When referring to the "mks" system what does the "m", the "k", and the "s" stand for?
What will be an ideal response?
meter, kilogram, and second
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What is the difference between energy and power?
A) Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time. B) Power is measured in joules and energy is measured in watts. C) Power is used to describe energy of light, while the term energy has a broader meaning. D) There's no difference: Energy and power are different names for the same thing.
A meterstick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 35-cm and 80-cm marks, respectively. Where should Doug hang a third mass of 0.30 kg to keep the stick balanced?
a. 20 cm c. 30 cm b. 70 cm d. 10 cm
A red crab very deep in water, where sunlight is dim, appears
A) red. B) orange. C) cyan. D) brown. E) no color–black.
Double-Slit Interference: Two thin slits are 6.00 ?m apart. Monochromatic coherent light falls on these slits, and produces a fifth-order bright interference fringe at an angle of 32.3° away from the centerline. What is the wavelength of the light?
A. 164 nm B. 416 nm C. 614 nm D. 641 nm