You have two identical pure silver ingots. You place one of them in a glass of water and observe it to sink to the bottom. You place the other in a container full of mercury and observe that it floats
Comparing the buoyant forces in the two cases you conclude that A)
the buoyant force in the water is equal to that in mercury.
B)
the buoyant force in the water is larger than that in mercury.
C)
the buoyant force in water is smaller than that in mercury.
D)
the buoyant force in the water is zero and that in mercury is non-zero.
E)
No conclusion can be made about the respective values of the buoyant forces.
C
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A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
A Udimet 700 turbine blade is exposed to a temperature of 1200 K (2160 R) at a tensile stress of 140 MPa (20 ksi)? How many hours is the turbine blade expected to survive these conditions?
What will be an ideal response?
The earth's northern magnetic pole acts like
A) it has negative charge. B) it has positive charge. C) it has no charge. D) the north pole of a magnet. E) the south pole of a magnet.
In the nuclear reaction 1H + 2H ? 3He, how does the nuclear energy and the total rest-mass of the two hydrogen nuclei compare with the nuclear energy and the total rest-mass of the resulting helium nucleus?
A) Nuclear energy of helium is more, mass of helium is the same as the mass of the two hydrogen nuclei. B) Nuclear energy of helium is less, mass of helium is less. C) Nuclear energy of helium is less, mass of helium is the same as the mass of the two hydrogen nuclei. D) Nuclear energy of helium, and mass of helium, are both the same as the nuclear energy and the mass of the two hydrogen nuclei. E) Nuclear energy of helium is more, mass of helium is more.