What is the product of 12.56 and 2.12?
A)
27
B)
26.6
C)
26.23
D)
26.627
E)
26.6270
B
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The electrons in a cloud of hydrogen gas are making the transitionfrom excited states tothe ground state. What does the spectrum of this cloud of gas lookalike?
a) It will be completely black at all wavelengths. b) It will be bright at every wavelength, giving off some radio waves, some visible light,and X-rays. c) It will consist of a few bright emission lines at very specific wavelengths. d) It will be bright at most colors, but with some dark absorption linesat very specific wavelengths. e) It will be identical to the spectrum of the Sun.
An 80. kg man is skating Northward and happens to collide with a 20. kg boy who is ice skating toward the East. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction 60 degrees North of East
How fast was the boy moving before the collision?
What must be the diameter of a cylindrical 120-m long metal wire if its resistance is to be 6.0 ?? The resistivity of this metal is 1.68 × 10-8 ? ? m
A) 0.065 mm B) 0.65 mm C) 0.65 cm D) 0.325 mm E) 0.0325 mm
Newtonian physics tells us that Kepler's second law is a result of the conservation of ____
a. angular momentum b. linear acceleration c. energy d. mass e. velocity