How much heat is required to change the temperature of 10 grams of water from 4 degrees celsius to 8 degrees celsius?

0.167 kJ

Explanation:

The rise in the temperature of a substance or a material caused by absorbing the heat energy is given in an equation Q = m x c x ∆T, where:

Q is an amount of heat absorbed ( in Joules)

m is the mass of the substance (in kilograms)

c is specific heat capacity ( amount of heat per unit mass required to raise the temperature by one degree Celsius)

∆T is the difference in the temperature

So, m=10g which is 0.01kg; ∆T is 8°C - 4°C= 4°C; and c for water is constant value and is equal to 4186 J/kg C.

Now it's easy to calculate the amount of energy: Q=0.01x4186x4 which equals to 167.44 J, which is approximately 0.167 kJ

the answers would be

the first one and the second one

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

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