When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand is
A) zero.
B) 1500 N.
C) 3000 N.
D) 6000 N.
Answer: C
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Total lunar eclipses always occur
a. at the time of new Moon. b. at the time of full Moon. c. during either equinox. d. during either solstice. e. at the time that the Sun is directly overhead.
The ozone layer is found within which of Earth's atmospheric layers?
A. ionosphere B. troposphere C. terrasphere D. stratosphere E. ozone layer
The gases at the interior of the Sun are in a state of plasma, i.e., an ionized gas.
Answer the following statement true (T) or false (F)
A 360-nm thick oil film floats on the surface of a pool of water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively
When the surface of the oil is illuminated from above at normal incidence with white light, what is the wavelength of light between 400 nm to 800 nm wavelength that is most weakly reflected? A) 520 nm B) 540 nm C) 560 nm D) 580 nm E) 600 nm