The Earth's magnetic field is attributed to the
A) flow of molten liquid in Earth's inner core.
B) flow of molten fluid in Earth's outer core.
C) movement of lithospheric plates in the outer mantle.
D) movement of lithospheric plates at Earth's surface.
Answer: B
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An object attached to an ideal spring executes simple harmonic motion. If you want to double the total energy of the object-spring system, you could
A) double the amplitude of vibration. B) double the spring constant of the spring. C) double both the amplitude and spring constant. D) double the mass of the object. E) double both the mass of the object and amplitude of vibration.
A 440-nm spectral line is produced by a transition from an excited state to the ground state. The natural line width of the spectral line is 0.020 pm
The average time the atom spends in the excited state is closest to which of the following? ( h = 1.055 × 10-34 J ? s = 6.59 × 10-16 eV ? s) A) 5 × 10-6 s B) 5 × 10-8 s C) 5 × 10-10 s D) 5 × 10-9 s E) 5 × 10-7 s
A football is thrown upward at a 30.0° angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
Physical Pendulum: A thin hoop is supported in a vertical plane by a nail. What should the radius of the hoop be in order for it to have a period of oscillation of 1.00 s? The moment of inertia of a hoop of mass M and radius R about a point on its rim is 2MR2.
A. 0.0154 m B. 0.0621 m C. 0.124 m D. 0.1876 m E. 0.248 m