In an experiment to find the specific heat capacity of a metal, it is found that 5200 J is needed to raise the temperature of a 2kg block by 20 °C What value for the specific heat capacity is given by these results?
A 130 J/(kg C)
B 520J/(kg C)
С 52 000 J/(kg°C)
D 104 000 J/(kg°C)

A. 130J / kg°C

Explanation:

Amount of heat (Q) = 5200 J

mass (m) = 2 kg

temperature (dt) = 20°C

specific heat capacity (S) = ?

We know

Q = msdt

5200 = 2 * s * 20

s = 5200 / 40

s = 130 J /kg °C

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wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.