When two solid spheres of the same material and same radius r are in contact, the magnitude of the gravitational force each exerts on the other is directly proportional to
a. r.
b. r2.
c. r3.
d. r4.
e. r6.
d
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The formula ?p ? x? h tells us that the product of ?p and ?x cannot be
A) less than h B) greater than h C) equal to h
What is true of giant and dwarf elliptical galaxies?
A) The giants are mostly blue, the dwarfs are mostly red. B) The giants contain more total mass than the dwarfs. C) The dwarfs contain more total mass than the giants. D) They contain more dust than spirals. E) There are more giants than dwarfs.
Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 ?T b. 33 ?T c. 72 ?T d. 64 ?T e. 46 ?T
Gamma ray bursts are ____
a. too weak to affect life on Earth b. an important influence on mutation and evolution c. the cause of the spectacular auroras at high latitudes d. triggers for solar flares and coronal mass ejections e. capable of causing mass extinction events