A proton (m = 1.7 × 10^?27 kg, q = +1.6 × 10^?19 C) starts from rest at point A and has a speed of 40 km/s at point B. Only electric forces act on it during this motion. Determine the electric potential difference VB ? VA
a. +8.5 V
b. ?8.5 V
c. ?4.8 V
d. +4.8 V
e. ?17 V
b
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Radiation: What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 10-8 W/m2 ? K4)
A. 60.3 W B. 62.6 W C. 65.7 W D. 68.4 W E. 64.8 W
Water flows into a swimming pool at the rate of 7.0 gal/min. The pool is 17 ft wide, 32 ft long and 7.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches)
a. 34 hours b. 68 hours c. 67 hours d. 136 hours e. 680 hours
When the Huygens probe touched down on Titan, it landed
A) in a vast ocean of liquid methane B) on a solid surface of frozen water and methane ices that resembled a streambed C) in a shallow pool of liquid methane D) on the slopes of an icy volcano covered with water and methane ice
______________ is the study of planet Earth
Fill in the blank(s) with correct word