A tall man and a short man are standing at a distance D mts from an observer P such
that they form an isoceles triangle. Their respective heights are T mts and S mts. At
what further distance from P should the tall man stand so as to appear the same height as the
short man.2 AnswersMathematics5 years ago