Pls help I rlly don’t understand

Answer:

Micro waves and radio waves are electromagnetic waves while ocean wave  and seismic wave are mechanical waves.

Explanation:

Electromagnetic waves do not require a medium for propagation. They can travel along vacuum just like they travel through matter.

Further examples of electromagnetic waves are x rays, infrared waves etc.

Spectrum of electromagnetic waves in the increasing order of frequency is radio waves, microwaves, infrared waves, visible light, ultraviolet, x ray, gamma ray.

Mechanical waves require a medium for propagation. Thus they cannot travel through a vacuum.

Sound wave is an example of mechanical wave.

Final answer:

Microwaves and radio waves are electromagnetic waves that do not require a medium to travel, whereas ocean waves and seismic waves are mechanical waves that require a medium for their propagation.

Explanation:

Waves can be broadly classified into two categories: mechanical waves and electromagnetic waves. This classification is based on whether the waves require a medium to travel through or not.

To summarize, microwaves and radio waves are electromagnetic in nature, capable of traveling through a vacuum, whereas ocean waves and seismic waves are mechanical, needing a medium to propagate.

Answer:

The mechanical advantage of the system is equal to 19.62

Explanation:

The ratio of the force produced by a machine to the force applied to it is called mechanical advantage. In other words it is the ratio of output force to the input force.

In this problem mass=200kg

applied force=100N  

input force=100N

output force=[tex]mg=200 \times 9.8=196N.[/tex]

mechanical advantage [tex]MA= \frac{1960}{100}=19.6[/tex]

It gives an idea about the efficiency of a mechanical device. It is indeed a measure of force amplification. In block and tackle system an assembly of ropes and pulleys is used to lift loads. When the moving block is supported by a  greater  number of rope sections the force amplification will be more.

Answer:

19.6

Explanation:

MA=Ouput/Input

To get output value multiply; 200 (which is the mass) * 9.8 (which is gravity)

So, 200*9.8=1960N

Input is 100 because that is the force you are putting into the bag

Back to our formula MA=Output/Input, enter in our values...

MA=1960/100

Now divide 1960/100=19.6

MA=19.6

(no units; they cancel out).

Answer: [tex]d < a < c < b[/tex]

[tex]3.3 cm < 400 mm < 170 m < 22 km[/tex]

Explanation:

Firstly, let's convert these length to meters [tex]m[/tex], in order to work with the same units:

a. 400 millimeters

[tex]400 mm \frac{1m}{1000 mm}=0.4 m[/tex]

b. 22 kilometers

[tex]22 km \frac{1000m}{1 km}=22000 m[/tex]

c. 170 meters

Here the lenght is already in meters

d. 3.3 centimeters

[tex]3.3 cm \frac{1m}{100 cm}=0.033 m[/tex]

Now that we have all the lengths in meters, we can order them from shortest to longest:

[tex]0.033 m < 0.4 m < 170 m < 22000 m[/tex]

or

[tex]d < a < c < b[/tex]

Answer:

About 8.3 minutes

Explanation:

Use the formula for velocity as the distance covered by the light divided the time it takes: [tex][tex]velocity=\frac{distance}{time}[/tex][/tex]

Use the information about the speed of light in vacuum: [tex]300000000 \frac{m}{s} = 3*10^{8} \frac{m}{s}[/tex]

and the information you are given regarding the distance between Sun and Earth: [tex]1.5 * 10^{11} m[/tex]

to solve the first velocity equation for the unknown time "t":

[tex]velocity=\frac{distance}{time} \\3*10^8\frac{m}{s} =\frac{1.5*10^11 m}{t} \\t=\frac{1.5*10^11 }{3*10^8} s= 500 s[/tex]

we can convert second into minutes by dividing by 60: 500 s = 500/60 minutes = 8.3333... minutes

Answer: Somewhere with high temperatures.

Explanation:

Answer:

Because the material is meant to coat roofing shingles to keep houses cooler, the material should be marketed in areas that have high temperatures.

Explanation:

For this case we have that by definition, physical power refers to the amount of work done for a unit of time.

So:

[tex]P = \frac {W} {t}[/tex]

Where:

W: It's the work

t: It's time

The power units are in [tex]\frac {Joules} {s} = Watts[/tex]

So, according to the problem data we have:

[tex]P = 100W\\t = 120s[/tex]

Clearing the work of the formula:

[tex]W = P * t\\W = 100 * 120 = 1200[/tex]

Thus, the work is 1200 joules.

Answer:

Option C

Radium has a half-life of 1,660 years.The number of years until only 1/16th of a sample remains is 6641 years.

Answer: 6641 years

Explanation:

Given that the half-life of Radium is 1660 years. The number of years to be calculated when the sample of radium could just be remained of 1/16th of its part, which can be calculated by the following means,

Half life,  [tex]T_{1 / 2}=1660 \text { years }[/tex]

[tex]\frac{N}{N_{0}}=\frac{1}{16}[/tex]

t is the taken time, then,

[tex]\frac{N}{N_{0}}=e^{-\lambda t}[/tex]

[tex]\frac{N}{N_{0}}=e^{\lambda t}[/tex]

Taking ln on both sides, we get,

[tex]\lambda t=\ln \left(\frac{N}{N_{0}}\right)[/tex]

[tex]t=\frac{1}{\lambda} \ln \left(\frac{N_{0}}{N}\right)[/tex]

[tex]=\frac{T_{1 / 2}}{0.693}\left(\ln \left(\frac{N_{0}}{N}\right)\right)[/tex]

By substituting the given values,

[tex]t = \frac{1660}{0.693}(\ln 16)[/tex]

Therefore, t = 6641 years

Answer:

2.4 kg

1 kg = 10N

2.4 kg = ?

2.4 kg = 24N

On the moon 1/6th

1/6 * 24 = 4N

therefore weight of the textbook on the moon would be 4N

Answer:

True, the statement is correct

Answer:

True

Explanation:

Weather: It is the atmospheric condition for a small area over a short span of time. For example: cloudy weather. If one place is witnessing this condition it may or may not be same for all the places.

Climate: It refers to the atmospheric condition of an area over a long period of time for say a decade or a century. For example: the climate of the polar region is changing drastically and resulting in the reduction of glacial ice.

Answer:

a=0.27637 m/s²

Explanation:

Hello,

You should remember that ;

Stopping distance=reaction distance + braking distance

First find the reaction distance which is that distance traveled from point of detecting danger to start of breaking process.

Formula: d=(s*r) where s is speed in m/s and r is reaction time in seconds

Given: s=12m/s  and r=0.79 s

d= 12*0.79=9.48 m

Remaining distance to cover and stop

Where distance from locomotive to railroad crossing is 260, then remaining distance will be;

270m-9.48m=260.52 m

To get magnitude of minimum deceleration to avoid an accident you apply the formula:

v²=u²-2as

where

v= final speed = 0 m/s

u=speed of locomotive = 12 m/s

a=acceleration in m/s²

s=remaining distance to cover

v²=u²-2as

0²=12²-2*a*260.52

0=144-521.04 a

144/521.04= 521.04/521.04a

a=0.27637 m/s²

Hope this Helps!

Answer:

Vector quantity

Explanation:

physical quantity that has both magnitude and direction is called vector quantity.

Answer:

Vector

Explanation:

A vector is a quantity that is composed of a magnitude and a direction.

Some examples of vectors are forces. A force has a magnitude that indicates how large or small it is, and also has a direction that indicates where this force is being exerted.

Another popular example of a vector is velocity.

Answer:

6

Explanation:

Answer:

B) chemical potential energy

Explanation:

Your body uses chemical energy from the food you eat to power your motion.

Answer: the answer is air gradient

Explanation:

Answer:

Redshift and blueshift show how light shifts to shorter or longer wavelengths as objects in space move closer of farther away from us. People looking at an object that is moving away from them see light that has a longer wavelength than it had when it was produced (a redshift), while people looking at an source coming closer see light that is shifted to shorter wavelength (a blueshift).

Answer:

√(r³ / (MG))

Explanation:

The dimensions of each variable are:

r = [m]

G = [m³/kg/s²]

M = [kg]

Multiplying M and G eliminates kilograms:

MG = [m³/s²]

The radius cubed divided by MG eliminates meters:

r³ / (MG) = [s²]

The square root gives us seconds:

√(r³ / (MG)) = [s]

Kepler's third law relates the time  period of a planet to its orbital radius r, the gravitational constant G  and the mass of the sun M, the combination of these factors gives the correct dimensions for the period of a planet would be √( 4πr³/GM)

There are three laws of Kepler as follows

The orbit of the planet is elliptical and the sun is present at one of the two focuses of the elliptical path followed by the revolving planet.

A line segment joining a planet and the Sun covers equal areas during equal intervals of the time period.

The square of a planet's orbital period is proportional to the cube of the length of the semi-major axis of its elliptical orbit.

Think about a small mass M traveling in a circle around a large mass M. The centripetal force for mass m comes from gravity. Taking circular motion as an example and applying Newton's second law,

gravitational force balances the centripetal force

GMm/r²  = mv²/r

GM/r = v²/r

Let us take a Time period of the orbital is P

v = 2πr/P

GM/r = 4πr²/P²

P² = 4πr³/GM

P = √( 4πr³/GM)

Thus the correct dimension for the time period in terms of the orbital radius (r), gravitational constant (G ), and the mass of the sun (M) would be √( 4πr³/GM).

Learn more about Kepler's laws of planetary motion

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Answer:

I guess that the answer is plants play a vital role In the water cycle.

Answer:

Plants play a vital role in the water cycle.

Explanation:

Vegetation plays an important role in the water cycle by preventing soil erosion and increasing groundwater levels. In areas with thick vegetation cover, the foliage cover breaks the force of precipitation falling on the ground, which may otherwise cause erosion.

Answer:

running or skipping

Explanation:

feelin yourself and talking to quiet

just stay still and talk with a decent voice but no too loud

Answer:

Look to the explanation

Explanation:

Average velocity: is the average rate of change of displacement with

respect to time

Average velocity is a measure for distance traveled in a given time

We can calculate the average velocity by the rule [tex]v=\frac{s}{t}[/tex]

where s is the displacement and t is the time

Instantaneous velocity: is the velocity of an object in motion at a

specific point (x , t)

instantaneous velocity is the limit of velocity as the change in time

approaches zero

We can calculate the instantaneous velocity by the rule [tex]v=\frac{ds}{dt}[/tex]

Average velocity is equal to the instantaneous velocity when

acceleration is zero

Answer:

22050 J

Explanation:

Given Mass of the ball, m = 4.5 Kg

Height, h =500 m

Acceleration due to gravity, [tex]g= 9.8m/s^{2}[/tex]

To calculate the potential energy we use formula,

[tex]PE = mgh[/tex]

Substituting the given values, we get

PE = 4.5× 9.8×500

    =22050 J

The potential energy loss for a 4.5 kg bowling ball rolling down a 500m hill would be approximately 221325 Joules in an idealized scenario.

The potential energy loss of an object rolling down a hill can be calculated using the formula for gravitational potential energy, PE = mgh, where m is the mass of the object, g is the gravitational acceleration (9.81 m/s² on Earth), and h is the height of the hill. So, for a 4.5 kg bowling ball rolling down a 500m hill, the potential energy loss would be PE = (4.5 kg) * (9.81 m/s²) * (500 m), which equals 221325 Joules. However, it's important to note that this is an idealized calculation and in real scenarios some of this energy would be transferred into other forms such as kinetic energy as the ball speeds up, and thermal energy due to friction.

Relevant concepts: Potential Energy, Kinetic Energy, and Gravitational Potential Energy.

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Answer:

A scientist examines the results and answers the lab question.

Also in the conclusion write down what you learned from the experiment.

Answer:

the dude above me is right

Explanation:

he right

Answer:

Vertical position of the rock after 2 seconds = 11.46 m

Horizontal position of the rock after 2 seconds = 13.06 m

Explanation:

Initial height = 25 m

Angle of throw = 25 degrees

Velocity of throw = 7.2 m/s

Horizontal velocity of throw = 7.2 cos 25 = 6.53 m/s

Vertical velocity of throw = 7.2 sin 25 = 3.04 m/s

Acceleration in horizontal direction = 0 m/s²

Acceleration in vertical direction = -9.8 m/s²

Vertical position of the rock at t = 2 seconds

We have equation of motion s = ut + 0.5at²

                                     s = 3.04 x 2 - 0.5 x 9.81 x 2²

                                     s = -13.54 m

Vertical position = 25 - 13.54 = 11.46 m

Horizontal position of the rock at t = 2 seconds

We have equation of motion s = ut + 0.5at²

                                     s = 6.53 x 2 + 0.5 x 0 x 2²

                                     s = 13.06 m

Horizontal position = 13.06 m

Vertical position of the rock after 2 seconds = 11.46 m

Horizontal position of the rock after 2 seconds = 13.06 m

The meteor accelerates is the true statement about motion when it is approaching Earth.

Answer: Option B

Explanation:

Meteor is referred as the rock or a body made of metal wandering in space. The earth has gravitational pull and when any object or anything comes by, it gets accelerated.

Similarly when a meteor approached the earth, it gets pulled by gravitational force acting upon the earth and it gets accelerated and is forced to move into the earth's field.

Answer:

the meteor accelerates

Answer:

a) 6 m/s

b) 14 m/s

Explanation:

Acceleration is change in velocity over change in time.

a) a = Δv / Δt

2 m/s² = (v − 4 m/s) / 1 s

v = 6 m/s

b) a = Δv / Δt

2 m/s² = (v − 4 m/s) / 5 s

v = 14 m/s

Answer: number 2 I think is d all of the above

Explanation: the teacher explained it to the class that.

1). C

2). D

3). B

4). A

5). D

6). B

7). C

8). A

9). B

10). B

Answer:

Within a compound machine, the output force of one simple machine becomes the input force of another simple machine.

Answer:

The mass of the person would remain 600kg.

Explanation:

mass refers to the amount of matter in a particular object. therefore even though the moon has less gravitational force than the Earths, it still would have the same mass since the person is made up of the same amount of matter on Earth and in the moon.

when asked about weight, it would be 1000N. but in mass , same 600kg.

Answer:

a,d,e

Explanation:

all of those are true for it orbits the earth witch orbits the sun

the moon has no atmosphere for if it did then there would be a higher chance for water and plants on the moon

the moon is less deans than the earth and its gravitational pole is 1.62 m/s^2

and in your text book it says Tides are the daily rise and fall of sea level at any given place. The pull of the Moon’s gravity on Earth is the primary cause of tides and the pull of the Sun’s gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon’s pull is about twice that of the Sun’s

Answer:

A. B. D. E.

Explanation:

all of those are true for it orbits the earth witch orbits the sun

the moon has no atmosphere for if it did then there would be a higher chance for water and plants on the moon

the moon is less deans than the earth and its gravitational pole is 1.62 m/s^2

and in your text book it says Tides are the daily rise and fall of sea level at any given place. The pull of the Moon’s gravity on Earth is the primary cause of tides and the pull of the Sun’s gravity on Earth is the secondary cause. The Moon has a greater effect because, although it is much smaller than the Sun, it is much closer. The Moon’s pull is about twice that of the Sun’s.

Answer:

reservoir.     C

Explanation:

Just took the test on edge 2020

A large natural or human-made lake used to supply water is a reservoir.

A reservoir is a large area of land or even a container where things especially water is stored for future use.

A reservoir of water can be natural or man-made.

It is usually found underground or on the surface.

Therefore, a large natural or human-made lake used to supply water is a reservoir.

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Answer:

2.5 m/s

0 m/s

Explanation:

Average speed is distance over time.

Average velocity is displacement over time.

The bicycle travels 150 meters from A to B, then 150 meters from B to A.  So the distance is 300 meters and the displacement is 0 m.

s = 300 m / 120 s = 2.5 m/s

v = 0 m / 120 s = 0 m/s