Why do we use cos theta in physics?

The Cos Theta Formula is especially useful when working with right-angled triangles. In a right triangle, the Cosine of an angle will always be the length of the adjacent side divided by the length of the hypotenuse. Why do we use sin and cos in physics? Sine and cosine — a.k.a., sin(θ) and cos(θ) — … Read more

What causes Earth’s orbit to move from circular to elliptical?

Why not circular? Orbits are eliptical because of Newtons Law of Gravity (bodies attract each other in proportion to their mass and inversly proportional to the square of the distance between them). All worked out by Kepler some years ago. What would have happened if the Earth’s orbit was circular instead of elliptical? If Earth’s … Read more

What is the moment of inertia for a disk?

Thus the moment of inertia of a disc about any of its diameter is MR2/4. How do you find the moment of inertia of a disk with a hole in it? What is the moment of inertia of disc and ring? The total moment of inertia of the disk is obtained by adding together the … Read more

What is upstream downstream problem?

Downstream/Upstream: In water, the direction along the stream is called downstream. And, the direction against the stream is called upstream. If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr. How do you calculate upstream and … Read more

How does a swing work physics?

Swings work by converting potential energy into kinetic energy, then kinetic energy back into potential energy, over and over again. The kinetic energy is the fast part of swinging; it’s the speed you have as you rush back and forth. Potential energy is the high part of swinging. What are the forces acting on a … Read more

How do you find velocity with position and time in physics?

Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation v = Δs/Δt. How do you find final position with velocity and time? Work out which of the displacement (S), initial velocity (U), acceleration (A) and time (T) you have to … Read more

What are the principles of Newton’s laws?

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction. What … Read more

What is the principle of conservation in physics?

conservation law, also called law of conservation, in physics, a principle that states that a certain physical property (i.e., a measurable quantity) does not change in the course of time within an isolated physical system. What are the principles of conservation of energy? The principle of energy conservation states that energy is neither created nor … Read more

What does electric field strength depend on?

The electric field strength is dependent upon the quantity of charge on the source charge (Q) and the distance of separation (d) from the source charge. At which point is the electric field strongest? The field is strongest where the lines are most closely spaced. The electric field lines converge toward charge 1 and away … Read more

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