Abasement wall made of stone mix concrete (ksm = 1.4 w/mk) is 250 mm thick; its inner and outer wall temperatures are 20 °c and 0°c respectively. polystyrene sheet (kps = 0.027 w/mk) is added to maintain the heat flux at 12 w/m2. what is the thickness of polystyrene sheet? select one: o a. 50 mm o b. 40 mm o c. 30 mm o d. 20 mm

Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons

In the lab, ammonia was mixed with water to form ammonium hydroxide. what is/are the reactant(s)? o water and ammonia o ammonia o ammonium hydroxide need

Which of the following is true about the products formed during photosynthesis? (5 points) select one: a. they have the same mass as the mass of reactants. b. they are the same set of compounds as the reactants. c. they have more mass than the mass of reactants. d. they are chemically the same as the reactants.