Just as a sustained flow of water in a hydraulic circuit needs a pump, the flow of charge in an electric circuit needs
A) current.
B) voltage.
C) resistance.
Answer: B
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__________is a possible form of dark energy that can change in strength as the Universe ages
A) Microwave B) Quintessence C) Isotope D) Redshift
The node of a standing wave represents a point of
A. no motion B. maximum motion
Gravitational Force: As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon? The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 0.24 N B. 0.024 N C. 0.0024 N D. 0.00024 N
You drop a stone down a well. You hear the splash 2.23 s later. How deep is the well? The speed of sound in air is 343 m/s
A) 6.96 m B) 20.2 m C) 22.9 m D) 18.8 m E) 20.0 m