09/08/19

Physic Question Help
Use Gauss's Law to find the electric field inside and outside a uniformly charged spherical shell of radius R and surface charge density σ.
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08/08/19

Question from my assignment
Two plane glass plates are placed on top of one another and on side a paper is introduced to form a thin wedge of air. assuming that a beam of wavelength 600 nm is incident normally, and that there... more
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08/03/19

What role does static friction force play for a rolling object? How can I know what direction it points?
Fundamentally, what does a friction force do for a rolling object? I am very confused by the way my textbook explains it. In my textbook , it says: A wheel rolling on a horizontal flat surface at... more
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08/02/19

Why don't we consider jerk in physics classes?
When I got more into physics, I started asking myself if just like acceleration represents the growth of speed, something else could also represent the growth of acceleration itself. And it came... more
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08/01/19

What is force? How does a constant force output a nonconstant power?
For a constant force, P=Fv. I understand the mathematical derivation of this, but this seems to me, intuitively, to be nonsense. I feel that my discomfort with this comes from a fundamental... more
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08/01/19

Why is a book on a table not an example of Newton's third law?
My textbook explains Newton's Third Law like this: > If an object A exterts a force on object B, then object B exerts an equal but opposite force on object A It then says: > Newton's 3rd... more
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08/01/19

Why does Newton's third law exist even in non-inertial reference frames?
While reviewing Newton's laws of motion I came across the statement which says Newton's laws exist only in inertial reference frames except the third one. Why is it like that?
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08/01/19

What is convection?
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07/31/19

Where am I confused about force addition?
As far as my knowledge is concerned, a vector quantity should possess magnitude and direction & more over it should also obey the laws of vector addition. As we all know that the vector sum of... more
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07/31/19

What is the basic reason behind buoyancy?
Yesterday my friends and I were solving this easy-looking question: > A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in... more
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07/31/19

What is the difference between centripetal acceleration and centrifugal force?
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07/31/19

Work done by the Magnetic Force?
The magnetic part of the Lorentz force acts perpendicular to the charge's velocity, and consequently does zero work on it. Can we extrapolate this statement to say that such a nature of the force... more
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07/30/19

Why does a car engine not do work if the wheels don't slip?
I saw this mind boggling result that if the tires don't slip then the work done by an engine to move a car is zero. Why is this true? Moreover, what does this truly mean? **Update:** Sorry about... more
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07/30/19

When is tension constant in a rope?
Suppose we have a massless rope with pulling forces applied at each end. In which scenarios is the tension in the rope constant throughout? For example if there is a knot in the rope the tension is... more
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07/30/19

What does it mean that electrons are ejected or come off a surface for the photoelectric effect?
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07/30/19

Which force is responsible for victory in tug of war?
I'm confused: In a tug of war game on rough ground who will win? The one who applies greater force on the rope or the one who applies greater force on ground?
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07/30/19

Why don't black holes form from forces other than gravity?
Gravity is the weakest of the fundamental forces, so what is so special about gravity that it can form an inescapably strong field while a force like the EM force cannot? It seems to me that if... more
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07/30/19

What did Einstein mean by the statement, "All laws of Physics remain invariant in all inertial frames of reference"?
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07/30/19

Understanding the trajectory of a projectile?
It is stated that a projectile's motion can be divided into individual vectors. Now according to the laws of physics, the forces acting in the y-direction will never cancel or affect the force... more
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07/30/19

Rope tension question?
If two ends of a rope are pulled with forces of equal magnitude and opposite direction, the tension at the center of the rope must be zero. True or false? The answer is false. I chose true though... more
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07/29/19

What is the cause of the normal force?
I've been wondering, what causes the normal force to exist? In class the teacher never actually explains it, he just says "It has to be there because something has to counter gravity." While I... more
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07/22/19

Free falling body
A stone is dropped from the top of the tower 300m high and at the same time another stone is projected vertically upwards with initial velocity 75ms‾1Calculate when and where the two stone met.
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07/21/19

The intensity of a sound
Given that I0 = 10-12 watts/meter2, what is the intensity of a sound for which the decibel level of the sound measures 136? Round off your answer to three decimal places. ? Watts/meter2
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07/21/19

Has a body angular momentum and torque only in a circular path?
In different contexts, my book(**Principles of Physics** by Resnick, Halliday ,Walker) , they wrote > For torque, the path need no longer be a circle and we must write the torque as a vector... more
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07/17/19

Do two springs compressed springs placed against each other obey Newton's third law?
I've been mulling over the following scenario. Say I take two springs whose force is given by some well-defined function of position (for example, Hooke's law F=kx will do). Using this law, I... more
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