51 Pegasi is important because
a. it is a pulsar with planets orbiting around it.
b. it is a star with a planet that is known to support intelligent life.
c. it is the largest satellite of Jupiter.
d. it is the largest known asteroid.
e. it is the first star like our Sun that was found to have a planet orbiting it.
e
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 rad/sec2 acquires an angular velocity of 5.00 rad/sec. The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the angular distance traveled by a point 4.00 cm from the center, at the time 10.0 seconds from the start?
A. 27.6 rad B. 37.5 rad C. 40.7 rad D. 48.2 rad E. 51.2 rad
Trilobites lived during which era?
a. Paleozoic b. Cenozoic c. Mesozoic d. Archeozoic
When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to
A) 1.0 N. B) 4.0 N. C) 16 N. D) 0.25 N. E) 0.063 N.
Which of the following methods uses astrometry to detect extrasolar planets around other star systems?
A) detection of Doppler shifts in the spectra of the parent stars B) detection of reflected starlight C) detection of brightness changes in a star as a planet passes in front of it D) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky