Which two renewable energy resources provide the largest amount of energy today?
A) hydroelectric and wind
B) hydroelectric and biomass
C) active solar and photovoltaics
D) photovoltaics and wind
E) biomass and active solar
B
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A simple magnifying glass has a focal length of 6.0 cm. An object is placed 4.0 cm from it. Sketch a ray diagram and give the characteristics of the image
A wave that requires a medium through wave which to travel
a) Electromagnetic wave b) Mechanical wave c) Longitudinal wave d) Transverse wave
Pennies used to be made of copper, but now they are made of copper-coated zinc. If one were to do a precise calorimetry experiment to determine the specific heat of the new pennies, what would the result be?
a. It would be that of copper since copper is on the outside. b. It would be that of zinc since zinc is in the center. c. It would be the sum of the copper and zinc specific heats. d. It would be between that of copper and that of zinc, depending on coating thickness.
In a certain electroplating process gold is deposited by using a current of 14.0 A for 19 minutes. A gold ion, Au+, has a mass of approximately 3.3 × 10-22 g. How many grams of gold are deposited by this process?
A) 33 g B) 16 g C) 22 g D) 28 g E) 97 g