When considering light as made up of individual "pieces," each characterized by a particular amount of energy, the pieces are called
A) photons.
B) wavicles.
C) gamma rays.
D) frequencies.
A) photons.
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The figure shows two 1.0 kg-blocks connected by a rope. A second rope hangs beneath the lower block. Both ropes have a mass of 250 g. The entire assembly is accelerated upward at 2.3 m/s2 by force . What is the tension at the top end of rope 1?
A) 18 N B) 15 N C) 2.9 N D) 3.5 N
Which is the latest stage of a star?
A) Helium collects within the core. B) Carbon collects within the core. C) The surface of the star expands into a red giant. D) The star contracts into a blue giant.
Two large equipotent surfaces are flat and parallel and separated by a relatively small distance compared to their size. One surface is at 25.0 V and the other is at 33.0 V. The surfaces are 1.25 cm apart. What is the magnitude of the electric field midway between the surfaces?
A. 25.0 V/m
B. 29.0 V/m
C. 33.0 V/m
D. 
E. 
Special relativity predicts that the observed mass of a moving particle depends on its ____
a. inertia b. curvature c. velocity d. force e. true position