Which of the following was NOT one of the problems faced by the delegates at the Constitutional Convention of 1787?
A. many of the delegates arriving over a week late
B. an unusually hot summer resulting in heated tempers during debates
c. widely divergent visions for the future of the United States of America
D. a slave rebellion that nearly resulted in the destruction of Independence Hall

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?