As the solar nebula contracts it
A) flattens out into the ecliptic plane around the Sun's poles.
B) spins faster due to conservation of angular momentum.
C) cools due to condensation.
D) loses angular momentum.
E) reverses it direction of rotation.
B
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An object moving at a constant speed requires 6.0 s to go once around a circle with a diameter of 4.0 m. What is the magnitude of the instantaneous acceleration of the particle during this time?
A. 2.2 m/s2 B. 2.7 m/s2 C. 3.3 m/s2 D. 3.8 m/s2 E. 4.4 m/s2
An iron robot falls from rest at a great height. Neglecting air resistance, what distance has it fallen in the first 3.5 seconds?
A. 49 m B. 60 m C. 98 m D. 31 m
Which of the following statements about large-scale structure is probably not true?
A) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall. B) Galaxies and clusters have grown around tiny density enhancements that were present in the early universe. C) Voids between superclusters began their existence as regions in the universe with a slightly lower density than the rest of the universe. D) Many cluster and superclusters are still in the process of formation as their gravity gradually pulls in new members.
Light waves are
A) beams of moving electrons and other charged particles. B) beams of moving atoms. C) traveling disturbances in an electromagnetic field. D) traveling disturbances in the ether. E) traveling disturbances in the air.