two masses m and m are hung over a massless frictionless pulley as shown below. if m > m, what is the downward acceleration of mass m

Which describe reflection? check all that apply. light bounces off a boundary.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.