A) a closed insulated tank is used to heat 400 l of chemical for a production process. there is no loss of heat energy from the tank. given the density of the chemical is 1100 kg/m3, initial temperature of the chemical is 15°c, and the specific heat value of the chemical is 2.2 kj/(kg. k) how much heat energy is required to raise the temperature of the chemical (i) to 40°c? (15 marks) (ii) how long will it take to heat the chemical to 40°c using a 4 kw heater fully immersed in the chemical? assume 100 % efficiency for the heater. (10 marks) state the units for your answers.

Two red blood cells each have a mass of 9.0 multiply.gif 10-14 kg and carry a negative charge spread uniformly over their surfaces. the repulsion arising from the excess charge prevents the cells from clumping together. one cell carries −2.50 pc of charge and the other −3.10 pc, and each cell can be modeled as a sphere 7.5 μm in diameter. (a) what speed would they need when very far away from each other to get close enough to just touch? assume that there is no viscous drag from any of the surrounding liquid. answer is: 321 m/s how do i find this (b) what is the maximum acceleration of the cells in part (a)? answer is: 1.38e+10 m/s2 how did they find this answer

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus