Daily Task $18.3: Homework/Classwork 1. 1.1 The speed of sound in air is about 330 m-s'. A lightning bolt strikes a tree that is 1,5 km away from you. Calculate the time from the moment that you see the lightning flash until you hear the thunder that accompanies it. ​

Answer:

Your answer would be:
B.) False


If a car drives on a road for a nonzero amount of time, then its average velocity must be nonzero.

If a car drives for a nonzero amount of time, then its average acceleration must be nonzero.

Explanation:

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Answer:

Momentum must be conserved in the collision.

The steel block must move faster after the collision to preserve momentum.

If the steel block is moving faster it will aso have more kinetic energy.

(Note; If the bullet hits the steel block it will have some momentum in the reverse direction and thus have a greater change in total momtntum than the bullet that becomes imbedded in the wood block)

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[tex]Introducing \: \: a \: dielectric \: \: into \: \\ a \: \: capacitor \: \: decreases \: \: \\ the \: \: electric \: \: field, \: \: \\ which \: \: decreases \: \: the \: \: \\ voltage, \: \: \ which \: \: increases \: \: the \: \: \\ capacitance. \: \: A \: capacitor \: \: with \: a \: \\ dielectric  \: \: stores \: the \: \\ same \: \: \ charge \: \: as \: one \: \\ without \: \: a \: dielectric, \: but \: at \: \\ a \: \: lower \: \: voltage. \: \: \\ Therefore \: \: a \: \: capacitor \: \: with \: \: a \: \\ dielectric \: \: in \: \: it \: \\ is \: \: more \: \: effective \: [/tex]

[tex]\mathbb \blue{ I \: hope \: it's \: helpful \: \: for \: you }[/tex]

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Answer:

Option B

Explanation:

Option B

Answer is PHOTOELECTRIC EFFECT

Answer:

11. true

12.

13. an upside down tree

14. copd

The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth with Moon, Mars, Jupiter, Saturn. Fixed stars are around the outside of the orbit of Saturn.

Explanation:

Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center. So I had to choose the choice that was most similar to that.

Let's see

According to law of conservation of linear momentum

Answer:

0.35 J

Explanation:

This problem requires the Law of Conservation of Energy.

⇒ Potential energy = Kinetic Energy

⇒ mgh = 1/2mv²

⇒ 0.5 x 10 x 0.07 = KE

⇒ KE = 5 x 0.07

⇒ KE = 0.35 J

Answer:

A V = A X / t         where X / t    is speed of fluid

A V = area * velocity (rate of fluid flowing)

A1 V1 = A2 V2        form of equation of continuity

pi (D1 / 2)^2 V1 = pi (D2 / 2)^2 V2

V2 = (D1 / D2)^2 * V1 = (8 / 5)^2 * 1.28 m/s = 3.28 km/s

The image here is not found here but star formation is characterized by clouds of dust where stars are born.

Star formation is a physical phenomenon where molecular clouds in space need to collapse to generate stars.

Stellar evolution is a process that initiates when a star is formed and ends when it dies (formation of a red giant).

Stars can be generated inside clouds of dust which are dispersed in different types of galaxies in the universe.

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[tex] \bf\sf \underline{Given: - }[/tex]

[tex] \bf\sf \underline{To \: Find: - }[/tex]

[tex] \bf\sf \underline{Solution: - }[/tex]

We know that, to find the Kinetic energy we are required mass and velocity and Here Both parameters are provided But mass is in gram so we need change it into kg,

1g = 0.001kg,

⠀⠀⠀50g = 0.05g

Now we know the formula of Kinetic energy,

[tex] \sf \boxed{ \star\bf{\: Kinetic \: energy = \frac{1}{2} m {v}^{2}}} \\ \\ \qquad \qquad = \frac{1}{ \cancel2} \times 0.05 \times \cancel{20}\times 20 \\ \\ \qquad \qquad =0.05 \times 200 \\ \\ \qquad \qquad \sf = 10J \: [/tex]

Hence, the kinetic energy of the pebble is 10J.

Answer:

hey

Explanation:

Displacement covered by the man calculated by using Pythagoras theorem is 10 km.

Pythagoras theorem states that, for a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the altitude and base sides.

Here,

The Pythagoras Theorem can be written as,

c² = b² + a²

where c is the hypotenuse, b is the base and a is the altitude of the triangle.

An example of application of the Pythagoras theorem is,

A man started walking from his home and covered a distance of 8 km towards the east and then turned right and walked a distance of 6 km towards the south, what is his displacement now from his starting point ?

A line drawn from his current position and his initial point represents the displacement covered by the man.

Let the starting point be A, then he walks to the point B and then he turns right and walks upto the point C.

Drawing a figure including all the data, we get a right angled triangle, ABC. So,

The base of the triangle, BC = 6 km

Altitude of the triangle, AB = 8 km

The displacement of the man = hypotenuse of the triangle

d = AC

According to Pythagoras Theorem,

AC² = BC² + AB²

AC² = 6² + 8² = 100

AC = √100

Therefore, displacement, d = AC = 10 km.

Hence,

Displacement covered by the man calculated by using Pythagoras theorem is 10 km.

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Attaching the image file here.

Answer:

F

Explanation:

Reducing access will cause less damage to occur

Answer: the answer is false

Answer:

See below    ( was it REALLY 1/4 INCH??)

Explanation:

Calculate the volume of the sphere

v = 4/3 pi r^3

 this times the density of the oil will give g displacement

   then f = ma

4/3 pi (.25 in  * 2.54 cm/inch) ^3  * .961 = 1.0307 gm

1.0307 gm   is   .0010307 kg

f = ma = .0010307 * 9.8 = .0101 N

Answer:

Since 1997: A second is a time equal to 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.

This definition refers to a caesium atom at rest at a temperature of 0 K

Explanation:

The approximate speed of the sound wave traveling through the solid material is 1012m/s.

Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.

From the wavelength, frequency and speed relation,

λ = v ÷ f

Where λ is wavelength, v is velocity/speed and f is frequency.

Given the data in the question;

To determine the approximate speed of the wave, we substitute our given values into the expression above.

λ = v ÷ f

2.3m = v ÷ 440s⁻¹

v = 2.3m × 440s⁻¹

v = 1012ms⁻¹

v = 1012m/s

Therefore, the approximate speed of the sound wave traveling through the solid material is 1012m/s.

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The given reaction, HCl + NaOH --- NaCl + H₂O is an example of an exothermic reaction. Hence, option A is correct.

In a reaction, the energy released in the form of heat is called an exothermic reaction. In an exothermic reaction, the heat energy is transferred to the surroundings. The chemical equation is Reactant = Product + Energy.

The energy absorbed from the surroundings is called an endothermic reaction. The heat energy taken from the reactants to form a product is called an endothermic reaction. It is described by the chemical equation as Reactant + Energy = Product.

From the given reaction,

HCl + NaOH --- NaCl + H₂O

HCl and NaOH is reactant and NaCl and water is a product. When strong acid (HCl) is mixed with a strong base (NaOH), it gives sodium chloride(NaCl) and water along with heat energy.

When the product is formed from the reactant, heat energy is released. This reaction is also called a Neutralisation reaction. The neutralization reaction are exothermic reaction, that forms chemical bonds by the release of energy.

When water is formed as a product by the release of greater energy than the energy absorbed is called a Neutralization/ exothermic reaction. Hence, the correct option is A) It is exothermic.

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Answer:

No

Explanation:

If a positively charged object is brought near a negatively charged electroscope, it will attract some of the excess electrons up the stem and out of the leaves, causing the leaves to come slightly together

Answer:

Explanation:

We know the relation :

We are given that :

Hence, on substituting the values in the equation :

The given information is,

→ Mass = 2 kg

→ Acceleration= 8.3 m/s

→ Force = F (in Newton)

Now we have to find the,

→ Amount of force applied to the object.

Formula we use,

→ F = Mass × Acceleration

Then the amount of force will be,

→ F = Mass × Acceleration

→ F = 2 × 8.3

→ [ F = 16.6 N ]

Hence, the amount of force is 16.6 N.

Answer:

Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.

Explanation:

The statement which best explains the speed of sound in different states of matter is that sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.

In ice, the atoms are present close to each other. It facilitates the transfer of sound waves in the ice medium. The closer the atoms are to each other, the higher the pitch, and vice versa.

As in ice, the high-frequency sound waves propagate faster; hence that high tone right at the start rapidly drops in pitch. The high-frequency vibration hits your ear first, with the low-frequency tone right on its heels.

In ice, the interaction of sound with the ice affects transmission loss. While in steam the atoms are far apart due to which the waves do not propagate successfully.

Therefore, sound travels fastest in ice because energy is easier to transfer when the molecules are close together. Thus, the correct option for this question is A.

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Answer:

Just beneath the photosphere, and extending inward to about 0.7 Rsun, is the convection zone. Energy generated in the core of the Sun moves outward through this layer by a boiling motion in which hot plasma rises, releases some of its energy, cools, and then sinks again.

Explanation:

The magnetic field strength is 9.47 ×10⁻⁴ T

The energy density at the center of the loop is 0.36 J/m³

From the question, we are to find the magnetic field strength

The magnetic field strength of a loop can be calculated by using the formula,

[tex]B = \frac{\mu_{0} I}{2R}[/tex]

Where  B is the magnetic field strength

[tex]\mu_{0}[/tex] is the permeability of free space [tex](\mu_{0}=4\pi \times 10^{-7} \ N/A^{2})[/tex]

[tex]I[/tex] is the current

and R is the radius

From the give information,

[tex]R = 75 \ mm= 75 \times 10^{-3} \ m[/tex]

and [tex]I = 113 \ A[/tex]

Putting the parameters into the formula, we get

[tex]B = \frac{4\pi \times 10^{-7} \times 113}{2 \times 75 \times 10^{-3} }[/tex]

[tex]B = 9.47 \times 10^{-4} \ T[/tex]

Hence, the magnetic field strength is 9.47 ×10⁻⁴ T

Now, for the energy density

Energy density can be calculated by using the formula,

[tex]u_{B} = \frac{B^{2} }{2\mu_{0} }[/tex]

Where [tex]u_{B}[/tex] is the energy density

Then,

[tex]u_{B}= \frac{(9.47\times 10^{-4} )^{2} }{2 \times 4\pi \times 10^{-7} }[/tex]

[tex]u_{B} = 0.36 \ J/m^{3}[/tex]

Hence, the energy density at the center of the loop is 0.36 J/m³

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Answer:

In giant molecular clouds

Explanation:

To find the stars that are just being born, one of the best places to search is giant molecular clouds.

An astronomical object known as a star is made up of a luminous plasma spheroid that is held together by gravity. The Sun is the star that is nearest to Earth. Other stars are also visible at night with the eye, but because of their great distances from Earth, they appear as stationary points of light.

Many of the brightest stars have names, and the most notable stars have been organized into constellations and asterisms. Star catalogs have been put out by astronomers that list the known stars and provide standardized stellar labels. An estimated 10²²–10²⁴ stars are alive in the observable cosmos.

These stars are all situated within the Milky Way galaxy, with only 4,000 of them being visible with the unaided eye.

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Answer:

F = M a

M = 3 kg

a = 2.2 m/s^2

T = tension in rope

T - M g = M a             Where T - M g is the net force on the bucket

T = M (g + a) = 3 kg * (9/80 + 2.20) m/s^2  = 36 Newtons

Answer: 570 J

Explanation:

The amount of heat gained by the piece of zinc can be calulctaed using   ∆Q = mc∆T

=> ∆T = 36-26 = 10°C

m = 0.15 kg, s = 380J/kg/°C

=> ∆Q = 0.15 x 380 x 10

= 570J

Answer:

Explanation:

Uranus takes about 84 years to circle the sun.

Pluto's existance has been known for 92 years. Uranius has completed 1 complete revolution. The numbers are reasonably close together and so Uranius is the answer.

Answer:

1.) Gas = Are the particles moving quickly in a radom pattern?

2.) Plasma = Are the particles electrically charged?

3.) Solid = Are the particles vibrating in a fixed position?

4.) Liquid = Are the particles sliding past each other?

Hope this helps!

Answer:

Mars

Explanation:

It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.

I hope it helps! Have a great day!

Anygays-

Mass, Speed and Kinetic Energy.The independent variable changed to . the dependent variable for both part i and part ii was .

We can solve this by analysing the choices and the relations between variables.

It's worth noting that Kinetic Energy is proportional to both speed and mass. Actually, Kinetic Energy is exactly proportional to those factors, meaning that the more mass or speed, the higher the Kinetic Energy.

Having said that, Part I and Part II must have speed and mass as indendepent variable, because Kinetic Energy depends on them.

Then, in the third question, the answer is Kinetic Energy becase that's the dependent variable in both cases Part I and Part II.

Just to remember, the Kinetic Energy is defined as

[tex]KE=\dfrac{1}{2}mv^2[/tex]

Where you can notice the relation between mass, speed and kinetic energy.

Therefore, the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).

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Answer

the right answer are Mass (Part I), Speed (Part II) and Kinetic Energy (Part III).

Explanation:

Answer: A CT scan involves multiple X-Ray images

Explanation:

I did it and it was correct