An ice skater rotating on frictionless ice brings her hands into her body so that she rotates faster. which, if any, of the conservation laws hold? (a) conservation of mechanical energy and conservation of angular momentum (b) conservation of mechanical energy only (c) neither conservation of mechanical energy nor conservation of angular momentum (d) conservation of angular momentum only

If jesus walked on water, does that mean he swims on land

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc