Radiation pressure: The intensity of solar radiation near the earth is 1.4 kW/m2. What magnitude force does this radiation exert when it strikes at right angles to a 5.0-m2 perfectly reflecting solar panel of an artificial satellite orbiting the earth? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
4.7 × 10-5 N
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When a charged particle is moved along an electric field line,
a. the electric field does no work on the charge. b. the electrical potential energy of the charge does not change. c. the electrical potential energy of the charge undergoes the maximum change in magnitude. d. the voltage changes, but there is no change in electrical potential energy. e. the electrical potential energy undergoes the maximum change, but there is no change in voltage.
The most important event during the Cambrian period was the
A) emergence of the fishes. B) ability of organisms to form an outer skeleton. C) emergence of the trilobite. D) ability of organisms to develop lungs.
A machinist needs to punch a 5.0-cm-radius hole in a steel plate which is 0.45 cm thick. If the ultimate shear strength of steel is 2.50 × 10^8 Pa, what is the force required to accomplish this task?
a. 8.8E+5 N b. 3.5E+5 N c. 5.6E+6 N d. 1.1E+8 N
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(4x)cos(3t), where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
A. 0.75 B. 0.25 C. 1.3 D. 12 E. 3.0