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Prayer and meditation
Problem: You read in a magazine that "nonphysical treatments such as meditation and prayer have been shown to be effective in controlled scientific studies for such ailments as high blood pressure, insomnia, ulcers, and asthma."
Requirement:
Explain in simple language what the article means by "controlled scientific studies." Why can such studies in principle provide good evidence that, for example, meditation is an effective treatment for high blood pressure?
A small container of water is placed on a carousel inside a microwave oven, at a radius of 11.5 cm from the center. What angle does the water surface make with the horizontal
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a 75kg astronaut is holding a 5kg ball while in deepspace. he wants to use the ball to travel backwards towards his
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Two large, parallel, conducting plates are 23 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of2.5 10-15 N acts on an electron placedanywhere between the two plates.
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