Acamper is about to drink his morning coffee. he pours 400 grams of coffee, initially at into a 250-g aluminum cup, initially at 16.0°c. what is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? the specific heat of aluminum is 900 j/kg°c. assume that the specific heat of coffee is the same as the specific heat of water.

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies. molten iron has a density of 7.0g/cm cubed. in its solid state, iron has a density of 8.0g/cm cubed.

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.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional