43. A mother pushes her 120-newton child, who is
sitting on a swing. If the mother exerts a
10.-newton force on the child for 0.50 second,
wiat is the magnitude of the impulse imparted
to the child by the mother?
A) 5.0 Nos
B) 20. N/s
C) 60. Nos D ) 240 N/s
44 A 15-newton forca acto por 10

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?