Cho mạch điện như hình 10.1 Biết hiệu điện thế Uab = 12 V R2 = 3 ôm bỏ qua mạch điện trở của dây nối ampe kế vôn kế a tính điện trở của biến trở khi biết chỉ số của ampe kế là 2 a b giữ Uab = 12 V Nếu vôn kế chỉ = 4,5 V thì điện trở của biến trở là bao nhiêu

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Which one of the following research methods can show cause and effect

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?