You're in a car that gets 28 miles per gallon of gas, driving it at a constant speed. if you took the gas from the car tank, and instead filled a long cylinder or hose alongside the car's path, what would the diameter of the hose need to be?

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

What are the necessary conditions for fusion?

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?