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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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An Olympic track runner starts from rest and has an acceleration of 2.4 m/s2 for 3.6 s, then has zero acceleration for the remai

rjkz [21]

Answer:

The runner's speed at the following times would remain 8.64 m/s.

Explanation:

Acceleration definition: Acceleration is rate of change in velocity of an object with respect to time.

In this case, after 3.6 seconds the acceleration is zero, it means that the velocity of the runner after 3.6 seconds is not changing and it will remain constant for the remainder of the race. Now, we have to find the velocity of the runner that he had after 3.6 seconds and that would be the runner's speed for the remainder of the race. For this we use first equation of motion.

First equation of motion: Vf = Vi + a×t

Vf stands for final velocity

Vi stands for initial velocity

a stands for acceleration

t stands for time

In the question, it is mentioned that the runner starts from rest so its initial velocity (Vi) will be 0 m/s.

The acceleration (a) is given as 2.4 m/s²

The time (t) is given as 3.6 s

Now put the values of Vi, a and t in first equation of motion

Vf = Vi + a×t

Vf = 0 + 2.4×3.6

Vf = 2.4×3.6

Vf = 8.64 m/s

So,the runner's speed at the following times would remain 8.64 m/s.

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jok3333 [9.3K]

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borishaifa [10]

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4 years ago

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Mamont248 [21]

Answer:

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Explanation:

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miss Akunina [59]

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