What causes the magnetic field around the wire? Magnetic field
O A. An electric current
O B. An electric field
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What is the earliest point in the universe that we can observe? why can’t we see back further than this?

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of