Fermium-253 has a half-life of 3.00 days. A sample of fermium has 7.37 × 107 nuclei. How long will it take for there to be only 3.36 × 106 fermium nuclei in this sample?
A)
2.75 days
B)
9.80 days
C)
13.4 days
D)
15.7 days
E)
58.6 days
C
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A 2000-kg sailboat experiences an eastward force of 2000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 60° N of E c. 30° N of E b. 62° N of W d. 74° N of W
In England in the Middle Ages an extensive system of canals was used for transportation. Some of these canals crossed over canyons by flowing over bridges (viaducts). Suppose that a heavily loaded barge crossed over such a waterway bridge
A) The force downward on the bridge would increase because of the added weight of the barge. B) The force on the bridge would not change when the barge passed over. C) The force on the barge would become less because some water would be squeezed off of the bridge. D) The force on the bridge would become less because of the buoyancy effect of the water on the barge. E) Whether or not the force on the bridge would increase or decrease would depend on whether the water was flowing or stationary.
Work is done on an object to increase its total energy. Which one of the following is true?
A. Both the kinetic energy and potential energy can be larger B. The total work done must be equal to the energy lost to heat and sound C. If the potential energy increases, then the kinetic energy must decrease D. The object must have a larger speed and smaller height above the ground
The atmosphere of Titan is chiefly
A) ammonia. B) nitrogen. C) oxygen. D) methane. E) hydrogen.