Auniform disk with a rotational inertia of 2.0 kg*m^2 and diameter 30 cm rotates on a frictionless fixed axis through its center and perpendicular to the disk faces. a uniform force of 4.0 n is applied tangentially to the rim of the disk. what is the angular velocity of the disk after 6.0 s?

a) 4.8 rad/sb) 1.8 rad/sc) 18 rad/sd) 3.6 rad/se) 12 rad/s

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.

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is