Describe and give an example of mutualism.


Describe and give an example of commensalism.


Describe and give an example of parasitism.


Describe and give an example of competition.


Describe and give an example of predation.

Answer:

C

Explanation:

Answer:

the first law of thermodynamics.

Explanation:

The amount of force required is (V) is v(t) = at.

What is velocity?

The speed of something in a given direction. Velocity is the directional speed of to an object in motion as an indication of its rate of the  change in position as in observed from a particular to frame of reference and it's as measured by a particularly standard of time.

Sol-As per the newton's first law of motion.

Vt= vo+at

Here,

velocity at time t is v(t).

Initial velocity is vo.

Acceleration is a and the time is t.

The initial velocity is zero. Put the 0 for vo in above equation.

v(t) = 0+at

v(t)= at

Thus, the acceleration of a falling body (a), the time it takes to fall (t), and its instantaneous velocity when it hits the ground.

(V) is v(t) = at.

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The direction of vector A which is parallel but opposite to the vector I is is 305°

Direction of vector I = 125°

Vector I makes a parallel line with vector A. Consider vector A and I to be collinear. Collinear lines makes up an angle of 180°

\(Angle_{A}\) + \(Angle_{I}\) = 180°

\(Angle_{A}\) + 125° = 180°

\(Angle_{A}\) = 55°

Direction of vector A = 360° - 55° = 305°

The direction of a vector is the angle, the vector creates with positive x-axis in counter clockwise direction.

Therefore, the direction of vector A is 305°

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The time taken by the car to stop will be 4.53 seconds. The final velocity is zero and the initial velocity will be 86.08 ft./s.

Velocity is a vector quantity which measures distance covered per unit time. It is given that the acceleration of the car a is  19 ft/s². The distance it covered is 195 ft.

We have the expression for final velocity v initial velocity u and the time t with acceleration a as follows where the final velocity v for the car is zero.

0 = U -  at

u = at.

The relation between time, acceleration and initial velocity with distance d is written as:

d = u t - 1/2 at²

  =  at²  -1/2 at²

  = 1/2 at²

Thus, t = √(2d/a)

            = √(2×195 ft / 19 ft/s²)  

            = 4.53 s.

Initial velocity u = a t

                          = 4.53 s ×19 ft/s²

                          = 86.08 ft./s

Therefore, the initial velocity will be 86.08 ft./s.

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Answer:

There is no change in the kinetic energy of the book and the potential energy of the book-Earth system increases.

Explanation:

This is because velocity is constantly increasing. This supports the idea that the kinetic energy of the book doesn't change and that the potential energy of the book-Earth system increases.

The true statement is that ;there is no change in the kinetic energy of the book and the potential energy of the book-Earth system increases.

We have to note that from the law of conservation of mechanical energy, the sum of the kinetic and potential energy of the book at any point remains constant.

If the book is being raised at constant speed, the the true statement is that ;there is no change in the kinetic energy of the book and the potential energy of the book-Earth system increases.

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Each of the five friends needs to pay £12 to cover the cost of their own meals and contribute towards the birthday person's meal. Using mean allows us to distribute the cost equally among the friends, ensuring a fair division of expenses for the meal.

To determine how much each of the five friends needs to pay, we can use the concept of averages (mean) and divide the total cost by the number of people paying.

In this scenario, the total cost of the meal for 6 people is £12 per person. Since the other 5 friends have decided to pay for the birthday person's meal, they will collectively cover the cost of their own meals plus the birthday person's meal.

To calculate the total cost covered by the five friends, we can subtract the cost of one person's meal (since the birthday person's meal is being paid by the group) from the total cost. The cost of one person's meal is £12.

Total cost covered by the five friends = Total cost - Cost of one person's meal

= (£12 x 6) - £12

= £72 - £12

= £60

Now, to find out how much each of the five friends needs to pay, we divide the total cost covered by the five friends (£60) by the number of friends (5).

Amount each friend needs to pay = Total cost covered by the five friends / Number of friends

= £60 / 5

= £12

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Answer: A dynamo falls under the branch of physics known as electromagnetism or electromagnetic physics. Electromagnetism is the study of the relationship between electricity and magnetism and how they interact with each other.

A dynamo is a device that converts mechanical energy into electrical energy using the principles of electromagnetism. It typically consists of a rotating coil of wire (armature) within a magnetic field. As the coil rotates, the magnetic field induces an electric current in the wire through electromagnetic induction.

The operation of a dynamo involves the application of various electromagnetic principles, such as Faraday's law of electromagnetic induction and Lenz's law. Understanding the behavior and functioning of dynamos requires knowledge of electromagnetism, including the principles of magnetic fields, electric currents, electromagnetic induction, and the relationship between electricity and magnetism.

Therefore, the study and analysis of dynamos and their operation fall within the domain of electromagnetism, a branch of physics.

Explanation:)

Answer:

The magnitude of the potential difference is 900 V.

Explanation:

Given;

mass of the bead, m = 4.0 g = 0.004 kg

charge of the bead, Q = 20 μC = 20 x 10⁻⁶ C

final velocity of the bead, v = 3 m/s

What is the magnitude of the potential difference V?

Apply the principle of conservation of energy;

The electric potential energy at the beginning is equal to kinetic energy of the bead  at the end of the journey.

qV = ¹/₂mv²

\(V = \frac{mv^2}{2q} \\\\V = \frac{0.004 \ \times \ (3)^2}{2(20 \times 10^{-6})}\\\\V = 900 \ V\)

Therefore, the magnitude of the potential difference is 900 V.

The magnitude of the potential difference (V) is equal to 900 Volts.

Given the following data:

To determine the magnitude of the potential difference (V):

We would apply the law of conservation of energy, which states that the electric potential energy possessed by the bead at the beginning is equal to the kinetic energy possessed by the bead at the end of the journey:

\(qV = \frac{1}{2} mv^2\\\\V = \frac{\frac{1}{2} mv^2}{q} \\\\V = \frac{\frac{1}{2} \times 0.004 \times 3.0^2}{20 \times 10^{-6}} \\\\V = \frac{ 0.002 \times 9}{20 \times 10^{-6}}\)

V = 900 V.

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Answer:

\(39000\ \text{kg m/s}\)

West

Explanation:

m = Mass of car = \(1.3\times 10^{3}\ \text{kg}\)

t = Time = 9 seconds

u = Initial velocity = 30 m/s

v = Final velocity = 0

Impulse is given by

\(J=m(v-u)\\\Rightarrow J=1.3\times 10^3(0-30)\\\Rightarrow J=-39000\ \text{kg m/s}\)

The magnitude of the total impulse applied to the car to bring it to rest is \(39000\ \text{kg m/s}\).

The direction is towards west as the sign is negative.

Answer:

C

Explanation:

Answer:

To convert nanometers (nm) to picometers (pm), you need to multiply the value by 1,000. Therefore, to convert 12 nanometers to picometers, you would perform the following calculation:

12 nm * 1,000 pm/nm = 12,000 pm

So, 12 nanometers is equal to 12,000 picometers.

The motion diagram for A-E is attached.

F) The drawings will change to reflect how the spacings of the respective positions are changing more irregularly.

A motion diagram is an image that represents the position of an object at various relatively spaced time intervals.

The art of using motion diagrams is called kinematics. it is useful for detecting the unknown speed of objects. For example, the movement of a rocket from earth to space, the movement of a ship over the water.

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In the case described above, there are at least three possible scenarios:

In any of the above cases, the correct step to take, if it is possible is for both scientists to meet, review notes and jointly execute a third investigation. This is because, in science, the guesswork only happens during hypothesis formulation.

Once a principle has been established via experimentation and properly documented, the same research can be replicated in any other location by any other person with the end results being the same if they all follow the exact report documented when the investigation was deemed successful.

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A metal ion (X) with a charge of 3+ is attracted to a non metal ion (Z) with a compound charge of 4-.  The formula of resulting compound is X₄Z₃.

A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements.

Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be shattered or new ones created during this process.

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Answer:

50kg

Explanation:

Force = 100N

Acceleration = 2 m/s2

Mass = ?

From formula,

Force = Mass * Acceleration

100 = Mass * 2

Mass = 50 kg

Hence ,mass of object is 50 kg.

Force(F) = 100N

Acceleration(a) = 2 m/s2

Mass(m) = ?

We know,

F = ma

100 = m x 2

m = 100/2

m = 50kg

Hence ,mass of object is 50 kg.

Answer:

50 kg

Explanation:

Force(F) = 100N

Acceleration(a) = 2 m/s2

Mass(m) = ?

We know,

F = ma

100 = m x 2

m = 50kg

hence ,mass is 50 kg.

From the darkest part of the object's shadow, you would be able to see a small amount of the light source. There would be a small amount of light that is visible, but it would be faint. On the other hand, from the lightest part of the shadow, you would be able to see much more of the light source. The light source would be far brighter and more visible, and you would be able to identify the source of the light.

Answer:

B. 20 kj is released

Explanation:

A.P.E.X. CST

Answer:

a) High and low pressures are 15.999 kilopascals and 10.666 kilopascals, respectively.

b) High and low pressures are 2.320 pounds per square inch and 1.547 pounds persquare inch, respectively.

c) High and low pressures are 1.632 meters water column and 1.088 meters water column, respectively.

Explanation:

a) High and low pressures in kilopascals:

101.325 kPa equals 760 mm Hg, then, we can obtain the values by a single conversion:

\(p_{high} = 120\,mm\,Hg\times \frac{101.325\,kPa}{760\,mm\,Hg}\)

\(p_{high} = 15.999\,kPa\)

\(p_{low} = 80\,mm\,Hg\times \frac{101.325\,kPa}{760\,mm\,Hg}\)

\(p_{low} = 10.666\,kPa\)

High and low pressures are 15.999 kilopascals and 10.666 kilopascals, respectively.

b) High and low pressures in pounds per square inch:

14.696 psi equals 760 mm Hg, then, we can obtain the values by a single conversion:

\(p_{high} = 120\,mm\,Hg\times \frac{14.696\,psi}{760\,mm\,Hg}\)

\(p_{high} = 2.320\,psi\)

\(p_{low} = 80\,mm\,Hg\times\frac{14.696\,psi}{760\,mm\,Hg}\)

\(p_{low} = 1.547\,psi\)

High and low pressures are 2.320 pounds per square inch and 1.547 pounds persquare inch, respectively.

c) High and low pressures in meter water column in meters water column:

We can calculate the equivalent water column of a mercury column by the following relation:

\(\frac{h_{w}}{h_{Hg}} = \frac{\rho_{Hg}}{\rho_{w}}\)

\(h_{w} = \frac{\rho_{Hg}}{\rho_{w}}\times h_{Hg}\) (Eq. 1)

Where:

\(\rho_{w}\), \(\rho_{Hg}\) - Densities of water and mercury, measured in kilograms per cubic meter.

\(h_{w}\), \(h_{Hg}\) - Heights of water and mercury columns, measured in meters.

If we know that \(\rho_{w} = 1000\,\frac{kg}{m^{3}}\), \(\rho_{Hg} = 13600\,\frac{kg}{m^{3}}\), \(h_{Hg, high} = 0.120\,m\) and \(h_{Hg, low} = 0.080\,m\), then we get that:

\(h_{w, high} = \frac{13600\,\frac{kg}{m^{3}} }{1000\,\frac{kg}{m^{3}} } \times 0.120\,m\)

\(h_{w, high} = 1.632\,m\)

\(h_{w, low} = \frac{13600\,\frac{kg}{m^{3}} }{1000\,\frac{kg}{m^{3}} } \times 0.080\,m\)

\(h_{w, low} = 1.088\,m\)

High and low pressures are 1.632 meters water column and 1.088 meters water column, respectively.

Answer:

- 0.33 m/s

Explanation:

An illustration is shown above,

In this case, since the two objects move in opposite directions before collision, then move together, the formula to be used is,

m1u1 - m2u2 = (m1 + m2)v

Where,

m1 = mass of the first object

u1 = initial velocity of the first object

v1 = final velocity of the first object

m2 = mass of the second object

u2 = initial velocity of the second object

v2 = final velocity of the second object

Therefore,

(4.0 • 3.0) - (8.0 • 2.0) = (4.0 + 8.0)v

12 - 16 = 12v

-4 = 12v

Divide both sides by 12,

-4 / 12 = 12v / 12

-1 / 3 = v

v = -0.33 m/s

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Explanation:

The size of a launch window is determined by a variety of factors, including the position of the launch site, the desired orbit, the position of the destination, and the characteristics of the spacecraft being launched.

One of the most important factors is the position of the launch site relative to the desired orbit. The launch site must be positioned in such a way that the rocket can achieve the required velocity and trajectory to reach the desired orbit. The angle and speed at which the rocket is launched are also crucial, as they affect the amount of fuel required and the trajectory of the rocket.

The position of the destination is another factor that affects the size of the launch window. For example, if the spacecraft is bound for a planet that is moving in its orbit, the launch window must be adjusted to account for the changing position of the planet.

In addition, the characteristics of the spacecraft being launched, such as its size, weight, and propulsion system, can also affect the size of the launch window. A larger spacecraft may require more fuel and a longer burn time, which may limit the available launch window.

Overall, the size of a launch window is determined by a complex set of factors, including the position of the launch site, the desired orbit, the position of the destination, and the characteristics of the spacecraft being launched. Launch planners use sophisticated computer models and simulations to calculate the optimal launch window based on these factors.

Answer:

2.55 s

Explanation:

To know how long does it take to rise, we will use the following equation:

Where:

vf is the final velocity, so at the highest point is 0 m/s

vi is the initial velocity, in this case, 25 m/s

a is the acceleration due to gravity, so a = 9.8 m/s²

And t is the time that it takes to rise.

Therefore, we can replace the values and solve for t as:

So, the answer is 2.55 s

Physics is the branch of science that deals with mass , time , space, energy and their inter-relations .

The application of

Answer: 29,035 feet

Explanation:

Answer:

b          d                   a

Explanation:

Answer:

Explanation:

Force per unit length between two cables at distance d carrying current I₁ and I₂ can be given by the following expression .

F = 10⁻⁷ x 2I₁ I₂ / d

I₁ = I₂ = 15000 A

F = 10⁻⁷ x 2I₁ I₂ / d

= 10⁻⁷ x 2 x 15000² / 4.5 x 10⁻³ m

= 10000 N .

It will be repelling force ie they will repel each other because current is in opposite direction .

No , we should not be concerned about mechanical strength because force does not depend on it .

Answer:Correct option is B)

In horizontal direction, two forces are acting on the block : 100 N force and friction force (f)

f=μN=μmg=0.5×10×10=50N

So, net force acting on the block in horizontal direction = 100 N-50 N = 50 N

acceleration of the block = Net force / mass of block = 50 N/10 kg = 5 ms

−2

Solve any question of Laws of Motion with:-

Explanation:

Answer:

E_{total} = -1.13 10² N / C

the sign indicates that the electric field points to the left

Explanation:

Let's start this exercise by looking for the electric field created by an infinite leaf, for this let's use Gauss's law

       \(\Phi_E\) = ∫ E. dA = \(q_{int}\) /ε₀

Let's define a Gaussian surface that is a cylinder, the normal to the faces of the cylinder is parallel to the field created by the face inside the surface, the normal of the cylinder walls is perpendicular to the electric field so its scalar product is zero

            \Phi_E = E (2A) = q_{int} /ε₀

the number 2 is due to having two faces

            E =    \(\frac{q_{int} }{A} \ \frac{1}{2 \epsilon_0 }\)

the surface charge density is

            σ= Q / A

we substitute

             E = \(\frac{\sigma }{2 \epsilon_o}\)

we can see that the field is independent of the distance.

Let's write the field for each leaf, remember that the field is salient for positive charges

sheet 1

           E₁ = \(+ \frac{\sigma_1}{2 \epsilon_o}\)

sheet 2

           E₂ = \(- \frac{\sigma_2}{2 \epsilon_o}\)

sheet 3

           E₃ = \(+ \frac{\sigma_3}{2 \epsilon_o}\)

at the point the Field of sheet 1 points to the right,

the field on sheet 2 points to the left and the field on sheet 3 points to the left.  Tthe electric field at the midpoint is

           E_ {total} = E₁ - E₂ - E₃

            E_ {total} = \(\frac{1}{2 \epsilon_o}\)  (σ₁ - σ₂ -σ₃)

calculate

             E_total = \(\frac{1}{2 \ 8.85 \ 10^{-12}}\)   (8.00 -4.00 -6.00) 10⁻⁹

             E_total = -1.13 10² N / C

the sign indicates that the electric field points to the left

Given:

• Voltage, V = 550 V

• Current, I = 70 A

• Time, t = 3 hours

Let's calculate the work done by the motor.

To calculate the work done, first find the amount of energy used.

Thus, we have:

Now, to calculate the work done by the motor in 3 hours, apply the formula:

Where:

P is the power in watts = 38500 W

t is the time in seconds = 3 x 60 minutes x 60 seconds

Hence, we have:

Therefore, the work done by the motor is 415.8 Mega Joules.

ANSWER:

C. 415.8 MJ