Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Plate A has a uniform, positive charge density of magnitude ?A. Plate B has a uniform, negative charge density of magnitude ?B
What is the magnitude of the electric field half-way between the two plates?
E =(?A + ?B)/2?0
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If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from
to 
From the first law, calculate the change of internal energy of the gas in this process.
A. 312 J B. 291 J C. 365 J D. 155 J
Based on fundamental laws of motion and gravity, which of the following best explains why Kepler's second law (planets move faster in the parts of their orbit that are closer to the Sun and slower when they are farther from the Sun) is true?
A) A planet's angular momentum must be conserved as it moves around its orbit. B) The speed of a planet at any point in its orbit depends on its temperature, which varies with distance from the Sun. C) The strength of gravity is inversely proportional to the square of the distance between two objects. D) The gravitational influence of other planets determines the speed of any particular planet's orbit.
How can we determine the reflectivity of an asteroid?
A) by taking a photograph of it B) by measuring its mass and radius C) by comparing its brightness in visible light to its brightness in infrared light D) by where it is located in the asteroid belt
A star with a spectrum that peaks at a wavelength of 1 micron (1 × 10-6) would have a surface temperature of ________ and be an ________ star.
A. 2,900 K; O B. 29,000 K; M C. 2,900 K; M D. 29,000 K; O