Stirring dry yeast into a bowl of hydrogen peroxide causes bubbles to form. blowing air into a glass of milk with a straw also causes bubbles to form. one of these is a physical change, and the other is a chemical change. how could you determine which type of change is occurring in each situation?
Answers: 1
Physics, 23.06.2019 00:10
Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.
Answers: 2
Physics, 23.06.2019 12:00
When thorium (90 protons) ejects a beta particle, the resulting nucleus has question 18 options: 87 protons. 88 protons. 89 protons. 90 protons. none of the above
Answers: 1
Physics, 23.06.2019 12:20
The lid of a pressure cooker forms a nearly airtight seal. steam builds up pressure and increases temperature within the pressure cooker so that food cooks faster than it does in an ordinary pot. the system is defined as the pressure cooker and the water and steam within it. if 2.0 g of water is sealed in a pressure cooker and then vaporized by heating, and 5655 j must be added as heat to completely vaporize the water, what is the change in the system’s internal energy? answer in units of j.
Answers: 3
Stirring dry yeast into a bowl of hydrogen peroxide causes bubbles to form. blowing air into a glass...
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