An asteroid in orbit about the Sun has a linear speed of 4 km/s when at a distance of closest approach d from the Sun. What is its linear speed when it is at its greatest distance from the Sun, a distance 2d?
a. 1 km/s
b. 2 km/s
c. 8 km/s
d. 16 km/s
b
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According to the chart shown in figure Q13.6, how many stable isotopes of 30Zn exist?
A. One
B. Two
C. Three
D. Five
E. There is no way to determine this from the chart.
A polar bear of mass 200 kg stands on an ice floe that is a uniform 1.0 m thick. What is the minimum area of the floe that will just support the bear in saltwater of density 1030 kg/m3? The density of ice is 980 kg/m3
A) 1.0 m2 B) 2.0 m2 C) 3.0 m2 D) 4.0 m2
The black hole at the center of our galaxy is too large to be the remnant of a single star
a. True b. False Indicate whether the statement is true or false
The proper interpretation of the Hubble law (which relates the redshift of a galaxy to its distance) is that as time goes on, galaxies are____
a. staying relatively still in space while the space between the galaxies contracts b. moving away from a common center in space that is neither expanding nor contracting c. staying relatively still in space while the space between the galaxies expands d. moving away from a common center while the space between the galaxies expands e. moving toward a common center in space that is neither expanding nor contracting