1 = strongly agree 2 = undecided 3 = strongly disagree a. Plastic goods are essential in our modern world:
b. Plastics do not harm the environment if we recycle them:
c. We need to invent more biodegradable plastics:
d. Plastic products are better than products made of glass, metal or paper because plastic costs less:
e. Chemicals fertilizers and pesticides endanger young children and animals:
f. Chemicals do not harm the soil, even if they are harmful to pests:

The mini-refrigerator fire was most likely caused by what type of wiring?

Amass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. initially, the mass is released from rest from a point 8 inches below the equilibrium position. find the equation of motion. (use g = 32 ft/s2 for the acceleration due to gravity.)

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.