A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together.
(a) What is the speed of the wreckage just after the collision? (b) In what direction does the wreckage move just after the collision?
Question 2
Four point charges, each of charge 2.5 x 10-5, are located on the x- and y-axes, one at each of the locations (0, 2.0 m), (0, -2.0 m), (2.0 m, 0), and (-2.0 m, 0). The potential at the origin is
A)
2.3 105 V.
B)
4.5 105 V.
C)
3.5 105 V.
D)
1.1 105 V.
E)
0.
Species richness of birds in North America.
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