In a given frictionless displacement of a particle, its kinetic energy increases by 25 J while its potential energy decreases by 10 J. Determine the work of the nonconservative forces acting on the particle during this displacement
a. -15 J
b. +35 J
c. +15 J
d. -35 J
e. +55 J
C
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When we say that an electromagnetic field is "quantized," we mean that
A) whenever it interacts with atoms, it must deposit an entire "quantum" of energy at each interaction. B) its energy is "digitized" to have either 0, 1, 2, 3, etc. units of a basic energy increment. C) it impacts a viewing screen as tiny bundles of radiation. D) All of the above. E) None of the above.
Consider the following two statements and then select the option below that is correct
i. It is possible for an object to move in the absence of forces acting on the object. ii. It is possible to have forces acting on an object in the absence of motion of the object.
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What will be an ideal response?
In the Rutherford model of the hydrogen atom, a proton (mass M, charge Q) is the nucleus and an electron (mass m, charge q) moves around the proton in a circle of radius r. Let k denote the Coulomb force constant (1/4??0) and G the universal gravitational constant. The ratio of the electrostatic force to the gravitational force between electron and proton is:
A) kQq/GMmr2 B) GQq/kMm C) kMm/GQq D) GMm/kQq E) kQq/GMm