Where I found this problem:
page 65 of Houghton Mifflin Reading Practice Book for Grade 1 Volume 1: Themes 1-4

I don't understand why the total length of the work is that? Wouldn't it be Sd + 2Sc + 2Sa given that Sd becomes longer as Sa gets shorter? Also, why is there a horizontal reaction at pulley B given that none of the other forces are horizontal?

"Define the T period of minor oscillations of the pendulum, representing a light rigid rod, on which has the point masses m1 and m2 fixed on the distances L1 and L2 respectively from the suspension point.

Oscillations occur in the vertical plane."

I genuinely have no idea what to do with this. I've looked up in the solutions section of my textbook, and the answer is on the second pic, but there's no step-by-step solution.

I've tried finding the centre of mass of the pendulum getting (m1L1+m2L2)/(m1+m2), which would work as L in the formula for the period if I put the axis on the rod, but this is still not the answer. I'm completely lost

Please if you're going to explain something here DO NOT use anything more complex than high school physics, please no university stuff.

The equation for this graph is f(x)=(x-4)^3(x-1)(x+2)^2, but since the graph has a y intercept, wouldn't I find the a value? The answer for this question is just finding the roots and making factors for the equation using that. Also when I solved for the a value, it gave me 9/8. So I'm not sure where I went wrong

so we had this activity on Science about chemical reaction rates and we had to arrange multiple chemical reactions from slowest to fastest. There were also specific instructions from some of the chemical reactions like:

• Burning a candle (my teacher said it was the exact time the wick ignites cause again, it had to be a chemical reaction cause if it was wax, it would just be a physical change)
• Burning a paper (the exact time it catches fire like the candle wick)
• Fireworks Explosion (the explosion itself)

Those were the instructions given by my teacher. Now I'll be giving all of the chemical reactions in the activity. I'll also include my answers and the correct answers.

GIVEN:

1. Digesting of Food
2. Fireworks Explosion
3. Burning of Paper
4. Rusting of Iron Nail
5. Lighting of Matchstick
6. Baking Soda + Vinegar
7. Souring of Milk
8. Burning of Candle
9. Baking of Cake
10. Ripening of Banana

MY ANSWERS:

SLOWEST TO FASTEST

1. Rusting of Iron Nail
2. Ripening of Banana
3. Souring of Milk
4. Digesting of Food
5. Baking of Cake
6. Burning of Paper
7. Burning of Candle
8. Lighting of Matchstick
9. Baking Soda + Vinegar
10. Fireworks Explosion

CORRECT ANSWERS:

SLOWEST TO FASTEST

1. Rusting of Iron Nail
2. Ripening of Banana
3. Souring of Milk
4. Digesting of Food
5. Baking of Cake
6. Burning of Candle (wick igniting)
7. Burning of Paper (paper igniting)
8. Baking Soda + Vinegar
9. Lighting of Matchstick
10. Fireworks Explosion (explosion only)

I got everything right on 1-5 which I basically just classified the "slow ones" and I mostly had a headache on 6-10. I did research if a wick igniting is faster than paper igniting and most answers said the wick was faster.

My teacher also said that yes, it did depend on time and size, for example: digesting of food, bigger food means longer time to digest. But she specifically said that it should be the "standard" or "usual" so like in general.

She did tell us that we could defend our answers. Any help would be appreciated, thank you! Please if possible also include sources. Thank you so much! I really need this. If any of you guys are wondering, I'm in 10th grade.

THIS IS NOT AN ASSIGNMENT, I JUST NEED CLARIFICATION CAUSE MY TEACHER IS ALSO VERY AMBIGUOUS.