A fourth seismic station is located 5000 kilo- meters from this epicenter. How long after
the P-waves did the S-waves arrive at the
fourth station?

How would doubling the made of an object change the objects potential energy

Which one of the following terms is used to indicate the natural tendency of an object to remain at rest or in motion at a constant speed along a straight line? velocity acceleration equilibrium force inertia

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?