Physics: Aquantity of 14.1 cm^3 of water at 8.4°c is placed in a freezer compartment and allowed to freeze to solid ice at -7.2°c. how many joules of energy must be withdrawn from the water by the refrigerator?

Aquantity of 14.1 cm^3 of water at 8.4°c is placed - id1413842310501, sujeyribetanco2216

brainy51

02.01.2022

920.31 J

Explanation:

Given

Volume of water (V) =14.1 cm^3

mass(m) $=\rho \times V=1000\times 14.1\times 10^{-6}=14.1 gm$

Temperature $=8.4^{\circ} C$

Final Temperature $=-7.2 ^{\circ}C$

specific heat of water(c) $=4.184 J/g-^{\circ}C$

Therefore heat required to removed is

$Q=mc(\Delta T)$

$Q=14.1\times 4.184\times (8.4-(-7.2))$

Q=920.31 J

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kad3n

06.09.2020

3.57N

Explanation:

given

Speed of rotation, N = 1300 rpm

diameter, d = 35 cm, so that

radius, r = 17.5 cm = 0.175 m

mass of drop = 1.1 g = 1.1*10^-3 kg

Angular speed of water, ω = 2πN/60

ω = 2π*1300/60

ω = 8169.2/60

ω = 136.15 rad/s

apparent weight will be gotten by

W(a) = mω²r

W(a) = 1.1*10^-3 * 136.15² * 0.175

W(a) = 1.1*10^-3 * 18536.82 * 0.175

W(a) = 3.57 N

Therefore, the apparent weight of 1.1 g of water is 3.57 N

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