Scientists have detected mergers of black holes that have spiraled into each other by
A) detecting gravitational waves from the merger.
B) observing distant systems that produce unusually strong gamma-ray emission.
C) observing distant systems that produce unusually strong radio emission.
D) detecting rapidly pulsating sources of gamma-ray emission.
A) detecting gravitational waves from the merger.
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A constant-volume gas thermometer is used to measure the temperature of an object. When the thermometer is in contact with water at its triple point (273.16 K) the pressure in the thermometer is 8.500 × 104 Pa. When it is in contact with the object the pressure is 9.650 × 104 Pa. The temperature of the object is:
A. 37.0 K B. 241 K C. 310 K D. 314 K E. 2020 K
In searching for life in the solar system, which basic requirement of life is the most fundamental and the one we always look for?
A) the presence of organic matter B) the presence of an energy source C) the presence of a liquid medium, most likely water D) the presence of oxygen
What does a breeder reactor "breed?"
A) more energy output than energy input B) fissionable isotopes from a non-fissionable isotopes C) more mass than it begins with D) all of the above E) none of the above
A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?
a. 42 kN b. 39 kN c. 45 kN d. 48 kN e. 35 kN