Which of the following is true of Venus?
A) It has polar caps of solid water.
B) It is 50 percent the size of planet Earth.
C) It is the fourth largest planet of the Solar System.
D) It has a thick cloudy atmosphere that hides its surface from view.
D
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Observations in the X-ray portion of the spectrum are routinely done from the surface of the Earth
Indicate whether the statement is true or false
Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force exerted on the boat by the water greater?
A) in salt water B) in fresh water C) The buoyant force is the same in both cases.
If you pound a feather with a hammer, which one feels a greater force?
A) always the feather B) always the hammer C) The size of the force is always exactly the same on both of them. D) If the feather moves, then it felt the greater force. Otherwise the force was the same on both.
Radioactive Decay: The decay constant of a radioactive nuclide is 3.1 × 10-3 s-1. At a given instant, the activity of a specimen of the nuclide is 70 kBq. How much later has the activity declined to 10 kBq?
A. 630 s B. 690 s C. 750 s D. 820 s E. 880 s