An object initially at rest suddenly explodes in two fragments of masses and that move in opposite directions. If the speed of the first fragment is find the internal energy of the explosion
A) 38 J B) 30 kJ C) 30 J D) 38 kJ
C
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Earlier than a certain time, the laws of modern physics cannot describe the universe adequately. Roughly when is that time?
A: 10^43 seconds B: 10^33 seconds C: 1 minute D: 3 minutes E: 1 million years
A rifle is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What is the distance from the center of the target to the point where the bullet strikes the target?
a. 48 cm b. 17 cm c. 31 cm d. 69 cm e. 52 cm
What is the binding energy per nucleon of 197Au (atomic number = 79)? (The following information regarding atomic masses will be needed: 197Au, 196.966543 u; hydrogen, 1.007825 u; neutron, 1.008665 u; also 1 u = 931.5 MeV/c2.)
a. 8.3 MeV c. 7.7 MeV b. 7.9 MeV d. 7.3 MeV
Earthquake S waves are
a. transverse. b. sometimes longitudinal and sometimes transverse. c. longitudinal. d. neither longitudinal nor transverse.