Someone that knows physics and can explain please help. (IF YOU DO NOT KNOW DO NOT ANSWER IM NOT TRYING TO BE PICKY JUST TIRED OF PEOPLE GIVING RANDOM ANSWERS)

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?

Sound travels slower in colder air that it does in warmer air. make a claim about the effect of air temperature on the speed of sound. support your claim with evidence

What is the volume of 2400kg of gasoline (petrol) if the density of petrol is 0.7g/km3