At what altitude should a satellite be placed into circular orbit so that its orbital period is 48.0 hours? The mass of the earth is 5.976 × 1024 kg and the radius of the earth is 6.378 × 106 m
A) 4.22 × 107 m
B) 7.58 × 107 m
C) 8.22 × 107 m
D) 6.07 × 107 m
E) 6.71 × 107 m
D
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The main drawback of coal as an energy resource is
A) its contribution to the global warming. B) its contribution to the ozone problem. C) limited resources are available. D) its contribution to acid rain. E) the economics associated with the coal industry.
Which of the following kind of stars is most dense?
a. a supergiant star b. a main sequence star c. a giant star d. a white dwarf e. the Sun
Current is the opposition to the flow of charge
a. True b. False Indicate whether the statement is true or false
How necessary is soap for removing salt from your hands?
A) Soap is necessary because it has both a polar and nonpolar end to interact with the positive and negative ions in the salt. B) Soap is necessary because it creates a film on the surface of your skin, shielding it from interacting with the ionic charges of the salt. C) Soap is not at all necessary for removing salt from your hands. The strong ion-dipole interactions between fresh water and the salt are most sufficient to lift the salt away from your hands. D) Soap is not necessary because there are no electrical charges on the skin of your hands for the salt to interact with.