Mechanics

A crane is a first class lever when it is winching in or out the rope attached to a load.

The crane becomes 3rd class lever when it's boom is luffing, i.e. it is being lowererd or raised.

Fan coil units don't have inherent static pressures, but it has to overcome the static pressures when it will be ducted to a system. Static pressure and pressure losses however can be determined accordingly in ducts. The designer sizes up the ducts to overcomes this losses and give the fan's output to the point of application sizing the duct to overcome frictional losses as much as it could to meet the space requirements cooling load. This value is the amount of resistance the fan will be able to overcome within the system it is ducted to and still be able to provide the designed air flow. For example if your fan coil unit is ducted on the supply side and the total frictional resistance of the ductwork and diffuser is below that of the fan coil units static pressure you won't have a problem. If on the other hand, the frictional resistance is greater, you won't see the design air flow at the diffuser. In general you can calculate a system's resistance with the following rules of thumb: 0.1"/100ft of duct, 0.1" per elbow, 0.1" at the diffuser. The fan will probably rated between 0.3" & 0.7" of water gauge.

When the net forces acting on an object sum to zero

then the object's acceleration is zero.

It depends on what you're reffering to. Maybe what you're looking for is Cause & Effect (?) [Sorry if this didn't help]

F[net]=ma ([net] force = mass X acceleration). It is possible. While mass can't be negative, acceleration depends on which direction you're measuring to be positive. If you're acceleration is negative, so is your net force. For example, if you're traveling 60 mph southward, and apply the breaks at -4.7 m/s/s, to find the net force (This works because your car technically would have been in equilibrium had it stayed at 60 mph in the same direction), you would simply multiply your rate of acceleration by the mass of your vehicle, say 1000 kg, which would give you a net force (all forces cosidered) of -4700N southward. At the same time, this could be taken as positive 4700N northward; hence it's directionally dependent. But, long story short, yes; it is possible to have a negative net force, because force is a vector (Includes direction and quantity).

Hope this helps!

- Fellow physics student

Archimedes' invention of the screw is for digging into things. A drill is an example of a screw. During Archimedes' time, people used the screw to bring water from low ground level to high ground level. The screw is also used for building things too. They are used like nails to put things together.

Accelerate, motion is generated by applying force to mass.

The mechanical advantage is the ratio of the distance your hand moves to the distance the piston travels. For instance, if the lever is 21" long and a full rotation of the level produces a piston travel of 7" then your hand would move 2*pi*21" (131.9"). The ratio 131.9:7 reduces to 18.8:1. If you wanted to produce 1 ton (2000 lbs) of force on the piston you have to appy 106 lbs on the 21" lever.

Rest implies stationary, equilibrium implies a resultant force of zero. Therefore, a body in equilibrium could be moving, for example a sky diver at terminal velocity, where resistive forces are equal to the force of gravity. This means that a body can be in equilibrium and not at rest, but a body at rest MUST be in equilibrium, otherwise it would move. So, to answer the question is: It's impossible.

Yes, pressure at a given point in a non-moving fluid is transmitted equally in all directions. This is known as Pascal's principle, where an increase in pressure at any point in a confined fluid is transmitted undiminished in all directions throughout the fluid.

Inertia.

The way I would put it is : The Earth's tangential velocity, combined with the

force of gravity results in the Earth's orbital motion. So the Earth orbits the Sun

instead of falling into it.

It might be easier to calculate using numeric values directly if the equation is really simple.

Ductility is the physical property related to the ability of a metal to be easily transformed in wires.

The object continues moving in a straight line at its current speed.

Mu k (pronounced mew K)

This is used in physics to describe friction between two objects. It will have a value in an equation depending on what the friction is between two objects.

For instance two ice cubes will easily slide on one another. Two pieces of sandpaper will have a higher Mu k value because they don't slip on each other as easily.

A. move the fulcrum rock closer to the boulder.

A Mouse Trap.

The Strong Nuclear Force is the strongest force.

1- It has direction.

2- It has magnitude.

3- It is the sum of all forces( normal + tangential).

net force = square root( normal force2 + tangential force2).

the barrel could have one side weighted on the inside and then pushed up a slight incline so that it traveled up a slightly inclined hill.

• Simple machines, such as a lever, inclined plane, or wheel and axle, give you a mechanical advantage.
• You calculate the mechanical advantage of a simple machine by dividing the output force by the input force.

torque of synchronous motor with out feild exitation

because sand makes friction from the ice

Measure the thickness of multiple sheets (Say, ten or twenty) then divide the answer by the number of sheets to get the thickness of a single sheet.