The radius of curvature for a plane (flat) mirror is
A) negative.
B) infinite.
C) zero.
D) imaginary.
B
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An air-filled parallel-plate capacitor is constructed with a plate area of 0.40 m2 and a plate separation of 0.10 mm. It is then charged to a potential difference of 12 V?
(?0 = 8.85 × 10-12 C2/N ? m2 ) (a) How much charge is stored on each of its plates? (b) How much energy is stored in it?
Center of Mass: A 3.0-kg mass is located at (0.0 m, 8.0 m), and a 1.0-kg mass is located at (12 m, 0.0 m). You want to add a 4.0-kg mass so that the center of mass (or center of gravity) of the three-mass system will be at the origin. What should be the coordinates of the 4.0-kg mass?
A. (-3.0 m, -6.0 m) B. (-12 m, -8.0 m) C. (3.0 m, 6.0 m) D. (-6.0 m, -3.0 m)
Specific Heat: Object 1 has three times the specific heat capacity and four times the mass of Object 2. The two objects are heated from the same initial temperature, T0, to the same final temperature Tf. During this process, if Object 1 absorbs heat Q, the amount of heat absorbed by Object 2 will be
A. 12Q.
B. 6Q.
C. 
Q.
D. 
Q.
E. 
Q.
A hollow steel ball of diameter 3.0 m barely floats in water. What is the thickness of the wall of the ball? The density of iron is 7.87 g/cm3 and that of water is 1000 kg/cc
A) 6.6 cm B) 37 cm C) 131 cm D) 79 cm