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Answer:

160000 calories or 669440 Joules

Explanation:

Using the formula as follows;

Q = L × m

Where;

Q = amount of heat (J)

L = specific latent heat

m = mass (g)

* Latent heat (L) required for melting of ice is 80 calories/grams.

* Mass of ice in grams = 2kg × 1000 = 2000g.

Hence, Q = 80 × 2000

= 160000 Calories

1 calorie = 4.184J

160000 calorie = 160000 × 4.184

= 669440J

Answer:

[tex]\rho=3\times 10^{-8}\ \Omega-m[/tex]

Explanation:

Given that,

Voltage, V = 120 V

The length of the wire, l = 20 m

The current density of the wire, [tex]\dfrac{I}{A}=2\times 10^8\ A/m^2[/tex]

We need to find the resistivity of this wire. We know that,

[tex]R=\rho \dfrac{l}{A}[/tex]

Where

[tex]\rho[/tex] is the resistivity of wire

Also, [tex]R=\dfrac{V}{I}[/tex]

So,

[tex]\dfrac{V}{I}=\rho \dfrac{l}{A}\\\\\rho=\dfrac{V}{l\dfrac{I}{A}}[/tex]

Put all the values,

[tex]\rho=\dfrac{120}{20\times 2\times 10^8}\\\\=3\times 10^{-8}\ \Omega-m[/tex]

So, the resistivity of this wire is equal to [tex]3\times 10^{-8}\ \Omega-m[/tex].

Answer:

trueeeee

Explanation:

Answer:

True.

Explanation:

In biology, selective breeding is the mechanism by which certain traits or a combination of traits are consciously selected in animal breeding or plant breeding and cultivation. Artificial selection is seen as a counterpart to natural selection, the mechanism by which, in nature, individuals are selected who are better adapted to their natural environment. Both processes have the same genetic principles and background.  Man selects the individuals with the desired traits to produce progeny, making these traits more and more common.

Answer:

E: None of the above

Explanation:

Since the force on the wire F = ∫idL × B where i = current in wire = 2.0 mA = 2.0 × 10⁻³ A, dL = vector length of wire = dyj and we integrate from y₁ = 0 m and y₂ = 0.25 m, and B = magnetic field = (0.3y)i + (0.4y)j

So, F = ∫idL × B

and we integrate from y₁ = 0 m and y₂ = 0.25 m

F = 2.0 × 10⁻³ A∫₀⁰°²⁵[dyj m × (0.3y)i + (0.4y)j]

F = 2.0 × 10⁻³ A∫₀⁰°²⁵[dyj m × (0.3y)i + dyj m × (0.4y)j]

F = 2.0 × 10⁻³ A∫₀⁰°²⁵[(0.3y) × dy(j × i) + 0.25 × (0.4y)(j × j)]

F = 2.0 × 10⁻³ A∫₀⁰°²°⁵[(0.3ydy(-k) + 0.1y)(0)]

F = 2.0 × 10⁻³ A∫₀⁰°²⁵(-0.3ydy)k

F = 2.0 × 10⁻³ A[-0.3y²/2]₀⁰°²⁵k

F = -2.0 × 10⁻³ A[0.3(0.25)²/2 - 0.3(0)²/2]k

F = -2.0 × 10⁻³ A[0.3(0.0625)/2 - 0]k

F = -2.0 × 10⁻³ A[0.3(0.0625)/2]k

F = -1 × 10⁻³[0.01875]k N

F = -[0.01875 × 10⁻³]k N

F = -[1.875 × 10⁻⁵]k N

Since the answer is not contained in the options, the answer is E.

Answer:

You either need to lower the volume so the sounds intensity is lessened. Or you can pad the walls to absorb the sound rather than defect.

Explanation:

Sound intensity allows it to be heard further, but in an enclosed room it will start returning. Sound will deflect off of hard objects do to its interactions with solids. A softer and foamy material can dampen it.

Answer:

0.500 T

Explanation:

Since the change in time and the number of coils are both 1, I set the problem up to be 1.3=(1.5(x)-13(x)). I then plugged in numbers for x until I got the answer to be 1.3 V.

Answer:

D) 1 & 2

Explanation:

Ice melting can be refrozen and although the pencil breaks, it doesn't change the chemical formula of the pencil

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Actually Welcome to the concept of Net force on a body.

We know that net force on a body is the force that is calculated from all direction and added , if there is any force remained at last, then the forces are unbalanced,

and if the net force on a body is Zero, then it is a balanced force,

here,

Force to left on skier = 50 N

Force to right on skier = 40 N

hence the net force = left force - right force

Net force = 50 - 40 ==> 10 N

hence the Net force is 10 N in the left direction of the skier.

Answer: Yes

Explanation:

Given

Martin initial speed is [tex]u=20\ m/s[/tex]

Stones is at 170 m ahead

Deceleration [tex]a=2\ m/s^2[/tex]

Using the equation of motion [tex]v^2-u^2=2as[/tex]

Insert the values

[tex]0-20^2=2\times (-2)s\\s=\dfrac{400}{4}\\\\s=100\ m[/tex]

So, it took 100 m to stop completely. Hence martin will be able to stop in time.

Answer:

The further implementations of nuclear power are limited because although nuclear energy does not produce CO2 the way fossil fuels do, there is still a toxic byproduct produced from uranium-fueled nuclear cycles: radioactive fission waste.

Explanation:

Answer:

Disadvantages of Nuclear Power

The further implementations of nuclear power are limited because although nuclear energy does not produce CO2 the way fossil fuels do, there is still a toxic byproduct produced from uranium-fueled nuclear cycles: radioactive fission waste.

Explanation:

Answer:

a) v'=0 ,  B)  v'= 125 miles/h

Explanation:

This is a relative speed exercise, the speed of a body is

          v ’= v - u

where v is the speed with respect to the Earth and u the speed of the reference frame with respect to which we want to calculate

a) with respect to a car traveling east at u = 60 miles / h

          v ’= 60 -60

          v ’= 0

with respect to this vehicle the speed of the car is zero

b) with respect to a truck traveling west at u = -65 miles / h

           v = 60 - (-65)

           v = 125 miles / h

Answer:

Oxygen or more precisely, the O-15 isotope.

Answer:

B because 17100 is the half of the carbon

Answer:

C a fast-moving cold front moved through the area.

Explanation:

This is because, since there is a there is a thunderstorm and high winds in the area, this can only be caused by a fast moving front. Also there is a temperature drop, this can only be caused by the fast moving cold front since a cold front has a low temperature.

Thus, for the area to experience thunderstorms with high winds and a drop in temperature, a fast-moving cold front moved through the area.

Answer:

Defined below

Explanation:

Climate change is simply the long term change in the average weather patterns that are associated with the local, regional and global climates of the earth. Climate change is usually driven by human activities like burning of fossils; natural processes like cyclic ocean patterns; external factors like volcanic eruptions.

Answer:

The correct answer is - 30 feet.

Explanation:

According to the parking laws one should not park within 30 feet of any flashing signal, stop sign, or traffic signal it is not allowed. Parking is also not allowed in case of the following situations -

On crosswalks

In front of driveways

double parking

On sidewalks.  

at "No Parking" signs are posted.

Within intersections or 20 feet of an intersection.

Within 15 feet of a fire hydrant.

Answer:

30 ft

Explanation:

You are not allowed to park within 30 feet of any flashing signal, stop sign, or traffic signal.

Answer:

RT = 54 Ohms

Explanation:

Given the following data;

Resistance = 18 Ohms

Voltage = 12 Volts

To find the equivalent resistance (RT) of the circuit;

For a series connection, the formula is;

RT = R1 + R2 + R3

RT = 18 + 18 + 18

RT = 54 Ohms

Or

RT = 3*R

RT = 3 * 18

RT = 54 Ohms

Answer:

1 + 3 = 7. X = 2 -9+7=8

Explanation:

Here,

Answer:

1. Icy

This is so because the icy surface will be slippery due to ice and water residue on it. Not only the stone, anything that goes on the icy surface is likely to slip. There won't be much friction offered by the surface.

If we talk about the sandy surface, the stone won't go far and will be stopped at the nearest point possible and it's also possible that the stone will settle down in the surface.

The dry and cemented surfaces will cause friction when the stone will be thrown on them, which will stop the stone from going far away.

2. Streamline is the body shape which offers very little resistance to the flow of air.

3. Spring balance is a device used for measuring weight of an object object.

(or the force acting on an object)

Answer:

longitudinal

Explanation:

the position that has least kinetic energy is option D

Answer:

C

Explanation:

When the planet in motion should have the same speed so until it should be acted by an outer force. This statement explained the movement of the planets.

The information regarding the first law of motion is as follows:

Therefore, the third option is correct.

Learn more: brainly.com/question/17738679

Answer:

c. Protons and electrons

Explanation:

electrons carry out negative charge

protons carry out positive charges

Answer: A.) concave lens

Explanation: i hope this helps shawtay :)

In general, a concave lens (also known as a diverging lens) is used to correct nearsightedness, as stated in "Take a Closer Look." Option C is correct.

A lens is an optical component that is used to refract (bend) and focus light. It is typically made of a transparent material, such as glass or plastic, and has a specific shape that allows it to alter the path of light as it passes through.

Here,
In general, a concave lens (also known as a diverging lens) is used to correct nearsightedness, as stated in "Take a Closer Look."

A concave lens is thinnest at the center and thicker at the edges, which causes light rays passing through the lens to diverge or spread out. By placing a concave lens in front of a nearsighted eye, the lens causes incoming light rays to diverge more before they reach the eye's lens, which then focuses them properly on the retina, resulting in clearer vision.

Learn more about the lens here:
https://brainly.com/question/2919483
#SPJ6

Answer:

Increasing temperatures evaporate water faster, causing an increase in salinity.

Explanation:

When the water molecules of the ocean become heated, they expand. ... Since warmer water thus can hold more salt and other molecules than cold water; it can have a higher salinity.

The correct option is C, increasing temperatures cause faster evaporation of water which results in an increase in salinity.

Hence we can conclude that as the temperature rises, the process of evaporation takes place more rapidly which decrease the concentration of salt in water, which leads to higher salinity.

Learn more about temperature mapping here:

https://brainly.com/question/1418606

#SPJ10

Answer:

Req= 220 ohm

Explanation:

In series combination just add the resistances.

Req=R1+Req(23)

Req=100+120

Req= 220 ohm

[tex]\boxed{\underline{\bf \: ANSWER}}[/tex]

The current sensitivity of a galvanometer depends upon the following factors :-

___________

Hope it helps.

RainbowSalt2222