Forensic science
what is not a guideline required for a valid evidence test?
a the test must be conducted by a forensic scientist in a forensics lab.
b the test must be reproducible, producing the same results every time using the same samples.
c the test must be specific to identify a particular substance.
d the test must be sensitive in that it can pick out the unique characteristics in a sample
me out quick 20 points,
ill give brainiest,
don't answer "i don't know" that doenst me out man

The plum pudding model of the atom state that ?

If the spring constant k of a pogo stick is 3500 n m and the weight of the person on the pogo stick is 700 n, how much is the spring in the botom of the pogo stick compressed?

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)