In a solar hot-water system, the hot-water tank is maintained at 130°C. It is desired to have the solar heater heat the feed water going into the tank to 180°C. Determine the amount of heat per kilogram of water required from the solar heater to heat the water from 130°C to 180°C. Assume that the hot-water heater runs at constant pressure.
What will be an ideal response?
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Force on a Moving Charge: A proton has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component
A. to the west. B. to the east. C. upward. D. downward. E. to the north.
We suspect that quasars are the active centers of galaxies because
a. "fuzz" around the central luminous regions produces spectra like a collection of normal stars.. b. a few quasars have large red shifts. c. the central regions of some quasars fluctuate rapidly. d. all of the above e. none of the above
A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point does the magnitude of the vertical component of velocity have its minimum value? (air resistance is negligible)
a. just after leaving the center fielder's hand b. just before arriving at the catcher's mitt c. at the top of the trajectory d. magnitude of vertical component of velocity is constant
The primary factor that makes magmas different from one another is
What will be an ideal response?