Help Not Sure What Is Wrong

I'm not sure what I'm doing wrong, please help with Chemistry?

E
A
B
G

I think maybe your trouble with the first one has to do with "subatomic particles", which means protons, neutrons and electrons total. So to count the subatomic particles add the mass number and the atomic number, which in the case of the given 116/50 Sn is 166. So then you need to find the atom of In that also has that sum equal to 166, which is 117/49 In.

Please help??? I am not sure what I did wrong?

The friction force produces the torque that causes stone to stop moving.
Ff = -μ * 260
Toque = -Ff * r
r = 0.255 meter
Toque = -μ * 66.3

Torque = I * α
For a solid disk, I = ½ * m * r^2 = ½ * 50 * 0.255^2 = 1.65625

As the stone rotates one time, it rotates an angle of 2 π radians. On minute is 60 seconds.
1 rev/min = π/30 rad/s
ω = 900 * π/30 = 30 * π
This is approximately 94.2 rad/s.

To determine the angular acceleration, use the following equation.

ωf = ωi + α * t
0 = 30 * π + α * 7.90
α * 7.90 = -30 * π
α = -30 * π ÷ 7.9
This is approximately negative 11.96 rad/s^2

Torque = 1.65625 * -30 * π ÷ 7.9 = -48.76875 * π ÷ 7.9
This is approximately negative 19.4 N * m

-μ * 66.3 = -48.76875 * π ÷ 7.9
μ = (-48.76875 * π ÷ 7.9) ÷ 66.3
This is approximately 0.3

Not sure why I got this wrong? Please help?

Phillip deposited $450 in an account that earns %5 interest, compounded yearly. If he makes no further deposits, how much will be in the account after 2 years?

I'm not sure if I did this correctly.

I=p.r.t

I=450(%5)(1)
I=450(0.05)(1) = 22.5 New principal = 472.5
22.5+450= 472.5

Year 2

I=472.5(%5)(1)
I=472.5(0.05)(1) = 236.25 x 2 = 472.5 - Back to my original answer.

The answers given by my book are :

A. $472.50
B. $491.14
C. $496.13
D. $512.24

I thought the answer was A, but the book is telling me it's C?

I'm not sure what I did wrong. can someone please help?

I'm not sure what's wrong? Help! I think something's really wrong?

Okay so I have Major Deppersive disorder (moderate), im 13, and I'm in weekly therapy. But lately I've been having these burst of painic, I just want to run and never look back. It's really scary. It happens anytime, sometimes it will wake me up at 2 in the morning, or when I'm in science class. They will usually last until I can control my breathing. I would normally talk to my doctor, but she's out of the country for the next week and a half. Pease help. I'm scared.

Math help! I'm not sure how to do it, help me please!?

I'm not sure how to do this... The problem says:
Belinda is jumping on a trampoline. After 4 jumps, she jumps with an initial velocity of 17 feet per second. The function d(t) = 17t - 16t^2 gives the height in feet of Belinda above the trampoline as a function of time in seconds after the fifth jump. How long after her fifth jump will it take for her to return to the trampoline again?

Algebra help not sure how to start the problem?

If Angel has 18 ft to work with (and we assume he won't waste any) He need the 18 feet to wrap around all four sides of the rectangle. we can say the width is = w, and the length is twice that size, 2w. With that in mind write an expression for the perimeter and then set it equal to the 18 ft.

Can someone help me with this accounts, not sure where I went wrong?

The 2020 accounting records of Blocker Transport reveal these transactions and events.

Payment of interest $10,200 Collection of accounts receivable $190,300
Cash sales 49,000 Payment of salaries and wages 57,700
Receipt of dividend revenue 17,400 Depreciation expense 16,800
Payment of income taxes 15,600 Proceeds from sale of vehicles
11,300
Net income 37,500 Purchase of equipment for cash 22,500
Payment of accounts payable Loss on sale of vehicles 2,700
for merchandise 114,200 Payment of dividends 13,100
Payment for land 74,300 Payment of operating expenses 28,700

Prepare the cash flows from operating activities section using the direct method.