Felipe mide una habitación usando sus pies. (Sus pies son cada uno de un pie de largo.) Estima que la habitación mide unos diez pies y medio por trece pies y medio. Calcula que el área de la habitación es: 10.5' × 13.5’ = 141.75 pies2. 1. ¿Cuál crees que es la mejor descripción de la zona de la habitación? (Marque su elección.)

A. El área de la habitación es exactamente 141.75 pies2.
B. El área de la habitación es de aproximadamente 142 pies2.

2. Explique su respuesta:

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

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=3.00ă—106n/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 ďµ0=8.85ă—10â’12c2/(nâ‹…m2) .

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