A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 12 rev/s. 50 revolutions later, its angular speed is 16 rev/s. (a) Calculate the angular acceleration. rev/s2 (b) Calculate the time required to complete the 50 revolutions mentioned. s (c) Calculate the time required to attain the 12 rev/s angular speed. s (d) Calculate the number of revolutions from rest until the time the disk attained the 12 rev/s angular speed.

Acyclotron is used to produce a beam of high-energy deuterons that then collide with a target to produce radioactive isotopes for a medical procedure. deuterons are nuclei of deuterium, an isotope of hydrogen, consisting of one neutron and one proton, with total mass 3.34×10−27kg. the deuterons exit the cyclotron with a kinetic energy of 6.40 mev .a-what is the speed of the deuterons when they exit? b-if the magnetic field inside the cyclotron is 1.25 t, what is the diameter of the deuterons' largest orbit, just before they exit? c-if the beam current is 350 μa how many deuterons strike the target each second?