Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper because the
A) gravitational field is shielded inside the building.
B) mass of the building above slightly attracts us upward.
C) both of these
D) neither of these
Answer: B
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Buoyancy: Salt water is denser than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is
A. more. B. less. C. the same. D. Cannot be determined because we do not know the volume of the ship.
If you had something the size of a sugar cube that was made of white dwarf matter, it would weigh ________
A) as much as a truck B) as much as an average person C) about 5 pounds D) as much as the entire Earth
A long cylindrical shell (radius = 2.0 cm) has a charge uniformly distributed on its surface. If the magnitude of the electric field at a point 8.0 cm radially outward from the axis of the shell is 85 N/C, how much charge is distributed on a 2.0-m length of the charged cylindrical surface?
A. 0.38 nC B. 0.76 nC C. 0.19 nC D. 0.57 nC E. 0.98 nC
The Eiffel tower in Paris is 300 meters tall on a cold day (T = – 5 degrees Celsius). What is its height on a hot day when the temperature is 35 degrees? (It is made of iron which has a coefficient of linear expansion of 0.000012 per degree Celsius.)