Kinematics

A contact force, such as friction. If a car wheel wasn't on the ground there couldn't be friction. A non-contact force could be magnets, the two magnets don't need to touch to repel or attract :)

Divide by 6 and shift the decimal place = 50 kph

Multiply km per hour by 0.621 to get miles per hour.

1 km*

1 mi

1.609344 km

=

0.6213711922 mi

Gravitational force is the natural phenomenon that causes objects with mass to be attracted to one another. For example, the gravitational force between the Earth and the Moon is what keeps the Moon in orbit around the Earth.

Think of it as the difference in moment of inertias for two solid cubes. Calculate the moment of inertia of a solid cube with dimensions equal to the inner dimensions of your hollow cube. Then calculate the moment of inertia of a solid cube with dimensions equal to the outer dimensions of your hollow cube. Subtract the moment of inertia of the inner dimensions from the moment of inertia of the outer dimensions to get the moment of inertia of what's left. Same concept applies to finding the area of a thin-walled circle. Outer area - inner area = total area. Outer moment of inertia - inner moment of inertia = total moment of inertia.

This approach won't work however if you're considering hollow shell - a cube with walls of zero thickness.

If the axis of rotation goes through the cube center, perpendicular to one of its walls, first calculate moment of inertia of the wall that the axis passes through (let's call it Ia).

For all equations below d equals surface density(mass per unit of area) and a is length of cube's side.

Ia= d * a4 / 6

Then you have to calculate moments of inertia of four walls parallel to the axis.

This will be Ib=4 * Iwall=4*d*a4/3.

Total moment of the shell will be then:

I=2*Ia+Ib=1.5*d*a4.

If the axis is through the center and ┴ one face, I = (m/6)*[a² - (a-t)²], or

I = (m/6)(2at - t²) for any value of t, however small.

Source: CRC Std Math Tables

Yes. Potential energy is energy that has not yet been released. Kinetic energy is energy or an object already in motion.

Think of a ball 1 mile up in the air that begins to fall. After it has fallen 10 feet, releasing some, but not all of its potential energy, it has built up some kenetic energy as well from the motion of falling 10 feet, but still has 5270 feet worth of potential energy to go. What happens as the ball falls is that it gradually changes all of its potential energy into kinetic energy.co

Kinetic energy is possessed by moving bodies so that is easy. Potential energy comes in different forms - gravitational for instance due to height above the surface of the earth. Other forms like chemical, nuclear, elastic, are not so obvious, you need to know the properties of the material before it can be estimated.

Assuming body mass of m, your weight would be Q = mg.

Force due to that much acceleration would be

F = 34100mg,

and it would have to be completely countered by force of friction:

T = fQ = fmg.

Comparing the two equations:

f = 34100 which is an astronomical number and no combination of surface materials can ever achieve that.

Assumed acceleration of 34100 G is ridiculous at best, not even bolting the body to surface would hold it - assuming body mass of 100 kg, the experienced force of inertia would be in order of 3 500 000 kG.

WOW, 5 MILES PER SECOND. I guess that I would have to calculate the miles per hour. To do this, we must multiply 5 miles per second times 3600(the number of seconds in an hour). That is 18000 miles per hour. I like to work in the SI system, so by converting this to meters per second, we get 8.04672E3 meters per second. Kinetic energy is defined as one half mvsquared. The Kinetic Energy is equal to 3.2374E10 Joules.

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Momentum = (mass x velocity) = M V

If velocity is doubled, then new momentum = (M x 2V) = 2 x (M V) = double the original momentum.

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Kinetic energy = 1/2 M V2

If 'V' is doubled, then new KE = (1/2 M) (2V)2 = (1/2 M) (4V2) = 4 (1/2 M V2) = 4 times original KE.

85 mph = 124.7 feet per second.

500 mph = 804.7 kph

Gravitational potential energy equals mgh, where m is mass, g is acceleration due to gravity (9.81 m/s2), and h is height.

Ug = mgh

Solving for m:

m = Ug/(gh)

So, to find the mass, divide the gravitational potential energy by the quantity height times 9.81 m/s2 (make sure your units match up).

5.2 miles per hour is about 8.37 km/hr.

(1 mph is about 1.61 kph)

360,000 miles per hour.

Answer: 2472 km/h = 1,536.029 mph

About 46 mph.

Critical Mach Number, or Mcr, refers to the lowest Mach number that air going over and around an aircraft can reach the speed of sound. If an airplane goes over its Mcr, handling might be greatly affected.

its the volume of a cube with the length width and height all being 1cm its the volume of a cube with the length width and height all being 1cm

The kinetic energy of a substance is the total energy associated with the movement of all its particles. The kinetic energy of individual particles is the energy due to their motion. The two are related, as the total kinetic energy of a substance is the sum of the kinetic energies of all its particles.

W/o friction, every bite you speared would slide right off the fork. The slightest draught would have the plates and glasses sail right off the table. And it'd be really hard to hold on to the cutlery.