A proton moves in a circular path of the same radius as a cosmic ray electron moving at 6.5 × 10^6 m/s perpendicular to the Earth’s magnetic field at an altitude where the field strength is 1.0 × 10^(-5) T.
What is the radius of the circular path the electron follows?

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.