Which of the following is an organic molecule?
A) N2H4
B) B2O2
C) C2H4
D) H2O2
C
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A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. Buoyant force on the rock is
A) 2 N. B) 3 N. C) 4 N. D) 5 N.
In the formula
Balmer found that for the visible lines in hydrogen that nf=_______.
A. 1 B. 2 C. 3 D. 4 E. 5
A copper pipe is held vertically and a magnet is dropped down the pipe. The magnet is oriented with the north pole down. What direction do the Eddy currents flow as viewed from above the pipe? If copper bar of approximately the same size and weight is dropped down the tube will it fall faster or slower?
A. CCW above the magnet and CW below the magnet; copper bar will fall slower B. CCW above the magnet and CW below the magnet; copper bar will fall faster C. CW above the magnet and CCW below the magnet; copper bar will fall slower D. CW above the magnet and CCW below the magnet; copper bar will fall faster
A ball is thrown upward and caught when it returns. When air resistance affects the ball, compared with the initial upward speed, the speed of the ball when caught is
A) less. B) the same. C) more.