A person riding a bike at a certain speed doesn't fall,but a person siting on a stationary bike falls?
607437
Actually it is a bot more complicated than those answers would show.\n\nThe spinning wheels cause a gyroscopic effect which makes it easier to balance.
702361
ok biker bike, here we go.\n\nacc.= g = 9.8 m/s2, (any object moving in air will have this acc. or retardation)\n\nb) we apply formula\ns=ut + 1/2at^2\nu=20\nt=4\ns=20*4 + 1/2 *9.8 *4*4\n  =158.4 m\n\nc) v=u + at\n  therefore, t= v-u/a\n                   =50-20/9.8\n                   =3 seconds (approx)
1048704
yes. the fact that he is still on the ground means that some force is holding him down which would be gravitational force. if there was no graviatational force then he would be 'floating' in the air as if in outer space.
148681
Only objects of the same mass (Weight) fall at the same speed. Objects of different size (Shape) can fall at different speeds.
153350
This problem employs the simple concept of conservation of energy (athough there are a number of ways to solve it).\n\nBasically, the person in the wheel chair has an initial kinetic energy at the bottom of thr ramp,\nKE = 1/2 mv^2\nAt the top of the ramp, some of that kinetic energy has been transfered into Gravitational Potential Energy,\nPE = mgh\n\nSince the mass of the person is constant, that drops out of the equation.\n\nSolve for the change in PE and subtract this from the intial KE.  Using the new KE, solve for the final velocity.
722743
A person with increased muscle mass will tend sink.Those with a higher body fat percentage will tend to float.
554892
(m)\n\nRain falls at an average of seven miles per hour
212614
the wall stops it and the ground starts it again. if the spinning force is greater than the stopping force it would continue to spin after hitting the wall.
759986
both will have same weight mass
449872
The both weigh the same
71249
Neither, they both weigh exactly the same. One pound.
794040
This is really a calc question.\n\nAn item will fall at 32ft per sec per sec from a rest.\nh - the free fall = t\n\n2. As it is stated the axle is frictionless, therefore the cyinder and axle will move and there is no force between the two. However there is a force between the rope and or bucket and the cylinder.\n\ndouble check the 32ft/s in your book, there may be more to the equation.\n\nCarl
990047
during motion the wheel turns into a gyroscope. A body when rotating about an axis certain energy is associated with it. When you u try to change this axis of rotation energy is required for it. So when a bike is in motion the wheels act as gyroscopes n the tru to resist any change in this orientation(vertical). So it does not fall.  \n\nThis fact can further b established as when u make a turn the bike inclines along the turn. this is bcoz while turning we are changing the axis of rotation of wheels. the energy required for this purpose is drawn by bending the bike
928537
not at all, the material weight is just taking different forms, a person is a composition of something already here, there is not heavier planet.\n\n:> peace\n.
489652
No, the opposite. A person is lighter at the equator because of the centrifugal force generated by the Earth's rotation.
675679
you'd fall very quickly and then go past the centre towards the surface at the other side.\nThen you'd start to fall back to the centre and go back to the other side.\nThis is basically how a pendulum works.\nBy the way.. there should be free fall at the centre of the earth... I.e. no gravity.
200232
depends on the kind of fall and the trajectory