As a result of friction between internal parts of an isolated system
a. the total mechanical energy of the system increases.
b. the total mechanical energy of the system decreases.
c. the total mechanical energy of the system remains the same.
d. the potential energy of the system increases but the kinetic energy remains the same.
e. the kinetic energy of the system increases but the potential energy of the system remains the same.
b
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Two point charges of +2.0 ?C and -6.0 ?C are located on the x-axis at x = -1.0 cm and x = +2.0 cm respectively
Where should a third charge of +3.0-?C be placed on the +x-axis so that the potential at the origin is equal to zero? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) x = 4.0 cm B) x = 1.0 cm C) x = 2.0 cm D) x = 3.0 cm E) x = 5.0 cm
If the Q value of an endothermic reaction is –2.17 MeV, then the minimum kinetic energy needed in the reactant nuclei if the reaction is to occur must be
1.equal to 2.17 MeV. 2.greater than 2.17 MeV. 3.less than 2.17 MeV. 4.exactly half of 2.17 MeV.
If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because
A) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact. B) of injuries suffered from direct hits of pieces of the asteroid or comet. C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer. D) the impact caused massive earthquakes worldwide.
A flask half filled with water is on a weighing scale. If you suspend a stone by a string into the water the scale reading will be
A) less. B) the same. C) greater.