The bright photosphere is much hotter than the faint corona
Indicate whether the statement is true or false
FALSE
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How does the Kepler mission plan to detect Earth-like planets around other stars?
A) by measuring the Doppler shift in spectral lines as the central star is tugged to and fro by the planet B) by observing the slight dip in brightness of the central star as the planet transits C) by directly imaging the planet D) by observing the spectrum of the planet E) by measuring the slight shift in position of the central star as it is tugged to and fro by the planet
A thin-walled spherical tank has a diameter of 0.75 m and an inter-nal pressure of 20 MPa. The yield stress in tension is 920 MPa, the yield stress in shear is 475 MPa, and the factor of safety is 2.5. The modulus of elasticity is 210 GPa, Poisson’s ratio is 0.28, and maximum normal strain is 1220 3 1026. The minimum permissible thickness of the tank is approximately:
(A) 8.6 mm
(B) 9.9 mm
(C) 10.5 mm
(D) 11.1 mm
Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude?
A) It has a coma and tail during most of each orbit. B) It came from the Kuiper belt. C) It has been on its current orbit for only a very short time compared to the age of our solar system. D) It came from the Oort cloud.
All points on the perpendicular bisector of the line joining two equal but opposite charges have a potential of zero
Indicate whether the statement is true or false