Imagine that at a certain place in a river, water moves horizontally to the left. Consider an oriented sur-face that faces in a direction that is 30° upward of right. The flux of water velocity through this surface is

A. positive.
B. negative.
C. zero.
D. Impossible to determine from the given information


B. negative.

Physics & Space Science

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We expect neutron stars to spin rapidly because they conserve angular momentum

a. True b. False Indicate whether the statement is true or false

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If Sirius transits my local meridian tonight at 6:43 PM, when will it transit tomorrow?

What will be an ideal response?

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The ________ magnitude of a star depends directly upon its luminosity and distance

Fill in the blank(s) with correct word

Physics & Space Science

A 10-kg rock and a 20-kg rock are dropped at the same time and there is no air. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?

A) 4a B) 2a C) a D) a/2 E) a/4

Physics & Space Science