Electric charge is measured in units of
a. coulombs.
b. watts.
c. volts.
d. newtons.
a
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Power: Two cyclists who weigh the same and have identical bicycles ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob. Ignoring friction and wind resistance, which one of the following statements is true?
A. The amount of work done by Joe is equal to the amount of work done by Bob, but the average power exerted by Joe is greater than that of Bob. B. The amount of work done by Joe is greater than the amount of work done by Bob, and the average power exerted by Joe is greater than that of Bob. C. Bob and Joe exerted the same amount of work, and the average power of each cyclist was also the same. D. The average power exerted by Bob and Joe was the same, but Joe exerted more work in getting there.
A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
What happens to energy in the Sun's convection zone?
A) Energy is produced in the convection zone by thermal radiation. B) Energy is transported outward by the rising of hot plasma and sinking of cooler plasma. C) Energy slowly leaks outward through the radiative diffusion of photons that repeatedly bounce off ions and electrons. D) Energy is produced in the convection zone by nuclear fusion.
Eukaryotes
A) are made of two cells fused together B) are all unicellular C) can be unicellular or multicellular D) are all multicellular