Explain why black holes in binary systems are associated with strong, steady X-ray emission
What will be an ideal response?
In a binary system, the black hole can attract material from the companion star which will form an accretion disk. Due to the strong gravitational field near the event horizon, the gas in the disk will become hot enough to emit primarily in X-rays
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A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye
(a) Is she nearsighted or farsighted? (b) What is her far point without glasses?
Why does quartz sandstone have a high porosity and a high permeability?
What will be an ideal response?
A steel part must withstand 4000 cycles of a stress of 0 to 500 MPa. The steel has a KIc of 200 MPa·m1/2.
Laboratory tests have shown that the crack growth rate for this stress cycle follows the relationship da/dN=A(?K)6, where A is equal to 2.5×10-14 in units of MPa and meters. (a) With this stress cycle, what is the critical crack length for failure of the steel, assuming an internal crack with Y=1? (b) What is the minimum detectable crack length required of the nondestructive inspection equipment to guarantee the 4000-cycle fatigue life?
Series/Parallel Circuits: As more resistors are added in parallel across a constant voltage source, the power supplied by the source
A. increases. B. decreases. C. does not change. D. increases for a time and then starts to decrease.