An object is let fall from an airplane flying horizontal to the earth’s surface. How far does it fall before a speed of 20 m/s is reached? Neglect the air friction as a first approximation.
A) 20 m
B) 18 m
C) 16 m
D) 14 m
A) 20 m
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Technician A says that any vehicle producing excessive NOx emission can be identified by performing an opacity test on its exhaust smoke. Technician B says that PM in the exhaust gas is always identified in opacity testing. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Methods used to cut or shape metal include:
A) Chemical reaction B) Abrasives C) Melting D) All of the above
Safety concerns are of critical importance with regard to work in a manhole due to the increased threat of:
A) water seepage B) things to trip on in the dark C) toxic gases D) insufficient oxygen E) both a and c F) both c and d
Thermocouples are temperature-sensing devices that produce ________ as a function of temperature
A) A large voltage B) An increase of resistance C) A decrease of resistance D) A small voltage