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3 years ago

IF U ANSWER I WILL MARK U BRAINLLIEST

Physics

2 answers:

notka56 [123]3 years ago

8 0

A) The density of a substance or object is a measure of how compact the mass is.
B) Objects that are more dense than water sink and those less dense float.
C) This weight-to-volume ratio is referred to as density. Water can support an object that is less dense than water, allowing it to float. An object that is denser than water sinks.
II A) These three elements are all metals, but they have different molecular masses, atomic weights, and atomic numbers. Similarly, all three of them have luster and are good conductors of electricity.

goldfiish [28.3K]3 years ago

6 0

Explanation:

a) Density is the amount of mass in a specific amount of volume

b) Some substances are less dense than water so will float and vice versa

c) The wooden plank has less density than water due to having larger volume and vice versa with the wooden block since volume and density are inversely proportional

II) (a) They are all metals

(b) water -> Compound

oxygen -> Element

Gold-> Element

Salt-> Compound

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Answer:

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Explanation:

Given that,

A ball is thrown horizontally from the top of a building and strikes the sidewalk after 2.8 s.

We need to find the height of the building. Let it is h.

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Using second equation of motion to find h as follows :

$h=ut+\dfrac{1}{2}at^2\\\\\text{Put u = 0 and a = g}\\\\h=\dfrac{1}{2}gt^2\\\\=\dfrac{1}{2}\times 9.8\times 2.8^2\\\\=38.41\ m$

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3 years ago

Read 2 more answers

395,000 meters in 9000

marta [7]

Answer:

43.88 meters per second

Explanation:

The computation of the speed is shown below:

As we know that

$Speed = \frac{Distance}{time}$

where,

Distance is 395,000 meters

Time is 9,000 seconds

Now placing these values to the formula

So, the speed is

$= \frac{395,000}{9,000}$

= 43.88 meters per second

As speed shows the relation between the distance and time and the same is to be considered i.e by applying the formula

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