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3 years ago

Please help!!!!! :)

Physics

2 answers:

kow [346]3 years ago

5 0

The answer is A because bases are greater than 7 and acids are lower than 7

Jlenok [28]3 years ago

4 0

What's up ? ! ? You should know most of these.

RbOH is a base because its PH is greater than 7.

Sulfur trioxide is SO₃ .

Mixtures B, C, and D can be separated by distillation.
Pebbles and sand can't.

If some salt is dissolved in a beaker of water, then
the salt is the solute and the water is the solvent.

The equation is not balanced because the number of atoms
of each element on the left is not equal to the number of atoms
of that element on the right.
In fact, the total number of all atoms on the left (8) is not even
equal to the total number of all atoms on the right (10).

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Jupiter's moon Io has active volcanoes (in fact, it is the most volcanically active body in the solar system) that eject materia

melisa1 [442]

Answer:

$H_2 = 91.55 km$

Explanation:

Gravity on the surface of planet is given as

$g = \frac{GM}{R^2}$

as we know that

$M = 8.93 \times 10^{22} kg$

$R = 1821 km$

now gravity on the planet is

$g = \frac{(6.67 \times 10^{-11})(8.93 \times 10^{22})}{(1821 \times 10^3)^}$

so we have

$g = 1.8 m/s^2$

now we know that

$H_{max} = \frac{v^2}{2g}$

so we will say

$\frac{H_1}{H_2} = \frac{g_2}{g_1}$

$\frac{500}{H_2} = \frac{9.81}{1.8}$

$H_2 = 91.55 km$

5 0

3 years ago

What do we call the days when the sun is directly overhead the equator?

NikAS [45]

Answer:

Equinox

Explanation:

It is an astronomical phenomenon that is repeated twice a year, in summer and winter, and that is caused because the axis on which our planet rotates is slightly inclined with respect to the plane of translation, this is its trajectory around the Sun.

For this reason there are two equinoxes a year, a phenomenon completely opposite to the solstice, but also marks the beginning of the spring and autumn seasons.

The equinoxes occur around March 20 or 21 and September 22 or 23, and it is the days when the Sun is exactly over the equator, which makes day and night more or less the same duration. The word ‘equinox’ comes from Latin and means precisely ‘same night’. In those two moments the part of the Earth closest to the Sun is the equator.

8 0

3 years ago

Part A

jok3333 [9.3K]

Answer:

Using 3 periods to get an accurate reading:

3T = (6.40 S - 0.90 s) = 5.50 S So, T = 1.83 s

m = 0.250 kg

Using algebra:

k= $\frac{4\pi ^{2}m }{T^{2} }$ = $\frac{4\pi ^{2}0.250 }{1.90^{2} }$ =2.95kg/sec