Answer: Fire
Explanation: I found a source that talks about the stanges of the 'stone age' and the things that were discovered in certain times. I can attach the link if you would like.
Answer:
B.Provide guards on power tools and other equipment with moving parts
Explanation:
A guard/ safeguard is a machine feature that is on/around an engineering equipment which can prevent the contact of a user with hazardous parts of the machines such as point of operation and rotating parts.The guard can be on power tools to enable an alternataive ways of switching off the equipment when a danger scenario occurs.When using a tool/equipment, safeguards must be on/active.
Answer:
It radiates at a rate of
Explanation:
We shall use Stefan–Boltzmann law to calculate radiant emission of energy
According to Stefan–Boltzmann law we have
For a perfect black body we have 'e' =1
It is given surface temperature =
Thus applying values in the above equation we have
energy per unit surface area=
mechanism, in mechanical construction, the means employed to transmit and modify motion in a machine or any assemblage of mechanical parts.
Answer:
Evaporator,Compressor,Condensor ,Expanding valve
Explanation:
Split air conditioning :
Split air conditioning means that, condensor unit or some time called outdoor unit is split from evaporator.It means that evaporator and condensor are placed at some distance.
The four component of split air conditioning system are as follows
1.Evaporator
It absorb heat from room and produces the cooling effect.
2.Compressor
It compresses the refrigerant which exits from evaporator.
3.Condensor
It rejects the heat and cool the evaporator.
4.Expanding valve
It allows to refrigerant to cool up to evaporator pressure.