What is the average translational kinetic energy per molecule of an ideal gas at a temperature of 300 K? The Boltzmann constant is 1.38 × 10-23 J/K
A) 1.7 × 10-21 J
B) 8.3 × 10-21 J
C) 6.2 × 10-21 J
D) 2.1 × 10-21 J
E) 4.1 × 10-21 J
C
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A girl is sitting on the edge of a pier with her legs dangling over the water. Her soles are 80.0 cm above the surface of the water. A boy in the water looks up at her feet and wants to touch them with a reed. (nwater = 1.333.) He will see her soles as being
a. right at the water surface. b. 53.3 cm above the water surface. c. exactly 80.0 cm above the water surface. d. 107 cm above the water surface. e. an infinite distance above the water surface.
Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). You measure the amount and determine that there are 5 grams of potassium-40 in the rock
By measuring the amount of its decay product (argon-40 ) present in the rock, you realize that there must have been 40 grams of potassium-40 when the rock solidified. How old is the rock? A) 1.3 billion years B) 2.6 billion years C) 3.9 billion years D) 5.2 billion years E) none of the above
Today, the leading hypothesis for the existence of hot Jupiters is that they formed in their outer solar systems and then migrated inward. Why did this hypothesis gain favor over alternative ideas?
What will be an ideal response?
Four resistors are connected in parallel: the resistance values are 4-ohms, 8-ohms,12-ohms, and 16-ohms: they are connected across a 120-volt DC supply: Find the total circuit resistance.