class 7 Physics answera plot measuring 2 km in length and 1 by 2 km in breadth has area of how many hectare ​

Answer:

Vx = 14.74 m/s.

Vy = 10.32 m/s

Explanation:

Applying,

Vx = Vcos∅................ Equation 1

Where Vx = Horizontal component of the initial velocity, V = Intial Velocity, ∅ = Angle to the horizontal

From the question,

GIven: V = 18.0 m/s, ∅ = 35.0°

Substitute into equation 1

Vx = 18(cos35.0°)

Vx = 18(0.819)

Vx = 14.74 m/s.

Also for vertical component,

Vy = Vsin∅................... Equation 2

Where Vy = vertical component of the initial velocity

Substituting the values above into equation 2

Therefore,

Vy = 18(sin35°)

Vy = 10.32 m/s

The cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. A cell wall has layers and covers the plant cells in order to protect it. The cardboard can cover it more with its layers rather than the jump rope.

The cardboard would be a better item than the jump rope because the cardboard would be able to act as a better cell wall since it can act more closely to an actual cell wall. The cardboard can cover it more with its layers rather than the jump rope.

A plant cell is a eukaryotic cell that contains a true nucleus and certain organelles to perform specific functions. However, some of the organelles present in plant cells are different from other eukaryotic cells.

The cell wall of a plant is made up of cellulose. Cellulose is a long, linear polymer of several glucose molecules.

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Explanation:

Q = mc∆T

= (0.34 kg)(94 J/kg-°C)(25°C)

= 799 J

BLUEBLACK COLOR IS FORMED WHEN STARCH AND IODINE IS MIXED .

Answer:

An ionic compound is named first by its cation and then by its anion. The cation has the same name as its element.

Answer:

Vinyl Moon

Explanation:

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Answer:

In physics, equations of motion are equations that describe the behaviour of a physical system in terms of its motion as a function of time.

There are 5 types of equations of motion:

[tex]v = u + at[/tex]    (Velocity)                                                                [tex]v =[/tex] final velocity [tex]v^{2} = u^{2} + 2as[/tex]   (Velocity squared)                                             [tex]u =[/tex] initial velocity   [tex]s = ut + \frac{1}{2} at^{2}[/tex]  (Displacement with positive acceleration)      [tex]a=[/tex] acceleration[tex]s = vt - \frac{1}{2} at^{2}[/tex]   (Displacement with negative acceleration)      [tex]t=[/tex] time[tex]s=\frac{1}{2} (u+v) t[/tex]  (Displacement)                                                    [tex]s=[/tex]  displacement                                                                                 (vector version of distance)

Answer:

Our atmosphere is a mixture of gases that surround Earth. It is kept in place by the pull of Earth's gravity. If Earth was a much smaller planet, like Mercury or Pluto, its gravity would be to weak to hold a large atmosphere

Explanation:

Answer:

Explanation:

i. Accuracy in measurement is a term that is used to describe the closeness of a measured value to its actual value. It relates the actual value to the measured values.

Therefore in the given question, Amy's measurement of the salt's mass is accurate because her final value is close to all the measured values.

ii. Precision in measurement is a term that is used to describe the closeness of different measured values to each other. It relates the keenness in the measured values.

Thus, Amy's measurements of the salt's mass is precise because the values of the masses are close to one another.

Answer:

hehe

Explanation:

The direction of electric field in the two small charged sphere can be outward if both are positive and inward if both are negative.

The direction of electric field in a charged sphere can be inward or outward. The electric field will point inwards for a negatively charged sphere and outward for a positively charged sphere.

The type of charge at the center of the sphere will determine the direction of the electric field.

Thus, the direction of electric field in the two small charged sphere can be outward if both are positive and inward if both are negative.

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Answer:

4.5V

Explanation:

In a arrangement of cells, the cells could be joined end to end(series) or to a common junction (parallel).

When cells are joined in series, the total emf of the cell is the sum of the individual emf of all the cells.

Hence;

Total emf = 1.5V + 1.5V + 1.5 V = 4.5 Volts

Answer:

Explanation:

Heredity is defined as the passage of genetic instructions from one generation to the next.

Answer:

[tex](a)\\1.97\times 10^8 m/s\\(b)\\1.99\times 10^8 m/s \\(c)\\2.21 \times 10^8 m/s[/tex]

Explanation:

According to the definition of refractive index, the refractive index of the material is defined as the ratio of speed of light in vacuum to the speed of light in medium.

(a) refractive index, n = 1.52

[tex]n=\frac {c}{v}\\\\1.52 = \frac{3\times 10^8}{v}\\\\v = 1.97\times 10^8 m/s[/tex]

(b) refractive index, n = 1.51

[tex]n=\frac {c}{v}\\\\1.51 = \frac{3\times 10^8}{v}\\\\v = 1.99\times 10^8 m/s[/tex]

(c) refractive index, n = 1.36

[tex]n=\frac {c}{v}\\\\1.36 = \frac{3\times 10^8}{v}\\\\v = 2.21\times 10^8 m/s[/tex]

Answer:

10.92 m/s²

Explanation:

Applying,

s = ut+at²/2.................... Equation 1

Where s = distance. u = initial velocity, t = time, a = acceleration.

From the question,

Given: s = 400 meters, t = 8.56 seconds, u = 0 meters/seconds (Starts from rest)

Substitute these values into equation 1

400 = 0(8.56)+a(8.56²)/2

400 = 73.2736a/2

73.2736a = 800

a = 800/73.2736

a = 10.92 m/s²

Explanation:

hope you understood fella

As the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the  wagon and the little girl is 60.3kg.m/s

Given the data in the question;

Impulse is the force applied for certain amount of time which results in change in momentum.

[tex]I = M( v-u )[/tex]

To determine the impulse you imparted to the  wagon and its passenger.

Total mass[tex]M = ( m_s + m_w) = ( 25kg + 8.5kg ) = 33.5kg[/tex]

So, we substitute our given values into the equation

[tex]I = 33.5kg(\ 1.8m/s\ -\ 0m/s\ )\\\\I = 33.5kg \ *\ 1.8m/s \\\\I = 60.3kg.m/s[/tex]

Therefore, as the wagon is been pulled forward with a constant force, the impulse Impulse imparted to the  wagon and the little girl is 60.3kg.m/s

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Answer:

No, work isn't being done by Johnny.

Explanation:

Work can be defined as the energy transferred to a physical object by exertion of a force on the object to cause a displacement of the object. Thus, work is typically done when a person or simple machine move an object over a distance through the application of a force.

Mathematically, work done is given by the formula;

Work done = force * distance

[tex] W = F * d[/tex]

Where,

W is the work done

F represents the force acting on a body.

d represents the distance covered by the body.

In this scenario, Johnny's push didn't cause a displacement of the wall and as such no work is done.

Answer:

True

Explanation:

Minerals can be defined as any form of naturally occurring, inorganic solid substance characterized by a crystal structure. Also, minerals are homogeneous in nature with a defined chemical composition and characterized by a crystal structure comprising of ions, atoms, or molecules in an orderly arrangement.

Generally, molecules attach on the inside of a mineral to give it shape. Therefore, the molecule of a mineral is a crystal three-dimensional regular structure (arrangement) of chemical particles that are bonded together and determines its shape.

Furthermore, the chemical composition (property) of a mineral reflect the presence and arrangement of atoms in each.

Due to the fact that these molecules are structurally arranged (ordered) and are repeated by different symmetrical and translational operations, they determine the shape of minerals. Some examples of minerals are iron, copper, aluminum, tin, coal, quartz, feldspar, mica, etc.

Additionally, inorganic-crystalline solid substances which are found naturally within earth are referred to as minerals.

In conclusion, a mineral in the earth's crust exists naturally in form of solid elements or compounds.

Answer:

Force = mass x acceleration

Explanation:

According to the Newton's second law, the net force acting on the object is proportional to the rate of change of momentum of the body.

So, Force is given by

F = m a

where, F is the force, m is the mass and a is the acceleration.

when the mass is more, the acceleration is less as the force applied by the truck is same.

Answer:

The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.

Explanation:

Answer:

a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.

Aslaam 3lekm m3akm yaseen my 8nat alninkm

Answer:

Explanation:

Use the one-dimensional equation

[tex]v_f=v_0+at[/tex] which says that the final velocity of an object is equal to the object's initial velocity plus its acceleration times time. We are looking for time. That means the equation looks like this:

0 = 30 + (-4)t and

-30 = -4t so

t = 7.5 sec

The time taken for the car to stop if its acceleration is -4.0 m/s² is           7.5 seconds.

According to equation of motion, three motion equations commonly referred to as the rules of constant acceleration, exist for a uniform acceleration.

To derive the components such as displacement(s), velocity(initial =u and final = v), time(t), and acceleration(a), these equations are utilized.

The equations can be,

As we have to Calculate the time :

The formula for the motion equation is

v = u - at

v - final velocity

u - initial velocity

a - acceleration

t - time

Here, v = 0 ,

u = 30 m/s

a = -4 m/s²

So substituting in, v = u - at

⇒0 = 30 - 4t

⇒4t = 30

⇒t = 30/4

t = 7.5 seconds

Therefore, the required time calculated is 7.5 seconds.

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2.75 m/s. Hope this helps.

Answer:

[tex] = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times m\times {2}^{2} \\ = 2m \: joules[/tex]

Answer:

111011

Explanation:

59/2 = 29, remainder is 1

29/2 = 14, remainder is 1

14/2 = 7, remainder is 0

7/2 = 3, remainder is 1

3/2 = 1, remainder is 1

1/2 = 0, remainder is 1

Answer:

All options presented were applied to the answer.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

What did you include in your response? Check all that apply. The law of conservation of momentum is satisfied. The momentum before the collision is 1.5 kg • m/s. The momentum after the collision is 1.5 kg • m/s. The momentum before and after the collision is the same.

Explanation:

The sample response presented in the question above, refers to a closed system where two molecules after colliding satisfy the conservation of momentum law, which can also be called the conservation law of linear momentum. This law states that in a closed system the initial state of the components must be maintained and remain the same until the final state, that is, the two molecules maintain their ideal momentum before and after the collision. This means that if they had 1.5 kg • m/s before the collision, this value must be maintained after the collision. All these concepts are presented in the sample response.

Answer:

Newton’s first law of motion states that there must be a cause—which is a net external force—for there to be any change in velocity, either a change in magnitude or direction. An object sliding across a table or floor slows down due to the net force of friction acting on the object.

Explanation:

Answer:

24 m/s²

Explanation:

The given parameters are;

The initial acceleration of the object, a = 16 m/s²

Let 'm' represent the initial mass of the object

The initial force acting on the object, F = m × a

∴ F = 16 × m = 16·m

When the mass is doubled, we have;

The new mass of the object, m₂ = 2 × m = 2·m

When the net force acting on the object triples, we have;

The new net force acting on the object, F₂ = 3 × F = 3 × 16·m = 48·m

From F = m × a, we have;

a = F/m

∴ The new acceleration of the object, a₂ = F₂/m₂

From which, by plugging in the values, we have;

a₂ = 48·m/(2·m) = 24

The new acceleration of the object, a₂ = 24 m/s².