What is the volume of three tons of kerosene? (the density of kerosene is equal to 0.8 times 10 to the third power kg / m3)

What is the volume of three tons of kerosene? (the density of kerosene is equal to 0.8 times 10 to the third power kg / m3)

ρ=m/V
So v = m / ρ = 3000kg / 0.8 * 10 ^ 3kg / m ^ 3 = 3.75m ^ 3
That is: the volume of three tons of kerosene is 3.75 cubic meters

A bottle can hold 1kg of water at most. How many kilos of kerosene is the mass of kerosene when you fill it with kerosene

Because they are all the same bottle, so the volume is the same. Let's set the volume of the bottle as v. because M = PV (the density symbol will not be ）Therefore, it is concluded that m water / M alcohol = P water / P alcohol = 1000 / 800 = 5 / 4. Since m water is known to be 1 kg, m alcohol =

What is the buoyancy of a 2700n aluminum block immersed in alcohol? The density of aluminum is 2.7 times the third power of 10, and the density of wine is 0.8 times the third power of 10

∵ immersion ∵ V al = V alcohol, so g Pai / g al = meat Pai / meat al
That is, f-floating = 2700n × 0.8 × 10 ^ 3 / 2.7 × 10 ^ 3 = 800N

If you arrange a pile of pieces into a square, there will be more than four pieces. If you add one layer in the vertical and horizontal directions of the square, there will be nine pieces missing. How many pieces do you have?

It turns out that each side (4 + 9 + 1) △ 2-1 = 7-1 = 6
A total of 6x6 + 4 = 40
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Mathematical problems of quadratic function,
Parabola y = AX2 + BX + C (a)

From the meaning of the title, it is concluded that:
-B / 2A = 1, so: B = - 2A
The analytical formula of parabola can be changed into:
y=ax^2-2ax+c.
By substituting x = - 1 and x = 2 into the analytical expressions, we get the following results
y1=a+2a+c=3a+c.
y2=4a-4a+c=c
Because a

For the image passing through the inverse scale function y = K / X (K ≠ 0) of point (5,1), we can find out the value range of Y by using the image; 1. When x ≥ 1, the value range of Y; 2. When y ＞ - 2, the value range of X

Substitute x = 5, y = 1 into y = K / X to get
1=k/5, k=5
So the analytic expression of inverse proportion function is y = 5 / X
The image of inverse scale function is in the first and third quadrants, and Y decreases with the increase of X
When x ≥ 1, 0 < y ≤ 5;
When y ＞ - 2, the image is in the third quadrant, X ＜ - 5 / 2; when y ＞ - 2, the image is in the first quadrant, X ＞ 0

Given (a − 12) 2 + | a + B + 3 | = 0, find the value of the algebraic formula (− A2 + 3AB − 12b2) − (− 2A2 + 4AB − 12b2)

Because (a − 12) 2 + | a + B + 3 | = 0, a − 12 = 0A + B + 3 = 0, the solution is a = 12, B = − 72; the original formula = (− A2 + 3AB − 12b2) − (− 2A2 + 4AB − 12b2) = − A2 + 3AB − 12b2 + 2A2 − 4AB + 12b2 = A2 AB, when a = 12, B = − 72, the original formula = (12) 2 − 12 × (− 72) = 14 + 74 = 2

7. As shown in the figure, in △ ABC, BC = 8cm, the vertical bisector of AB intersects AB at point D, the intersection AC at point E, the perimeter of △ BCE is equal to 18cm, then the length of AC is equal to 18cm
6. As shown in the figure, if one of the following conditions makes the parallelogram ABCD rhombic, it is ()
①AC⊥BD ②∠BAD=90° ③AB=BC ④AC=BD
A．①③B．②③C．③④D．①②③

AC=10
A

What's the square of a foot

One foot is a unit of length, and square is related to area

A trapezoid has an area of 24 square centimeters, a height of 6 centimeters, an upper bottom of 2.7 centimeters, and a lower bottom of? Centimeters

24 = 6 * (2.7 + x) / 2 trapezoidal area formula
x=5.3
Hope to help you~