Two charges lie on the x axis, +3q at the origin, and ?2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
a. 1.0 m.
b. 2.0 m.
c. 2.5 m.
d. 3.0 m.
e. 4.0 m.
d
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The vernal equinox is the point on the sky where the Sun crosses the ____________ going north and east
a. north celestial pole b. south celestial pole c. celestial equator d. horizon
A uniform rod (mass = 1.5 kg) is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a horizontal position. What is the angular speed of the rod when the rod makes an angle of 30° with the horizontal? (The rotational inertia of the rod about the pin is 2.0 kg?m2).
A. 2.2 rad/s B. 3.6 rad/s C. 2.7 rad/s D. 3.1 rad/s E. 1.8 rad/s
If a doubly-ionized oxygen atom (O–2) is accelerated from rest by going through a potential difference of 32 V, what will be the change in its kinetic energy?
a. 16 eV b. 32 eV c. 64 eV d. 51 eV e. none of the above
Which of the following wavelengths could NOT be present as a harmonic on a 2-m-long string?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m