0
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
For this question, we will use the formula K = 1\2 mv2. But first, we must convert the 65 miles per hour into meters per second. Multiply miles per hour by a factor of 1.609 to get kilometers per hour. Divide this answer by 3600 to get kilometers per second. Multiply this by 1000 to get meters per second. In this case, the velocity in meters per second is aproxamitely 29 meters per second. To get the kinetic energy, we multiply one half, times the mass 750 kg, times 292 meters per second. This yields 315375 Joules. If we halved the velocity, the kinetic energy would be one-fourth that of the original kinetic energy. This is because the velocity is squared. This holds true if we go to one third the original speed. Then it would be one-ninth of the original kinetic energy.
Pneumatics is the use of pressurized air to effect mechanical motion. Pneumatics is used in a variety of different areas.For example in dentistry applications, pneumatic drills are lighter, faster, and simpler than an electric drill of the same power rating (because the prime component, the compressor, is separate from the drill and pumped air is capable of rotating the drill bit at extremely high rpm). Pneumatic transfer systems are employed in many industries to move powders and devices. Pneumatic tubes can carry objects over distances. Pneumatic devices are also used where electric motors cannot be used for safety reasons, such as deep in a mine where explosive dust or gases may be present.
What is an angular speed of a rotating body?
Angular velocity is given as radians per second; angular speed is also the same thing. Velocity is a vector with magnitude and direction and speed a scalar with magnitude only. The magnitude is identical; velocity will define the direction of rotation ( clockwise or counterclockwise).
What is the net force on an object at rest?
A moving object with no forces acting on it will continue to move because of inertia. For example, if the object is a chunk of rock in deep space, there will be nothing to slow it down and it might tumble for millenia. In contrast, a ball rolling across a grass field will have the force of friction from the grass (and a bit from air) slowing it down.
Loudness is the human perception of sound wave?
The amplitude of sound waves is what humans perceive as loudness.
What causes friction and why does it occur?
Friction is caused by two or more surfaces rubbing together. At the molecular level, the particles are coming in contact with each other and, to put it simply, are sticking. The more particles there are in an object, the more they stick. This is called an objects adhesion potential.
What are the units for potential energy?
It is the energy stored in a body due to its shape and position.
What is the purpose of a screw?
The screw is one of the six (or seven) Aristotelian 'Simple Machines' that enable humans to do work by redirecting or focusing force.
A screw is a fastener.
Name the different types of forces?
Forces might be described as contact and non-contact forces.
Contact forces would include friction, pressure, etc.
Non-contact forces are more basic and include gravitational force, electromagnetic force, electro-weak force, and others.
How do you reduce static friction?
Friction is really molecular (atomic) cohesion. There is a technical term, but being that memory isn't what it used to be, call it "stiction" (sticky + friction) and we'll be good. There are basically three ways to minimize friction. One is construction, fabrication or devices. (You choose.) Use ball bearings instead of non-moving metal-to-metal contact. Use materials that are less sticky, like teflon and such. The second way is lubrication. No explanation necessary. The last is method or technique. Use a method that distributes the friction over time. Instead of dragging both the boxes, drag one at a time. It doesn't reduce friction, but it reduces the need for large amounts of power for one evolution. Surf to the Wikipedia article, read the article and then come back here and carve this up to make a real answer. (No, I won't mind.)
If a force F (measured in newtons, N) is applied to move an object a distance d (measured in metres, m) in the direction of the line of force, the work done W (measured in joules, J) is given by:
W = F d
Crucially, d is the distance moved in the direction of the line of force. Assuming the force is applied parallel to the ramp:
W = 425 N x 2 m
= 850 J
What is Lubricants blank friction by replacing sliding friction with fluid friction?
reduce
shelbyjohnson
How can you measure the sliding friction?
In physics a number known as the 'coefficient of friction' is used to calculate the frictional force between any two surfaces. Ff=µFn, Meaning that the frictional force (Ff) is equal to the coefficient of friction (µ) multiplied by the normal force (Fn).
If one wishes to calculate the coefficient of friction for two objects, you can pull an object of whatever material you wish along a floor of whatever material you wish. As long as the object remains at a constant speed, the force which you use to pull the object (which can be measured by a force meter) is equal to the frictional force. Once you find the normal force (to find the normal multiply the mass of the object by the acceleration due to gravity on your part of the world, Fn= mg) you simply divide the frictional force by the normal force and you have the coefficient of friction.
or just ask your teacher lol
What is the centripetal force that causes it to move in a circle?
Centripetal force, which is the product of the mass and the centripetal acceleration.
Fcp = m x acp
You can measure the acp in various ways:
acp = v2 / r acp = ω2 x r
Why does a needle float in water?
It doesn't actually float, since its density is greater than water. It is kept from sinking by the surface tensionof the water. This phenomenon is created by the formation of polar bonds between the surface water molecules. To make this happen, the needle must be carefully placed on the calm surface of the water, usually held in a container like a glass tumbler (easier to keep the surface calm, than in a wider container like a bowl).
If you wish to prove this principle, here is a very successful method:
1. Place a piece of tissue, slightly larger than the needle is long, flat on the surface of the water.
2. Lay the needle carefully on the tissue.
When the tissue becomes saturated and sinks away from the needle, the needle will remain on the surface of the water. If you wish, once the tissue sinks, It can be removed (carefully) from the system with tweezers. Then you can amaze your friends with your imponderable, impossible feat, of floating a needle. This method will work with a paper clip as well. Any metal object, with smooth surfaces and not too heavy, may be used.
Tip: shape matters. Common pins have been used, but often they won't work because their heads breach the tension membrane.
More Information:
Surface tension. The needle is thin and light, so it just lays on the water. Surface tension is what we call a thin flexible membrane, formed by the polar bonding of surface water molecules, to each other. like a water bed for very light objects.
What is uniformly accelerated motion?
It means that acceleration is constant.
This meaning that velocity is varying with respect to time, we see this by this formula (v - v(initial) ) / t (Time).
Difference between single and multi stage compressors?
Yes and no. The dual stage compressor runs louder (usually), but it takes less time to fill and keep the tank at optimum pressure (recovery time), the dual stage is also the more expensive.
The size air compressor should be determined by the amount of air and/or size or number of tools you will be using at the same time.
How do shock absorbers limit the bouce in car's ride?
Basically by acting as a brake for the bouncing movement. Shocks consists of pistons moving in an oil filled cylinder. As the piston moves, the oil has to squeeze past from one side of the piston to another,which slows the movement down.
What is an example of static friction?
Static friction is the friction the object must be able to overcome in order to move. I'm sure you've noticed that you have to work hard to get an object to move, but once its moving, it is easier to push it. That is because static friction is greater that kinetic friction.
Is area scalar or vector quantity?
area is scalar.because we will not say that your area in this direction and my area in this direction . so,area has only magnitude
Answer2: the product of two displacements produce a vector area, AxB this is a vector area. BxA is an opposite area.
What is the equation for linear momentum?
A way to designate momentum is using P. You can simply write Pi=Pf. If you have multiple particles, use P1i, P2i, etc.
When the Earth is traveling, everything on the Earth is traveling with it, in the same frame of reference.
For example, when you are in a car or an airplane and you flip a coin in the air, the coin doesn't shoot backwards. Or, notice that when you jump upwards that the Earth didn't move from under you when you jumped.
What is the period of a sound wave whose wavelength is 17.0 m?
Divide the speed of sound by the wavelength, to get the frequency. The period is the reciprocal of the frequency.
The speed of sound in air is about 343 meters/second, but it depends on temperature. The speed of sound in other materials is quite different from the speed of sound in air.
