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Kinematics
Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.
3,459 Questions
The answer is: The momentum (mv) after the collision is the same as
the momentum before it. The rest is just arithmetic.
Before the collision, the momentum of the bullet is mv=(0.01)x(400) = 4 kg-m/sec.
After the collision, the combined mass of the wood block plus the bullet is 910 gm.
Its momentum mv=(0.910)x(v) = 4 kgm-m/sec.
v = 4/0.910 = 4.396 m/sec .
I've ignored the momentum lost during the embedding due to crunching and splintering,
both because I don't know anything about the properties of the wood, and also because
I wouldn't know what to do with them.
If you are going 35 mph how many feet will you travel in 10 seconds?
146.66 feet every 10 seconds at 10 mph.
What does the slope of the line on a position versus time graph tell you about the objects speed?
The distance versus time graph shows the position of the object. The slope of the line shows the velocity of the object. The velocity is the direction and speed of an object. If your slope has a positive slant that means you are going in a positive direction. If the slope has a negative slant your object is going in a negative direction. If your slope is zero (a horizontal line) that means your object has stopped and is about to change directions.
In case you didnt know a positive slant looks like this on a graph.... /
a negative slant looks like this on a graph.... \
postive is like sloping up a hill
negative is like falling down the hill
What is top speed for the 2005 yz250f?
the top speed on my 87 lt250r with no mods is 88 mph, although when that speed was reached the front end seem to shake and wobble violenty, I do not recommend doing tghis on the street as i did! I hope this helps, Oh yeh the reason i know is thatit costed me around 700.00 dollars for fleeing and illuding !!!
This type of force needs to touch something to affect it?
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 :)
How do you change the kilometers per hour to miles per hour?
Multiply km per hour by 0.621 to get miles per hour.
1 km*
1 mi
1.609344 km
=
0.6213711922 mi
How do you use gravitational force in a sentence?
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.
What is the moment of inertia of a cube with uniform density about any edge?
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
Can an object have no either potential energy and kinetic energy?
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
How can you determined how much kinetic energy an object has?
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.
Two possible reasons:
- the streaks aren't as much caused by the rain drops as by the wipers. Imperfections in the wiper blades cause them to leave streaks behind.
- when a rain drop hits a windshield the forces of the air flow over the car will begin to hit it. Depending on the aerodynamics of the car the drops can be pushed in different directions.
Which has the most kinetic energy a 1000 kg car traveling 30 ms or a car traveling 45 ms?
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.
When mass and speed of a moving body are doubled what happens to its kinetic energy?
Momentum = (mass x velocity) = M V
If velocity is doubled, then new momentum = (M x 2V) = 2 x (M V) = double the original momentum.
=========================
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.
How do you find an objects mass if you know the height above the ground and the potential energy?
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).
An example of two surfaces that have a low coefficient of friction?
human joints are an excellent example. they have a static friction coefficient of .01 μs and a kinectic friction coefficient of .003 μk
another good example would be waxed wood on dry snow (as in a snowboard on a ski slope) this has a static friction coefficient of .04 μs
Hope this helped!
What is 5 miles per hour in kilometers?
5.2 miles per hour is about 8.37 km/hr.
(1 mph is about 1.61 kph)
