Luluhop
date
name
homework 3 ecological and social footprint
1. harvesting raw materials causes disruption to our planet. match the raw material to
the correct harvesting method and the potential disruption.
metal ores
and minerals
drilling
loss of habitat for wildlife,
reduce capabilities for
co2 absorption
oil and
natural gas
deforestation
potential for spills
timber
farming
unknown long-term
consequences
use of agrochemicals to
increase yields pollutes
waterways
natural gas
mining
plants and
animals
fracking
scars the landscape, loss
of habitats

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)