Aluminum (Group III) and silicon (Group IV) are adjacent to each other in the periodic table. Relative to aluminum silicon is less dense, has a higher melting temperature, is harder, and is very prevalent in the sand and rocks of the Earth’s crust. And yet aluminum has many more mechanical applications, such as in the structure and skin of aircraft, the cylinder heads in automobile engines, small boats, and marine engines. We will cover this later in the book, but from what you know about metals, such as aluminum, what property results in the use of aluminum in these applications rather than silicon?
What will be an ideal response?
ductility
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A slit of variable width illuminated by light of wavelength ? is widened until the first order diffraction minimum moves out to a distance infinitely far away from the brightest location in the central maximum. In terms of the wavelength, the width of the slit is then
A.
B.
.C.
D.
.E.
Diffraction is least when illumination is with
A) red light. B) blue light. C) an electron beam D) none of the above
The inductive reactance of an RLC circuit is 36
If the frequency is doubled, what is the new inductive reactance?
A. 72
B. 36
C. 19
D. 6.0
E. 3.0
Work-Energy Theorem: The graph in the figure shows the magnitude of the net horizontal force Fx on a 25-kg package as a function of the position x of the package. Just before the force was applied, the package was originally sliding at 6.0 m/s in the +x direction on a smooth horizontal floor. Find the x component of the velocity of the package just after the force has stopped in each of the following cases.(a) The force is applied in the same direction as the original velocity of the box.(b) The force is applied in the opposite direction to the original velocity of the box.
What will be an ideal response?