In centrifugation why the brake is not applied?
85741
because it will change your car's attitude in the turn and you will loose it
834341
The friction is Ff = Uk*m*g = 0.71*m*g.\n\nThe car had original kinetic energy KEo of (1/2)*m*v^2. At 25 km/h, the car had KE25 of (1/2)*m*(25 km/h)^2. Convert to m/s before squaring. Find an expression for delta kinetic energy that the brakes scrubbed off before impact.\n\nThe friction had to do work equal to the delta kinetic energy to bring the car down to 25 km/h. Work is force*distance so\nW = Ff*d = 0.71*m*g*47 m\nand work is also is equal to delta KE\nSet them equal and solve for v.
189434
Do a heat balance on all of the energy going in and all the energy going out. on the output side that portion left over after measuring the shaft output and the portion going out as exhaust gases is due to friction.
853764
he does has KE. if he doesn't , he wud be at rest in his seat if the brakes r applied suddenly. Observe this out from the bus. This's all bcoz of inertia of motion
1007077
You are quite right (and others quite wrong) - centrifugal force is not real.\n\nCircular motion requires an inward (centripetal) force towards the centre of motion. Take that inward force away and object just carry on in a straight line with the velocity they had when the force was removed.\n\nNow for the spinning Earth think about where that force comes from. Its main source is gravity (think about it, it does not take a lot of force to pull bits of soil apart). And the force due to gravity at the surface of the Earth is more or less constant.\n\nBut at the equator, the force needed to keep the surface rotating and not flying into space is higher than it is at the poles, because the radius from the axis is larger. But the force or gravity is the same. So gravity can't hold things in quite as close. So the Earth tends to bulge in its middle.
490009
Because the normal force of the road upon the car is not directed straight upwards, as it is on a flat road. The normal force vector is tilted inward toward the center of the radius of curvature (assuming that the road engineers built the darned thing correctly) by an amount equal to the angle of the bank of the road. Decomposing the normal force vector into a horizontal (towards the center of the circle) and a vertical (up towards the sky) shows an increased force upon the car towards the center of the radius of curvature over the case where the road is flat. In the end, it means that the coefficient of static friction that keeps the wheels from sliding radially away from the center of curvature doesn't need to be as high when the road is banked.\n\nAlso note: There is NO SUCH THING AS CENTRIFUGAL FORCE! The car is an accelerating reference frame. Anyone who uses the term "centrifugal force" either has not taken 1st year physics or did not understand it when they did.
799705
OK, below is a list of websites that may give you ideas.  Try a couple of ideas and test them at home before taking them into class?\n\nUsing the clothespin as the main source of energy does not necessarily mean that the spring has to be the main driver of the machine?  It might be used more as a trigger release – thus allowing the clothespin to be the main release of the energy.\n\nGood Luck.
1007337
The KE of the moving vehicle is dissipated as heat in the brakes as the brakes use friction.\n\nThe answer to your second question is that no work has been done and therefore there has been no change in KE.\n\nIn terms of transfer of momentum, the really huge ball called the earth and the car did interact.  If the car started out going West and then ended up going East, the total momentum (angular and linear) between the car and the earth must be conserved.  This means that the earth was caused to change its rotation when the car turned around.  Obviously, the earth is so much bigger than the car that you don't even notice the change in momentum of the earth.
272365
You have a leak in the brake system. Check fluid level, if low check lines near each wheel. Next you will have to pull a wheel off to see if the caliper (front) or cylinder (back) brakes are leaking.\n\nA rear drum brake cylinder can leak and the fluid can be absorbed in to the brake shoe with out leaving evidence on the ground.\n\nAlso, possible air or water in the line which means the brake fluid is contaminated. A complete purge of the system is required. Bleeding the fluid from each wheel as you feed fresh new fluid in.
982443
If the road were not banked, one has to rely only upon the frictional force which provides the necessary centripetal force to turn around a curve.\n\nIf the road is banked, that is tilted to an angle C (called the angle of friction) the frictional force will disappear.\n\nBut the horizontal component of normal reaction will now provide the necessary centripetal force.  \n\nN sin C = M V V / R.\n\nThe vertical component of normal reaction is equal but opposite to the weight of the car.\n\nN cos C = Mg.\n\nDividing the first by second equation,\n\nTan C = V V / (R*g) from which C can be calculated.\n\nB).\n\nTan C = 13.4 x 13.4 / 50 x9.8 \n\n ------------- = 0.3664.\n\nC = 20.1 degree.
1087367
When the car is traveling at 100 mph, everything at rest with in the car is also traveling at 100 mph, this includes you, the air, any any flies present.\n\nWhen you suddenly stop the car, you are not just stopping the car bu also everything inside as well.\nPretty much everything within the car slows down/stops at the same rate (assuming ample "Stopping" forces).  So when you step on the brakes, the fly slows down too, despite the fact that it is not physically connected [strapped down] with the car.\nThe fly does not slam into the windshield for the same reason the back of the car does not turn into a vacuum.\n\n\nEDIT:\n"memento mori", inertia would be a reason why the fly might indeed hit the windshield, not why it might not.\nInterial is the property of matter which says that objects tend to continue doing what they are doing (objects at rest stay at rest, objects in motion stay in motion, ...Newton's 1st law).\nIf the fly was in motion and you slammed on the breaks, the fly should stay in motion, not come to a rest.....unless of course, something did work on the fly (applied a "stopping" force over a distance) in order to change its kinetic energy.
693390
Gravity, centrifugal forces and centripetal forces
823386
Hi Alan the 1st!\nWe neglect the central aperture in CD, then inertia momentum is I=m*r^2/2 for any homogeneous disk, m=0.017kg, r=0.06m. Torq T=I*w’, w’ is angular acceleration, while w=w’*t, w=22 rad/s, t=0.88s, thus T=m*r^2*(w/t)/2, - plug in the proper numbers, be a good boy!
329300
It doesn't. When work is done a small amount of the system's energy is converted to entropy (heat) and is lost to the system (usually through friction).
57335
is due to the movement of a body , when a body is acelerating because it's spinning or something , it causes a drag force that affects the objects on that body ; it's not a ¨real force¨ (like gravity or a spring for example)cause is due to an acceleration; and because Newton's laws are applied only in inertial frames , people came out with this ¨ficticious forces¨( like this one and the centrifugal force for example) so we can be able to apply F=ma also in non inertial frames
825037
For the cork to sink it must raise the water level. Since it must raise the water against the force of the centrifuge - pushing harder on both just doesn't do the job (of sinking the cork).
155890
*is a center-directed force\n\n\nnot "*acts as an unbalanced force on the satellite" because, it is balanced by centrifugal force. \n\nnot "*changes the direction of the satellite" because direction is changed by only tangential forces and not the force acting towards center.