It took 3.5 hours for a train to travel the distance between two cities at a velocity of 120 km/h. How far did the train travel between the two cities?

Answer:

true

Explanation:

Answer:

1. True

2. False

3. True

4. True

5. False

Explanation:

v = f × /\

v = 17250 × 0.019

v = 327.75ms²

A produces a sound at a frequency of 17,250 Hz and wavelength of 0.079 m then the speed of sound will be equal to 327.75 m/s².

The distance between two identical locations (adjacent crests) in successive cycles is known as the wavelength, and it is used to describe waveform signals that are transmitted over wires or into space. Typically, in wireless systems, this length is specified in meters (m), centimeters (cm), or millimeters (mm). The wavelength is more frequently described in nanometers (nm), which are units of 10⁻⁹ m, or angstroms, which are units of 10⁻¹⁰ m, for infrared (IR), visible light (UV), and gamma radiation.

As per the given information in the question,

Frequency, f = 17,250 Hz

The wavelength λ = 0.019 m

Then the speed of the sound (v) will be,

v = f × λ

v = 17250 × 0.019

v = 327.75 m/s²

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Explanation:

a triple beam balance can measure the mass of one slice of bread

Answer:

C.

Explanation:

Hope It Helps

brainliest please

Answer:

C. police siren

Explanation:

Sound waves are mechanical waves

Answer:

C

Explanation:

So, lets start off by thinking about what we know is in both cells, and rule out from there.

There are just some basic things you need in eukaryotic cells, those include the following:

Here are jsut a few examples of what can be found in both plant and animal cells, however we can already rule out all of the following except for:

C

Because remember, c talks about the chlorplast, which is not the chlorplasm found in both plant anf animal cells, its just the chloroplast found in plant cells.

Although I gave the asnwer to you. Here are some things that are in plant cells that arent in animal cells:

Animal cells on the other hand, have a few things that plant cells do not as well:

Hope this helps! ;)

Answer:

[tex]\boxed {\boxed {\sf 130 \ Newtons }}[/tex]

Explanation:

Work is the energy transferred to or from an object when force is applied to cause displacement. It is the product of force and displacement.

[tex]W=F*s[/tex]

The displacement (s) is 8 meters and the work (W) is 1,040 Joules. Substitute these values into the formula.

[tex]1040 \ J= F* 8 \ m[/tex]

First, let's convert the units. This will make the question easier later on. 1 Joule is equal to 1 Newton meter, so the 1040 J of work equal 1040 N*m.

[tex]1040 \ N*m= F * 8 \ m[/tex]

Since we are solving for the force (F), we must isolate the variable. It is being multiplied by 8 meters and the inverse of multiplication is division. Divide both sides by 8 m.

[tex]\frac {1040 \ N*m}{8 \ m}= \frac{F * 8 \ m}{8 \ m}[/tex]

[tex]\frac {1040 \ N*m}{8 \ m}=F[/tex]

The meters cancel out, hence our earlier unit conversion.

[tex]130 \ N = F[/tex]

A force of 130 Newtons is used.

Answer:

t = 3 minutes

Explanation:

Given that,

Power of fan, P = 50 W

Energy used, E = 1 kWh

We know that,

Energy = Power/time

As, 50 watts = 0.05 kilowatts

So,

[tex]t=\dfrac{P}{E}\\\\t=\dfrac{0.05\ kW}{1\ kWh}\\\\t=0.05\ h[/tex]

or

t = 3 min

So, the required time is equal to 3 minutes.

Answer:

The third one is correst

Answer:

The second law: When a force is applied to a car, the change in motion is proportional to the force divided by the mass of the car. This law is expressed by the famous equation F = ma, where F is a force, m is the mass of the car, and a is the acceleration, or change in motion, of the car

Answer:

the answer is D acid don't turn paper red.

The one that is not a typical property of an acid is they react with all metals producing hydrogen. The correct option is D.

A substance that reacts with certain metals to produce salts and releases hydrogen ions into water.

Acids give certain dyes a reddish tint and have a sour flavour. Some body-produced acids, such as stomach acid, can support organ function. Hydrochloric acid is a kind of acid.

Acids and many metals, although not all, interact. As the metal combines with the acid to create a salt, hydrogen gas is created.

Acids and many metals, although not all, interact. As the metal combines with the acid to produce a salt, hydrogen gas is created.

The fact that acids react with all metals to produce hydrogen is the only characteristic of an acid that is unusual.

Thus, the correct option is D.

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Answer:

Lo primero que hay que recordar es la relación:

Velocidad = Distancia/tiempo.

Para el caso de Pedro, el vive a 5km de la escuela (es decir, para llegar a la escuela, el debe recorrer -5km, entonces la distancia es -5km), y recorre esa distancia en 0.25 horas, entonces su velocidad es:

Velocidad = -5km/0.25hr = -20km/h

Esto significa que Pedro se mueve con una velocidad de -20km/h, lo que significa que se mueve hacia el oeste con un módulo de 20km/h

Para el caso de Juan, el vive a -4km de la escuela, entonces el tendrá que recorrer 4km para llegar a la escuela, y los recorre en 0.25 horas, entonces su velocidad sera:

Velocidad = 4km/0.25h = 16 km/h

Lo que significa que Juan tiene una velocidad de 16km/h hacia el este.

Answer:

I think it is + and + I could be wrong but I hope it helps

Answer:

[tex]0.361\ \text{m}[/tex]

Explanation:

[tex]f_s[/tex] = Frequency of source = 375 Hz

[tex]\Delta f[/tex] = Difference between the maximum and minimum sound frequencies = 2.75 Hz

v = Speed of sound in air = 343 m/s

T = Time period = 1.8 s

[tex]v_m[/tex] = Maximum speed of the microphone

We have the relation

[tex]\Delta f=2f_s\dfrac{v_m}{v}\\\Rightarrow v_m=\dfrac{\Delta fv}{2f_s}\\\Rightarrow v_m=\dfrac{2.75\times 343}{2\times 375}\\\Rightarrow v_m=1.26\ \text{m/s}[/tex]

Amplitude is given by

[tex]A=\dfrac{v_mT}{2\pi}\\\Rightarrow A=\dfrac{1.26\times 1.8}{2\pi}\\\Rightarrow A=0.361\ \text{m}[/tex]

The amplitude of the simple harmonic motion is [tex]0.361\ \text{m}[/tex].

Answer: 14 speed of Earth around Sun I see 30 km/s. FALSE

15. Because car is in circle track, direction of velocity changes

And car is in accelerating motion. direction of acceleration points to

The centre of the circle. RIGHT

Explanation:

She is probably suffering from a major depression. Depression results in emotional change and loss of interest in previously appreciated activities.

Depression is a frequent and significant medical ailment that has an adverse effect on how you feel, think, and act. It can cause a number of mental and physical difficulties, as well as a loss in your ability.

According to epidemiological research, a hereditary element is involved in 30% to 40% of instances of bipolar illness. As a result, environmental influences have a larger role in the development of depression.

Maria's mother was deported 6 months ago, and she is staying with a cousin. She has to share a room with 3 other children and is very discouraged.

She has little energy to do much of anything, and she cries a lot, she is probably suffering from a major depression.]

Hence, option A is correct.

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Answer:

a

Explanation:

because red litmus paper turn blues under base or alkaline condition

Answer:

I assume you are referring to the standard atomic weight of the elements when you write atomic mass. No elements beyond uranium has a standard atomic weight. The reason is explained by the organization assigned responsibility for the assignment of standard atomic weights,the international Union of Pure and Applied Chemistry commission on isotopic abundances and atomic weights.

Explanation:

Mitochondria are essential parts of many eukaryotes, but they are useless without oxygen. Therefore, chloroplasts are extremely important. They produce breathable air for life. Root hairs are seen to not have chloroplasts as their job is to collect water and nutrients.

Answer:

Explanation:

The formula for KE is

[tex]KE=\frac{1}{2}mv^2[/tex] and we fill in to solve for KE:

[tex]KE=\frac{1}{2}(14)(7.0)^2[/tex] I used 2 significant digits in the velocity because 1 isn't accurate enough. Therefore, my answer will be rounded to 2 sig fig's:

KE = 340 J (rounded from 343). And we do the exact same thing in #2:

[tex]KE=\frac{1}{2}(5.0)(5.0)^2[/tex] (Used 2sig fig's for both the mass and the velocity) to get

KE = 63 J (rounded from 62.5)

Answer:

the center of the universe is in your mom's stomach. why do I keep seeing people wanting to look for a date. the f. u. c. k.?

Answer:

v = four-thirds pi 12 cubed.

Explanation:

A ball has a spherical shape. The volume of a spherical shape can be calculated using the following formula:

[tex]V = \frac{4}{3} \pi r^3[/tex]

where,

V = Volume of Ball = ?

d = diameter of the ball = length across the ball = 24 cm

r = radius of ball = d/2 = 24 cm/2 = 12 cm

Therefore,

[tex]V = \frac{4}{3}\pi (12)^3[/tex]

Hence, the correct answer is:

v = four-thirds pi 12 cubed.

Answer:

B They react with all metals producing hydrogen.

Explanation:

the other 40% is used to power the 60% making it only capable of 60% efficiency

Answer:

I think the answer is Milky Way

I hope this Will help you

Answer:

63360 mi/h

Explanation:

How to find the speed of an object

Calculate speed, distance, or time using the formula d = st, distance equals speed times time. The Speed Distance Time Calculator can solve for the unknown SDT value given two known values.

Time can be entered or solved for in units of second S (s), minutes (min), hours (hr), or hours and minutes and seconds (hh:mm: ss). See shortcuts for time formats below.

To solve for distance use the formula for distance D = st, or distance equals speed times time.

distance = speed x time

Rate and speed are similar since they both represent some distance per unit time like miles per hour or kilometers per hour. If rate r is the same as speed s, r = s = d/t. You can use the equivalent formula d = rt which means distance equals rate times time.

distance = rate x time

To solve for speed or rate use the formula for speed, s = d/t which means speed equals distance divided by time.

speed = distance/time

To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.

time = distance/speed

Therefore, the speed = 63360 miles per hour

= 63360 mi/h

Answer:

balance

Explanation: