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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
Does rolling friction always reduce the net force acting on against an objects motion to zero?
The net force will be zero only if the velocity is constant, which means acceleration is zero.
How can you decrease the effort force needed to push a weight to the top of the ramp?
Simply oil the ramp. Although you may not want to, because you will have to push up on an oily ramp, so you will slide down, and so will the crate. --An AP Physics Student Bored in Study Hall
Call the angle from the incident ray to the normal X. The angle of the reflected ray to the normal also has to be X because the incidence angle and the reflected angle are equal by law of reflection. Since the angle between the reflected and incident ray is 90 degrees:
2*X = 90
So, X = 45 degrees.
Buoyant air will rise until it?
Buoyant air will rise until it reaches warmer air that is the same density as itself.
What is the frequency of the mains supply in the UK?
According to the Wikipedia article on mains electricity by country, the power in the UK operates at 50Hz. There is a link below to the article.
The force exerted on the table by a ball IS the weight of the ball.
What are some interesting facts about transverse waves?
Lots of things are true about transverse waves. Feel free to ask more specific questions.
What is dimension for angular velocity?
rads/s
radians/second
Usually its stated as rpm (rounds per minute) but it usually needs to be converted to rads/s for calculations.
1 rad/s= (1 rpm)*2*pi/60
What is the amplitude of ultraviolet waves?
Ultraviolet waves can have different amplitudes, from very small to very large. There is no specific amplitude that they always have.
Can an egg float on salt water and why?
Yes, a raw egg will float if the salt concentration is high enough. This is possible because adding salt creates a solution with a greater density than water. As more salt is added, the density of the solution increases. At a certain point, the density of the solution becomes greater than the density of the raw egg, allowing the egg to float in the solution.
*This experiment is a very good demonstration of the principle of buoyancy.
It would be 76.3N , bearing 013.4 degree (13.4 degree clockwise from North)
force in 3 significant figure, exact value sqrt 5825; degree in 1 decimal place, exact value sin-1 (65/sqrt 5825)
One mole of N2 gas at STP will occupy what volume?
22.4 L. At STP 1 mole of any gas will always be equal to 22.4 L.
A compound machine is a machine made of two or more simple machines.
A compound machine also moves in more tha one movement.
Any combination of simple machines working together
a combination of 2 simple machines.. (simple machines include lever, inclined plane,wedge,screw,pulley,wheel and axle,)
examples of compound machines are bicycle fork knife and car..
compound machinemachine made up of a combination of two or more simple machines.
Compound machines are machines that consist of one or more simple machines (such as a screw and a pulley or a lever and a wedge).
A compound machine is a machine made out of two or more simple machines (such as a screw and a pulley or a lever and a wedge).
Machine - is a device that helps us do work (work is a force that acts on an object to make the object move. To get work, you multiply force by distance)
A simple machine - is a tool or device made up of one basic machine (there are 6 simple machines screw, ramp/inclined plane, wedge, pulley, wheel and axele, and levers.)
ex. of simple machines are: (screw - screw, hose nozzle, etc.) (inclined plane - slide, ramp etc. ) (wedge -chisel, knife, etc.) (pulley - crane, flagpole, etc.) (wheel and axle - door knob, steering wheel, bicycle wheel, etc.) (Lever - 1st class lever: see -saw, 2nd class leer: wheelbarrow, 3rd class Lever: hockey stick, broom, etc.)
a Complex Machine - is a system in which simple machines all work together, parts of a complex machine that have just one function are called subsystems and often contain a simple machine.
ex. of complex machines can be as simple as scissors, or as complicated as a lab top
A complex machine is really 2 or more simple machines in one machine
ex. Car or a bicycle
answer is 20newton
How would the potential energy of an object be different on the moon?
The gravitational potential energy would be less for the same height above the surface. This is because the gravitational constant on the moon is less than that of the Earth. Potential energy is defined as mgh, where m is the mass, g is the gravitational constant, and h is the height.
When the input signal to a transmission line is terminated by its characteristic impedance then the signal gets absorbed in the terminating impedance itself and is not reflected back along the line. Thus, no standing waves are produced in the transmission line.
What is the net force equation?
It means the same as the sum of all the forces acting on an object. Note that since forces are vectors, they have to be added as such.
For example, an book resting on a table has gravity pulling it down; on the other hand, the table is pushing the book upwards (by Newton's Third Law; since the book pushes down on the table). Adding all the forces together, you get a zero force - which must be so, for the object to remain at rest.
What happens if 2 light waves with the same amplitude interfere?
Their amplitude is not the important variable - their frequency is . If two light waves of the same frequency interact, then an interference pattern will be seen. This is the basis of the 'double slit' experiment designed to demonstrate that light may be considered to indeed be waves.
If there is no friction or anything that can impede the movement off the object, then the force is zero. If there is friction, then the force is equal to that of the friction.
When a force is applied to a body in what direction will the body accelerate?
Acceleration is in the same direction as the applied force.
