A circular space station (shaped like a big wheel) rotates 100 times in one hour. The apparent weight of an astronaut standing on the inside surface of the outer wall is equal to her weight on earth. How far from the axis of rotation is the inside surface of the station’s outer wall?
A. 322 m
B. 102 m
C. 56 m
D. 1012 m
A. 322 m
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Organisms that are found living close to volcanic vents on the ocean floor are referred to as
A) calorophiles B) hypothermaphiles C) thermophiles D) psychrophiles
A spaceship encounters a single plane of charged particles, with the charge per unit area equal to ?. The electric field a short distance above the plane has magnitude ____ and is directed ____ to the plane.
A.
, parallelB.
, perpendicularC.
, parallelD.
, perpendicularE.
, parallelThe cause of the pulsations we see in the light from neutron stars is
A) the in and out pulsations of star's radius, as the star gets rapidly larger and then smaller. B) pulsations of its neutrons. C) the spinning motion of the star. D) motions of electrons within the star. E) Nonsense--neutron stars do not pulsate.
An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a maximum?
A) midway between A and B B) at either A or B C) one-third of the way between A and B D) one-fourth of the way between A and B E) at none of the above points