Physics, 20.07.2019 14:30 kaylanweston
1) a substance has a half life of 20 years. what percentage would be left after 40 years? 2)after 4 half lifes of uranium, 10 grams of the uranium remains. how much uranium did you start with?
Answers: 1
Physics, 22.06.2019 14:00
If element x has 99 protons how many electrons does it have
Answers: 1
Physics, 23.06.2019 01:00
Is the portion of the electromagnetic spectrum that has a frequency just above that of visible light.
Answers: 3
Physics, 23.06.2019 17:30
Aman walks foward on a bus. to a stationary obserrver, the bus moves east at a speed of 13 m/s if the man moves 0.7 m/s east relative to the bus. what is his velocity in the frame of reference of a stationary observer?
Answers: 1
Physics, 23.06.2019 23:30
Why is dalton credited with proposing the first atomic theory if democritus was talking about atoms almost 2200 years earlier?
Answers: 3
1) a substance has a half life of 20 years. what percentage would be left after 40 years? 2)after 4...
Mathematics, 21.03.2020 00:03
English, 21.03.2020 00:03
Mathematics, 21.03.2020 00:03