Please help me !! i am tired i worked all day to bring my grade up whitch i did i just gotta do this last assiment I will give brainlsit when i wake up

Answer:

I) 57.5 m

Il) 50 m/s

Explanation:

Given that a boy stands at a certain distance from a large building and blows a whistle.

After 2.3s he hears the echo of the sound. The speed V of the sound will be:

V = 2X / T

Where X is the distance covered

V = 2X / 2.3

V = 0.87X ...... (1)

He moves 50m towards the building and blows his whistle again; this time the echo reaches him after 2.0s.

V = (2×50) / 2

V = 50 m/s

Substitutes the V into equation 1

50 = 0.87X

X = 50 / 0.87

57.5 m

Therefore, the Boys original distance from the building is 57.5m and the

Speed of sound in air is 50m/s

Answer:

Option C, 139 m/s

Explanation:

s = d/t

s = 500*10^3/3600

s = 138.8 = 139 m/s

How long it takes an object to move a certain distance if we know its average speed and the total distance it covers. As previously, it makes no difference whether the speed is constant or not; all that matters is the average distance travelled. Thus, option C is correct.

The object's average speed is the total distance it travels in a predetermined amount of time. A scalar value represents the typical speed. It is characterized by the magnitude and lacks direction.

A body's average speed is its mean value over a given amount of time. Since a moving body's speed fluctuates over time and is not constant, an average speed formula is required.

Therefore, s = d/t s = 500×10^3/3600 s = 138.8 = 139 m/s. Distance travelled divided by time passed equals average speed.

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How to convert m/sec into km/hr

1 m = 1/1000 km; 1 sec = 1/3600 hr

1 m/sec = 3600/1000 km/hr = 18/5 km/hr

To convert m/sec into km/hr, multiply the number by 18 and then divide it by 5.

Need detail explanation? Go to bottom

Solved Example 1:

Convert 20 m/sec into km/hr.

Solution:

20 m/sec

Step 1:

Multiply 20 by 18

We have 20 * 18 = 360

Step 2:

Divide 360 by 5

360/5 = 72

Final Answer:

20 m/sec = 72 km/hr

Try yourself: Practice Sheet 1

Solved Example 2:

Convert 36 m/sec into km/hr.

Solution:

36 m/sec

Step 1:

Multiply 36 by 18

We have 36 * 18 = 648

Step 2:

Divide 648 by 5

648/5 = 129.6

Final Answer:

36 m/sec = 129.6 km/hr

Try yourself: Practice Sheet 2

Better Understanding:

The problem can be solved using an unitary method.

A shopkeeper sells each pencil for 5 cents. How much do 4 pencils cost? 4 * 5 cents= 20 cents, isn't it? What is the cost of 7 pencils? Yes, your guess is right. It is 7 * 5 cents = 35 cents.

Let us work out the problem in example 1 as it explained here.

20 m/sec = 360/5 = 72 km/hr

Answer:

Electric potential energy, or Electrostatic potential energy, is a potential energy (measured in joules) that results from conservative Coulomb forces and is associated with the configuration of a particular set of point charges within a defined system.

Explanation:

Answer:

Displacement

Explanation:

Answer:

lol i went by 1 cubic inches and the answer i got was 91.3834

Explanation:

Answer:

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object. The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.

Answer:

yes that is correct

Explanation:

Answer:

You will reach both your arms out to break your fall and save your head.

Explanation:

It common sense you don't want your head injured. Do you?

Answer:

c. earth's shadow covering the moon

Explanation:

One thing that produces an eclipse is when Earth's shadow covers the moon and the moon and Sun's gravitational pull on each other. Option C is correct.

When the moon passes in front of Earth and the sun, it creates a solar eclipse and casts a shadow across the globe.

A solar eclipse can occur only during the new moon phase when the moon travels squarely between the sun and Earth and casts shadows on its surface.

Earth’s shadow covers the moon the gravity from the moon and Sun describes one event that causes an eclipse.

Hence option C is correct.

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Answer : The wavelength of the radio waves is [tex]6.2\times 10^{-2}m[/tex]

Explanation : Given,

Frequency = [tex]4.8\times 10^9 Hz[/tex]

Wave speed = [tex]3.0\times 10^8 m/s[/tex]

As we know that the speed of a wave is related to its frequency and wavelength.

Formula used:

[tex]\nu =f\times \lambda[/tex]

where,

[tex]\nu[/tex] is the wave speed in metres per second, (m/s )

f is the frequency in hertz, (Hz )

[tex]\lambda[/tex] is the wavelength in metres, (m)

Now putting all the given values in the above formula, we get:

[tex]3.0\times 10^8 m/s=(4.8\times 10^9 Hz)\times \lambda[/tex]

[tex]\lambda=6.2\times 10^{-2}m[/tex]

Therefore, the wavelength of the radio waves is [tex]6.2\times 10^{-2}m[/tex]

The wavelength of the radio waves is 0.063 m

From the question, we are to determine the wavelength of the radio waves.

From the formula,

[tex]c = f \lambda[/tex]

Then, we can write that

[tex]\lambda = \frac{c}{f} [/tex]

Where c is the wave speed

[tex]f [/tex] is the frequency

and [tex]\lambda [/tex] is the wavelength

From the given information,

[tex]f = 4.8 \times 10^{9} \ Hz [/tex]

and [tex]c = 3.0 \times 10^{8} \ m/s[/tex]

Putting the parameters into the formula, we get

[tex]\lambda = \frac{3.0 \times 10^{8} }{4.8\times 10^{9} } [/tex]

[tex]\lambda = 0.625 \times 10^{-1} [/tex]

[tex]\lambda = 0.0625 \ m [/tex]

[tex]\lambda = 0.063 \ m [/tex] (to 2 significant figures)

Hence, the wavelength of the radio waves is 0.063 m

Learn more on waves here: https://brainly.com/question/14015797

Answer:

PARABOLIC, EARTH, VERTICAL, INERTIAL ang PHYSICAL LAWS

Explanation:

In this exercise you are asked to complete the missing words.

When the steel ball falls on the constant speed car, it follows a PARABOLIC path in the reference frame fixed to EARTH, but a VERTICAL straight line in the reference frame of the constant speed car. Without a fixed frame of reference, you cannot tell whether or not you are in an INERTIAL frame of reference. All frames of reference that move at constant speed relative to each other are PHYSICAL LAWS__equivilent__.

\ r

Answer:

2

Explanation:

Answer:The number of electrons

Explanation:

Answer:

Universal service is an economic, legal and business term used mostly in regulated industries, referring to the practice of providing a baseline level of ser

Explanation:

From Google

Can I have brainliest

Answer:

It will take 6 seconds.

Explanation:

Answer:

it is gas to liquid

Explanation: ap3x

Answer:

75.56 m/s

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 0 m/s

Time (t) = 7.71 s

Acceleration due to gravity (g) = 9.8 m/s²

Final velocity (v) =..?

Thus, we can obtain the velocity (v) with which the pacifier hit the water as follow:

v = u + gt

v = 0 + (9.8 × 7.71)

v = 0 + 75.558

v = 75.558 ≈ 75.56 m/s

Therefore, velocity with which the pacifier hit the water is 75.56 m/s

Answer:

Explanation:

To find the time taken given the velocity and distance we use the formula

[tex]t = \frac{d}{v} \\ [/tex]

where

d is the distance

v is the velocity

We have

[tex]t = \frac{35}{45} = \frac{7}{9} \\ = 0.77777...[/tex]

We have the final answer as

Hope this helps you

Answer:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

[tex]f = m \times a[/tex]

f= force

m=mass

a=acceleration

Explanation:

examples:

riding your bicycle

•your bicycle is the mass, your leg pushing in pedals of your bicycle is the force

pushing a box

•the box is the mass, you are pushing the box

setting a pencil down in a table

•the pencil is the mass, you are puting the pencil down

Answer:

His third law states that for every action (force) in nature there is an equal and opposite reaction. In re-action, a thrusting force is produced on the engine mount. The thrust accelerates the rocket as described by Newton's second law of motion.

Explanation:

Answer:

The force the rocket exerts on the air is in the direction opposite to

the force that the air exerts on the rocket.

Explanation:

THE ANWER IS DEEZ NUT.Z

Answer:

The velocity of an object refers to the rate at which the object's position changes. For any given motion, it is possible that an object could move very fast yet have an abnormally small

Formula:

velocity = distance travelled in a straight line/ time taken

Answer:

True

Explanation:

idk

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

[tex]a = \frac{f}{m} \\ [/tex]

where

f is the force

m is the mass

We have

[tex]a = \frac{20}{2} \\ [/tex]

We have the final answer as

Hope this helps you

Answer: BUTT

Explanation: Because its a Cheek;)

The primary source of power for the wheel and axle in a remote-controlled car would be:

- Chemical energy from the batteries.

Chemical Energy

Learn more about "Wheel and Axle" here:

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Answer:

3:4

Explanation:

Answer:

True

Explanation:

Lose of water content in our body through sweating and lose of essential salts such as potassium and sodium causes heat cramps...

Thank you

Answer:

how you see something

Explanation: