If Q = 20 ?C and L = 60 cm, what is the magnitude of the electrostatic force on any one of the charges shown?
A. 25 N
B. 19 N
C. 15 N
D. 9.1 N
E. 14 N
Answer: D
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Young's Modulus: A brass wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. By what distance did this fixture stretch the wire? Young's modulus for brass is 10 × 1010 N/m2.
A. 0.11 mm B. 0.22 mm C. 0.33 mm D. 0.62 mm
The distribution of the dark matter in a spiral galaxy is
A) flattened in a disk but about ten times larger than the stellar disk. B) flattened in a disk and about the same size as the stellar disk. C) approximately spherical and about ten times the size of the galaxy halo. D) predominantly concentrated in the spiral arms. E) approximately spherical and about the same size as the galaxy halo.
A 10.0 kg ball weighs 98.0 N in air and weighs 65.0 N when submerged in water. The volume of the ball is
A. 0.00337 
B. 0.00457
C. 0.00766
D. 0.00980
E. 0.00245
The water flowing over Niagara Falls drops a distance of 50 m. If all the gravitational potential energy is converted to thermal energy, by what temperature does the water rise? The specific heat of water is 4186 J/kg ? K
A) 0.10 C° B) 0.12 C° C) 0.37 C° D) 0.42 C°