The point about the meaning of limx→a is that x can approach as close as you like in value to a but it can never equal a. As a result, the difference between the value of the function at x=a whose limit is being determined and the value of the function at a value of x exceptionally close to a is...
Work is the product of the applied force magnitude x the magnitude of the displacement (D) in the same direction as the applied force. As a result, this is sometimes expressed as W = F x Dcosθ where θ is the angle between the two vectors (F and D). Since the F and D vectors are always...
Do we remember christian0710's original question?
Yes, your original statement about the definition of 1 Newton and acceleration is correct BUT remember, the force applied refers to an unbalanced force. So there is no friction or other force opposing the motion in your original statement.
So, be...
Ehild: "Imagine you let a ball of 1kg fall by 1 m. The force of gravity is 9,8 N. It does 9.8 J work.
Now you hold the same ball and move downward very slowly by 1 m. The ball moves with constant velocity, which means your force balances gravity. The force of gravity is the same as before, and...
Point 1:
Remember, potential at a point (measured in volts) is the electrical potential energy of 1 coulomb of charge at that point. That is why 1 volt is defined as 1 joule of energy per coulomb.
If this charge flows through a circuit to another point and let's say through a lamp, then the...
The semantics in this thread is confusing. Instead of talking "voltage" everywhere, let's talk about electric potential (V) (measured in volts or joules per coulomb) and potential difference (deltaV).
For a current to flow from point A to point B, there must be a potentil difference between the...
I don't know where you got the value for Planck's constant but it is not correct. The accepted value is 6.62606957 × 10−34 joule∙second. Use 6.626x10-34 and your calculated DeB λ will be much smaller.
I need more information.
At first glance, this slightly blurry photo suggests your rock is a piece of tar filled with fine gravel.
How hard is this sample? (Can you scratch it with a knife?, with your finger nail?, etc.)
How dense is it? Does it feel like it might be metal?
Does it respond...
ΔZHermes: Force has units based on mass, distance and time squared. Not what you said.
Your equation: ma = Δ(mv) is incorrect.
It should read ma = m(Δv/Δt).
johann1301: Δ(mv) is more commonly and correctly written as mΔv and means change in momentum.
To start changing mass by...
Bigfooted and Alex,
I have several concerns about your explanations
a) Weight is the DOWNWARD force exerted by gravity on a mass. It is never an upward force.
b) Weight never changes unless the mass changes or the FORCE of gravity on the mass changes.
c) When standing on a bathroom...
One is always in danger when referring to centrifugal force as an action. It is a reaction force and is exerted BY a particle forced to move in a curved path and NOT on that particle. The air moving in the curved path over the top of the wing has some upward momentum that it didn't have before...
MaxManus - Are you still here?
The air moves faster over the rounded top suface of the wing simply because it has to travel further than the air that travels below the wing. When the air at the front (leaing edge) of the wing separates into two parts, those parts must meet at the trailing edge...
We all remember the old TVs with the giant "cathode ray" picture tube. (I even remember and experimented with "vacuum tubes" when I was a kid). In them, electrons streamed from a heated negatively charged electrode and were accelerated by an electric field to paint a picture on the front screen...
Velocity, acceleration, force and others are vectors. Vectors have a magnitude (their numerical size) and direction. In your problem, the opposite directions are represented by positive or negative signs attached to the magnitude.
If you say a force is 27 Newtons, its direction is the same as...