What volume of water at O°C can a freezer make into ice cubes in 1.0 h, if the coefficient of performance of the cooling unit is
1 answer:
Answer:
volume of water is 0.1092 m3
Explanation:
We know that heat energy required to convert water into ice is given as
Q =mL
where L is Latent heat of fusion of ice is 336000 Jkg-1
=1000*V
Q = 1000V*336*10^3
Q = 336*10^6 V
ENERGY used by the freezer is given as
= 6.0*1.7*10^3 W = 10,200 w
energy provided per hour is Q = 10,200 W *1*60*60 s = 3.67*10^7 J
THEREFORE we have V
336*10^6 V = 3.67*10^7 j
v = .109 m3
volume of water is 0.1092 m3
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Answer:
Explanation:
The resistance of a wire is given by:
where
is the resistivity of the material
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1) The first wire has length L and cross-sectional area A. So, its resistance is:
2) The second wire has length twice the first one: 2L, and same thickness, A. So its resistance is
3) The third wire has length L (as the first one), but twice cross sectional area, 2A. So, its resistance is
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Answer:
13.309 m/s²
Explanation:
Length from shoulder to hand, l = 30 cm = 0.3 m
initial velocity, u = 1 m/s
final velocity, v = 2.5 m/s
time, t = 3 s
Let the tangential acceleration is a.
by using first equation of motion
v = u + at
2.5 = 1 + 3 a
a = 0.5 m/s²
Let the centripetal acceleration is a'.
a' = v'²/l
a' = 2 x 2 / 0.3
a' = 13.3 m/s²
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A = 13.309 m/s²