What is the typical thermal energy of an electron in a solid at room temperature?
A. 0.00
B. 0.0010 eV
C. 0.025 eV
D. 0.27 eV
E. 1.0 eV
C. 0.025 eV
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A marble rolls off the edge of a table top with a speed of 2.0 m/s. What is the magnitude of its velocity 0.10 s later?
What will be an ideal response?
What is the distance from the moon to the point between Earth and the Moon where the gravitational pulls of Earth and Moon are equal?
The mass of Earth is 5.97 × 1024 kg, the mass of the Moon is 7.35 × 1022 kg, the distance between Earth and the Moon is 3.84 × 108 m, and G = 6.67 x 10-11 N•m2/kg2. A) 3.45 × 108 m B) 3.83 × 107 m C) 4.69 × 106 m D) 3.83 × 106 m E) 4.69 × 107 m
What is the purpose of the salt bridge in a voltaic cell?
A) to prevent any further migration of electrons through the wire B) to allow for the build up of positively charged ions in one container and negatively charged ions in the other container C) to allow the Fe2 and the Cu2+ to flow freely between the two containers D) to allow for a balance of charge between the two chambers
To date the age of Earth, we look for rocks with a high percentage of
A) uranium-235 to lead-207. B) uranium-238 to lead-206. C) potassium-40 to argon-40.