A brick and a feather fall to the Earth at their respective terminal velocities. Which object experiences the greater force of air friction?
A) Neither, both experience the same amount of air friction force.
B) the brick
C) the feather
B
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Moment of Inertia: In the figure, a weightlifter's barbell consists of two identical small but dense spherical weights, each of mass 50 kg. These weights are connected by a thin 0.96-m rod with a mass of 24 kg. Find the moment of inertia of the barbell through the axis perpendicular to the rod at its center, assuming the two weights are small enough to be treated as point masses.
Fill in the blank(s) with the appropriate word(s).
A series ac circuit has a resistance of 2.0 k?, a capacitance of 8.0 ?F, and an inductance of 9.0 H. If the frequency of the alternating current is 4.0/? kHz, by what angle does the voltage lead the current?
A) -3.1 rad B) +36 rad C) +1.5 rad D) +3.1 rad E) -1.8 rad
In beta decay, it is found that the energy of the emitted electrons varies and is always less than what is calculated on the basis of the parent and daughter nuclei. This is evidence for the existence of another particle called the
A) gluon. B) meson. C) neutrino. D) quark. E) positrons.
A 0.400-kg object is attached to a spring with spring constant k = 10.0 N/m and moves with simple harmonic motion over a horizontal frictionless surface. At the instant that it is displaced from equilibrium by ?0.0550 m, what is its acceleration?
a. 2 200 m/s2 b. ?220 m/s2 c. 0.220 m/s2 d. 1.38 m/s2 e. 0.550 m/s2