Physics, 13.10.2019 06:00 sierravick123owr441
During a lab activity, students prepared two solutions separately at the same temperature. later they mixed the solutions and the temperature dropped. why? a. there was no energy input during the chemical reaction. b. energy was absorbed during the chemical reaction. c. energy was released during the chemical reaction. d. the temperature of the surroundings dropped.
Answers: 2
Physics, 21.06.2019 20:00
How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?
Answers: 1
Physics, 22.06.2019 08:50
You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?
Answers: 1
Physics, 22.06.2019 10:20
Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.
Answers: 2
Physics, 22.06.2019 12:50
Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.
Answers: 2
During a lab activity, students prepared two solutions separately at the same temperature. later the...
English, 04.12.2020 19:00
Health, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
Mathematics, 04.12.2020 19:00
History, 04.12.2020 19:00
Biology, 04.12.2020 19:00