Automatic Windshield Wipers

A caller on an automotive-themed radio program asked for help with a problem. It seems that when it rained her windshield wipers sometimes turned themselves on. How is this possible?

Author(s):

Evan M. Manning

Date Accepted: 1998-03-12 Grade Group: Middle School (6-8) Benchmarks: S13.4.1 Keywords: conduction conductivity electricity water ion wire battery motor Microsoft Word: 12_29_97_2.docx PDF Document: 12_29_97_2.pdf

Public Comments

September 4, 2004

I'm a retired mathematician / computer scientist, now mentoring some students on Science Fair projects where my granddaughter has just enrolled as a Freshman.

According to this article, the astronaut could easily see two separate objects. But it does not mention the question: whether the Astronaut could tell which is Earth and which is the Moon.

I guess the main question would be, could he tell which is larger and by approximately what factor?

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