Suppose that a piece of polystyrene insulation board has a thermal conductivity of k= 0.04 W/m⋅K. In comparison copper has a thermal conductivity of about 400 W/m⋅K. If you want to make a wall of copper that provides the same insulation as a 4-cm polystyrene board, how thick does the copper wall have to be (in meters)? ANY HELP WITH THIS WOULD BE APPRETIATED (PLEASE INCLUDE WORK IF NEEDED)

What’s the percent by mass of carbon in c10h14n2

Ill give brainiestif one neutron initiates a fission event that produces two neutrons in the products, how many new reactions can now be initiated? if each of the neutrons produced in the first fission event then initiates a fission event that produces one neutron in the products, how many new reactions can now be initiated by each neutron? how many neutrons in total were produced by the two fission events described?

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.