Exoplanets known as super-Earths
A) orbit extremely massive stars.
B) have masses comparable to that of Jupiter.
C) have masses 2-10 times that of Earth.
D) have masses comparable to that of Neptune.
E) have yet to be observed.
C
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If not a single solid sheet, then the ring system of Saturn is best described as:
A. rapidly expanding gas with various different chemical compositions. B. randomly moving particles that will soon disperse in all directions. C. individually orbiting particles that are clustered around certain orbits. D. just an illusion. E. randomly moving particles that frequently collide, so that the force of collision quickly pushes the rings apart.
A small object is enclosed in plastic (n = 1.5). The object appears to be 4.0 cm below the surface. What is the actual distance of the object below the surface?
A. 2.0 cm B. 2.7 cm C. 4.0 cm D. 5.5 cm E. 6.0 cm
A carbon-detonation supernova starts out as a white dwarf in a close binary system
Indicate whether the statement is true or false
A box is moved 10 m across a smooth floor by a force F making a downward angle with the floor, so that there is effectively a 4 N force acting parallel to the floor in the direction of motion and a 3 N force acting perpendicular to the floor. The force F acts for 20 seconds. The impulse delivered to the box by the floor during this process has magnitude
A. 60 Ns. B. zero. C. 100 Ns. D. 80 Ns. E. Can't tell without knowing the weight of the box