In a fission reaction, a 235U nucleus captures a neutron. What energy is released if the products are 139I, 95Y and two neutrons? (atomic masses: 235U, 235.043 9; 139I, 138.935 0; 95Y, 94.913 4; neutron, 1.008 67; and 1 u = 931.5 MeV/c2)
a. 123 MeV
b. 174 MeV
c. 199 MeV
d. 218 MeV
b
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Dark matter ____
a. is homogenously distributed through the Universe b. began clumping due to tiny variations in density at the moment of the big bang c. began clumping due to large variations in the distribution of matter and antimatter d. is isotropically distributed through the Universe e. began clumping due to the variations in the distribution of baryonic matter
Mars has two moons, Phobos and Deimos, that are most similar in character to
A) small asteroids. B) comets. C) Earth's Moon. D) particles in the rings of Saturn.
An ideal Carnot engine operates between reservoirs having temperatures of 125°C and -20°C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00°C
The heat of fusion of water is 3.34 × 105 J/kg and the heat of vaporization of water is 2.25 × 106 J/kg. (a) How much work does this engine do each cycle? (b) How much heat per cycle does this engine absorb at the hot reservoir? What will be an ideal response?
An astronaut who weighs 800 N on the surface of the Earth lifts off from planet Zuton in a space ship. The free-fall acceleration on Zuton is 3.0 m/s2 (down). At the moment of liftoff the acceleration of the space ship is 0.50 m/s2 (up). What is the magnitude of the force of the space ship on the astronaut?
A. 41 N B. 0.29 kN C. 0.24 kN D. 0.20 kN E. 0.37 kN