Senior 1 homework questions, math 1 questions

1) The car moves at a constant speed during the reaction time, 120km h = 120000 3600 = 100 3m s

Displacement of uniform motion = 100 3 * (1 2) = 50 3m deceleration during braking time s=v t+v 2 2a a=f m=

The two types are combined, and the data is substituted.

Displacement of deceleration process = v 2 2a = (100 3) 2 8 = 1250 9s = 1250 9 + 50 3 = m

2) Using the integral method, the resultant force is 880 800 = 80 (n), from f = ma to get a =, and then using the isolation method, for people by Newton's second law, ft + fn m man g = m person a, solution to fn = 330 (n).

According to Newton's third law, the pressure fn of a person on a hanging plate is the opposite of the support force of a hanging plate on a person. Therefore fn = 330n.

sinα=sinβ

So sin -sin = 0

It is obtained by the equation of the sum difference product.

2cos((α2)sin((α2)=0

So cos((2)=0 or.

sin((α2)=0

So ( +2=k + 2 (k is an integer).

-2=k + k is an integer).

So + 2k+

β2kπ+2π

Because k is an arbitrary positive integer.

So + 2k+

Sum up. α+2kπ+π

or 2k

You have a lot of ...... to do your homework

You can write your homework between classes.

It's only 10 minutes, but it's okay to solve a few multiple-choice questions, and it adds up to a lot of time between classes.

Also, you can get to school early at noon, and there is a short period of time before the afternoon class, and the same is true before the evening self-study.

I don't know if you still have classes like politics, sports, and so on, and we were still taking them in our junior year of high school, and we used them as study halls.

Even the time you spend listening to the class can be used to feel that your grades should be pretty good, and there are some things that you really don't need to listen to during class, such as when the teacher comments on the homework, you can skip listening to the questions you fully understand and do the homework.

In addition, improving the efficiency of your homework is also a good way to save time, in fact, it is to concentrate on doing homework.

One more thing to add, if there are particularly difficult questions in the homework, don't spend too much time dwelling on them, and save them to ask the teacher or listen directly to the teacher when commenting.

It's a good thing to have ideals, don't give up, you have to see the ideals that you can't reach, and you have motivation.

I used to do homework while listening to class. Listen to him for a while when you encounter a topic you want to hear, and if you don't want to hear it, do your own homework.

When we were in our third year of high school, there was a lot of homework, and many people stopped attending classes and wrote their homework first. In fact, that's not good, listening to lectures and homework are to improve your knowledge reserve, it is recommended that you don't write if you can't finish the homework, listen to the class first!

For subjects that you don't learn well, listen well in class. If you learn well, the teacher repeats it every day, so you can not listen to it.

Prioritize your work. For example, if you are familiar with English multiple-choice questions, do it between classes or before bedtime for a while, so that you will not be too focused at such time, and you can do this kind of brainless question. There are not many math problems, but they are fine, if you do the problem, you must do it well, summarize it well, and take every small problem seriously.

If you don't think it's worth doing, you don't have to do it. Language: I think it's okay to take every quiz seriously. You don't have to do too many questions.

When the speed is up to 1m s, so when the ridge moves to the speed of 0, it will also slide down, smooth enough to penetrate the oblique wheel sensitive surface so the angular velocity remains unchanged, and the inclined direction is set to be the positive direction, a=-2m s, v=-3m s

Obtained by vt=v0+at.

3=1-2t

t=2s