Earth's radius is 6.38 × 106 m, and it completes one revolution every day. What is the tangential speed of a person standing on the equator?
A) 232 m/s
B) 148 m/s
C) 464 m/s
D) 21.5 m/s
E) 73.8 m/s
C
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Mars is often called a "midway world," similar in some respects to Earth, and in others to our Moon. Explain
What will be an ideal response?
Peak values for a neodymium-glass laser are 1200 J for 1 nanosecond. If the cross section of the laser beam is 1 cm2, what are the maximum values of E and B? (µ0 = 4p × 10^-7 T×m/A, c = 3.00 × 10^8 m/s)
a. 3 × 10^7 V/m, 2 T c. 1 × 10^10 V/m, 3 T b. 2 × 10^8 V/m, 10 T d. 3 × 10^9 V/m, 10 T
Radiation pressure: The total electromagnetic power emitted by the sun is 3.8 × 1026 W. What is the radiation pressure it exerts on the perfectly absorbing surface of a satellite near the orbit of Mercury, which is 5.8 × 1010 m from the sun? The radiation strikes the surface of the satellite perpendicular to the surface. (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
The emergency blankets in some first-aid kits consist of very thin Mylar that has been coated with aluminum to make it shiny. How can such thin plastic be a blanket? Which mechanism of a person’s heat loss is most effectively suppressed by the blanket?
A. Conduction B. Convection C. Radiation