On bracket ABCDEF, each y-direction force acts at the center of the bar segment to which it is applied (see figure). All turns of ABCDEF are 90o angles. The resultant moment at B (MB) for this parallel force system is (in N?m)
(A) 395j 1 1080k
(B) 415i 1 875k
(C) 485i 2 913k
(D) 2485i 1 913k
(D) 2485i 1 913k
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RLC Circuits: A series circuit consists of a 100-? resistor, a 10.0-?F capacitor, and a 0.350-H inductor. The circuit is connected to a 120-V rms, 60-Hz power supply. What is the rms current in the circuit?
A. 0.42 A B. 0.52 A C. 0.62 A D. 0.72 A
The dwarf planet Pluto and its moon Charon are unique in the Solar Systems in that the orbital period of Charon equals the rotation period of Pluto. The synchronous rotation is the result of tidal interaction between them.
Answer the following statement true (T) or false (F)
Which of the following was NOT a contribution of Galileo to astronomy?
A) Sunspots showed the Sun was rotating on its axis, like the Earth does. B) The four moons of Jupiter are a model for the solar system motions in general. C) The phases of Venus prove it orbits completely around the Sun. D) The changing appearance of Saturn's rings corresponds to our seasons. E) The craters and mountains of the Moon prove it a world in its own right.
If your heart is beating at 76.0 beats per minute, what is the frequency of your heart's oscillations?
A) 4560 Hz B) 1450 Hz C) 3.98 Hz D) 2.54 Hz E) 1.27 Hz