Physics, 09.01.2020 07:31, michaelchavez6959127

Why on earth the sky is in blue colour but it is black on the moon?

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Physics, 21.06.2019 15:10, jmac48828

Are aliens real? justify you’re answer.

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Physics, 21.06.2019 22:30, celibe9391

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

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Physics, 22.06.2019 00:10, oktacos

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

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Physics, 22.06.2019 04:30, tinytoonjr8052

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.