Where do we observe black holes?
A. In orbit around stars in binary systems.
B. In the center of the Milky Way Galaxy.
C. In the centers of elliptical galaxies.
D. In quasars.
E. All of the above.
Ans: E. All of the above.
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Mars' magnetic field is so weak because
A) it spins much slower than Earth does. B) it core may no longer be molten. C) its core contains less iron than our own. D) Both B and C are probable. E) All of the above are correct.
A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration of object in free fall is 3.5 m/s2 and there is no atmosphere. What is the speed of the hammer after 8.0 s?
A) 7.0 m/s B) 14 m/s C) 21 m/s D) 64 m/s
Linear momentum is conserved in all collisions
a. True b. False Indicate whether the statement is true or false
Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?
A) the first at the midpoint B) the second at the doorknob C) both exert equal non-zero torques D) both exert zero torques E) Additional information is needed.