https://youtu.be/kr0r7HSbuXs
PHYS 1101: Lecture Eight, Part Seven
Okay. Now I want you to do those steps. So what I’ve done is taken another problem that’s different, but somewhat similar. And I have a collection of quiz questions here for you that have you gently reading this problem carefully and stepping through those problem solving steps. So for each quiz question, I have a little snapshot here to the side to remind you of what step, problem solving step this quiz question corresponds to.
In other words, this question’s helping you think about this visualization and what’s going on.
So I have a couple of questions that help you visualize the problem and of course, pause the video at any time to read it carefully.
These first two questions ask about the initial velocity vector direction. And then the final velocity vector.
And then putting that together, question six. What then represents the best curve trajectory for that spaceship in this case?
Then for problem solving step number two, I’ve given you just an axis here and defined an origin and suggest that you go through putting these vectors and this information on your graph. So take advantage of this graph, this real estate. Take your time and try to do that. Put that information on the graph.
Then I have some quiz questions which ask you to go through the exercise for step three in solving the problem. Find the components of the vectors, as many as you can. Do your Trig. You should be able to answer questions seven through ten by finding these velocity components.
Then question 11 and 12 really ties in with problem solving step two again, where I hope you have given some thought to not just initial and final velocity vectors, but what direction must your acceleration vector point in order for the velocity vector to change the way it does. What does ax and ay have to be?
Remember again, these are the change in the x velocity, the change in the y velocity every second. What do those have to be to cause the trajectory that you have mapped out?
And then make your list of knowns. I think it is a good idea to separate them into the x variables and the y variables. You can really cleanly go up and compare them to the two equations.
Quiz question 13 and 14 ask you about part of those steps. What variable and value do you actually need to get a number for, etc?
And then there’s step five, actually doing the math and getting your answer. And I’ve got a couple of questions for you in that regard. What equation is best to calculate these various things that you’ll need to calculate for this problem?
Okay? And 17 and 18, actually have you doing the calculation. Getting a real number for these. For all of these that you can just use three significant digits. You can type those into WebAssign. That should be fine. That’s for all the components I have you calculate along the way here.
And then the last question answers the problem. It’s the final answer that we’re asked to provide. What’s the magnitude of the spaceship’s acceleration during this 25 second interval?
And that brings us to the end of lecture eight.
Don’t hesitate to use the discussion board with questions or email me, and I’ll try to get to you as much as I can.