You are asked to design a metal alloy for a part with a room temperature application. The part is to be made by casting the metal into shape. When casting the part, liquid metal is poured into a mold that has a cavity with the shape of the part. To reduce cost by conserving energy and to utilize an inexpensive furnace that does not have a high temperature capability, it is desired that the metal alloy not have a high melting temperature. What type of metal alloy phase diagrams should you consider first for this part?
(a) Continuous solid solution
(b) Eutectic
(c) Compound formation
(d) Peritectic
(b) Eutectic
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A parallel plate capacitor with an air dielectric is attached to a voltage source and charged. The voltage source is removed, and then the plates are separated to double their previous distance. What happens to the potential difference between the plates when they are separated?
A. it doubles B. it quadruples C. it halves D. it is diminished by a factor of 4 E. it stays the same
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The distance from the starting point in meters is
a. 0. b. 2. c. 4. d. 8. e. 16.
Consider the four U.S. non-renewable energy resources: gas, oil, coal, uranium without recycling for plutonium recovery. Assuming that we used each of these for a major portion of our energy needs, for which ones would domestic U.S
resources run out within some 50 years, and which ones does the United States have in much greater abundance? A) The United States is running out of gas and oil, but has abundant coal and uranium. B) The United States is running out of all four. C) The United States is running out of gas, oil, and uranium, but has abundant coal. D) The United States has abundant supplies of all four of these resources. E) The United States is running out of gas, oil, and coal, but has abundant uranium.
Photovoltaic cells will never be much cheaper than now
What will be an ideal response?