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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
What is the difference between clean gas induction and regular EGR?
CGI or Clean Gas Induction is a technology found in some engines (stratified charge engines, ACERT-engine technology) to reduce harmful environmental emissions and enhance fuel efficiency. CGI is commonly found in engines that operate on diesel or gas.
An EGR valve is a technology responsible for making sure that the ignition system runs smoothly and effieciently, and a regular EGR valve cleaning can help to protect the valve and your internal combustion engine. It is essential to keep dust and solids away from the valves.
If every iron atom is a tiny magnet why aren't all iron materials themselves magnets?
The magnetic fields produced by each and atom is not aligned in the same direction and have random direction and thus they cancel each others magnetic field and thus the
iron does not behave like a magnet
the longer you make the pendulum arm the longer it will take to perform its swing,the same thing would happen if you only increased the weight on the end of the arm.
A water? Question really makes no sense. Please rephrase.
Why is it advantageous to use steam as hot as possible in a steam driven turbine?
in practice;
the steam MUST be in the superheated region before entering the turbine.
superheated steam means there is not moister in the steam (dry steam)
the reason is moister will damage the turbine blades.
in theory;
the hotter the temperature the better the efficiency (look up vapor power cycles)
work done by the turbine = the enthalpy (at temp. of steam entering the turbine)- the enthalpy at the turbine exist.
the efficiency = work done by the turbine / the heat input.
When throw an object upward and return after 6 seconds what was its initial velocity?
Use the equation vf = vi + gt, where vf is final velocity, vi is initial velocity, g is acceleration due to gravity, and t is time.
Known:
vf = 0m/s
g = -9.8m/s2
t = 6s
Unknown:
vi
Equation:
vf = vi + gt
Solution:
vi = vf - gt
vi = 0m/s - (-9.8m/s2)(6s) = 58.8m/s = 60m/s (rounded to 1 significant figure)
Yes, if it is already moving East but decelerating i.e. accelerating to the west. The other condition when there is velocity to the east while accelerating to the west is when it is moving at an angle to the East-West line.
To accelerate a body one must change its velocity or direction at an instantaneous moment. Since in a the velocity is uniform the direction at every point on the circular path is different. Thus making it accelerated.
Is it possible to create friction with the rotation of the Earth to create energy?
There are several problems with your question-- namely, that friction doesn't "create" energy; nothing can (except via the mass-energy-equivalence formula). Friction would actually be more accurately be defined to be the force that causes the change of energy into heat energy. If you're asking if it would possible to create some kind of energy generator using the Earth's rotation as the power source, then I'm not entirely sure that would be possible. For one, you would somehow need to make the generator independent of the rotation of the Earth by hanging it either under some kind of balloon or in space-- both of which ideas seem highly tedious as cheaper and more available sources of energy exist (sun, wind, waves, etc.). Then you would need to set a kind of giant wheel on the Earth to power the generator as the Earth turns... I'm almost certain many countries will be adverse to the idea of a giant space wheel crawling across their territory once a day. A slightly more plausable idea would be to use Earth's natural magnetic field as an induction electricity generator. But who knows, maybe a couple years in the future you'll win the Nobel prize for this idea and I'll be sitting here saying, "hey! That's the guy I discouraged on the internet!". Good luck!
Why should people check the air pressure in their tires in winter?
In the winter, tires tend to loose capacity and shrink. Therefore making the air level decrease.
Is direction is important for equal vectors?
Equal vectors are vectors having same direction of action or orientation as well as same magnitude. If two or more vectors have same magnitude but different direction then they cannot be called equal vectors. This shows that direction is important for equal vectors.
Wedges are used to lift, tighten, spread, or even break..depending on the application.
How many mph does the world turn at?
The earth rotates on its axis once each day. Since the circumference of the earth at the equator is 24,901.55 miles, a spot on the equator rotates at approximately 1037.5646 miles per hour (1037.5646 times 24 equals 24,901.55) (1669.8 km/h). At the North Pole (90 degrees north) and South Pole (90 degrees south), the speed is effectively zero since that spot rotates once in 24 hours, a very, very slow speed. To determine the speed at any other latitude, simply multiply the cosine of the degree latitude times the speed of 1037.5646. Thus, at 45 degrees north, the cosine is .7071068 so multiply .7071068 times 1037.5464 and the speed of the rotation is 733.65611 miles per hour (1180.7 km/h). For other latitudes... 10° - 1021.7837 mph (1644.4 km/h)
20° - 974.9747 mph (1569.1 km/h)
30° - 898.54154 mph (1446.1 km/h)
40° - 794.80665 mph (1279.1 km/h)
50° - 666.92197 mph (1073.3 km/h)
60° - 518.7732 mph (834.9 km/h)
70° - 354.86177 mph (571.1 km/h)
80° - 180.16804 mph (289.95 km/h) In addition to the rotational speed of the earth spinning on its axis, the earth is also speeding at about 66,660 miles per hour (107278.87 km/h) in its revolution around the sun once ever 365.2425 days.
Does friction oppose an object's motion?
Friction always mimics a force in a direction exactly opposite to the object's motion.
So its effect is always to rob the moving object of speed, velocity, kinetic energy,
and momentum.
What is the restraining torque?
Restraining torque refers to the torque exerted by a mechanism or device that opposes the motion of a rotating object. It acts to prevent or limit the rotation, often as a result of friction, load, or other forces. In engineering, understanding restraining torque is crucial for designing systems like brakes, clutches, and other mechanical components to ensure stability and control.
What is the formula for converting frequency of light into wavelength?
wavelength = c/frequency of light where c is the speed of light.
The speed at which you fall varies depending on your body position in freefall, your size, your weight and what type of clothing you are wearing.
For instance, the biggest discipline is formation skydiving. This averages around 120mph in a belly to earth body position. Generally, slick nylon type jumpsuits are worn which reduce the drag. In the discipline of freefly, skydivers freefall in a head-up or head-down position. This means they have less drag and therefore fall faster, typically around the 150mph mark.
What stops you continuing to freefall faster and faster is the drag of the air against your body. The higher you jump from, the faster you will fall, but this is not particularly noticable from an average skydiving height of 13,000ft. If you were to triple the altitude, you could expect to noice a dramatic increase in your terminal velocity.
At Skydive Hibaldstow where I jump, it hosts another discipline, speed skydiving. The idea is get the fastest average over a measured vertical kilometer. Winning speeds at the UK Nationals 2010 were around 265mph average.
Can a person walk if there is no friction on the surface?
no because you would be sliding if there was no friction.Friction resists the motion caused by another force
What is the energy and wavelength of a light of 720 nanometer?
Wavelength is 720 nanometers.
Energy is 2.72 x 10-19 joules.
Moment of inertia of a semi circular wire of mass m?
If we are considering the semi circular wire of mass m to have a relatively small cross sectional radius, r compared to radius of the semi circular arc, R
And that we are considering the semi circular wire to lie in a xy plane. The mass moment of inertia taken about the z-axis (perpendicular to the plane) located at the cg position will be.
Izz=m*(R^2)*(PI-(4/PI))/PI
I did a check of this calculation with the way Catia calculated the same property. And the difference was found to be 0.03% When using the following geometry.
density=0.000001kgmm^3
Semi circular wire Radius R =60mm
cross sectional radius of wire = 1mm
results from Catia
V=592.176mm^3
m=0.000592176kg
Izz=1.268159kgmm^2
hand calculated results
V=592.176mm^3
m=0.000592176kg
Izz=1.267835kgmm^2
% difference [((1.268159)-(1.267835))/(1.267835)]*100=0.03%
Please carry out a check on the Izz calc. I determined it from 1st principles, so I may of made a mistake
What stops first a heavy object or a light one?
A light object has less momentum than a heavy object. A light object would stop first.
The formula for the force of friction is Ff=μFn Where Ff is force friction; μ is the coefficient of friction; and Fn is Force Normal (The force that a surface pushes back on a object)
Force normal is equal to gravity times mass since the object is not falling or accelerating upwards.
Therefore your formula can be manipulated to:
Ff=μmg Where m is mass; and g is gravity (9.81)
Substitute your variables, therefore you get:
500N=μ(200kg)(9.81)
μ=0.254841998
