A _____ is a large system of stars, star clusters, gas, dust, and nebulae orbiting a common center of mass
A) galaxy
B) spiral arm
C) planet
D) solar system
A
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_____ consists of chemical processes involving natural selection of complex molecules prior to the origin of life
A) Chemical engineering B) Chemical synthesis C) Chemical treatment D) Chemical evolution
Rotational Dynamics: A uniform solid cylinder of mass 10 kg can rotate about a frictionless axle through its center O, as shown in the cross-sectional view in the figure. A rope wrapped around the outer radius R1 = 1.0 m exerts a force of magnitude F1 = 5.0 N to the right. A second rope wrapped around another section of radius R2 = 0.50 m exerts a force of magnitude F2 = 6.0 N downward. How many radians does the cylinder rotate through in the first 5.0 seconds, if it starts from rest?
A. 13 rad B. 7.5 rad C. 5.0 rad D. 10 rad
A student lifts a weight of 10.0 N a distance of 0.5 meters. If this exercise is repeated 50 times in 100 seconds, then the power of this exercise is
A. 2.5 Watts. B. 3.1 Watts. C. 3.6 Watts. D. 4.0 Watts. E. 4.8 Watts.
A 25.0-mH inductor is connected in series to a 20.0-? resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the time constant of this circuit?
A) 0.800 × 10-3 s B) 0.800 × 10-2 s C) 0.500 s D) 1.25 × 10-3 s E) 12.5 × 10-2 s