Please please please help A 10g copper sphere was moving 40 m/s when it hit another object. This caused all of the KE to be converted into thermal energy for the copper sphere. How much energy was converted into thermal energy (heat)?

A. 0.0 J
B. 40 J
C. 200 J
D. 8.0 E3J

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

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.