A curved portion of highway has a radius of curvature of 65 m. As a highway engineer, you want to bank this curve at the proper angle for a steady speed of 22 m/s
(a) What banking angle should you specify for this curve? (b) At the proper banking angle, what normal force and what friction force does the highway exert on a 750-kg car going around the curve at the proper speed?
(a) 37° (b) 9200 N (normal force), 0 N (friction)
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What eventually halts the gravitational collapse of an interstellar gas cloud that forms a brown dwarf rather than a true (main-sequence) star?
A) The central object becoming hot enough to sustain nuclear fusion in its core B) Degeneracy pressure caused by the high density of electrons in the core C) Thermal pressure from the high core temperature D) The onset of convection in the object's outer layers
A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called
a. an oxidizing agent. b. a catalyst. c. an activation agent. d. a reducing agent.
A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decrease if the distance between the plates is increased while they are still connected to the battery. Gertie says that the charge will remain the same. Which one, if either, is correct, and why?
a. Gertie, because the maximum voltage is determined by the battery. b. Gertie, because the capacitance of the capacitor does not change. c. Leah, because the capacitance decreases when the plate separation is increased. d. Leah, because the capacitance increases when the plate separation is increased. e. Neither, because the charge increases when the plate separation is increased.
Which of the following is NOT true about dark matter?
A.) Evidence for dark matter has been building for many decades. B.) Dark matter and dark energy are two aspects of the same phenomenon. C.) Dark matter is inferred from unseen gravitational effects in galaxies. D.) Dark matter is the dominant source of gravity in the Universe. E.) All of the above are true.