Which of the following cannot be described by a field?
A) gravitational forces
B) electrical forces
C) magnetic forces
D) radiation pressure
D
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Which of the following is evidence for supermassive black holes in active galaxies?
A) the discovery of powerful jets coming from a compact core B) rapid changes in the luminosity of the galaxy nucleus C) quasars emit approximately equal power at all wavelengths from infrared to gamma rays D) very high speed orbital motions around galactic nuclei E) all of the above
What must be true about the orbit of a planet discovered by the transit method?
A) The planet must be closer to its star than Mercury is to the Sun. B) The planet must have a face-on orbit as seen from Earth. C) The planet must have an edge-on orbit as seen from Earth. D) The planet's orbit must be very close to circular. E) The planet's orbit must be very eccentric.
A single-shell-eight-tube-pass heat exchanger is used in a power plant to preheat 55ºF water to 80ºF by using 190ºF hot water and cooling it to 160ºF. If the overall heat exchanger conductance is 400 Btu/hr?ft^2 ?0F and if 1800 lbm/min of 55ºF water is preheated, determine (a) mass flow of the hot water and (b) surface area of the heat exchanger.
What will be an ideal response?
You can increase the internal energy of a gas by heating it or by compressing it
Indicate whether the statement is true or false