Which is a characteristic Venus shares with Earth?
a. Both planets have an ozone layer within their atmospheres
b. Both planets rotate clockwise on their axes.
c. Both planets have a uniform circulation within their atmospheres.
d. Both planets are still geologically active.
e. Both planets have heavily cratered surfaces.
d
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Which of the following statements best summarizes current evidence concerning dark matter in individual galaxies and in clusters of galaxies?
A) Dark matter is the dominant form of mass in both clusters and in individual galaxies. B) Dark matter is present between galaxies in clusters, but not within individual galaxies. C) Dark matter is present in individual galaxies, but there is no evidence that it can exist between the galaxies in a cluster. D) Within individual galaxies, dark matter is always concentrated near the galactic center, and within clusters it is always concentrated near the cluster center.
Which of the following is NOT a basic requirement for chemically based life?
A) a liquid medium to transport biological molecules B) a source of molecules from which to build living cells C) oxygen from photosynthesis D) a source of energy to fuel metabolism
A construction worker pulls a box of tools on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box and the tools is 40.0 kg
(a) Draw a free-body diagram for the box. (b) Calculate the acceleration of the box. (c) How hard does the floor push up on the box?
Explain how interferometry works
What will be an ideal response?