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Mandarinka [93]
2 years ago
9

Do this work if someone give correct answer I make her brainliest do this worksheet please

Physics
1 answer:
alexira [117]2 years ago
5 0

Answer:

a. Any one way then I can say that Aluminum sulfide has mass per mole of ≈150.2g while aluminum has mass per mole of 26.9g

b. Sulfur is an element but aluminum sulfide is a compound

c.Beryllium and chlorine

d. BeCl2

e.i. Metals form ions by losing electrons but nonmetals form ions by gaining electrons

ii.A metal can react with an acid to produce a salt a nonmetal doesnt

iii. A metal forms ionic compounds whilst nonmetals form covalent compounds

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Explanation :

The forces acting on hot- air balloon are:

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Force due to air resistance, (F)

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Its weight W is acting in downward direction. The upthrust force U acts in upward direction. When the balloon is moving upward, the air resistance is in downward and vice versa.

In this case, the hot-air balloon descends vertically at constant speed.

so, a=0

and F=ma=0

so, W = F + U ....................(1)

when it is ascending let the weight that it is releasing is R, so

(W-R) + F = U..........(2)

solving equation (1) and (2)

(W-R)+F=W-F

R=2F            

2F is the weight of material that must be released from the balloon so that it ascends vertically at the same constant speed.

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