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Inertia
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Angular momentum
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Moment of inertia
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Torque
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Center of mass
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Pairs of forces of equal magnitude act on identical cylinders as shown in the figures. In which example is the cylinder in translational and rotational equilibrium?
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Four identical particles, each with mass m, are arranged in the x, y plane as shown. They are connected by light sticks to form a rigid body. If m = 2.0 kg and a = 1.0 m, the rotational inertia of this array about the y-axis is:
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4.0 kg m2
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12 kg m2
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9.6 kg m2
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4.8 kg m2
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none of these
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Three identical objects, each of mass M, are fastened to a massless rod of length L as shown. The rotational inertia about one end of the rod of this array is:
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ML2/2
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ML2
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3ML2/2
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5ML2/4
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3ML2
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How defines period of physical pendulum?
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No correct answer
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Find a sample of the physical pendulum:
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None of them
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A sound wave can be characterized as
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A transverse wave
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A longitudinal wave
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A transverse wave or a longitudinal wave, depending on the nature of its source
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One that carries no energy
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A wave that does not require a medium to be transmitted from one place to the other
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Sound travels faster in
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a vacuum
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water
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steel
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air
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Sound travels at about the same speed in all of the above media.
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A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs
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She increases her moment of inertia, thus increasing her angular speed
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She increases her moment of inertia, thus decreasing her angular speed.
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She decreases her moment of inertia, thus increasing her angular speed
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She decreases her moment of inertia, thus decreasing her angular speed
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Her angular speed remains constant by conservation of angular momentum
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The pressure at the surface of the ocean is 1 atm (1 x 105 Pa). At what approximate depth in the ocean water (ρ = 1025 kg/m3) would the absolute pressure be 2 atm?
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1 m
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5 m
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10 m
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100 m
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1000 m
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What is the direction of angular momentum for the bowling ball that rotates about z-axis?
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+y
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–y
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+x
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–x
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+z
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–z
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A parallel-plate capacitor with air between the plates has an area A=2.00·104 m2 and a plate separation d=1.00 mm. Find its capacitance.
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C=1.77 pF
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C=1.77 F
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C=1.77 mF
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C=1.77 nF
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No correct answer
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Find the equivalent capacitance between a and b for the combination of capacitors shown in Figure. All capacitances are in microfarads.
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6.0 μF
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6.0 F
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5.0 μF
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6.0 nF
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No correct answer
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A parallel-plate capacitor has plates of dimensions 2.0 cm by 3.0 cm separated by a 1.0-mm thickness of paper. Find its capacitance (k = 3.7, ε0=8.85·10-12 C2/N·m2).
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20 pF
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20 F
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40 pF
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60 pF
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80 pF
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Find the electric flux though the spherical surface, covers the point-like charges q1=5 nC and q2=-2 nC. (ε0=8.85·10-12 C2/N·m2)
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339 N·m2/C
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0.339 N·m2/C
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339 N/C
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339 N·m2
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No correct answer
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Find the attractive force F between nuclei of hydrogen atom and electron. Radius of hydrogen atom is r=0.5·10-10 m; modules charge of nuclei are equal and opposite to charge sign of electron (ε0=8.85·10-12 C2/N·m2).
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F=92.3·10-9 N
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F=92.3 N
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F=92.3·10-9 N/m2
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F=92.3·10-9 N
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No correct answer
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Two point-like charges in air (ε=1) at the distance r1=20 сm from each other interact with some force. At what distance r2 one needs to place this charges in oil (ε2=5) to get the same force of interaction?
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r2=8.94 сm
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r2=8.94 m
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r2=8.94·103 m
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r2=8.94·10-3 m
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No correct answer