The tail of a comet always points:
A) toward the Sun and disappears at perihelion.
B) toward Earth and never varies.
C) away from the Sun and disappears at perihelion.
D) away from the Sun and becomes longest and brightest at perihelion.
E) in the direction of the comet's motion.
D
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Charge of uniform density (80 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm. Determine the magnitude of the electric field at a point which is 2.0 mm from the symmetry axis
a. 7.9 N/C b. 9.0 N/C c. 5.9 N/C d. 6.8 N/C e. 18 N/C
A fighter plane moving 200 m/s fires a projectile with speed 50 m/s in a forward direction. The projectile makes an angle of 30° with the direction of the plane's motion
What is the speed of the projectile with respect to a stationary observer on the ground? A) 293 m/s B) 243 m/s C) 268 m/s D) 250 m/s E) 281 m/s
If electrons were positive and protons were negative, Coulomb's law would be written
A) the same. B) somewhat differently. C) very differently.
Molecular Rotation: A diatomic quantum mechanical oscillator has a moment of inertia of 7.73 × 10-45 kg ? m2. What is the rotational energy when it is in the quantum state characterized by L = 2? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2.27 × 10-5 eV B. 2.70 × 10-5 eV C. 7.22 × 10-5 eV D. 8.71 × 10-5 eV