Laws and theorems of Physics

Laws and theorems of Physics

1、 Four laws of Newtonian mechanics (the law of universal gravitation can also be counted as the law of Mechanics): 1. The first law of Newtonian mechanics - the law of inertia (the law of balance of space gravity field). 2. The second law of Newtonian mechanics - the law of acceleration of gravity (the law of change of space gravity field). 3. The third law of Newtonian mechanics - the law of force interaction

Derivation of physics formula in the first semester of senior one

Note: V is the average velocity 1, uniform acceleration Formula 1: known acceleration a, initial velocity V0, motion time t, displacement s any three to find another term; s = v0t + 1 / 2at ^ 2 because it is uniform acceleration, so the average velocity of its motion is (V0 + VT) / 2 = (V0 + V0 + at) / 2 = VO + 1 / 2at and S = VT = (vo

If the circumference of a sector is known to be C, what is the arc length of the sector, then it has the largest area? Find the largest area

Let the center angle of the circle be θ and the radius be r
c=2r+2πr*θ/2π=2r+rθ
Area s = π R ^ 2 * θ / 2 π = R ^ 2 θ / 2
Because 2R + R θ = C is a fixed value, when 2R = R θ = C / 2, 2R * r θ has a maximum value, 2R * r θ = C ^ 2 / 4
So s max = R ^ 2 θ / 2 = C ^ 2 / 16
The arc length is C / 2

It is known that in the equal ratio sequence {an}, all items are positive, and A1 = 1, a1 + A2 + a3 = 7, then the general term formula of the sequence {an} is an=______ ．

The general formula of A1 = 1, a1 + A2 + a3 = 7, A2 + a3 = 6, q + Q2 = 6, Q2 + q-6 = 0, q = 2, q = - 3 is an = 2N-1, so the answer is: 2N-1

To solve the equation: x minus nine tenths plus two fifths = three fourths x minus 0.24x = 7.98

(1) Multiply both sides of the equation by 20 to get 20x-18 + 8 = 15, x = 1.25 (2)

"Mom and dad really hard" composition!

Dad, mom, I would like to say thank you first! In order to thank you for your upbringing, I would also like to say, you have worked hard, in order to thank you for working hard for me. However, I still have some words from my heart, I want to take this opportunity to spit out. Mom and Dad, in peacetime, you are always ten

(- 2A's Square, b-3ab's square + 4AB) · half ab

^It's the power
(- 2A's Square, b-3ab's square + 4AB) · half ab
=(-2a^2b-3ab^2+4ab )·1/2ab
=(-2·1/2)a^(2+1)b^(1+1)-(3·1/2)a^(1+1)b^(2+1)+(4·1/2)a^(1+1)b^(1+1)
=-2a^3b^2-3/2a^2b^3+2a^2b^2

Solution equation: X: y = 2: 3 x: y = 2: 3 x: z = 5: 4 x + y + Z = 33

x :y= 2 :3=10:15
x :z =5 :4=10:8
x:y:z=10:15:8
x/10=y/15=z/8
order
a=x/10=y/15=z/8
x=10a,y=15a,z=8a
So x + y + Z = 33A = 33
a=1
therefore
x=10a=10
y=15a=15
z=8a=8

The surface area volume formula of cuboid and cube tells me

Cuboid surface area = two bottom areas + side area = 2 × (length × width) + 2 × (length × height) + 2 × (width × height)
Cuboid volume = length × width × height
Surface area of cube = 6 × (edge length × edge length)
Cube volume = edge length × edge length × edge length = cube of edge length

Given (1 + Tana) / (1-tana) = - 3
(1),(3sinA+2cosA)/(3sinA-2cosA)
（2）sinA*cosA
（3）3sin²A-cos²A

(1+tanA)/(1-tanA)=-31+tanA=3tanA-3==> tanA=2(1)(3sinA+2cosA)/(3sinA-2cosA)=(3sinA/cosA+2)/(3sinA/cosA-2)=(3tanA+2)/(3tanA-2)=(3×2+2)/(3×2-2)=2(2)sinA*cosA=sinA*cosA/(sin²A+cos²A)=tanA/(ta...