samanthashade8352

18.09.2019 • 

Physics

mrs. smith's class is doing an experiment with thermometers. they fill up a cup with boiling water and sit it on the counter. they plan to check the temperature of the water in the cup after 5, 10, 15, and 30 minutes. what will mrs. smith's class observe about the temperature of the water after 30 minutes? a) the temperature of the water will decrease. b) the temperature of the water will stay the same. c) the temperature of the water will increase greatly. d) the temperature will increase first and then decrease.

Ответ:

nuna37

08.06.2020

Physics

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4.05 x 10^17 J

101.25 megaton

Explanation:

mass of rock, m = 4.5 kg

velocity of light, c = 3 x 10^8 m/s

According to the Einstein mass energy equivalence

Energy, E = m x c^2

E = 4.5 x 3 x 3 x 10^16 = 4.05 x 10^17 J

According to the question, 1 megaton = 4 x 10^15 J

So, 4.05 x 10^17 J = 4.05 x 10^17 / (4 x 10^15) Megaton = 101.25 megaton

Thus, teh energy released by 4.5 kg rock is 101.25 megaton.  

Explanation:

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