evaluate the goals and challenges of U.S. involvement in wars in Afghanistan and Iraq. Choose one goal and challenge of each war.
One goal of the U.S. involvement in the war in Afghanistan was to dismantle and defeat terrorist groups such as Al Qaeda. One challenge of this war was the difficulty in identifying and locating the specific individuals responsible for carrying out terrorist attacks.
One goal of the U.S. involvement in the war in Iraq was to remove Saddam Hussein from power and eliminate weapons of mass destruction. One challenge of this war was the lack of a clear plan for post-war reconstruction and stabilization, leading to ongoing conflict and instability in the region.
Scientists used to believe that chemical reactions fueled the sun. Why did this lead them to believe that the sun was very young? What kind of reactions do we now think are responsible for the energy released by the sun? In one to two sentences, explain your reasoning
Scientists used to believe that chemical reactions fueled the sun because they didn't fully understand the nature of atomic particles and nuclear fusion. This led them to believe that a large amount of fuel would only sustain the sun for a relatively short amount of time. We now think that nuclear fusion reactions, such as the combination of hydrogen atoms to form helium, are responsible for the energy released by the sun due to overwhelming evidence from observations and experiments.
10 6C→10 5B+ 0+1e
A student claims that the equation models beta-minus decay because the atomic number of the nucleus decreases by one. In one or two sentences, explain the error in the student’s reasoning.