How are solar towers similar to and different from solar trough collectors?
What will be an ideal response?
They both use the sunlight, concentrate it, and use it to heat a working fluid that
circulates through a heat exchanger to run a turbine. The solar troughs are fixed in place,
while the heliostats of the solar towers move to more effectively reflect sunlight onto the
central tower.
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The graph shows the speedometer reading of a car as it comes to a stop along a straight-line path. How far does the car move between t = 0 s and t = 16 s?
A. 130 m
B. 140 m
C. 150 m
D. 160 m
125 g of dry ice (solid CO2) is dropped into a beaker containing 600 g of 64.0°C water. The dry ice converts directly to gas, leaving the solution. When the dry ice is gone, the final temperature of the water is 33.2°C. What is the heat of vaporization of solid CO2? (cwater = 1.00 cal/g/°C)
a. 160 cal/g b. 142 cal/g c. 118 cal/g d. 148 cal/g e. 154 cal/g
Identical 8.0-?C point charges are positioned on the x axis at x = ±1.0 m and released from rest simultaneously. What is the kinetic energy of either of the charges after it has moved 2.0 m?
a. 84 mJ b. 54 mJ c. 96 mJ d. 63 mJ e. 48 mJ
How many molecules of sucrose are in 0.5 L of a 2 molar solution of sucrose?
A) 3.01 × 1023 molecules of sucrose B) 6.02 × 1023 molecules of sucrose C) 12.04 × 1023 molecules of sucrose D) 0.5 E) 1 gram