Select the correct answer.
Why does ice float on water?
A.
The temperature of ice is lower than the temperature of water.
B.
The temperature of water and ice are the same.
C.
The density of ice is less than the density of water.
D.
The density of ice is greater than the density of water.

Answer:

Explanation:

Heat gained by ice in warming up to 0⁰C = .035 x 2090 x (83-0)= 6071.45 J

heat used up by ice to melt at 0⁰C = .035 x 3.33 x 10⁵ J = 11655 J

Heat used up in warming up water to t⁰C = .035 x 4186 x t = 146.51 t

heat released by warm water to cool from 22⁰C to t = .565 x 4186 x ( 22 - t )

=52032 -2365.1 t

heat released by copper calorimeter  to cool from 22⁰C to t =  .087 x 387 x ( 22 - t ) = 740.72 - 33.7 t

total heat released = 52032 -2365.1 t  + 740.72 - 33.7 t

= 52772.72 - 2398.8 t

Heat lost = heat gained

52772.72 J- 2398.8 t  = 6071.45 J + 11655 J + 146.51 t

2545.31 t = 35046.27

t = 13.8°C.

The size of the free block just before it was partitioned by x is 2M+5M=7M. If x is a large block, the size of the free block will be smaller than if x is a small block.

An operating system has a "free space list" that keeps track of the available blocks. When a file is generated, the operating system looks through the list of available free space for the needed space to save a file. The file system releases the specified space when a file is deleted and adds it to the "free space list." Free space is crucial because when a file system fills up, file access efficiency decreases. UFS file systems function well as long as there is sufficient free space. Only root has access to the reserved free space when a file system is full, consuming up all of the available user space.

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Answer:

5.6*10^23. if 10^n is greater, that means its the larger value. hope dis helps

Explanation:

Answer:

Plan B.

Because flexibility is best improved by stretching.

Explanation:

Improving and increasing flexibility is done by having stretching sessions daily which maintains and widens the range of motion in the joints and stretches muscles.

Answer:

por ver cp

Explanation:

sisisi cp osea caldo de pollo

Explanation:

1) reduction in current

2)less no. of coils per unit length

3) removal of soft iron core

The beam used is a negatively charged electron beam with a velocity of

v = E / B where E is the electric field and B is a magnetic field.

Now indicates that the electric field and the magnetic field are contracted and that the beam passes without deviating, so the electric and magnetic forces must be balanced

        Fe = Fm

        q * E = q * v * B

        v = E / B

this configuration is called speed selector.

The beam used is a negatively charged electron beam with a velocity of v = E / B.

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Although part of the question is missing the complete question is A depiction of a famous scientific experiment is given. Consider how the beam changes when the magnet is off compared to when the magnet is on. A bell-shaped evacuated glass tube with a narrow end and a wide end is connected to a battery at the narrow end. In the center of the tube there is a negatively charged plate above the tube, a positively charged plate below the tube, and a magnet with the field turned off. A beam originating at the narrow end of the tube travels toward the wide end of the tube. With the magnetic field turned off, the beam path bends toward the positively charged plate and ends at the lower half of the wide end of the tube. A bell-shaped evacuated glass tube with a narrow end and a wide end is connected to a battery at the narrow end. In the center of the tube there is a negatively charged plate above the tube, a positively charged plate below the tube, and a magnet with the field turned n. A beam originating at the narrow end of the tube travels toward the wide end of the tube. With the magnetic field turned on, the beam path travels in a straight path to the center of the wide end of the tube. What type of beam was used in this experiment?

The free-fall acceleration of an object at a height of 3190 km away from the earth surface is 4.35 m / s²

g' = g [ R² / ( R + h )² ]

g' = Acceleration due to gravity at a height from the surface

g = Acceleration due to gravity

R = Radius of Earth

h = Height from the surface

g = 9.8 m / s²

h = 3190 km = 3190 * 10³ m

R = 6371 km = 6371 * 10³ m

g' = 9.8 [ ( 6371 * 10³ )² / ( 6371 * 10³ + 3190 * 10³ )² ]

g' = 9.8 [ 40589641 * \(10^{6}\) / 91412721 * \(10^{6}\) ]

g' = 9.8 * 0.44

g' = 4.35 m / s²

The free fall acceleration of an object is due to the gravitational pull of the object. If the object is closer to the surface of the Earth its free fall acceleration will be 9.8 m / s². The farther they go, lesser will be the free fall acceleration.

Therefore, the free-fall acceleration of the object is 4.35 m / s²

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The combination of these observational pieces of evidence allows astronomers to distinguish halo stars from disk stars and understand the different populations of stars in our galaxy.

Halo stars are distinguished from disk stars by their different kinematic properties. They have highly elliptical orbits that take them far above and below the plane of the galaxy. Halo stars also have a different chemical composition compared to disk stars. They have lower metallicity, which means they have fewer elements heavier than hydrogen and helium. This difference in chemical composition suggests that they formed earlier in the history of the Milky Way, when there were fewer heavy elements in the interstellar medium. Additionally, halo stars tend to be older and have a different spatial distribution than disk stars.

Overall, the combination of these observational pieces of evidence allows astronomers to distinguish halo stars from disk stars and understand the different populations of stars in our galaxy.

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The gazelle has zero average acceleration because it's moving at a constant speed. Constant speed means no change in speed means zero acceleration.

The cheetah, on the other hand, changes its speed from 0 m/min to 1820 m/min in a matter of 3 seconds, so its average acceleration is

a[ave] = (1820 m/min - 0 m/min) / (3 s)

… = (1820 m/min) / (3/60 min)

… = 36,400 m/min²

… = (36,400 m) / (60 s)²

… = 91/9 m/s² ≈ 10.1 m/s²

The potential energy of two point charges when they are twice as far apart will be 1/4U.

The potential energy between two point charges depends on the distance between them. The relationship between potential energy (U) and distance (d) is given by the equation:

U ∝ 1/d

This means that as the distance between the charges increases, the potential energy decreases.

In the given scenario, if the charges are initially a distance d apart and the potential energy is U, and then they are moved to a distance 2d apart, we can determine the new potential energy.

Since the potential energy is inversely proportional to the distance, doubling the distance will result in a quarter (1/4) of the initial potential energy. Therefore, the potential energy when the charges are twice as far apart is U/4.

Hence, the correct option is U/4.

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the complete question is:

If the electrical potential energy of two point charges is U when they are a distance d apart, their potential energy when they are twice as far apart will be U/4. U/2. U 2U. 4U

The kinetic energy of another body having three times the mass of the given object will be 108 J

Kinetic energy-In physics, the kinetic energy of an object is the energy  it has due to  motion. It is defined as the work required to accelerate a body from a given mass from rest to a specified speed.

The kinetic energy of a body is given by \(K.E= \frac{1}{2}Mv^{2}\) (first equation)

Given K.E= 36J

Now the mass of second body is m=3M

also the second body is moving with the same speed v

So kinetic energy of second body K.E₂= \(\frac{1}{2}mv^{2} =\frac{1}{2}(3M)v^{2}\)=36×3

=108J (from first equation)

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The total charge to conserved that is Q=-6C,Now the sum of the total charges on both the pieces should be Q=Q1+Q2 = -6C,given that one charge is Q1 =2C,  there fore -6 =2+Q2, There fore the charge on other piece is Q2 = -6-2 = -8C.

In accordance with the principle of charge quantization, the total charge on an object must be an integer multiple of the basic charge, which is the fee on an electron (e).Not an integer, this.Thus, a body charged at 2.810-18 C is not possible.

If there are greater proton than electrons, the charge density of the thing is positive.If an object has more electrons than protons, it has a negative net charge.If there are an equal number of protons and electrons, the thing is neutral.

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With the aid of your spectroscope and E = (h*c)/wavelength, you can determine the energy of the emitted light to be 3.97 x 10-19.

mathematical representation The movement v (in the x direction), frequency f, and wavelength of traveling sinusoidal waves are frequently expressed mathematically as follows: where y is the value of the wave at any place x and time t, and A is the wave's amplitude.

The symbol for the wavelength in the SI is typically m, or one metre. The multiples or fractions of something like a meter are also employed for measuring wavelength. Notably, when wavelengths are a significant attribute, exponential powers of 10 are employed. Shorter wavelengths are given as negative exponentials.

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The model house on remote renewable energy will generate (20mmm + 30sss) kilowatt-hours of energy in 10 years.

Given:

Remote Renewable House= 2 windmills + 3 turbines

1 windmill generate mmm kilowatts-hours in a year

Therefore,

2 windmills will generate,

2×mmm=2mmm kwh in a year

In 10 years, 2 windmills will generate

10×2mmm=20mmm

1 solar panel generate sss kilowatt-hour each in 1 year

3 solar panels will generate yearly

3×sss=3sss

In 10 years, 3 solar panels will generate

10×3sss=30sss

Therefore, the total energy generated in the renewable model house is in 10 years

(20mmm+30sss)  kwhr

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Answer:

B. man with a beard

Explanation:

it is not a genetic mutation because it is completely natural and common unlike the other options.

Answer:

D=M/V

Explanation:

TOOK THT ETST

Answer:

64 m

Explanation:

use formula velocity= displacement / time

\(\\ \rm\longmapsto Distance=Speed\times Time\)

\(\\ \rm\longmapsto Distance=8(8)\)

\(\\ \rm\longmapsto Distance=64m\)

Answer:

C- 96 m

Explanation:

d= st

d= 8 m/s x 12 seconds

d= 96 metres

Answer:

I think its true? do your research to be 100% sure

Explanation:

Answer: true

Explanation:

Density, mass of a unit volume of a material substance

Answer:

\(2\sqrt{6}\)  \(\frac{mi}{s}\)

Explanation:

Assuming there is no waste of energy:

\(K_{1} = K_{2}\\\frac{1}{2}m_{1}v_{1_{1}}^{2} + \frac{1}{2}m_{2}v_{2_{1}}^2 = \frac{1}{2}m_{1}v_{1_{2}}^{2} + \frac{1}{2}m_{2}v_{2_{2}}^2\\\\=> m_{1}v_{1_{1}}^{2} + m_{2}v_{2_{1}}^2 = m_{1}v_{1_{2}}^{2} + m_{2}v_{2_{2}}^2\\\\m_{1} = 2 kg, m_{2} = 1 kg, v_{1_{1}} = 4 \frac{mi}{s} , v_{2_{1}} = 0\\=> 32 = 8 + v_{2_{2}}^{2} => v_{2_{2}} = 2\sqrt{6} \frac{mi}{s}\)

Answer:12.43 m/s

Explanation:

Answer:

Gravity of a particular planet depends on the mass of the planet and the radius of the planet.

Explanation:

Answer:

IT DEPENDS PARTICULARLY ON THE MASS OF AN OBJECT

A device that produces a magnetic field by wrapping wire into a coil is an electromagnet. It is a magnet in which the magnetic field is generated by an electric current.

An electromagnet is a type of magnet in which a magnetic field is generated by an electric current. Electromagnets are usually made of wire wound into a coil. The current flowing through the wire creates a magnetic field which is concentrated in a hole in the center of the coil. When the current is switched off, the magnetic field disappears. Wire coils are usually wrapped around a core made of a ferromagnetic or ferrimagnetic material such as iron; the core concentrates the magnetic flux and is a stronger magnet. The biggest advantage of electromagnets over permanent magnets is that the magnetic field can be changed quickly by controlling the amount of current in the windings. Unlike permanent magnets, which do not require a power source, electromagnets require a constant supply of electric current to maintain a magnetic field.

Electromagnets are widely used as components of other electrical equipment such as electric motors, generators, electromechanical solenoids, relays, speakers, hard drives, MRI machines, scientific instruments, and magnetic separation equipment . Electromagnets are also used in industry to lift and move heavy ferrous objects such as scrap metal and steel.

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the color you see is The color reflected by the object. Hence option C is correct.

The visual sense of colour or colour is dependent on the electromagnetic spectrum. Colour perception is connected to an object's light absorption, reflection, emission spectra, and interference, even though colour is not an inherent characteristic of matter.

When two distinct media come together at an interface, a wavefront might reverse direction so that it returns to the first medium, which is known as reflection. The reflection of light, sound, and water waves are typical examples.

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We will observe that the people who are inside the spaceship are aging less faster than we do.

If the spaceship travelling as fast as the light and we are able to notice inside the spaceship, we will observe that the it for a long period of time inside the spaceship will be flowing at a slower rate as compared to us.

This phenomena is called time dilation.

For the observed, the faster the object travels, the slower the time will be for them. As a result, the passengers within the spaceship appear to experience time more slowly than someone watching from outside.

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11.The time at 75° East longitude would be 1 hour and 20 minutes behind. 12.The time at 135° degrees East longitude would be 4 hours ahead. and 13. the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM.

At 2:00 AM at 90° East longitude, the time at 75° East longitude would be 1 hour and 20 minutes behind. This is because for every 15 degrees of longitude, there is a time difference of approximately 1 hour. Since the two longitudes in question have a difference of 15 degrees, we can divide this by 15 to calculate the time difference.

If it is 8:00 PM at 15° East longitude, the time at 135° East longitude would be 4 hours ahead. Similarly, for every 15 degrees of longitude, there is an approximate time difference of 1 hour. Since the two longitudes in question have a difference of 120 degrees, we can divide this by 15 to calculate the time difference.

There is a 7-hour difference** between 105° West longitude and the Prime Meridian (0° longitude). The Prime Meridian, passing through Greenwich, England, serves as the reference point for determining time zones. As one moves westward from the Prime Meridian, each 15 degrees of longitude corresponds to a time difference of approximately 1 hour. Therefore, the time at 105° West longitude would be 7 hours behind the time at the Prime Meridian.

If it is 9:30 AM in New York (41° North latitude, 75° West longitude), the time in Lima, Peru (15° South latitude, 75° West longitude) would also be 9:30 AM. The latitude does not affect the time difference between the two locations. However, since both locations have the same longitude (75° West), they would experience the same local time. The time difference between different latitudes is primarily significant for determining time zones rather than the actual time within a specific time zone.

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