A student has a short spring. He is required to investigate how the length of the spring changes as the load stretching it increases. Describe the experimental procedure he should follow, stating the equipment he should use and the measurements he should make

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.

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

Smallest intensity of a stimulus that you can detect 50 percent of the time is