A straight wire is bent into the shape shown. Determine the net magnetic force on the wire
when the current I travels in the direction shown in the magnetic field
.
?
a.
2IBL in the ?z direction
b.
2IBL in the +z direction
c.
4IBL in the +z direction
d.
4IBL in the ?z direction
e.
zero
b
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In a certain process a gas ends in its original thermodynamic state. Of the following, which is possible as the net result of the process?
A. It is adiabatic and the gas does 50 J of work B. The gas does no work but absorbs 50 J of energy as heat C. The gas does no work but loses 50 J of energy as heat D. The gas loses 50 J of energy as heat and does 50 J of work E. The gas absorbs 50 J of energy as heat and does 50 J of work
In their attempt to gauge the true shape of our Galaxy, the Herschels concluded that:
A) our Galaxy has a hexagonal shape. B) the Sun is the only luminous star in our Galaxy. C) the Sun and Earth are near the edge of our Galaxy. D) our Galaxy has some noticeable holes lacking stars around its edges.
Resistance and Resistivity: The resistivity of gold is 2.44 × 10-8 ? ? m at a temperature of 20°C. A gold wire that is 0.50 mm in diameter and 44 cm long carries a current of 380 mA. How many electrons each second pass a given cross section of the wire at 20°C? (e = 1.60 × 10-19 C)
A. 2.4 × 1018 B. 2.4 × 1017 C. 1.2 × 1022 D. 2.8 × 1014 E. 6.3 × 1015
From the center outward, which of the following lists the "layers" of the Sun in the correct order?
A) core, radiation zone, convection zone, photosphere, chromosphere, corona B) core, radiation zone, convection zone, corona, chromosphere, photosphere C) core, convection zone, radiation zone, corona, chromosphere, photosphere D) core, corona, radiation zone, convection zone, photosphere, chromosphere