Two forces produce equal torques on a door about the door hinge. 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 has a greater magnitude? A) the first force (at the midpoint)
B) the second force (at the doorknob)
C) The two forces are equal.
A
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A common 5-L metal can will float in air if it is
A) evacuated of air. B) filled with a very large amount of helium. C) thrown high enough into the air. D) Nonsense! Unless the can and displaced air weigh the same, the can can't float in air.
A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33.)
a. 3.2 b. 4.4 c. 2.1 d. 1.0 e. 0.3
Which of the following models best explains why our galaxy has spiral arms?
A) The spiral arms are a wave of star formation caused by a wave of density propagating outward through the disk of the galaxy. B) The spiral arms are composed of groups of stars that are bound together by gravity and therefore always stay together as the galaxy rotates. C) The spiral arms were imprinted on the galaxy at its birth. Ever since, like a coiling rope, the spiral arms have been wound tighter with each galactic rotation. D) No model can explain the existence of the arms, which rotate with the galaxy like the fins of a giant pinwheel toy.
Does it make sense that there are such noticeable differences in the jovian planets? Why or why not?
What will be an ideal response?