A string with a fixed frequency vibrator at one end is undergoing resonance with 4 antinodes when under tension T1 . When the tension is slowly increased the resonance condition disappears until tension T2 is reached, there being no resonances occurring between these two tensions. How many antinodes are there in this new resonance?
a. 3
b. 4, since all resonances in this situation have the same number of nodes
c. 5
d. 2, since resonances only involve whole wavelengths
e. 6, since resonances only involve whole wavelength
a
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Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
a. 0 b. 1 N/C c. 2 N/C d. 4 N/C e. More information is needed to find the resulting field magnitude at this position.
At the lowest point in a vertical dive (radius = 0.58 km), an airplane has a speed of 300 km/h which is not changing. Determine the magnitude of the acceleration of the pilot at this lowest point
a. 26 m/s2 b. 21 m/s2 c. 16 m/s2 d. 12 m/s2 e. 8.8 m/s2
A system consisting of a positively-charged particle and an electric field
a. loses potential difference and kinetic energy when the charged particle moves in the direction of the field. b. loses electric potential energy when the charged particle moves in the direction of the field. c. loses kinetic energy when the charged particle moves in the direction of the field. d. gains electric potential energy when the charged particle moves in the direction of the field. e. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.
Radioactive Decay: The decay constant of a radioactive isotope is 1.60 × 10-3 s-1. At a given instant, the number of atoms of the radioactive isotope is 1.85 × 1012. How many atoms of the isotope remain after a time interval of 30.0 minutes?
A. 1.04 × 1011 B. 1.14 × 1011 C. 1.26 × 1011 D. 1.38 × 1011 E. 1.52 × 1011