Answer:
D. The development of a solar heating system.
Explanation:
Warming a cup by adding hot tea is science, so is study of heat transfer so the answer has to be D
Answer:
The answer is 33 .
Explanation:
The mass number of an atom is the atomic mass which consists of proton and neutron. This atom has 16 protons and 17 neutrons so it has a mass of 33 :
proton number + neutron number = nucleon number / atomic mass
16 + 17 = 33
<span> rate 3/1= square root of 32/x
square both sides
9/1=32x
x = 32/9
= 3.6
Must be He
molar mass =4
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Answer:Most fabrics made of synthetic fibres do not wrinkle easily. Fabrics made of synthetic fibres are generally more durable, less expensive, and more readily available than those made of natural fibres. Most synthetic fibres can handle heavy loads without breaking. 5 demerits are
They easily melt and burn to form small sticky beads at a very high temperature. ...
Unlike natural fibers, they do not absorb sweat. ...
They get electrically charged in dry weather. ...
They are not biodegradable, and hence, cause a lot of pollution.
Explanation:
?
Answer:Well-known examples are sodium hydroxide (NaOH) with OH- as the polyatomic anion, calcium carbonate (CaCO3), and ammonium nitrate (NH4NO3), which contains two polyatomic ions: NH+ and NO3-. ... The properties of compounds containing polyatomic ions are very similar to those of binary ionic compounds.
Explanation: