Silicon forms its strongest chemical bonds with
A) itself
B) carbon
C) oxygen
D) hydrogen
C
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The mass of visible matter in a galaxy can be estimated by measuring its luminosity. When this is compared with the measured mass of the galaxy, astronomers find that ____
a. the measured mass is about ten times the estimated mass, due to the effects of the central black hole b. the measured mass is approximately equal to the estimated mass c. there is no clear relationship between the estimated and measured mass d. the measured mass is about ten times the estimated mass, due to the effects of dark matter e. the estimated mass is about ten times the measured mass, due to the effects of dark matter
What is the primary reason that astronomers suspect that some jovian moons were captured into their current orbits?
A) Some moons have a composition that differs from the composition of the planets. B) Astronomers have observed moons being captured. C) Some moons are surprisingly large in size. D) Some moons have orbits that are "backwards" (compared to their planet's rotation) or highly inclined to their planet's equator.
Three resistors, 10 ?, 20 ?, and 30 ?, are wired in series and connected to a 120-V battery. How much current flows in the circuit?
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?
a. R = 0.29 km, and the car's speed is increasing. b. R = 0.23 km, and the car's speed is decreasing. c. R = 0.23 km, and the car's speed is increasing. d. R = 0.29 km, and the car's speed is decreasing. e. R = 0.29 km, and the car's speed is constant.