If viewed at the correct time and in the right conditions, asteroids, comets, and meteors are all visible to the nked eye.

true or false

Answer:

The momentum will quadruple

Explanation:

Original momentum

momen = mv

now increase both

 momen = 2m * 2v = 4 mv  <====== the momentum has quadrupled

The magnitude of the electric field inside the conductor will be 0.208 N/C.

An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.

Given data;

length of rod = 25 cm = 0.25 m

Potential Difference = 52 mV = 0.052 Volts

The electric field is found as the ratio of the potential difference and the length;

[tex]\rm E =\frac{0.052}{0.25} \\\\ E=0.208 \ N/C[/tex]

Hence,the magnitude of the electric field inside the conductor will be 0.208 N/C.

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The characteristic of waves that remains unchanged when it enters a distinct medium is the frequency (Option B).

The expression 'wave frequency' indicates the period of time or occurrence of a particular type of wave.

In conclusion, the characteristic of waves that remains unchanged when it enters a distinct medium is the frequency (Option B).

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Answer: B. frequency

Explanation: plato answer :)

Net force

As it's negative the box will move left

(a) The mass of the car is 1,795.92 kg

(b) The initial momentum of the car is 44,897.96 kgm/s.

(c) the change in momentum for the car is 44,897.96 kgm/s..

(d) The time it takes the braking force to bring the car to rest is 69.4 s.

The mass of the car is calculated as follows;

W = mg

m = W/g

m = (17,600)/9.8

m = 1,795.92 kg

Pi = mvi

Pi = 1,795.92 x 25

Pi = 44,897.96 kgm/s

ΔP = Pf - Pi

ΔP = 0(1,795.92) - 44,897.96 kgm/s

ΔP =  - 44,897.96 kgm/s

F = ma

-650 = 1,795.92(a)

a = -650/1,795.92

a = -0.36 m/s²

v = u + at

0 = 25 - 0.36t

0.36t = 25

t = 69.4 s

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Answer: Acceleration =3m/s^2

Explanation:

Answer: True

Explanation:

A scalar quantity is those quantities that only have magnitude and no direction. Therefore the value doesn't change with direction.

Answer:

Approximately [tex]21.6\; {\rm m\cdot s^{-1}}[/tex], assuming that the coefficient of kinetic friction between the tires and the ground stays the same.

Explanation:

Let [tex]\mu_{k}[/tex] denote the coefficient of kinetic friction between the tires and the ground.

Let [tex]m[/tex] denote the mass of the truck. Let [tex]g[/tex] denote the gravitational field strength. The weight of this truck would be [tex]m\, g[/tex]. Since the curve is flat, the magnitude of the normal force [tex]F_\text{normal}[/tex] between the truck and the ground would also be [tex]m\, g\![/tex].

Let [tex]v = 32.5\; {\rm m\cdot s^{-1}}[/tex] denote the speed at which the truck goes around the curve with a radius of [tex]150\; {\rm m}[/tex]. The (horizontal) centripetal acceleration of the truck would be:

[tex]\displaystyle a = \frac{v^{2}}{r}[/tex].

The horizontal net force on the truck (of mass [tex]m[/tex]) would need to be exactly:

[tex]\displaystyle F_\text{net} = m\, a = \frac{m\, v^{2}}{r}[/tex].

The friction between the tires of the truck and the ground is the only horizontal force on the truck. Thus, this friction would need to supply the entirety of this horizontal net force:

[tex]\displaystyle F_\text{friction} = F_\text{net} = \frac{m\, v^{2}}{r}[/tex].

Notice that increasing [tex]v[/tex] would require an increase in the kinetic friction between the truck, [tex]F_\text{friction}[/tex]. However, since [tex]F_\text{friction}\![/tex] is at most [tex]\mu_{k}\, F_\text{normal}[/tex] (which is equal to [tex]\mu_{k}\, m\, g[/tex]):

[tex]\begin{aligned}\frac{m\, v^{2}}{r} &= F_\text{friction} \\ & \le \mu_{k}\, F_\text{normal} \\ &= \mu_{k}\, m\, g\end{aligned}[/tex].

Therefore, when the radius of the curve is [tex]r^{\prime}[/tex], the maximum velocity of this truck would be:

[tex]\begin{aligned}v^{\prime} &= \sqrt{\mu_{k}\, g\, r^{\prime}}\end{aligned}[/tex].

Likewise, it is possible to express [tex]\mu_{k}[/tex] in terms of [tex]r[/tex], [tex]g[/tex], and max speed [tex]v[/tex]:

[tex]\displaystyle \mu_{k} = \frac{v^{2}}{r\, g}[/tex].

Substitute this expression for [tex]\mu_{k}[/tex] back into the expression for [tex]v^{\prime}[/tex]:

[tex]\begin{aligned}v^{\prime} &= \sqrt{\mu_{k}\, g\, r^{\prime}} \\ &= \sqrt{\frac{v^{2}}{r\, g}\, g\, r^{\prime}} \\ &= \sqrt{v^{2}\, \frac{r^{\prime}}{r}}\end{aligned}[/tex].

Given that [tex]v = 32.5\; {\rm m\cdot s^{-1}}[/tex], [tex]r = 150\; {\rm m}[/tex], and [tex]r^{\prime} = 66.0\; {\rm m}[/tex]:

[tex]\begin{aligned}v^{\prime} &= \sqrt{v^{2}\, \frac{r^{\prime}}{r}} \\ &= \sqrt{(32.5\; {\rm m\cdot s^{-1}})^{2} \times \frac{66.0\; {\rm m}}{150\; {\rm m}}} \\ &\approx 21.6\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].

Answer:

5730 yr

Explanation:

25  = 100 (1/2)^11460/x       where x = half life

.25 = (1/2)^11460/x

log .25 / log.5   = 11460/x

x = 5730 yr

One can calculate speed from the given data. The speed is 4.44m/s.

The speed is the ratio of distance and the time taken to cover that distance.

Given is the distance d =4km =4000m and the time taken t 15 min =15 x60 =900 s

Then the speed will be

s = d/t

s = 4000/900

s= 4.44 m/s

Thus, the speed is calculated as 4.44m/s.

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Answer:

The object obeys the equation

F = M a     on both the earth and the moon (mass does not depend on location)

The problem is a little misleading because if an object has a mass of

10 kg then its weight is 10 kg * 9.8 m/s^2 = 98 Newtons

That means that weight is not expressed in Kg but rather in Newtons

Newton's Law is true on the moon as it is on the earth and F = M a

An object that weighed 10 N on earth would weigh 10 / 6 = 1.67 N on the moon

One must take care in describing a force in units of Newtons not in Kg

The simplest compound of hydrocarbon is methane

The electron structure attached

a is the correct answer

Explanation:

no.of proton defines atomic number in an atom

Answer: a

Explanation:

An atomic number is the number of protons found in the nucleus. The number of protons is equal to the number of electrons. The atomic mass the atomic number add the amount of neutrons.

Answer:

100m/s

Explanation:

speed of wave=frequency × wave length

=10 × 10

=100m/s

Answer:

100 m/s

Explanation:

Formula :

Solving using the given values :

Answer:

Continental polar.

Explanation:

it should be a continental polar air mass because, it is cold.

Answer:

No, there are multiple ways in which different mutations in the same gene can cause the same phenotype

Explanation:

Several different mechanisms of mutation can lead to the same phenotype. For example, lets say our phenotype is that flies have white eyes, and we know that this occurs in one particular gene that normally makes the eye colour red. (the red gene)

These mutations likely rendered the red gene ineffective (as the eyes are not red). However, this could happen in a variety of ways.

There could be a single base deletion in the first exon of the mRNA, changing the reading frame of the protein and messing up the entire sequence (a frame shift mutations)

The entire gene could be deleted

A single base could be substituted in an important site of the gene, for example, one which translates into a catalytic residue or binding site in the protein

There could be an inversion at the promoter region of the gene, such that a transcription factor can no longer bind to transcribe the gene.

There are countless other ways in which a mutation could have been caused. Therefore, just because we know the same gene is affected does not mean that we can assume the mutations are identical.

Charging by rubbing needs physical contact, and charging by sharing does not need any contact.

When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. Similar charges repel each other, whereas dissimilar charges attract each other.

An electrical charge is created when two distinct insulating materials are rubbed together.

Charge sharing is a signal degradation phenomenon that occurs when charges are transferred from one electronic domain to another.

Electrostatics is the phenomenon of charging by rubbing, whereas induction is the phenomenon of charging by sharing.

Hence, charging by rubbing needs physical contact, and charging by sharing does not need any contact.

​

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Answer:

By ADDING the forces

Explanation:

All the following are momentum oscillators except Advance/Decline Line.

Momentum oscillators measure the amount that a security's price has changed over a given period of time.

Thus, all the following are momentum oscillators except Advance/Decline Line.

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Answer:

Earth rotates eastward, in prograde motion. As viewed from the north pole star Polaris, Earth turns counterclockwise.

The time it takes Earth to rotate so the sun appears in the same position in the sky, known as a solar day, is 24 hours. However, the time it takes Earth to complete one full rotation on its axis with respect to distant stars is actually 23 hours 56 minutes 4.091 seconds, known as a sidereal day.

Earth's axis is an imaginary pole going right through the center of Earth from "top" to "bottom." Earth spins around this pole, making one complete turn each day. That is why we have day and night, and why every part of Earth's surface gets some of each. Earth has seasons because its axis doesn't stand up straight.

Earth and sun are part of the solar system, with the sun at its centre. An Earth day is 24 hours because the Earth spins on its axis once every 24 hours. At any one time half of the Earth's sphere is in sunlight (day) while the other half is in darkness (night).

The Earth's axis runs from the North Pole to the South Pole. It takes the Earth 24 hours, or one day, to make one complete rotation around this invisible line. As the Earth rotates, each area of its surface gets a turn to face and be warmed by the sun. This is important to all life on Earth

The acceleration of the truck is 45.5 m/s² and the velocity of the truck is 27.8 m/s.

The acceleration of the truck is calculated as follows;

F = ma

a = F/m

a = (2.685 x 10⁵)/(5900)

a = 45.5 m/s²

a = v²/r

v² = ar

v² = 45.5 x 17

v² = 773.64

v = 27.8 m/s

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The evidence that supports continental drift and plate tectonics includes different fossils, the same rocks and the shapes of continents that fit together.

Continental drift is a theory that states continents once were part of one big landmass known as Pangea.

Nowadays, the theory of continental drift proposed by Alfred Wegener has been replaced by plate tectonics.

In conclusion, the evidence that supports continental drift and plate tectonics includes fossils, the same rocks and the shapes of continents that fit together.

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Answer:

V = f λ     speed of wave in terms of frequency and wavelength

t = S / V      time for wave to travel a distance S

t = 91.4 m / 344.5 m/s = .265 sec        time to travel 91.4 m

Answer:

an instrument for measuring the density of liquids.

Explanation:

Plasma osmolarity increases when you give a severely dehydrated person large amounts of pure water.

The electrolyte–water balance of the body is measured by plasma osmolality. This amount can be determined in a variety of ways, including measurement and computation.

Osmolality and osmolarity are two separate measurements that are used interchangeably in everyday situations.

When you are dehydrated, osmolality rises, and when you have too much fluid in your blood, it drops.

The way your body regulates osmolality is unique. When your body's osmolality rises, your body produces antidiuretic hormone.

Hence,plasma osmolarity increases when you give a severely dehydrated person large amounts of pure water.

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Answer:

You would need to be 33 feet deep.

Explanation:

Answer:

A) position B

As the earth rotates about its axis (shown tilted), the northern half will receive more sunlight than the southern half which is in winter

Let's find the shortest distance possible

To calculate we need the length per division divide total length by divisions

Till 1 mm it can measure

To increase accuracy increase no of divisons