A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about normal force F on the block due to the ramp?
A) F > mg
B) F > mg cos ?
C) F > mg sin ?
D) F = mg cos ?
E) F = mg sin ?
D
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Which of the following appears most favored by natural selection?
A) intelligence B) opposable thumbs C) bipedal locomotion D) binocular vision E) live birth
A charge of 10 nC is distributed uniformly along the x axis from x = ?2 m to x = +3 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point x = +5 m on the x axis?
A.
B.
C.
D.
E.
The Schrödinger equation is most useful for describing
A) submicroscopic particles. B) microscopic particles. C) macroscopic particles. D) none of the above
A potential difference of 1.00 V is maintained across a 10.0-V resistor for a period of 20.0 s. What total charge passes by a point in one of the wires connected to the resistor in this time interval?
1.200 C 2.20.0 C 3.2.00 C 4.0.005 00 C 5.0.050 0 C