Dr. shepard is testing a new drug to treat arthritis symptoms. he uses a sample group of 1,000 arthritis sufferers, and has them each take the drug when experiencing symptoms, such as swelling, pain, and redness of the joints. of this sample group, 839 report that their arthritic symptoms seem to subside after taking the drug. from this data, dr. shepard concludes that the drug is effective. is his conclusion scientifically valid?

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Which of the following describes how a microwave heats food