Continuing the thinking in the last three exercises, convert this energy to an equivalent in mass, use einstein’s equation e = mc2. hint: divide the energy per m3 calculated in exercise 29.27 by the speed of light squared. check your units; you should have an answer in kg/m3. now compare this answer with the critical density. your answer should be several powers of 10 smaller than the critical density. in other words, you have found for yourself that the contribution of the cmb photons to the overall density of the universe is much, much smaller than the contribution made by stars and galaxies.
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Physics, 23.06.2019 00:30
Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.
Answers: 2
Physics, 23.06.2019 06:30
What surface does the epithelial tissue cover? a. the surface of the body b. lines internal organs c. forms many glands d. all of the above
Answers: 3
Physics, 23.06.2019 10:30
Auniform bridge, 20 m long and weighing 40000 n is supported by two pillars located 3.0 m from each end. if a 19600 n car is parked 8.0 m from one end of the bridge, how much force does each pillar exert?
Answers: 3
Continuing the thinking in the last three exercises, convert this energy to an equivalent in mass, u...
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