The type of EM radiation emitted when high speed electrons decelerate as they are smashed into a metal target is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. gamma ray.
c
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An object of mass m and moment of inertia I has rotational kinetic energy KER. Its angular momentum is:
a. 0.5 I/m. b. (2 IKER)1/2. c. (2 mKER)1/2 d. not given.
What is true of giant and dwarf elliptical galaxies?
A) The giants are mostly blue, the dwarfs are mostly red. B) The giants contain more total mass than the dwarfs. C) The dwarfs contain more total mass than the giants. D) They contain more dust than spirals. E) There are more giants than dwarfs.
A 2.0-kg block slides down a plane (inclined at 40° with the horizontal) at a constant speed of 5.0 m/s. At what rate is the gravitational force on the block doing work?
a. +98 W b. +63 W c. zero d. +75 W e. -75 W
A counterflow double pipe-heat exchanger is used to heat 0.8 kg/s of water from 40ºC to 80ºC with oil having specific heat of 2.1 kJ/kg?K. Assume the maximum oil flow can be 1.0 kg/s and that oil enters the heat exchanger at 170ºC. If the overall heat transfer coefficient is 425 W/m^2?K, determine the surface area of the heat exchanger and the effectiveness of the heat exchanger. Equation 9-29 defines the effectiveness.
What will be an ideal response?