Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2. If an electric field of 2.0 × 106 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?
What will be an ideal response?
11.1 nF, 17.7 C
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The heat of fusion of water is cal/g. This means 80 cal of energy are required to:
A. raise the temperature of 1 g of water by 1 K B. turn 1 g of water to steam C. raise the temperature of 1 g of ice by 1 K D. melt 1 g of ice E. increase the internal energy of 80 g of water by 1 cal
A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s2. Determine the tension in the string
a. 11 N b. 70 N c. 48 N d. 59 N e. 62 N
1.000 L of water at 20.00°C will occupy what volume if it is heated to 80.00°C? Water has a volume expansion coefficient of 210 × 10-6/°C. (Express your answer to 4 significant figures.)
A) 1.600 L B) 1.326 L C) 1.013 L D) 0.9870 L E) 0.9987 L
Which major division of chemistry deals
specifically with the identification of the substances present in a given sample of matter, and also with the determination of how much of each substance is present? a)biochemistry b)physical chemistry c)analytical chemistry d)organic chemistry