I can't understand where I am making mistake?
The qn is
A standing man, observes rain falling with velocity of 20 m/sat an angle of 30° with the vertical. Now if he further increases his speed, rain again appears to fall at 30° with the vertical. Find his new velocity.
I think the answer is meant to be 5/4. But I somehow got 85/4. Which part of my working is wrong?
I redid it and i know how to get the correct answer now, by using another method.
But i am curious why this certain specific working didnt work. Did i make a careless mistake? Did i break a weird rule i didnt know exist?
Im new to calculus and weak in this subject, so please be nice :(
Update: i managed to get it!! I found out that actually sin(5x)/5x as 5x approaches 0 would have been 1, not 5. same thing goes for sin(4x)/4x as 4x approaches 0
Now that honestly got me curious because I remember doing some other questions before, where I made sin(Ax)/Ax as Ax->0 = A, not 1, and i still got it right. I cant exactly remember the question but if i ever see it again, I'll post it here.
Thanks everyone!
I tried Combining the two equations given in the question, this resulted in
(a-6)x² + (2+a)x-6=0
x²-ax+4=0 (given)
These two equations have a common root alpha. USing Cramer's rule
(a²-5a+2)(2a-8)=(4a-18)²
a³-17a²+94a-170=0
How do I solve further? I am not able to calculate the roots of the cubic equation. Also acc to calculator there is only one real value of a that is 5. But the answer key says that there are three answers.
Also is there any other easier method to solve it??
I’ve been working on this packet forever and I’m just not confident in my answers. I’m confused on which formula to use for questions like 9 and 6 where it’s kind of like a pyramid but the base is a triangle. My friend used ai in class and got totally different answers than me—and it’s just frustrating me because I’m double and even triple checking my work and I just don’t get it. Please help!
Hello does anyone have creditable sources (primary and secondary sources work) that could help me on units 1 2 3 5 8. The prompt is “How is religion shown as a unifier or divider in history”.
This is for a project where we have to make a tin-man out of 4 shapes then cover it in tinfoil by calculating the surface area. I cant for the life of me figure out how you get the surface area of this shape. The sticky note is after i showed my teacher my original work and told me it was wrong so he gave me a head start and he said it shouldn’t be a big number but i keep getting answers in the thousands ☹️ How do i continue off from the sticky note plzz
im making a cross sections project with this equation using semi-circles, i need to fiind the dimensions of my cross section and use that to find the area of a cross-section
find volume of my solid by using intergration of cross section areas across the base of the solid
identfy material (using a foam board) to make the cross sectons, and note how many cross sections can be used based on thhe thickness of material.
idnntify the area/volume of eachh cross-section, and record this data in a table.
find the volume of the model for the solid created using cross-sections
compare the actual volume to the cross-sections volume and get a percent error
use the dimensions from step 4, construct each cross section from foam board
I am trying to solve the following problem:
Let f be a differentiable function on [0,1] such that f(0)=0 and f(1)=1. Prove that there exist two distinct numbers a,b in (0,1) such that
f'(a)f'(b)=1
By the Mean Value Theorem, I know that there exists some c in (0,1) such that
f'(c)=1
since
(f(1)-f(0))/(1-0)=1
But I do not know how to prove that there exists another point d different from c in (0,1) such that
f'(d)=1
Any hints or ideas?
I need to do this specific task, where i have to show how the body looks like from the left side perspective, the dotted line shows where the body is cut and the arrows show from which way you are supposed to look at it. I would apperciate it if someoine could show me how this would look like in a sketch or ecen just a explanation would be enough so I can understand what the task actually demands. thx in advance
Posting for an ESL friend who is helping her kindergartener with homework. I’ve got clue, tissue, rescue, blue (maddening that this is printed B&W), and glue. What is the last image? Kimbap doesn’t quite fit the lesson. 😆
I’m doing review for my exam today and have no clue how we went from:
sin squared theta plus 5 sin theta minus three
To
(2sin(x)-1)(sin(x)+3)
How did we do this??
I know she showed us this method using a giant x and something adds to something and something multiplied to something but I never learned that and I never grasped what to do.
Also if my solution is completely wrong then tell me.
This WebWorks exercise keeps saying I got the answer wrong. Unfortunately I don’t know which part I got wrong because it just says there’s an error, not where. I tried to change it from the t-test to a z-test in case they assumed normal distribution but that didn’t work either. I also tried rounding differently it still didn’t work. Can anyone help?
Read instructions carefully to understand.
“I tried solving it using relative motion and got -1m/s as velocity and speed is 1m/s, which seems wrong. Could someone give me just a hint on the correct approach?
for Ho is it = or ≤ ?
