A4-foot spring measures 8 feet long after a mass weighing 8 pounds is attached to it. the medium through which the mass moves offers a damping force numerically equal to ï2 times the instantaneous velocity. find the equation of motion if the mass is initially released from the equilibrium position with a downward velocity of 5 ft/s. find the time at which the mass attains its extreme displacement from the equilibrium position. what is the position of the mass at this instant?

The plum pudding model of the atom state that ?

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?

What is the relationship between wavelength of light and the quantity of energy per photon?