A highway subgrade is 100km long and 50m wide. How many square kilometers and hectares does the highway subgrade cover? No wrong number

100000 * 50 = 5000000 square meters = 500 hectares = 5 square kilometers

When a road repair team builds a road, 5 / 8 of the total length of the road will be left after six days. At this speed, how many days will it take to complete the road?
process

Six days later, 5 / 8 of the total length remained
3 / 8 / 6 = 1 / 16 every day
5 / 8 △ 1 / 16 = 10 days after repair

Build a road, 8 days to build the midpoint of more than 98 meters, the rest of the original speed of 4 days to complete, this road a total of how long?

98X2÷（8-4）X（8+4）
=196÷4X12
=196X3
=588m

How to find the letter symbol of density

Density: density. The sign of density is ρ
density
The measured values are in grams per cubic centimeter (or kilogram per liter); the density of water is 1.0, iron is 7.9 and lead is 11.3
From a mathematical point of view, there are three situations:
(1) When ρ is constant, M is proportional to v;
(2) When m is constant, ρ is inversely proportional to v;
(3) When V is constant, ρ is proportional to M

Is slope and grade a concept?

Slope is an angle value
The grade is the tangent of this angle

Two substances have the same mass. If they are large in volume, their density must be proportional to their volume. How to judge?
If the mass of two substances is the same, and the volume is larger, the density must be proportional to the volume
If two substances have the same volume and larger mass, their density must be proportional to their mass
For the same substance, if its mass is large, its volume must be proportional to its mass
4 at one atmospheric pressure, the density of 4C pure water is? Gcm-3? Kgm-3
When the temperature rises, its volume? When the temperature drops, its volume?

If two substances are of the same mass, the larger the volume, the smaller the density
If two substances have the same volume and mass, they will have higher density, and the mass is proportional to the density
For the same substance, if its mass is large, its volume will be large, and its mass is proportional to its volume
4 at one atmospheric pressure, for 4C pure water, its density is the largest, and its volume density is the smallest, which is 1g.cm-3 = 1000kg.m-3
When the temperature rises, its volume increases, and when the temperature drops, its volume increases
Which point can be specified

What is the meaning of longitudinal slope, cross slope and ramp slope in the design of construction site?

The longitudinal slope is the length direction, and the transverse slope is the vertical direction. The slope is the slope with the slope less than 10%. The slope is the ratio of the horizontal dimension to the height dimension, which can be expressed as a percentage or a ratio. For example, a 10% slope can also be expressed as a 1:10 slope, which is the same principle

It's a physics problem about density, mass, volume
There is a statue whose size is similar to that of a real person. If its density is 8 × 10 cubic kg / m3, what is the mass of the statue?

The density of human is almost the same as that of water, 1000kg / m3
Its density is eight times that of human beings, and its mass is almost eight times that of normal people. Take your weight and multiply it by eight

Slope; the concept of aspect
Meaning of map sheet

As the name suggests, slope refers to the degree of slope. Aspect is defined as the projection direction of slope normal on the horizontal plane. In short, slope refers to the slope degree. Aspect refers to the orientation of terrain slope

How does the bulk density of a piece of copper change when heated in a furnace
How does the bulk density of a copper block change when it is heated in the furnace

When the mass remains unchanged, the volume becomes larger (thermal expansion and cold contraction) and the density becomes smaller (P = m / V)

A highway subgrade is 100km long and 50m wide. How many square kilometers and hectares does the highway subgrade cover? No wrong number