Alfred wegener believed that all of the continents were originally:
a.
a single landmass called pangaea
c.
three landmasses called europe, asia, and gondwana
b.
two landmasses called eurasia and gondwana
d.
none of the above

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s. assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.