Physics, 27.01.2020 19:31 whitneyt2013
Which of the following accurately describes the behavior of water when subject to temperature change? a. the volume of water will decrease if heated from 6 c to 7 c. b. a mass of water will expand if heated from o c to 2 c. c. a mass of water will contract if cooled from 1 c to 3 c. d. the volume of water will increase if cooled from 3 c to 2 c
Answers: 3
Physics, 22.06.2019 01:30
In a thunderstorm, charge builds up on the water droplets or ice crystals in a cloud. thus, the charge can be considered to be distributed uniformly throughout the cloud. for the purposes of this problem, take the cloud to be a sphere of diameter 1.00 kilometer. the point of this problem is to estimate the maximum amount of charge that this cloud can contain, assuming that the charge builds up until the electric field at the surface of the cloud reaches the value at which the surrounding air breaks down. this breakdown means that the air becomes highly ionized, enabling it to conduct the charge from the cloud to the ground or another nearby cloud. the ionized air will then emit light due to the recombination of the electrons and atoms to form excited molecules that radiate light. in addition, the large current will heat up the air, resulting in its rapid expansion. these two phenomena account for the appearance of lightning and the sound of thunder. take the breakdown electric field of air to be eb=3.00ฤโ106n/c. part a estimate the total charge q on the cloud when the breakdown of the surrounding air is reached. express your answer numerically, to three significant figures, using ฤยต0=8.85ฤโ10รขโ12c2/(nรขโนโฆm2) .
Answers: 2
Physics, 22.06.2019 03:30
Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100ยฐf. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.
Answers: 1
Physics, 22.06.2019 22:00
Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.
Answers: 2
Physics, 23.06.2019 01:00
How much work would it take to move a coulomb charge across a 4 volt potential difference?
Answers: 2
Which of the following accurately describes the behavior of water when subject to temperature change...
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