The pressure of air in your house can stay constant during the day if the temperature rises. let the temperatures be 295 k during the day, and 288 k at night, and volume of the house be 900 m3. part a determine the number of moles of air that leave the house during the daytime.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

How is the gravitational force related to the distance between two objects?

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?