Which of the following are typically found in the halo of our galaxy?
A) open star clusters
B) stars of spectral types O and B
C) globular star clusters
D) cold gas and dust
E) all of the above
C) globular star clusters
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Which statement about this cluster is not true?
A) It contains some stars that are burning helium in their cores. B) It probably contains no young stars at all. C) It is likely to be located in the halo of the galaxy. D) It is likely to be spherical in shape. E) It is the type of cluster known as an open cluster of stars.
An electron is released from rest at the negative plate of a parallel plate capacitor. If the distance between the plates is 5 mm and the potential difference across the plates is 5 V, with what velocity does the electron hit the positive plate? (me = 9.1 × 10?31 kg, qe = 1.6 × 10?19 C.)
What will be an ideal response?
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
a. is independent of velocity or acceleration. b. increases when the velocity increases. c. is proportional to the acceleration. d. decreases when the force parallel to the floor increases. e. increases when the force parallel to the floor increases.
A circular conducting loop falls toward a bar magnet, as shown in the diagram below. 
In which direction does current flow in the loop?
A. Clockwise (when viewed from above). B. Counterclockwise (when viewed from above). C. No current flows in this loop. D. We need more information to answer.