Contrast the densities of the terrestrial planets and comets
What will be an ideal response?
Forming close to the Sun, terrestrials are denser, with iron and silicates as major components. Far out beyond the ice limit, the jovians are far less dense, with compositions much like the gases of the Sun.
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Which of these is true of planetary nebulae?
A) They are the material which causes the eclipses in eclipsing binary systems. B) They are rings of material around protostars that will accrete into planets in time. C) They are the envelopes that form when blue stragglers merge. D) They are expelled by the most massive stars in their final stages before supernova. E) They are ejected envelopes surrounding a highly evolved low-mass star.
Treat each of your eyes as a circular aperture of diameter 3.5 mm. Light of wavelength 500 nm is used to view two point sources that are 283 m distant from you
How far apart must these two point sources be if they are to be just resolved by your eye? Assume that the resolution is diffraction limited and use Rayleigh's criterion.
A jet plane flying 600 m/s experiences an acceleration of 4.0 g when pulling out of the circular section of a dive. What is the radius of curvature of this section of the dive?
A) 1.2 km B) 5.8 km C) 0.64 km D) 9.2 km E) 7.0 km
When charges qa, qb, and qc are placed respectively at the corners a, b, and c of a right triangle, the potential at the midpoint of the hypotenuse is 20 V. When the charge qa is removed, the potential at the midpoint becomes 15 V. When, instead, the charge qb is removed (qa and qc both in place), the potential at the midpoint becomes 13 V. What is the potential at the midpoint if both charges qa
and qc are removed? a. 13 V c. 5 V b. 7 V d. 8 V