Seismic P-waves can travel through both solid and liquid materials
Indicate whether the statement is true or false
TRUE
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Components: A vector 
has components Ax = 12.0 m and Ay = 5.00 m.(a) What is the angle that vector 
makes with the +x-axis?(b) What is the magnitude of vector 
?
Fill in the blank(s) with the appropriate word(s).
What does the Moon's low density suggest about its internal structure?
A. The Moon's iron core is smaller relative to Earth's. B. The lunar interior has not differentiated. C. The Moon's crust is very thick and poor in iron. D. The lunar mantle extends to the center of the Moon.
Why can't astronomers use the 21-cm line of neutral hydrogen gas to measure the masses of elliptical galaxies?
A) All elliptical galaxies are too far away for us to detect the 21-cm line. B) The disorderly motion of the material in elliptical galaxies prevents us from measuring different velocities at different sides of the galaxy. C) Elliptical galaxies have little gas, so they do not have strong 21-cm line emission. D) Supermassive black holes in the center of elliptical galaxies disturb measurements of the 21cm line.
A certain spherical asteroid has a mass of is 4.65 × 1017 kg and a radius of 39,600 m
If a 150-kg object is dropped from rest at an altitude of 12,400 m above the surface of this asteroid, with what speed will it hit the surface? (G = 6.67 × 10-11 N ? m2/kg2 ) A) 19.3 m/s B) 22.7 m/s C) 26.2 m/s D) 18.2 m/s E) 13.8 m/s