what is second law of netwons​

The acceleration and net force must both be zero if an object is travelling continuously to the right at a constant speed.

Newton's first law states that any object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the application of an external force. The tendency to resist changes in a motion situation is known as inertia.

The only time two objects have the same velocity is when they are going in the same direction and at the same speed. Objects moving at varying rates, in varying directions, or in both directions exhibit variable velocities.

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Answer:

zero

Explanation:

Given:

A ball bouncing eventually comes to stop.

To find:

What kind of a system is this?

Explanation:

An open system is a system where the free exchange of matter and energy with the surroundings takes place.

A closed system is where only the energy of the system is shared with the surrounding. In these kinds of systems, the exchange of matter does not take place.

An isolated system is where neither matter nor energy is exchanged between the system and the surrounding.

When a ball is bouncing, it gradually loses its kinetic energy to the surroundings and eventually comes to stop. But the mass of the ball remains the same. Thus this is a closed system.

Final answer:

The given system is a closed system.

Therefore the correct answer is option B.

Answer:

Heat of vaporization

Explanation:

When water is at high levels of temperature heat is move as an energy source into the air.    

Answer:

\(\boxed {\boxed {\sf Heat \ of \ vaporization}}\)

Explanation:

There are two options for this answer: heat of fusion or heat of vaporization.

Let's define both of the terms.

Heat of fusion:

Heat of vaporization:

The question asks us which type of heat provides the energy for the phase change of a liquid to a gas. Therefore, the correct answer is heat of vaporization.

The time taken by the object to hit the ground is 1.8 seconds.

The attraction that draws two objects together is known as gravitational force, sometimes referred to as gravity. Every mass-containing object pulls on nearby things gravitationally in a sizable way.

The time it takes for an object to hit the ground after being dropped off a cliff can be calculated using the formula:

t = √(2*d/g)

where t is the time, d is the distance fallen, and g is the acceleration due to gravity.

In this case, we don't know the distance fell, but we can use the horizontal velocity and time of travel to find it:

d = v * t

where v is the velocity (6 m/s), and t is time (3 seconds)

d = 6 * 3 = 18 m

Now we can use the distance fallen to calculate the time it takes to hit the ground:

t = √(2*d/g)

g is approximately 9.8 m/s^2

t = √(2*18/9.8) = √ (3.6) = 1.8 seconds

So, it takes 1.8 seconds for the object to hit the ground after traveling horizontally off a cliff at 6 m/s for 3 seconds.

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A 200.0 lb pumpkin is dropped from the roof of a 5-story (15 m) building. assuming it starts from rest and ignoring drag forces, with what speed does it impact the ground below is as follow:

The potential energy (P.E.) of an object is the energy it has due to its place, and the higher the object's height, the more potential energy it has. As a result, the pumpkin, with a weight of 200.0 lb, is at a height of

5 x 3.28 = 16.4 meters.

Its gravitational potential energy is equal to the product of the mass of the object, the acceleration due to gravity (9.8 m/s²), and its height above the ground. The gravitational potential energy can be calculated as follows:

Gravitational Potential Energy = mgh

where m is the mass, g is the acceleration due to gravity, and h is the height above the ground.

So, Gravitational Potential Energy

= (200.0 lb) x (1 kg/2.2 lb) x (9.8 m/s²) x (16.4 m)

= 1.867 kJ (rounded to three significant figures)

Now, we know that all of this potential energy will be transformed into kinetic energy (K.E.) when the pumpkin is released and starts falling. The kinetic energy formula is:

K.E. = ½mv²

where m is the mass of the object, and v is the velocity (speed) of the object.

Using the above formula, we can calculate the velocity (speed) of the pumpkin when it reaches the ground below.

K.E. = P.E. (since potential energy equals kinetic energy)

½mv² = mgh

We'll substitute in the numbers we've computed so far and solve for v.

v = √(2gh)

Where v is the speed, g is the acceleration due to gravity, and h is the height above the ground.

So, v = √(2gh) = √(2 x 9.8 m/s² x 16.4 m) = 18.2 m/s (rounded to two significant figures)

Therefore, the speed with which the pumpkin strikes the ground is 18.2 m/s.

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Answer:

Trough

Explanation:

Amplitude is how high/low the waves go from the center line

Nodes are the intersection between the wave and the center line

Crests are the top/peaks of each wave

Troughs are the bottom of each wave. Pretty much the opposite of crests

Answer:

Going downhill at a steady speed, the forces along the direction of motion are:

net force = m * a = 0

W * sin(7) - Fdrag = 0

so Fdrag = m * g * sin(7) where m=62.kg and g=9.8m/sec^2

Explanation:

If the wavelength of the waves is 20 feet long, the depth of the wave base would be approximately 10 feet deep.

In shallow water, the depth of the wave base is affected by the shape and slope of the seafloor.

If the seafloor is gradually sloping, the wave base will be deeper than if the seafloor is steeply sloping.

Additionally, as waves approach the shore, the decrease in water depth causes the wave speed to decrease and the wavelength to shorten, which in turn affects the depth of the wave base.

In such cases, the depth of the wave base can be calculated using mathematical formulas that take into account the depth of the water and the properties of the waves.

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The end of the detergent molecule which attaches to fat (grease) repels water molecules. It is known as hydrophobic, meaning "water fearing." By attempting to move away from the water molecules, the hydrophobic ends of the detergent molecules push up to the surface. This weakens the hydrogen bonds holding the water molecules together at the surface. The result is a break in the surface tension of the water.

Answer:

In a soap-and-water solution the hydrophobic (greasy) ends of the soap molecule do not want to be in the liquid at all. Those that find their way to the surface squeeze their way between the surface water molecules, pushing their hydrophobic ends out of the water. This separates the water molecules from each other.

Explanation:

Answer:

Uniform Motion

Explanation:

When an object travels equal distances (in this case displacement) in equal intervals of time, it is said to be in uniform motion.

Answer:

V≈0.034m³

Explanation:

Review:

Every point on the surface of a sphere's three-dimensional, perfectly round shape is equally spaced from the object's center. Spheres are a frequent type of item, including balls and globes. You only need to know a sphere's radius and enter it into a straightforward formula (V = 4⁄3πr³) to get its volume.

The volume of a sphere is calculated as 4/3 times pi times the cube of the radius. A number is cubed when it has been multiplied three times, in this example, three times the radius.

V = 4⁄3πr³

The ratio of a circle's circumference to its diameter is 4/3; this formula is used to calculate the volume of a sphere.

Given:

400 mm diameter

To find:

Volume in m^3

Steps:

Unit Conversion:

\(d=0.4m\)

Using the formulas

\(V=\frac{4}{3} \pi r^3\\d=2r\)

Solving for \(V\)

\(V=\frac{1}{6} \pi d^3=\frac{1}{6} *\pi *0.4^3\) ≈ \(0.03351m^3\)

Answer:

Explanation:

Hello!

The sphere has a diameter of 400mm which is equivalent to 40 cm.

The volume of a sphere equals to V = 4/3 π r^3

That is Pi multiplied by the radius of the sphere to the power of three, all multiplied by 4 and divided by 3.

The sphere has a diameter to 40 cm, and to get its radius we need to divide diameter by 2.

radius = 20 cm

Volume = 4/3 π 20cm^3

Volume = 4/3 * 3.14 * 20cm^3

Volume = 4/3 * 62.8 cm^3

Volume = 251.2 / 3 cm^3

Volume = 83.7(3) cm^3

let's make the number into a fraction, and then convert it into meters cubed:

83.7(3) = \(\frac{8373-837}{90}\) cm^3

Volume = \(\frac{7536}{90}\) cm^3

Now, because the measurement is cubed, we gotta divide centimeter by 100 cubed, to get meters cubed.

that will be our Volume divided by 1.000.000 (million).

\(\frac{7536}{90*1.000.000}\) meters^3

Volume = \(\frac{7536}{90,000,000}\) meters^3

Hope I helped!

Answer:

h

Explanation:

Coulomb's law, or Coulomb's inverse-square law, is an experimental law[1] of physics that quantifies the amount of force between two stationary, electrically charged particles. The electric force between charged bodies at rest is conventionally called electrostatic force or Coulomb force.[2] The law was first discovered in 1785 by French physicist Charles-Augustin de Coulomb, hence the name. Coulomb's law was essential to the development of the theory of electromagnetism, maybe even its starting point,[1] as it made it possible to discuss the quantity of electric charge in a meaningful way.[3]

The law states that the magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them,[4]

{\displaystyle F=k_{\text{e}}{\frac {q_{1}q_{2}}{r^{2}}}}{\displaystyle F=k_{\text{e}}{\frac {q_{1}q_{2}}{r^{2}}}}

Here, ke is Coulomb's constant (ke ≈ 8.988×109 N⋅m2⋅C−2),[1] q1 and q2 are the signed magnitudes of the charges, and the scalar r is the distance between the charges.

The force is along the straight line joining the two charges. If the charges have the same sign, the electrostatic force between them is repulsive; if they have different signs, the force between them is attractive.

Being an inverse-square law, the law is analogous to Isaac Newton's inverse-square law of universal gravitation, but gravitational forces are always attractive, while electrostatic forces can be attractive or repulsive.[2] Coulomb's law can be used to derive Gauss's law, and vice versa. In the case of a single stationary point charge, the two laws are equivalent, expressing the same physical law in different ways.[5] The law has been tested extensively, and observations have upheld the law on the scale from 10−16 m to 108 m.[5]

An online calculator of PV = nRT is a tool available on various websites that allows you to quickly solve problems related to the ideal gas law.

The ideal gas law, also known as the equation of state of an ideal gas, relates the pressure, volume, temperature, and amount (in moles) of an ideal gas.

The equation is expressed as PV = nRT, where P is the pressure in pascals, V is the volume in cubic meters, n is the amount of substance in moles, R is the ideal gas constant (8.314 J/(mol K)), and T is the temperature in Kelvin.

Online calculators of PV = nRT typically have fields for entering the values of three of the four variables, and the calculator solves for the fourth variable. For example, if you know the pressure, volume, and temperature of an ideal gas, you can use the online calculator to find the number of moles of the gas.

Some online calculators of PV = nRT may also allow you to convert the units of the variables, such as converting the pressure from atmospheres to pascals, or the temperature from Celsius to Kelvin.

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Answer:

6.34×10⁹ seconds

Explanation:

Applying,

V = d/t............. Equation 1

Where V = speed plate, d =  distance covered by the plate, t = time it takes the plate to travel

make t the subject of the equation

t = d/V............ Equation 2

From the question,

Given: d = 5 cm/yr = (5×3.154×10⁻⁹) = 1.577×10⁻⁸ m/s,  d = 100 meter

Substitute these values into equation 2

t = 100/1.577×10⁻⁸

t = 6.34×10⁹ seconds

Hence the time it takes the the plate to travel is 6.34×10⁹ seconds

The actual area of the room is 30m2.

How do you calculate the area?

A square or rectangle's area can be computed by dividing its height by its width. If the height and width are in centimeters, the area is shown in cm2. If the height and width are in meters, the area is shown in square meters (m2).

There are 100 cm in a meter, so each centimeter on a design at a scale of 1:100 corresponds to one meter. In the example, a square centimeter actually equals a square meter. The scale drawing depicts a 30cm2 area, although the space is actually 30m2.

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By looking at the ground beside a moving vehicle helps we can judge its speed and tell how fast it is moving.

What exactly is speed?

The rate at which an object's position changes, measured in metres per second, is referred to as speed. For instance, if an object begins at zero and moves three metres in three seconds, its speed is one metre per second. The formula for speed is straightforward: distance divided by time.

The rate at which an object moves from one position or location to another is referred to as its speed. Examine the definition of speed and use the steps provided to calculate an object's average speed.

The average speed of an object is the total distance travelled divided by the time required to travel that distance. It is a scalar quantity, which means that its only definition is magnitude.

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Answer:

the one that is clicked in the photo I think is right

Answer:

The answer is Revising

Answer:

D

Explanation:

Revising

Assuming you are referring to a uniformly charged spherical shell with radius "a", the electric field inside the shell (i.e., for r < a) is zero.

This can be explained by the fact that the shell has a symmetrical charge distribution, and hence, for any point inside the shell, the electric field due to all charges on the shell cancel out exactly. This is a consequence of the superposition principle of electric fields, which states that the total electric field at any point in space is the vector sum of the individual electric fields due to all the charges present. To see why the electric field inside the shell is zero, consider an arbitrary point P inside the shell at a distance "r" from the center of the shell. We can imagine dividing the shell into small elemental areas dA, each of which contains a small amount of charge dQ. The electric field vector due to each of these small charges at point P can be calculated using Coulomb's law as:

\(dE = (1 / 4\pi\epsilon _0) (dQ / r^2)r\)

Since the shell is uniformly charged, we can assume that the magnitude of the electric field due to each elemental charge is the same. Also, since the direction of ȓ is different for each elemental charge, the direction of the electric field vector dE varies as we move around the shell. However, due to the symmetry of the charge distribution, the magnitude of the electric field at point P due to all the elemental charges on the shell is the same, and hence the electric field due to all elemental charges is perfectly cancelled out at point P, resulting in a net electric field of zero.

Therefore, we can conclude that the electric field vector ~e(r) for r < a, where r is the distance from the center of the shell, is zero.

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If the toy car coasts up the frictionless slope while travelling at a speed of 0.075 m per second, its final speed in meter's per second is 2.14 m/s. Means the toy car travels 2.14m/s.

The potential energy that an object can store due to its position in relation to other objects, internal tensions, electric charge, or other circumstances is known as potential energy. Potential energy commonly refers to an object's gravitational potential energy.

If there were no resistance between the ball and the slope, the ball would simply slide down the slope without rotating called frictionless. Recall that a rotational force would be necessary for rotation, but since there is frictionless.

An increase in potential energy is equal to a decrease in kinetic energy

\(m*g*h= 1/2*m*u^{2} -1/2*m*v^{2}\)

\(v=\sqrt{u^{2}-2gh }\)

v=(3.61-1.47)

v=2.14m/s

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Answer:

.

Explanation:

Answer:

3.766 kg or 3.7 kg

Explanation:

F= M*A equation

Energy can not be lost. So, ( potential energy + kinetic energy ) at point 1 = ( potential energy + kinetic energy ) at point 2. Hence, option (D) is correct.

Energy cannot be created or destroyed, says the law of conservation of energy. However, it has the ability to change its form. The total energy of an isolated system is constant when all sources of energy are taken into account.

From law of conservation of energy: we can write that:

Total energy at point 1 = total energy at point 2

( potential energy + kinetic energy ) at point 1 = ( potential energy + kinetic energy ) at point 2.

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Answer: (C)

Explanation:  (B) is the weight of the box acting downwards

(A) is the frictional force acting on the box because of moving forward against the plane

(D) is the force that moves the box forward

( C) is perpendicular to the box which means it is at 90 degrees with the box. Normal usually means at 90 degrees

Answer:

I HAD THE SAME QUESTION AND SEARCHED IT UP AND GOT THE ANSWERS.

Explanation:

Answer:

in my opinion..

Answer:

PE = 64 J

m = 8 kg

g = 1.6 m/s2

h = 5 m

Answer: add it

Explanation:

Answer: 25.90 m/sec

Explanation:

Speed = Distance / Time

Speed = 1010 / 39

Speed = 25.90 m/s

The outer edge of the photosphere of the sun is the region where all the photons produced in the sun's core are absorbed. Therefore, the correct option is (C) Photosphere.

The photosphere is the outermost region of the sun's atmosphere that is visible. It is a thin layer of gas that generates the visible light that we see. It is the region of the sun that has the greatest intensity of light and the lowest temperature.

The light that passes through the photosphere of the sun is then absorbed and re-emitted at various wavelengths by the other parts of the sun's atmosphere, such as the chromosphere and corona. Consequently, the photosphere is the only region of the sun that we can directly observe.

The sun's core is the area where the fusion of hydrogen atoms takes place, producing tremendous amounts of energy that are emitted as light and heat. The core of the sun is the primary source of energy for all the planets in the solar system, as well as for life on Earth.

The core of the sun has a temperature of roughly 15 million degrees Celsius and a density of about 150 times that of water. It is shielded from us by the sun's outer layers, making it impossible to see it directly. However, through studying the light and other radiation emitted by the sun, scientists can gain a better understanding of the processes that occur in the sun's core.

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