As a hiker descends a hill, the work done by gravity on the hiker is
A. positive and depends on the path taken.
B. negative and depends on the path taken.
C. positive and independent of the path taken.
D. negative and independent of the path taken.
C. positive and independent of the path taken.
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When a planet the size of Jupiter passes in front of a star the size of our Sun, the drop in the intensity is about _____ percent.
A. 1 B. 2 C. 3 D. 4
Water is flowing through a pipe whose cross sectional area at point A is larger than the cross sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be __________ the reading on a pressure gauge connected to the pipe at point B
Fill in the blank(s) with correct word
The 1920s represents the dawn of commercial radio. How would those investors interested in the new technology decided what growth possibilities there were? Would knowledgeable investors have drawn straight lines on regular or on semilogarithmic
graph paper? Why?
Velocity Selector: A beam of electrons is accelerated through a potential difference of 1.0 kV before entering a velocity selector. If the magnetic field of the velocity selector has a magnitude of 0.010 T, what magnitude of the electric field is required if the electrons are not to be deflected as they pass through the velocity selector? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31 kg)
A. 5.9 × 103 V/m B. 1.9 × 105 V/m C. 6.0 × 105 V/m D. 7.2 × 106 V/m E. 1.1 × 105 V/m