Which casting technique is appropriate for a very complex metal shape that cannot be removed from a mold?
(a) Sand mold
(b) Permanent mold
(c) Die
(d) Investment
(d) Investment
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Which one of the following properties of the beam of light applies to a laser beam?
A) It is coherent. B) It is incoherent. C) It is diverging. D) It is converging. E) None of the other answers given is correct.
Within a given system, the internal forces
A. are always balanced by the external forces. B. all add to zero. C. are only determined by subtracting the external forces from the net force on the system. D. determine the motion of the system. E. are measured with a gravimeter.
Nonscientific practices that make no claims about how the natural world works do not conflict with science
Indicate whether the statement is true or false
You hit a tennis ball over the net. When the ball reaches its maximum height, its speed is
A) equal to its initial speed. B) less than its initial speed. C) greater than its initial speed. D) zero. E) g?t.