3 years ago

What is the density of a block with a mass of 420 g and a length of 2cm, 3cm wide, and 1cm long

Mathematics

1 answer:

Basile [38]3 years ago

4 0

Answer:

Step-by-step explanation:

Find the volume first.

V= l * w * h

l = 2 cm

w = 3 cm

h = 1 cm

V = 2 * 3 * 1 = 6 cm^3

Density = mass / volume

Density = 420 grams / 6 cm^3

Density = 70 grams / cc^3

Kind of large. Check your givens.

You might be interested in

Y = 3 sin2x, y = 0, 0 ≤ x ≤ π; about the x−axis

Dominik [7]

I assume you're revolving the region with those bounds about the x-axis, and supposed to find the volume.

Via the disk method,

$\displaystyle\pi\int_0^\pi(3\sin2x)^2\,\mathrm dx=9\pi\int_0^\pi\sin^22x\,\mathrm dx$

Recall the half-angle identity for sine:

$\sin^2t=\dfrac{1-\cos2t}2$
$\implies\displaystyle\frac{9\pi}2\int_0^\pi(1-\cos4x)\,\mathrm dx$
$=\displaystyle\frac{9\pi}2\left(x-\frac14\sin4x\right)\bigg|_{x=0}^{x=\pi}$
$=\dfrac{9\pi^2}2$

8 0

3 years ago

The party planner has 126 flowers and 14 vases for arrangements. How many flowers per arrangement will there be? 9 14 140 1764

AleksAgata [21]

The answer in 9. 126 divided by 14

7 0

3 years ago

Read 2 more answers

Max finds the product of 3/7 x 16. Which statement is true

Alex787 [66]

It equals 48/7 or 6 6/7

8 0