What units do most electric companies bill in?
a. joule-hours
b. kilowatt-hours
c. ohm-hours
d. ampere-hours
e. watts per ampere
b
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At the center of our galaxy, ____
a. material is available to make stars but the region is too cold to support star formation b. large stars are formed by the collision of smaller stars c. stars form at the same rate as they do in the spiral arms d. there is no star formation since there is no gas present e. there is evidence of recent, rapid star formation and supernova explosions
What factors would determine that we live in a matter-dominated universe?
What will be an ideal response?
This diagram shows two energy levels in an atom. The lower level is "full" because it already has an electron with spin up and another with spin down. Therefore, a third electron must go into the higher energy level. What law or principle explains why?
A) the exclusion principle B) the uncertainty principle C) the law of conservation of angular momentum D) the law of conservation of energy
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N / m. What is the current in the coil?
a. 5.0 mA b. 1.7 A c. 8.3 mA d. 1.0 A e. 42 mA