Which explanation of the solar system best fits the observations of the planets and how they orbit the sun?
a. the gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets
b. the planets formed at the center of a collapsing spinning cloud of gas and dust
c. the sun and planets formed from a collapsing spinning cloud of gas and dust.
d. a comet hit the sun and sent off fragments the became the planets.
i'm pretty sure it's c?

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?