An electric kettle supplies 20,000J of energy to heat 0.5kg of water. What is the temperature change? The specific heat capacity of water is 4200J/kg°C.

The change in temperature is 9.52°C

Explanation:

Since, the heat supplied by the electric kettle is totally used to increase the temperature of the water.

Thus, from the law of conservation of energy can be stated as:

Heat Supplied by Electric Kettle = Heat Absorbed by Water

Heat Supplied by Electric Kettle = m C ΔT

where,

Heat Supplied by Electric Kettle = 20,000 J

Mass of water = m = 0.5 kg

Specific Heat Capacity of Water = C = 4200 J/kg.°C

Change in Temperature of Water = ΔT

Therefore,

20,000 J = (0.5 kg)(4200 J/kg.°C) ΔT

ΔT = 20,000 J/(2100 J/°C)

ΔT = 9.52°C

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50

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