Georges-Louis de Buffon was the first to propose that the Sun and planets formed when a large vortex contracted and condensed
a. True
b. False
Indicate whether the statement is true or false
False
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You observe a star cluster with a main-sequence turnoff point at spectral type G (the same spectral type as the Sun). What is the approximate age of this star cluster?
A) 10,000 years B) 4.6 billion years C) 10 billion years D) 100 billion years E) 10 million years
A blob of material in outer space moves at 3 m/s when it collides and sticks to a half-as-massive blob initially at rest. Compared with the initial kinetic energy of the 3-m/s blob, the kinetic energy of the coupled blobs is
A) one-third.
B) two-thirds.
C) three-quarters.
D) not enough information
Graphical Interpretation of Work: A force acts on an object, causing it to move parallel to the force. The graph in the figure shows this force as a function of the position of the object. How much work does the force do as the object moves from 4 m to 6 m?
A. 20 J B. 30 J C. 0 J D. 40 J E. 70 J
What effect, if any, does increasing the capacitance in an RC circuit have on the charging of the capacitor?
a) The capacitance has no effect on the charging of the capacitor, which is determined by the emf of the battery and the circuit resistance. b) Increasing the capacitance causes the charging time to increase since the rate at which charges are moving to the capacitor increases. c) The charging time will decrease as the capacitance is increased because the rate at which charges are moving to the capacitor decreases. d) Increasing the capacitance increases the charging time since the capacitor can hold more charge. e) Increasing the capacitance decreases the charging time since the emf of the battery will be reduced.