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Mechanics
Mechanics is the branch of physics that deals with the interactions of objects and forces in the observable world. Questions asking about projectile motion, conservation of energy, and calculus based mechanics are perfect for this topic, but questions about repairs that a mechanic would do belong in our vehicles categories.
2,416 Questions
Simple Answer:
Photons are never at rest. It is a fundamental property of the photon that it moves always at the speed of light.
Complex Answer:
Only in a vacuum can we say that light travels at the universal speed, c; the speed of light.
Of course, "the speed of light" is slower for a light moving inside of matter. Indeed, the simplest form of this is demonstrated with light passing through glass where refraction occurs and the speed drops to v=c/n, where v is the speed of light in matter, c is the speed of light in vacuum and n is the index of refraction of the material.
In recent years, it has been demonstrated that under versy special circumstances, light from a laser may be slowed to a few meters per second. That is extreme, but the circumstances constructed to achieve such a phenomena are also extreme.
Some people would say that when a photon passes through matter, it ceases to become one photon and is immersed in a sea of photons that constitute the electromagnetic interactions in that matter. Most people will not invoke this issues when discussing light in matter, but if one wants to stay entirely in the language of photons, the sea of photons has to be incorporated.
With all that said, the answer remains that there are no ways known to make a photon exist in a state of rest.
Can the net force on an object ever equal zero?
Poorly phrased question as the correct answer is merely "Yes, you can." To answer the question probably intended: "How do you distinguish between one object experiencing zero net force and another experiencing non-zero net force?"
The first object will be at rest or will have a constant velocity (i.e. speed and direction). The second will have a changing velocity (i.e. a changing speed and/or direction of motion) or, in other words, it will be accelerating (or decelerating).
What is the principle of screw gauge?
A screw gauge works on the principle of screw. This screw principle helps to convert smaller distances into larger ones by measuring the rotation of the screw. It amplifies the smaller dimensions and this converts into larger ones. When we rotate the screw, there's a linear movement of the main scale.
Pressure= force per unit area.
P for 5 N on 2 m area = 5/2.
P for 10 N on same area= 10/2 which is twice the pressure from above.
An object moving with a constant speed of 2 net force?
Because F=ma, If an object is moving at a constant velocity(speed), then there can be no net force acting on the object. This means that there is a dispersive force i.e Drag or friction acting on the object equal to 2 but in the opposite direction to motion.
What happens when air passes in between tall buildings?
It depends on several factors, including the shape of the buildings and the direction of the wind. Very generally speaking, the air near the surfaces of the building will slow down, due to drag and resulting turbulent flow, and that farthest from the building(s) will move the fastest.
Any change in velocity, whether to speed up, slow down, or just change direction, results from acceleration. Acceleration is an expression of the rate of change of velocity.
Well depending on what you have been promoted to such as: Vice president or Janitor or even a chef,
If you where a chef You would have the POWER to tell other lower promoted chefs to chop or fry something
And people like to relate to that as power, like being captain or refere in a game you could tell them what to do.
Hope this helps!
What does potentail energy make or produced?
Energy is the ability to do work. Potential energy is the energy a body has because of its position.
How do you interpret how an object is moving from a distance time graph?
If the distance is not changing, the object is not moving.
If the distance is increasing or decreasing linearly then the object is moving at a constant velocity.
If the distance is increasing or decreasing parabolically then the object is being accelerated or decellerated.
the potential energy will be the greatest when the ball is at its highest point in the aire
Swimming. Knowing I would not sink made feel safe.
Taking off in an aircraft: I felt heavier.
What are ways of changing momentum?
You change momentum by changing mass or, more commonly, velocity.
What is the value of the friction coefficient between water and air?
Air and friction both being fluids, the resistive forces between them are more related to drag than friction.
Is a rope wave a longitudinal wave?
No, rope wave is a transverse wave, because the direction of oscillation is perpendicular to the direction of movement of wave.
What is the net force that acts on a 10 newton freely falling object?
The net force is the vector sum of all the forces acting on the object....So that is...(20+10=30)N acting in the same direction.........
