What do the structures of Stonehenge, the Templo Mayor, and the Sun Dagger all have in common?
A) They were all places used for religious sacrifice.
B) They were all built on the orders of ancient Mediterranean kings.
C) They all can be used as lunar calendars.
D) They were all used by ancient peoples for astronomical observations.
E) all of the above
D
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The element most abundant in the Sun is oxygen
a. True b. False Indicate whether the statement is true or false
Why do almost all moons exhibit synchronous rotation in which they rotate with the same period as they orbit their planet?
A) The moons formed this way, with the same rotational and orbital periods. B) Most jovian moons were formed out of their planet's nebula with the same orbital period. C) The moons probably once orbited farther away and more slowly, but friction with solar nebula gas caused their orbits to come closer to their planet, speeding them up. D) The moons probably once rotated faster, but tidal friction slowed their rotations to match their orbital periods. E) Synchronous rotation is caused by orbital resonances with other moons.
The heavier elements like iron and nickel are abundant on Earth's surface, and the silicates dominate at the center of Earth.
Answer the following statement true (T) or false (F)
A roller coaster, loaded with passengers, has a mass of 3000 kg; the radius of curvature of the track at the bottom point of the dip is 24 m. If the vehicle has a speed of 18 m/s at this point, what force is exerted on the vehicle by the track? (g = 9.8 m/s2)
a. 2.3 × 10^4 N c. 7.0 × 10^4 N b. 4.7 × 10^4 N d. 1.0 × 10^4 N