How much current must pass through a 400-turn ideal solenoid that is 4.0 cm long to generate a 1.0-T magnetic field at the center? (?0 = 4? × 10-7 T ? m/
A)
A) 0.013 A
B) 13 A
C) 22 A
D) 40 A
E) 80 A
E
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Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The work you do on the crate is Fv
Indicate whether the statement is true or false
You are asked to design a metal alloy for use in salt water. The most important design parameter is corrosion resistance followed by other mechanical properties such as yield strength. It is known that dissimilar metals in contact in salt water can result in corrosion of one of the materials. What type of metal alloy phase diagrams should you consider first for this application?
(a) Continuous solid solution (b) Eutectic (c) Compound formation (d) Peritectic
Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are halved, and their separation is also halved, then what happens to the electrical force between these charges?
A) It increases by a factor of 16. B) It increases by a factor of 8. C) It is doubled. D) It is quadrupled. E) It remains the same.
Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on
flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength ? = 550 nm, a wavelength which is near the middle of the visual spectrum.