A train is traveling due south at a constant

velocity of 86 mi/h. Any unbalanced force
acting on the train with respect to the Earth’s
surface must be
a)zero.
b)directed vertically upward.
c)directed toward the south.
d)directed vertically downward.


a

Physics & Space Science

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Radiation Activity: A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 ?Ci? (1 Ci = 3.7 × 1010 Bq)

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Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the water pressure greatest?

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