A 500 g box is pulled by a force over a horizontal surface. The coemelent of kinetie trietien between the surface and the box is 0.31; pulling force has a magnitude of 채 N and is parallel to the surface. What is the magnitude of the friction foree acting on the boxt
a. 0.16 N
b. 1,5 N
c. 1.7 N
d. 4.6N
e. N 67.
What is the acceleration of the box?
a. 0.16 m/s
b. 1.5 m/s
c. 1.7 m/s
d. 4.6 m/gt
e. 3.8 m/g

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?