Observations of type Ia supernovae reveal that the expansion of the universe is speeding up because of the presence of ___________ in empty space
Fill in the blank(s) with correct word
dark energy
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An object moves with constant speed through a fluid. For a fixed geometry and fluid density, if the viscosity of the fluid increases then the speed at which flow becomes turbulent
A) increases. B) remains the same. C) decreases. D) could increase or decrease depending on the shape of the object. E) could increase or decrease depending on the value of the fluid density.
Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that
a. Any two rubber rods charged this way have opposite charges on them. b. Any two glass rods charged this way have opposite charges on them. c. A rubber rod and a glass rod charged this way have opposite charges on them. d. All rubber rods always have an excess of positive charge on them. e. All glass rods always have an excess of negative charge on them.
A parallel plate air-dielectric capacitor with circular plates has a separation gap of 1.5 mm. If it is desired to store 12 mJ in this capacitor, what must the plate area be for a voltage of 1.5 kV?
a. 
b. 
c. 
d. 
How does the density of copper at its melting point of 1356 K compare to that of copper at room temperature, 293 K? Its linear expansion coefficient is 
A. 1.054 times as large B. 1.018 times as large C. 0.946 times as large D. 0.982 times as large E. 0.947 times as large