Consider two identical and symmetrical wave pulses on a string. Suppose the first pulse reaches the fixed end of the string and is reflected back and then meets the second pulse. When the two pulses overlap exactly, the superposition principle predicts that the amplitude of the resultant pulses, at that moment, will be what factor times the amplitude of one of the original pulses?
a. 0
b. 1
c. 2
d. 4
a
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How long does it take the Earth to complete one orbit around the Sun?
A) one year B) one day C) one month D) one week E) The time it takes Earth to orbit the Sun changes significantly from one orbit to the next.
A long wire carries a current of 3.0 A along the axis of a long solenoid (radius = 3.0 cm, n = 900 turns/m, current = 30 mA). What is the magnitude of the magnetic field at a point 2.0 cm from the axis of the solenoid? Neglect any end effects
a. 34 mT b. 64 mT c. 30 mT d. 45 mT e. 4.0 mT
What does a waxing gibbous moon mean?
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The internal energy of n moles of an ideal gas depends on
A. one state variable T. B. two state variables T and V. C. two state variables T and P. D. three state variables T, P and V. E. four variables R, T, P and V.