A sphere of radius 10.0 cm floats in equilibrium partially submerged in water with its lowest point 5.00 cm below the water's surface. (a) What is the buoyant force acting on the sphere? (b) What is the weight of the sphere?
What will be an ideal response?
(a) 6.42 N
(b) 6.42 N
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To determine the height of a bridge above the water, a person drops a stone and measures the time it takes for it to hit the water. If the time is 2.3 s, what is the height of the bridge? Neglect air resistance
A) 32 m B) 52 m C) 10 m D) 14 m E) 26 m
What energy must be added or given off in a reaction where two hydrogen atoms and two neutrons are combined to form a helium atom? (Atomic masses for each: hydrogen, 1.007 825 u; neutron, 1.008 665 u; helium, 4.002 602 u; also, 1 u = 931.5 MeV/c2)
a. 74.85 MeV added b. 74.85 MeV given off c. 28.30 MeV given off d. 28.30 MeV added
One disadvantage of dispersion-strengthened metals at high temperatures is that the dispersion and the matrix are not in _________with each other, and as a result the matrix and dispersion may react with each other.
Fill in the blank(s) with the appropriate word(s).
The eye focuses by
A. moving the lens. B. moving the retina. C. moving both the lens and the retina. D. changing the focal length of the lens. E. changing the index of refraction of the vitreous fluid.