If a comet's ion tail is pointing perpendicular to its direction of travel, the comet is
A) close to or at aphelion.
B) moving away from the Sun.
C) close to or at perihelion.
D) moving closer to the Sun.
E) A comet's tail never points perpendicular to its motion.
C
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Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force exerted on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.6 N B) 1.8 N C) 2.0 N D) 2.2 N E) 2.4 N
If luminosity depends on radius and temperature, what does flux depend on? _______________
Fill in the blank(s) with correct word
A brass pipe is twisted by torques T 5 800 N # m acting at the ends causing an angle of twist of 3.58. The pipe has the following properties: L 5 2.1 m, d1 5 38 mm, and d2 5 56 mm. The shear modulus of elas-ticity G of the pipe is approximately:
(A) 36.1 GPa
(B) 37.3 GPa
(C) 38.7 GPa
(D) 40.6 GPa
An ice skater has a moment of inertia of 5.0 kg ? m2 when her arms are outstretched, and at this time she is spinning at 3.0 rev/s
If she pulls in her arms and decreases her moment of inertia to 2.0 kg ? m2, how fast will she be spinning? A) 2.0 rev/s B) 3.3 rev/s C) 7.5 rev/s D) 10 rev/s