Mechanics

You need to resolve your vector equation in components. It will give you a system of equation which you will be able to resolve in terms of weight.

Yes. Displacement requires a direction and hence is a vector

A spectrum.

Space travel.

A fault

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Recall that mechanical waves are periodic perturbations that move through some kind of medium. The source transfers mechanical energy into the medium to propagate the wave. That said, we can consider a couple of different waves and see how they can be harmful.

Sound is a mechanical wave. It can travel through solids and liquids, but we probably think first that it moves through air. So how can that be bad? If you are in the wrong place at the wrong time, a blast of some kind can drive a pressure wave through air and damage your hearing. Heck, listening to your headphones at high volume can do this to a lesser degree. This is a direct effect of a dangerous level of mechanical energy. How about a couple of examples of harm by what might be termed indirect effect? Let's get to them.

A tsunami is a mechanical wave that moves across the sea. The wave itself may not be fatal, but drowning is a real possibility. We have fresh examples of the human toll taken by these mechanical waves. Enough said about that, yes? Yes.

We know that earthquakes generate mechanical energy, and they can generate a lot of it. Again, the moving ground might not injure anyone, but falling structures can. History is replete with examples of the damage done by quakes, and injuries and fatalities mount up in any assessment.

ive asked a few shops and ive used it a couple good times @ 22.5 ft lbs with 3.1 qt full synthetic oil and oe filter

Is how much radiation goes through a material.

Zero - otherwise it would fall out of the sky.

1. First-class levers have the fulcrum placed between the load and the effort, as in the seesaw, crowbar, and balance scale. If the two arms of the lever are of equal length, as with the balance scale, the effort must be equal to the load. If the effort arm is longer than the load arm, as in the crowbar, the effort travels farther than the load and is less than the load.
2. Second-class levers have the load between the effort and the fulcrum. A wheelbarrow is a second-class lever. The wheel's axle is the fulcrum, the handles take the effort, and the load is placed between them. The effort always travels a greater distance and is less than the load.
3. Third-class levers have the effort placed between the load and the fulcrum. The effort always travels a shorter distance and must be greater than the load. A hammer acts as a third-class lever when it is used to drive in a nail: the fulcrum is the wrist, the effort is applied through the hand, and the load is the resistance of the wood. Another example of a third-class lever is the human forearm: the fulcrum is the elbow, the effort is applied by the biceps muscle, and the load is in the hand.
4. Refer to link below for more information.

Yes, any bolt that has a torque specification should be torqued for safety concerns. Not enough torque on the bolt can allow it to loosen up and too much torque can cause the bolt/nut thread to fail.

By mechanical advantage. The multiple lengths of rope divide the force needed to lift an object everytime the rope reverses direction thru a pully.

One Newton per square metre is one Pascal.

You don't

A rope winds around the pulley so that two ropes hang downwards. Using one side of the rope to apply force causes the pulley to rotate and redirect the force, moving the load upwards even though the pull is applied downwards.

Pressure has to decrease as the amount of air above our head get decreased.

Longitudinal waves.

They are related to the motion of objects.

Erosion is a mechanical process.

A cycle in a sound wave is the time taken for one complete vibration.

A trolley can be used like a "cart" to move loads, but in the physics lab, we usually employ it in a dynamic capacity. By putting a trolley of a given mass on a runway, we can use it to study mechanics. The device used like this and called a dynamic trolley can weigh a few grams or hundreds of kilograms. Little ones sit on a bench in the physics lab. Have you seen those video clips on TV where a rolling sled slams into a vehicle in a crash test? That sled is a dynamic trolley. Its mass (and the distribution of that mass across its frame) are all calculated. It might look like a big weight on wheels, but it's much more than that.

Molecules are not part of a quark, quite the reverse.
Quarks are theoretical particles that make up, in various combinations, subatomic particles such as protons and neutrons.
Protons, neutrons and electrons make up atoms of elements in their various combinations.
Atoms of elements make up molecules in their various combinations.

The torque is the component of the weight that is perpendicular to the bar. So when the bar hangs vertically down, parallel to the force of gravity, there is no torque. If the bar makes an angle "A" with the vertical then the component of weight perpendicular to the bar would be mgSin(A) and the torque would be mgLSin(A) , where m= 1.21 kg, and L = 1.28m, g=9.8m/ss , so all you need is the angle "A".