A compass needle points to the north because
A. the needle is magnetic and the Earth is not.
B. the Earth has strong gravity and the needle has weak gravity.
C. the Earth is like a big magnet and the needle is not magnetic.
D. both the Earth and needle are magnetic.

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.