A compass needle in a magnetic field experiences

A) a torque.
B) a net force.
C) both of these
D) none of the above


Answer: A

Physics & Space Science

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Relative Velocity: A boat, whose speed in still water is 8.0 m/s, crosses a river with a current of 6.0 m/s. If the boat heads perpendicular to the current, what is the speed of the boat relative to an observer standing on the shore as it crosses the river?

A. 5.3 m/s B. 6.0 m/s C. 8.0 m/s D. 10.0 m/s

Physics & Space Science

Convection in the outer layers of a star like the Sun helps mixing and makes more hydrogen available for burning.

Answer the following statement true (T) or false (F)

Physics & Space Science

A Carnot engine operates between two reservoirs with unknown temperatures. If the Carnot engine operates at efficiency, what is the ratio of the absolute temperatures of the reservoirs, Tc/Th?

A) 0.33 B) 0.0012 C) 0.0025 D) 0.67

Physics & Space Science

Rocks with a high water content have a

A) higher melting point. B) lower melting point. C) higher pressure. D) lower pressure.

Physics & Space Science