Streak refers to the ________.
scratch created when testing a mineral for hardness
color of a powdered mineral
a mineral's best-developed cleavage direction
color of a powdered mineral
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A charge q1 is placed on the y-axis at y = 4.0 m and the resulting potential at the position (3.0 m, 4.0 m) is 3.0 V. The charge q1 is removed and a charge q2 is placed on the x-axis at x = 3.0 m and the resulting potential at the position (3.0 m, 4.0 m) is 4.0 V. If both charges are in place simultaneously, what is the potential at (3.0 m, 4.0 m)?
A. 1.0 V B. 3.5 V C. 5.0 V D. 7.0 V E. 12 V
There is a main sequence mass-luminosity relation because
a. helium fusion produces carbon. b. stars expand when they become giants. c. more massive stars support their larger weight by making more energy. d. the helium flash occurs in degenerate matter. e. all stars on the main sequence have about the same radius.
Two long parallel wires each carry a current of 5.0 A directed to the east. The two wires are separated by 8.0 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires?
A. 72 ?T B. 48 ?T C. 24 ?T D. 96 ?T E. 32 ?T
An object is placed 10 cm in front of a concave mirror with a 20-cm focal length. Determine the image location (in cm)
a. ?20 b. ?15 c. ?10 d. ?5 e. 6.7