Peak values for a neodymium-glass laser are 600 J for 1.00 nanosecond. If the cross-section of the laser beam is 1.10 cm2, what are the maximum values of E and B? (µ0 = 4? × 10^?7 T?m/A, c = 3.00 × 10^8 m/s)
a. 2.0E+9 V/m, 1.9 T
b. 5.7E+8 V/m, 6.8 T
c. 2.0E+9 V/m, 6.8 T
d. 5.7E+8 V/m, 1.9 T
e. Not enough information.
c
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Why is it so difficult to take pictures of extrasolar planets?
A) Extrasolar planets give off light at different wavelengths than planets in our solar system. B) No telescope is powerful enough to detect the faint light from a distant planet. C) Their light is overwhelmed by the light from their star. D) Telescopes are too busy with other projects.
A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the opposite direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.
What is the density of a mixture of 90% air 
and 10% helium (density of 0.180 
a. 
b. 
c. 
d. 
e. 
If an antimatter meteor of mass m were to strike the Earth, the amount of radiant energy produced would be
A) less than mc2. B) mc2. C) 2mc2. D) none of the above