It's 10 centimeters in diameter and 8 meters long

It's 10 centimeters in diameter and 8 meters long

Look at the density... If the density is 1g / cm ^ 3 (the density of water), then what
The mass is (10 / 2) ^ 2 * π * 800cm * 1g / cm ^ 3 = 62831.8530708g, and the weight is about 62.8kg

The diameter of the small wood head is 10 cm and the length is 2.6 M. how can we find the square of this wood?
Please use the data I give, not the formula, because you can't understand it. Just add, subtract, multiply and divide it. When the length of wood is 2.6 meters, the bigger the diameter of the small head is, isn't the algorithm different? How to calculate the 1.3 meters? Is it the same as the 2.6 meters?

The algorithm of wood is not the same. Go and buy a volume table of wood. It has been calculated

In Cartesian coordinates, the set of points on the coordinate axis can be expressed as ()
A. {(x, y) | x = 0, y ≠ 0 or X ≠ 0, y = 0} B. {(x, y) | x = 0 and y = 0} C. {(x, y) | xy = 0} D. {(x, y) | x, y is not zero at the same time}

For a point (x, y) on the x-axis, there must be y = 0; for a point (x, y) on the y-axis, there must be x = 0, xy = 0. In a rectangular coordinate system, the set of points on the x-axis {(x, y) | y = 0}, in a rectangular coordinate system, the set of points on the y-axis {(x, y) | x = 0}, the set of points on the y-axis can be expressed as {(x, y) | y =

How many tons of cement, sand and stone should construction workers prepare 96T concrete with cement, sand and stone in the ratio of 2:3:5?

I will answer for you in two ways
Find a number first, then several
Total copies: 2 + 3 + 5 = 10
Number of copies: 96 △ 10 = 9.6 (T)
Cement: 9.6 × 2 = 19.2 (T)
Sand: 9.6 × 3 = 28.8 (T)
Stone: 9.6 × 5 = 48 (T)
A: 19.2 tons of cement, 28.8 tons of sand and 48 tons of gravel
According to the meaning of fractional multiplication, find the fraction of a number and calculate it by multiplication
2＋3＋5＝10
Cement: 96 × 2 / 10 = 19.2 (T)
Sand: 96 × 3 / 10 = 28.8 (T)
Stone: 96 × 5 / 10 = 48 (T)
A: 19.2 tons of cement, 28.8 tons of sand and 48 tons of gravel
(the above answers,)

Given a > 0. B > 0. And a (a + b) = 4, find the minimum of. 2A + B
If and only if a = a + B takes "=" sign, i.e. a = 2, B = 0, is it not contradictory to take "=" sign when b > 0

(2a+b)^2=4a^2+4ab+b^2
=4a(a+b)+b^2=4*4+b^2
The minimum value is when B ^ 2 = 0
Then the above formula = 16
2a+b=4

How many micrometers is one wire equal to?
I hope the prawns can provide the conversion method between them. Thank you

"Silk" is commonly known as "0.01mm" by mechanical workers. Workers with Shanghai Technology inheritance say "silk". In the north, they say "0.01mm" as "Dao". These two statements are clear in the industry
1 mm = 100 threads
Silk also called, not the silk rice in the unit system
Traditionally, the so-called silk is Hom, 1 silk = 1 Hom = 0.01mm = 0.00001m = 10 microns

When the volume ratio of N2, O2 and CO2 is 1:2:3, the volume of 100g is ()
A. 60LB. 30LC. 11.2LD. 112L

The volume ratio is equal to the mass ratio of substances. If the mass ratio of nitrogen is xmol, the oxygen is 2xmol and the carbon dioxide is 3xmol, so: xmol × 28g / mol + 2xmol × 32g / mol + 3xmol × 44g / mol = 100g. The solution is x = 100224mol, so under the standard condition, the volume of gas mixture is (100224mol

In the equation y = ax square + BX + C, when x = 1, y = 0; when x = - 1, y = 6; when x = 2, y = 3, find the values of a, B and C

According to the meaning of the title
a+b+c=0
a-b+c=6
4a+2b+c=3
It is necessary to solve this system of equations
a=2
b=-3
c=1

P (x0, Y0), parabola y = ax ^ 2, find p to parabola tangent equation (two)

As a result, the ax and\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\178; - ay0)] x0

Working process of four stroke gasoline engine cylinder

A cycle consists of four strokes, Or the piston moves in a straight line in one direction in the cylinder: 1. Intake stroke 2. Compression stroke 3. Power stroke 4. Exhaust stroke 1. Intake stroke the intake valve (L) opens the piston and moves downward. The mixture of fuel and air enters the cylinder when the piston moves to the minimum, When the piston moves to the top, the mechanical energy is converted into internal energy at the end of the compression stroke. 3. The spark ignites the mixed gas and the gas expands rapidly, 4. Exhaust stroke exhaust valve (R) opens and piston moves upward to exhaust the burned exhaust gas. When piston moves to the top, exhaust valve closes, which is easy to understand,