One problem that fireplace designers try to solve is how to get more of the fire's heat into the room. Where does the rest of the heat go? Why?

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?

Acar going 30 m/s to 70 m/s in 10 seconds calculate the acceleration of the car

List and describe three ways that humans can change ecosystems and three ways that humans can protect ecosystems.