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?

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?