______________ (how many?) tidal bulges "move" around Earth daily
Fill in the blank(s) with correct word
Two
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Spreading centers are marked by mid-ocean ridges where hot mantle material rises upward and then spreads sideways
Indicate whether the statement is true or false
When a dielectric material is introduced between the plates of a parallel-plate capacitor and completely fills the space, the capacitance increases by a factor of 4. What is the dielectric constant of the material that was introduced?
A) 0.4 B) 1/4 C) 2 D) 4 E) None of the other choices is correct.
A uniaxial composite material is made from 75 vol % continuous kevlar fibers and 25 vol % epoxy. The kevlar fibers have an elastic modulus of 131×109 Pa and a tensile strength of 4.0×109 Pa. The epoxy resin has an elastic modulus of 5×109 Pa and a tensile strength of 50×106 Pa. The composite must withstand an axial stress of 0.5×109 Pa and a transverse stress of 4×106 Pa. The axial and transverse stresses are not applied simultaneously. Assume that both the kevlar fibers and the epoxy matrix are elastic up to their failure.
(a) Determine the elastic modulus in the axial direction of this composite material. (b) Determine the elastic modulus in the transverse direction of this composite material. (c) Determine the axial strain in the composite due to the axial stress alone. (d) Determine the stresses in the fibers and in the matrix for the axial stress. (e) Can each of the components of this composite withstand the axial stress, and if not, what is the fracture stress? (f) What is the transverse fracture stress? Can the composite withstand the transverse stress applied alone?
Light from an object near the event horizon received by a distant observer is ________
Fill in the blank(s) with correct word