Water flowing in a pipe is similar to electric current flowing in a circuit. Which concept in the water flow system is analogous to the charge in an electric circuit?
a) Pump
b) water
c) valve
d) pressure
b) water
Water flowing in a pipe is similar to electric current flowing in a circuit. Which concept in the water flow system is analogous to the battery in an electric circuit?
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Three point charges are placed on the x-axis. A charge of +2.0 ?C is placed at the origin, -2.0 ?C to the right at x = 50 cm, and +4.0 ?C at the 100 cm mark
What are the magnitude and direction of the electrostatic force that acts on the charge at the origin? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) What will be an ideal response?
Why were scientists surprised when they first discovered the existence of planets with Jupiter-like masses orbiting close to their stars (the "hot Jupiters")?
A) The nebular theory predicts that jovian planets should only form at much larger distances from their stars. B) The surface temperatures of these planets seemed inexplicably high. C) They had expected to detect small, terrestrial planets before large, jovian planets. D) The orbits of these planets did not follow Kepler's laws of planetary motion.
Most naked-eye stars would fall to the top left on the H-R diagram
Indicate whether the statement is true or false
An ideal Carnot engine operates between reservoirs having temperatures of 125°C and -20°C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00°C
The heat of fusion of water is 3.34 × 105 J/kg and the heat of vaporization of water is 2.25 × 106 J/kg. (a) How much work does this engine do each cycle? (b) How much heat per cycle does this engine absorb at the hot reservoir?