How will the Kepler mission (scheduled for 2008 launch) look for planets around other stars?
A) It will look for Doppler shifts in stellar spectra.
B) It will be sufficiently powerful to take low-resolution photographs of planets orbiting nearby stars.
C) It will look for slight back and forth shifts in a star's position in our sky.
D) It will look for slight changes in a star's brightness that repeat at regular intervals.
D
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The primary evidence that has led astronomers to conclude that the expansion of the universe is accelerating comes from
A) observations of white dwarf supernovae. B) observations of the speeds of individual galaxies in clusters. C) measurements of the rotation curve for the universe. D) measurements of how galaxy speeds away from the Milky Way have increased during the past century.
The end of a cylindrical plastic rod is polished and cut perpendicular to the axis of the cylinder
Determine the minimum index of refraction so that a light ray entering the end of the rod will always be totally internally reflected within the rod, i.e., it will never escape the rod until it comes to the other end. Assume a critical angle of 45°.
About 1350 W/m2 of electromagnetic energy reaches the upper atmosphere of the earth from the sun, which is 1.5 × 1011 m away
Use this information to estimate the average power output of the sun. A) 1 × 1026 W B) 2 × 1026 W C) 3 × 1026 W D) 4 × 1026 W
A 2.10-kg hammer is transported to the Moon. The radius of the Moon is 1.74 × 106 m, its mass is 7.35 × 1022 kg, and G = 6.67 × 10-11 N ? m2/kg2. How much does the hammer weigh on Earth and on the Moon?
What will be an ideal response?