Kepler's third law formula

Kepler's third law formula

wait a minute

Compulsory 1 Physical linear motion formula (to be explained in words)
All formulas of linear motion in Physics
All the formulas include: 1. Average velocity 3. Instantaneous velocity 4. Displacement 6. Free fall 7. Vertical throw
For example: v = s / T displacement / time
For example: v = s / T (displacement / time)

Velocity: v = s / T velocity = displacement / time acceleration: a = (vt-v0) / T acceleration = (initial velocity - final velocity) / time uniform linear motion: VT = V0 + at final velocity = initial velocity + acceleration × time when the initial velocity is 0, the above formula can be changed to vt = at final velocity = acceleration × time v = (V0 + VT) / 2 average velocity = (initial velocity

Who can write down all the formulas of Grade 8 to 9 according to the texts of Grade 8 to 9

Monovalent potassium sodium silver hydrogen chloride
Divalent oxygen calcium barium magnesium zinc
Three aluminum four silicon five valent phosphorus
Two three iron, two four carbon
All of them are complete
Copper mercury bivalent is the most common
Remember the combined price
Don't forget that all the elements are zero
Physics is too troublesome to write. Just buy a tutorial book

There should be necessary words and formulas
One circuit is connected in parallel with R1, R2, and the branch of R1 has an ammeter. It is known that the switch of R1 30 Ω and R20 Ω is closed, and the ammeter is 0.2A
1. Power supply voltage
2. Through the current in the trunk road

(1) The voltage of each parallel circuit is equal, that is, the voltage of the branch is the same as the supply voltage. The current of R1 branch is I = 0.2A, R1 = 30 Ω, so the total voltage = I times R1 = 0.2A x 30 Ω = 6V (2) the current in the main circuit of the parallel circuit is equal to the sum of the currents of the two branches. The current of R2 branch is the total voltage / r2 = 6V / 20 Ω

I didn't get it.
If Sina = 2 / 3, then the value of COS (90 degree - a) is_________
The answer is 2 / 3, please tell me how to calculate the problem?
Sina = 2 / 3, this is not a special angle, how to calculate

Typical formula
Sina = cos (90 degrees - a)

If a car travels 36 kilometers per hour from place a to place B, it can arrive in 8 hours. After driving at 36 kilometers per hour for a period of time, it takes 15 minutes to queue up for refueling. In order to arrive in place B within 8 hours, it must travel 7.2 kilometers per hour after refueling. How many kilometers is the gas station from place B?

1560 × 36 = 9 (km) 9 △ 7.2 = 1.25 (H) 1.25 × (36 + 7.2) = 54 (km) a: the gas station is 54 km away from B