Which of the following provided the first observational in support of the predicted existence of gravitational waves?
A) the orbit of a star system consisting of two neutron stars that is slowly decaying in a way consistent with energy being carried away by gravitational waves
B) the energy generated by gravitational waves from the Sun that can be seen as it is absorbed by Jupiter
C) gravitational waves detected by the Hubble Space Telescope
D) photographs of spacetime that show the gravitational waves as ripples that are clearly visible
A) the orbit of a star system consisting of two neutron stars that is slowly decaying in a way consistent with energy being carried away by gravitational waves
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Which isotope is used to define the ATOMIC MASS UNIT?
A) 1H B) 2H C) 4He D) 12C E) 16O
Most photosynthesis takes place
a)when animals breathe. b)in tropical forests. c)in the oceans. d)in the atmosphere.
The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is
A) 1000 N. B) 2000 N. C) 3000 N. D) 4000 N. E) 5000 N.
The weight of a 1-centimer cubed metal cube scaled up by a factor of 10 will be
A) ten times as much. B) a hundred times as much. C) a thousand times as much. D) none of the above