The density of iron at room temperature is listed as
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In an electroplating process, copper (ionic charge +2e, atomic weight 63.6 g/mol) is deposited using a current of 10.0 A. What mass of copper is deposited in 10.0 minutes? Avogadro's number is 6.022 × 1023 molecules/mol and e = 1.60 × 10-19 C
A) 3.96 g B) 1.98 g C) 0.99 g D) 2.52 g E) 2.53 g
A refrigerator absorbs energy of magnitude |QC | as heat from a low temperature reservoir and transfers energy of magnitude |QH| as heat to a high temperature reservoir. Work W is done on the working substance. The coefficient of performance is given by:
A. |QC |/W B. |QH|/W C. (|QC | + |QH|)/W D. W/|QC | E. W/|QH|
What's the fundamental reason that Mars, unlike the Earth, has become virtually geologically dead?
A) its farther distance than Earth to the Sun B) its rapid rotation compared to the Earth C) its closer distance than Earth to the Sun D) its small size compared to Earth E) its slow rotation compared to the Earth F) its large size compared to the Earth
The Law of Universal Gravitation was developed by:
A) Kepler. B) Galileo. C) Newton. D) Copernicus. E) Einstein.