what external force, fapplied, must be applied to the rail to keep it moving to the right at constant speed v? give both the magnitude and direction of fapplied.

Answer:

Displacement can be calculated by measuring the final distance away from a point, and then subtracting the initial distance. Displacement is key when determining velocity (which is also a vector). Velocity = displacement/time whereas speed is distance/time. I hope it helped. Please give brainliest

Explanation:

The amount of water vapor in the air is 90% of what the air can hold at 70 degree temperature, can be concluded from "air temperature is 70 degrees, and the relative humidity is 90%" .

The relative humidity is a way to quantify the amount of moisture (water vapor) in the atmosphere. The ratio of the partial pressure of water vapor in the air to the vapor pressure of water at that specific temperature is what is used to describe it.

Percentage relative humidity = Partial pressure of water vapor in air/ vapor pressure of water × 100%

So, The air temperature is 70 degrees, and the relative humidity is 90% can be concluded as at 70 degrees temperature, the partial pressure of water vapor in the air is 0.9 times greater than that of water. In other words, the amount of water vapor in the air is 90% of what the air can hold at that temperature.

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The ratio of copper and aluminium resistance is 0,596 .The resistance of a wire depends on its material, length, cross-sectional area, and temperature. The resistivity of copper is lower than that of aluminum, which means that copper wire has a lower resistance than aluminum wire of the same length and diameter.

In this case, both wires have the same length and diameter (cross-sectional area), so the ratio of their resistances is simply the ratio of their resistivities.

The ratio of the resistances of the copper and aluminum wires is approximately 0.596.

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A man who is travelling at 8.5 m/s on his bicycle will slow down to force -2.8 m/s when a car cuts in front of him, stopping in 3 seconds after travelling distance 13 m.

Acceleration in mechanics refers to the rate of change in a moving object's velocity with respect to time. accelerations as a vector quantity (in that they have magnitude and direction). An object's acceleration in relation to a force depends on the magnitude of the net force acting on it.

v = u + at

Inferring from the results, 0 = 8.5 Plus (-2.8)

t = -8.5/-2.8t t = 3.03s 3s

In light of the fact that v2 - u2 = 2 at this time, s = (v2 - u2)/2a s = (02 - (8.5)2)/2 (-2.8)

s = -72.25/-5.6\ss = 12.90 m ~ 13 m

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Answer:

Havent seen this one before but the explanation should help you out :)

Explanation:

There are only three atomic bonds.

Ionic bonding.

Covalent bonding.

Metallic bonding.

Heat naturally flows from an object that has a high temperature to an object that has a low temperature. Heat can be made to flow in the reverse direction if temperature  is done. A machine can never have an efficiency of fuel . This means that heat energy can never be fully converted into mechanical  energy.

What is temperature ?

The movement of these particles likewise increases with rising temperature. A thermometer or a calorimeter are used to measure temperature.

What is kinetic energy ?

When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and acquires kinetic energy.

Therefore,Heat naturally flows from an object that has a high temperature to an object that has a low temperature. Heat can be made to flow in the reverse direction if temperature  is done. A machine can never have an efficiency of fuel . This means that heat energy can never be fully converted into mechanical  energy.

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In Hubble's Law demonstrates that as the distance between a galaxy and us increases, the speed at which it appears to recede also increases. This observation supports the idea of an expanding universe, which is a key aspect of the current understanding of the cosmos.

Hubble's Law states that the more distant a galaxy is, the faster it appears to be receding from us. This observation is based on the redshift of light emitted by distant galaxies, which is the stretching of the wavelength of light towards the red end of the spectrum as the galaxy moves away from us. The relationship between the recessional velocity (how fast a galaxy is moving away) and its distance can be described by the equation:
Recessional velocity = Hubble constant × Distance
The Hubble constant (H0) is a value that represents the rate of expansion of the universe, measured in kilometers per second per megaparsec (km/s/Mpc).
In Hubble's Law demonstrates that as the distance between a galaxy and us increases, the speed at which it appears to recede also increases. This observation supports the idea of an expanding universe, which is a key aspect of the current understanding of the cosmos.

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Answer:

Explanation:

Discussion

The ones that are certain are

If you have a normal, and the player slides into 2nd, and stops (which he must before he is tagged), then there must be friction involved. There must be gravity, or he would keep going up.

I don't think there is tension. There might be some Air Resistance, but that force is very tiny. Don't be surprised if you answer includes Air Resistance, but I won't try it to begin with.

Density is a measure of how much mass is contained within a given volume.  An object with a density of 1000 kg/m³ is denser than an object with a density of 1 g/cm³.

Density is a measure of how much mass is contained within a given volume. The formula for density is mass divided by volume (ρ = m/V). In the metric system, density is commonly expressed in kilograms per cubic meter (kg/m³) or grams per cubic centimeter (g/cm³).

Comparing the given densities, we can see that 1 g/cm³ is equivalent to 1000 kg/m³ since there are 1000 grams in a kilogram and 1 cubic meter is equal to 1,000,000 cubic centimeters. Therefore, the object with a density of 1000 kg/m³ has a higher mass per unit volume compared to the object with a density of 1 g/cm³.

This means that for the same volume, the object with a density of 1000 kg/m³ contains more mass, making it denser than the object with a density of 1 g/cm³. In simpler terms, if you were to compare objects of the same size, the object with the higher density would feel heavier because it has more mass packed into the same amount of space.

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an arrow

Explanation:

momentum is a vector quantity it has both magnitude and direction.

a vector diagram can be used to represent this principle of momentum conservation such as diagram uses an arrow to represent the magnitude and direction of the momentum vector for the individual objects before the collision and combined after the collision

The best representation of momentum vector is ; ( 4 )  An arrow

A momentum is a vector quantity with both magnitude and direction and it  simply represents  a mass ( object ) in motion. momentum is calculated as ;

P = mV .  where m = mass of object , v = velocity of object .

An arrow is a good representation of momentum vector because it has both mass and velocity when fired from bow.

Hence we can conclude that the best representation of momentum vector is an arrow.

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The possible frequencies of the other tuning fork are 311 Hz and 289 Hz.

When two tuning forks are sounded together, they produce beats, which are periodic variations in sound intensity. The frequency of the beats is equal to the difference between the frequencies of the two tuning forks. In this case, the beat frequency is 11 beats per second.

To find the possible frequencies of the other tuning fork, we need to determine the frequency difference between the two tuning forks that can produce a beat frequency of 11 Hz. Since the given tuning fork has a frequency of 300 Hz, we can add or subtract the beat frequency from its frequency to find the other possible frequencies.

Adding 11 Hz to 300 Hz gives us 311 Hz, while subtracting 11 Hz from 300 Hz gives us 289 Hz. Therefore, the possible frequencies of the other tuning fork are 311 Hz and 289 Hz, depending on whether the beat frequency is produced by an increase or decrease in frequency.

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The possible frequencies of the other tuning fork are 311 Hz and 289 Hz.

When two tuning forks are sounded together, they produce beats, which are periodic variations in sound intensity. The frequency of the beats is equal to the difference between the frequencies of the two tuning forks. In this case, the beat frequency is 11 beats per second.

To find the possible frequencies of the other tuning fork, we need to determine the frequency difference between the two tuning forks that can produce a beat frequency of 11 Hz. Since the given tuning fork has a frequency of 300 Hz, we can add or subtract the beat frequency from its frequency to find the other possible frequencies.

Adding 11 Hz to 300 Hz gives us 311 Hz, while subtracting 11 Hz from 300 Hz gives us 289 Hz. Therefore, the possible frequencies of the other tuning fork are 311 Hz and 289 Hz, depending on whether the beat frequency is produced by an increase or decrease in frequency.

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First column (left side):

1 g

1600 mm

0.109 kg

0.250 km

14,000 m

1,000 mL

4.80 m

0.027 kg

Answer:

Two electrons receive treacherous and formidable power when met while the atoms in the ball move slowly around with great space.

Explanation:

hope this helped!

Answer:

mass

Explanation:

Density is the measure of how much mass of a substance is squeezed into a given volume of that substance. It is the mass per unit volume, and substances with lesser density will float in materials with denser density. Buildings are generally more obviously denser that air, if not we'll see then float upwards into the atmosphere, but that is not the case. Different liquids too can separate and form layers on one another due to their differences in volume.

In each trial the material and hence the index of refraction in the region between the barrier and the screen is 487.8 nm

Given D=2.05,d=5

m=1,Y1=20cm

we have d sinθ = mλ

λ=dYn/mD=

5*10⁻⁶*20*10⁻²/1*2.05

λ=487.8 nm

In physics, refraction is the direction change brought on by a wave's speed change as it passes through one medium and enters another. In deep water, for instance, waves move more quickly than in shallow water. When two materials with different densities, such as air and glass, are in contact, light waves change their speed. Refraction is the term for the resultant change in direction that results.

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Answer:

I think 100V but I'm not sure.

Answer:

Water is a compound because it is made up of water molecules. There is no such thing as water atoms. Water molecules are made of hydrogen and oxygen atoms, in the definite proportion of two hydrogens for one oxygen.

1. s = 0.29 s

2. m= 0.23m

3. k.E = 2.1J

i. d = ½ at2

t = (2d/a) = (2 A 0.40 m/9.8 m/s ) = 0.2857142857 s = ½ 2 ½

0.29 s

ii. d = vt = 0.8 m/s A 0.2857142857 s = 0.2285714286 m = 0.23 m

iii. KE = KE + PE

KEf

= ½ mv + mgh = 0.5 A 0.50 kg A (0.8 m/s) + 0.50 kg A 9.8 m/s A 0.40 m = 2.12 J =  2.1 J

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Answer:

Not not all of the elements have been discovered.

The displacement of the projectile during first 2 seconds is 5400 mm.

A body projected by external force and continuing in motion by its own inertia is called as projectile.

Motion of an object thrown into the air when, after initial force that launches the object, air resistance is negligible and only other force that object experiences is the force of gravity is known as projectile motion.

∫(0 to 2) v dt = ∫(0 to 2) 1800(1−e−0.3t) dt

= 1800 [t + (1/0.3)e^(-0.3t)] from 0 to 2

= 1800 [(2 + (1/0.3)e^(-0.6)) - (0 + (1/0.3)e⁰)]

= 1800 [2 + (1/0.3)e^(-0.6) - (1/0.3)]

= 1800 [2 + 3.333 - 3.333]

= 5400 mm

Therefore, displacement of the projectile during the first 2 seconds is 5400 mm.

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Answer:

C

Explanation:

Answer:

1st one

identity of the H₂O

When water (H2O) freezes into ice, some of the properties have changed but the identity of the H2O is the same. Explanation; Water can exist in liquid, solid; ice and gaseous state; steam. Freezing occurs when water is continuously cool until it turns to solid ice, water freezes at zero degree Celsius

Hope This Helps

Answer:

A. identity of h20

Explanation:

Answer:

Explanation:

he force will depend on the masses of the rocks.

The formula you weren’t paying attention to in your Physics lesson was one of the more basic ones:

F = ma

F is the force. m is the mass of the object, and a is the acceleration. That’s all you should need.

Unfortunately, your question gave the weight of the rocks, not their masses. So, it can’t be answered without more information - eg is the rock on Earth, or on the moon, Mars or a planet orbiting Alpha Centauri?

If the rock is located on Earth, then you can use the same formula as above, because we know that a = g = 9.8m/s/s. and F is the weight. So, we know F, a and can work out m using a bit of basic algebra.

The other problem is that we don’t know the mass of the second piece of rock, because we haven’t been told either the weight or mass of that piece of rock.

If your homework question didn’t specify that, you can either refuse to answer it saying that not enough information was given, or STATE in your answer that you are assuming that the second piece of rock is the same mass as the first one.

If you decide to do that, then a minute’s work should give you the answer you’re looking for.

Because of Kinetic Theory Postulate, the gas molecule's collision will affect.

Gases can be compressed because most of the volume of gas is an empty space according to Kinetic Molecular theory. If we compress a gas without changing its temperature, the average K.E of the gas particles remains the same. There is no change in the speed of the gas molecules with which the particles move in a container, but the container is smaller. So particles travel from one side of the container to the other in a very small period of time. So it means that they strike the walls mostly. Any increase in the frequency of collisions with the walls must increase the pressure of the gas. from Boyle's law, the pressure of gas becomes more significant as the volume of the gas becomes smaller have opposite relation.

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Answer:

1)  Theories are constructed after there is numerous data collected during the experiment.

2) I think it’s many scientists all over the world accept it as true.

3) to explain natural and physical phenomena

Explanation:

The altitude of 4.3 kilometers corresponds to approximately 56.5% of the surface atmospheric pressure.

Atmospheric pressure decreases as altitude increases due to the decrease in air density. This decrease follows an exponential relationship with altitude. To calculate the percentage of surface atmospheric pressure at a given altitude, we need to compare the atmospheric pressure at that altitude with the pressure at sea level.

At sea level, the average atmospheric pressure is approximately 101.3 kilopascals (kPa). As we ascend to higher altitudes, the pressure decreases. A commonly used model to estimate this relationship is the barometric formula. According to this model, the pressure decreases by about 12.2% per kilometer of altitude.

Using this information, we can calculate the atmospheric pressure at 4.3 kilometers by multiplying the sea-level pressure by the relative decrease factor. Since the pressure decreases exponentially, the percentage of surface atmospheric pressure at 4.3 kilometers is given by:

\(\[ \text{{Percentage of surface atmospheric pressure}} = 100\% \times e^{-0.0122 \times 4.3} \approx 56.5\% \]\)

Therefore, an altitude of 4.3 kilometers corresponds to approximately 56.5% of the surface atmospheric pressure.

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Answer:

9600

Explanation:

Answer:

Hey... your answer is 9,600

Explanation:

Hope this helps :)

Here is prove just in case...

Best of luck <3

Answer:

Explanation:

The total distance covered by the car will be the sum total of the distance moved during the journey.

Distance moved towards east = 5 km

Distance moved towards west = 48km

Total distance covered = Distance moved towards east+Distance moved towards east

Total distance covered  = 5km+48km

Total distance covered  = 53km

Hence the total distance a car would travel if it moves 5 km East and then turns and travels 48 km West is 53km