Physics, 15.10.2019 15:30 guillmar003
An astronomer sees two stars in the sky. both stars are equally far from earth, but the first star is brighter than the second star. which of the following is a valid conclusion about the first star?
it is larger than the second star.
it is smaller than the second star.
it is older than the second star.
it is younger than the second star.
Answers: 1
Physics, 21.06.2019 21:30
Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?
Answers: 3
Physics, 22.06.2019 00:00
Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?
Answers: 1
Physics, 22.06.2019 05:40
Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.
Answers: 3
Physics, 22.06.2019 07:10
1. how much energy is needed to raise the temperature of 40.0 g of argon from 25c to 40c? the specific heat capacity of argon is 0.520 j/(g·k) 2a. 23.0 ml of 0.100 m hcl (standard) are added from a buret to neutralize 50.0 ml of an unknown basic solution. 2b. if the oh- produced in the previous reaction came from ca(oh)2, then what is the molarity of the ca(oh)2? 3.calculate the new freezing-point of a solution when 60.5 grams of cacl2 solute is dissolved in 0.612 kg of water. 4. what is the maximum number of moles of alcl3 that can be produced from 5.0 mol al and 6.0 mol cl2? 5. a sample of oxygen gas has a volume of 150 ml when its pressure is 0.923 atm. if the pressure is increased to 0.987 atm and the temperature remains constant, what will the new volume be? 6. nitrogen gas in a closed container at a temperature of 100.0 oc and 3.0 atm is heated to 300 oc. what is the pressure of the gas at the higher temperature?
Answers: 3
An astronomer sees two stars in the sky. both stars are equally far from earth, but the first star i...
Mathematics, 17.07.2020 14:01
Mathematics, 17.07.2020 14:01
Mathematics, 17.07.2020 14:01
Mathematics, 17.07.2020 14:01
Mathematics, 17.07.2020 14:01
Physics, 17.07.2020 14:01
Mathematics, 17.07.2020 14:01
Mathematics, 17.07.2020 14:01
Mathematics, 17.07.2020 14:01
French, 17.07.2020 14:01