A 120 kg mass is blown apart into a 80 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The velocity of the 80 kg mass is
A. 59 m/s.
B. 51 m/s.
C. 34 m/s.
D. 20 m/s.
E. 14 m/s.
D. 20 m/s.
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A solid rock, suspended in air by a spring scale, has a measured mass of 9.00 kg. When the rock is submerged in water, the scale reads 6.43 kg. What is the density of the rock? (water density = 1000 kg/m3)
a. 1.40 × 10^3 kg/m3 c. 1.84 × 10^3 kg/m3 b. 3.50 × 10^3 kg/m3 d. 1.58 × 10^3 kg/m3
Which of these problems arise partly from nuclear power plants but not from coal-fired power plants?
A) solid waste disposal problems B) proliferation of nuclear weapons C) thermal pollution of lakes or rivers D) All of the above. E) None of the above.
What would be the resonant frequency of an LRC circuit with R = 15 ?, L = 25 mH, and C = 30 ?F?
A) 1150 Hz B) 180 Hz C) 60 Hz D) 120 Hz E) 53 MHz
Displacement divided by time gives
a. average acceleration. b. average velocity. c. average speed. d. average distance.