Pls help
Qn 9,10,11

Qn 11
Answers,
a) 10g/cm3
b) 20g/cm3
c) 30g/cm3
d) 40g/cm3

Answer:Three elements make up over 99.9 percent of the composition of dry air: these are nitrogen, oxygen, and argon.

Explanation:

Answer: Air is an gaseous substance

Explanation:

Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures.

Answer:

The car would travel 60 miles in 2 hours.

Explanation:

The distance for an hour is already given, 30 miles per hour.

Given this you could multiply 30 by 2 which gives you 60.

The distance of the car is its speed times the time taken. The speed of the car is 30 miles per hour and time of travel is 2 hours. Then, the distance travelled is 60 miles.

Speed of a moving object is the measure of the distance travelled per unit time. The rate of speed is called velocity. Velocity of an object is a vector quantity.

As the object is covering more distance within small time, then the object is said to have greater speed. Speed of an object also depends on is mass.

Given the speed = 30 mph

time taken = 2 hours

distance  = speed  × time

= 30 × 2 = 60 miles.

Therefore, the distance travelled by the car is 60 miles.

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Answer:

its 882 J

Explanation:

the answer is D for edge

Sunday, July 20, marked 45 years since the United States put the first two astronauts safely on the moon. The cost for the Mercury, Gemini and Apollo programs was more than $25 billion at the time more like $110 billion in today’s world. The ensuing U.S. space efforts have cost an additional $196 billion for the shuttle and $50 billion for the space station. NASA’s total inflation-adjusted costs have been more than $900 billion since its creation in 1958 through 2014 (more than $16 billion per year). Looking back, have we gotten our money’s worth from the investment?

IamSugarBee

Explanation:

for me its teaching others. I find it really helpful to go over something then recite all the info to my mum or sister after without looking at notes to see how much I could remember

Answer: 1. Organisms are made of cells

2. Cells are the most fundamental unit of life

3. Cells come from other cells

Explanation:

Hope this helps!!

Answer:C.

Explanation:

The rate of change in velocity; speeding up, slowing down, or changing direction

Answer:

v_average = -0.025 m / s

the minus indicates that the velocity is to the west.

Explanation:

For this exercise we use the definition of average velocity

         v_average = (x₂-x₁) / Δt

Let's keep in mind that the velocity is a vector, so the displacement is

          x₂ - x₁ = 4 - 7 = -3

the minus indicates that the shift is to the west.

Let's calculate

           v_average = -3 / 120

           v_average = -0.025 m / s

the minus indicates that the velocity is to the west.

Answer:

It allows you to see fetuses before they are born.

Explanation:

because it has many helpful measures....

it helps in breaking and crushing the kidney stones...due to its high frequency....

Answer:

The displacement of the elevator between 8 s and 24 s is 6 m.

Explanation:

Given that,

Initial time = 8 s

Final time = 24 s

We know that,

Displacement :

Displacement is the difference between initial position and final position.

In mathematically,

[tex]D=x_{f}-x_{i}[/tex]

We need to calculate the displacement

Using formula of displacement

[tex]D=x_{f}-x_{i}[/tex]

Put the value from graph

[tex]D=15-9[/tex]

[tex]D=6\ m[/tex]

Hence, The displacement of the elevator between 8 s and 24 s is 6 m.

Answer:

See attached.

Explanation:

See attached.

Answer:

3

Explanation:

Answer:

2+1=3

Explanation:

cause why not

Answer:

yes x rays are like light rays the difference is that they v

can oass through stuffs

skin and fats doesn't block more of the x rays

Explanation:

why uv cannot go through it us dangerous causing skin disease and cancer,skin itchness and redness and ut is cumulative

Answer:

d

Explanation:

hi

Answer:

the answer is b The metaphor suggests that readers should explore poems in depth.

Explanation:

I got it right

Answer:

The answer is 10

Explanation:20 x 10 = 200

Answer:

nngh have

bjruh hjrhhj be rnrnnrnrnnnrnjrjnnnnnnnnrnrn n n and I was nrn

Explanation:

jbbbbbhhhjjnnnnnnnnnnjhvcc

Explanation:

Answer:

7.43 m/s

Explanation:

Time taken for car to stop = 7.0 s

distance traveled before coming to rest = 26 m

Final speed of the car = 0 m/s (since it stops)

initial speed of the car = ?

To get the final speed, we use the equation

s = [tex]\frac{1}{2}t(u + v)[/tex]

where

s is the distance traveled before stopping

u is the initial speed = ?

v is the final speed = 0 m/s

t is the time = 7 s

substituting values, we have

26 = [tex]\frac{1}{2}*7*(u + 0)[/tex]

26 = 3.5u

u = 26/3.5 = 7.43 m/s

Answer:

Energy is the ability to do work.

Explanation: Work is just the act of displaying something by applying force.

Question:

A race car starts from rest and speed up uniformly to the right until it reaches a maximum velocity of 60m/s in 15 secs

Answer:

4m/s²

Explanation:

The acceleration of a body in uniform motion can be found by using one of the equations of motion as follows;

v = u + at         ------------------(i)

Where;

v = final velocity of the body

u = initial velocity of the body

a = acceleration of the body

t = time taken for the motion

From the question, the body is the race car and has the following:

v = 60m/s²

u = 0 [since the car starts from rest]

t = 15 secs.

Now, substitute these values into equation(i) as follows;

60 = 0 + a(15)

60 = 15a    [Divide through by 15]

[tex]\frac{60}{15}[/tex] = [tex]\frac{15a}{15}[/tex]

a = 4

Therefore, the acceleration of the race car is 4m/s²

Answer: 1035

Explanation:

Answer:

Particles of electromagnetic radiation exhibit wave behavior

Electromagnetic radiation includes visible light

The specific amount of energy a particular photon possesses is called a quantum

Explanation:

Electromagnetic waves propagate through space perpendicularly to a oscillating magnetic and electric field producing it. Both of these fields oscillates perpendicular to one another, and to the direction of propagation of the wave.

Electromagnetic waves exhibit both wave and particle light behaviors, this phenomenon is known as the wave-particle duality.

Visible light is part of the broad spectrum of waves in the electromagnetic wave spectrum. And each particle of an electromagnetic wave is known as a photon, and they carry energy in discrete amounts called quantum.

Electromagnetic radiation occurs when electric and magnetic fields emit radiations that travel in waves. Given this explanation, the options that correctly describe electronic radiation are;

Electromagnetic radiation is used to explain the disturbance that occurs when the electric and magnetic fields travel at the speed of light.

There are different frequencies of radiation that are emitted in the process. Some have high and low energies.

The radio waves, ultraviolet rays, and visible light are all examples of electromagnetic radiation

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Answer:

636

Explanation:

Answer:

4.45 g/mL

Explanation:

to get density, you simply divide the volume by the mass, so your equation would look like p= 53/12

P being density, which is what you are solving for! Hope this helps!!

Answer:

True

Explanation:

Answer:

True is the correct answer

Explanation:

i took the test

Answer:

Matter can exist in one of three main states: solid, liquid, or gas. Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles.

Key Takeaways: Examples of Solids, Liquids, and Gases

A solid has a defined shape and volume. A common example is ice. A liquid has a defined volume, but can change state. An example is liquid water.There are four natural states of matter: Solids, liquids, gases and plasma. The fifth state is the man-made Bose-Einstein condensates. In a solid, particles are packed tightly together so they don't move much.

Explanation:

Answer:

Two teams are playing tug of war. Team A pulls to the right with a force of 450 N. Team B pulls to the left with a force of 415 N

Answer:

A. 35 N to the right.

EXPLANATION: 450 is going to the right so you subtract what is going against it. Which gives you 35. And because 450 is bigger than 415, it'll be going to the right.  

◈ Average speed is measured as the ratio of total distance travelled to the total time taken.

Given : d = 10km and t = 40min

To Find : Vav

_________________________________

፨ Conversion :-

60 min = 1 h

40 min = 40/60 = 2/3 h

[tex]:\implies\sf\:V_{av}=\dfrac{d}{t}[/tex]

[tex]:\implies\sf\:V_{av}=\dfrac{10\times 3}{2}[/tex]

[tex]:\implies\sf\:V_{av}=\dfrac{30}{2}[/tex]

[tex]:\implies\:\boxed{\bf{\orange{V_{av}\:15\:kmph}}}[/tex]

Answer:

less than

Explanation:

Given;

mass of the person, m = 100 kg

acceleration due to gravity, g = 9.8 m/s²

The reading on the scale is determined by applying Newton's second law of motion;

R = mg - ma

R = m(g-a)

at constant velocity, the acceleration is zero

a = 0

R = m(g-0)

R = mg

R = 100 x 9.8

R = 980 N

Thus, the scale reading is equal to the weight of the person but less than 1000 N

Answer:

12mph in 2hrs and 3mph in 0.5hrs the total distance would be 12*2 and 3*0.5 which would be 24 and 1.5 so we add those 24+1.5= 25.5. The answer would be 25.5