A beam of protons enters a uniform 0.01 T magnetic field normal to the beam's velocity. If the mass of the proton is 1.67x10-27 kg, then the
period (in us) of rotation of a proton in its circular path is:

true

explanation:

do you have a formula possibly

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )

not too sure thinking all accelerations are pointed down