Which of the following statements are true concerning compound microscopes?
In a compound microscope, the image formed by the objective lens is smaller than the object.
In a compound microscope, the final image is formed by the objective lens.
The focal length of the objective in a microscope is very large compared to the focal length of the eyepiece.
In a compound microscope, the final image is a virtual image.
In a compound microscope, the image formed by the objective lens is a real image.

Answer:

stop telling the teacher your secrets and talk to her about it be like "hey i opened up to you because i trusted you and you broke that trust i wanted someone to talk to but you told my parents and to me i find that very rude."

Something like that if you want

Explanation:

When two forces act on an object to cause only rotation, they create a torque or moment.

Torque, also known as moment, is the rotational equivalent of force. It is the product of force and the perpendicular distance from the axis of rotation to the line of action of the force. When two forces act on an object in such a way that their lines of action do not pass through the same point, a torque or moment is generated.

The torque generated by each force is determined by multiplying the force magnitude by the perpendicular distance from the axis of rotation to the line of action of that force. The net torque on the object is the sum of the torques generated by the individual forces. If the net torque is non-zero and there are no other forces causing translational motion, the object will experience pure rotation.

In summary, when two forces act on an object to cause only rotation, they create a torque or moment. The net torque determines the rotational motion of the object, while other factors such as the object's mass distribution and rotational inertia influence the resulting rotation.

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A plane electromagnetic wave is traveling vertically downward with its magnetic field pointing eastward. Then  electric field of the plane electromagnetic wave must be pointing northward.

The electric field of the plane electromagnetic wave must be pointing northward. This is because the magnetic field is perpendicular to the electric field, and the wave is traveling vertically downward. Therefore, the electric field must be oriented in a direction that is perpendicular to both the magnetic field and the direction of propagation. In this case, since the magnetic field is pointing eastward, the electric field must be pointing northward.

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Answer:

atom

Explanation:

the first guy who gave link this is for you:

we cannot use links in brainly

Thankyou.

1. To find the time when the body reaches the ground, we can use the vertical motion equation:

h = v₀y * t + (1/2) * g * t²

where:

h = height of the tower = 15m

v₀y = initial vertical velocity = v₀ * sin(θ) = 30m/s * sin(30°)

g = acceleration due to gravity = 9.8m/s²

t = time

Plugging in the values:

15 = (30 * sin(30°) * t) + (0.5 * 9.8 * t²)

Simplifying the equation:

15 = 15t * 0.5t² + 4.9t²

Combining like terms:

15 = 7.5t² + 4.9t²

Simplifying further:

15 = 12.4t²

Dividing both sides by 12.4:

t² = 15 / 12.4

Taking the square root of both sides:

t = √(15 / 12.4)

Calculating the value:

t ≈ 1.01 seconds

Therefore, the time it takes for the body to reach the ground is approximately 1.01 seconds.

2. To find the displacement vector, we need to calculate the horizontal and vertical components separately.

Horizontal component:

The horizontal displacement can be calculated using the formula:

x = v₀x * t

where:

v₀x = initial horizontal velocity = v₀ * cos(θ) = 30m/s * cos(30°)

t = time is taken to reach the ground (previously calculated as approximately 1.01 seconds)

Plugging in the values:

v₀x = 30m/s * cos(30°)

t = 1.01 seconds

Calculating the value:

v₀x ≈ 26.02 m/s

Vertical component:

The vertical displacement can be calculated using the formula:

y = v₀y * t + (1/2) * g * t²

where:

v₀y = initial vertical velocity = v₀ * sin(θ) = 30m/s * sin(30°)

g = acceleration due to gravity = 9.8m/s²

t = time is taken to reach the ground (previously calculated as approximately 1.01 seconds)

Plugging in the values:

v₀y = 30m/s * sin(30°)

t = 1.01 seconds

Calculating the value:

v₀y ≈ 15 m/s

Now we have the horizontal and vertical components of the displacement vector:

Horizontal component: x ≈ 26.02 m/s

Vertical component: y ≈ 15 m/s

Therefore, the displacement vector of the body is approximately (26.02 m/s, 15 m/s).

3. To find the angle when the body hits the ground, we can use the vertical and horizontal components of the velocity.

The horizontal component of the velocity, v₀x, can be calculated using the formula:

v₀x = v₀ * cos(θ)

where:

v₀ = initial velocity = 30m/s

θ = angle of projection = 30 degrees

Plugging in the values:

v₀x = 30m/s * cos(30°)

Calculating the value:

v₀x ≈ 26.02 m/s

The vertical component of the velocity, v₀y, can be calculated using the formula:

v₀y = v₀ * sin(θ)

where:

v₀ = initial velocity = 30m/s

θ = angle of projection = 30 degrees

Plugging in the values:

v₀y = 30m/s * sin(30°)

Calculating the value:

v₀y ≈ 15 m/s

Now, to find the angle when the body hits the ground, we can use the inverse tangent function:

θ = arctan(v₀y / v₀x)

Plugging in the values:

θ = arctan(15 m/s / 26.02 m/s)

Calculating the value:

θ ≈ 30.96 degrees

Therefore, the angle when the body hits the ground is approximately 30.96 degrees.

4. To find the maximum height, we can use the vertical motion equation:

h = v₀y² / (2 * g)

where:

h = maximum height

v₀y = initial vertical velocity = v₀ * sin(θ) = 30m/s * sin(30°)

g = acceleration due to gravity = 9.8m/s²

Plugging in the values:

h = (30 * sin(30°))² / (2 * 9.8)

Calculating the value:

h ≈ 27.55 meters

Therefore, the maximum height reached by the body is approximately 27.55 meters.

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Answer: Fibres are very thin, thread-like strands from which fabrics or cloth is made. Examples of fibres are cotton, wool, silk, flax, jute, nylon, polyester, polyacrylic. The fibres are spun into yarn which can then be woven on a Loom to make a fabric or cloth

Explanation:

Answer:

The answer is Liquid.

Explanation:

Liquids have a fixed volume but no fixed shape.

If the tension in rope is 145 N, work done to move crate 4.0 m is 442.4 J.

To solve this problem, we first need to find the force acting on the crate in the horizontal direction. This force is equal to the tension in the rope multiplied by the cosine of the angle between the rope and the horizontal:

F_horizontal = Tension * cos(angle) = 145 N * cos(40.8 degrees) = 110.6 N

Next, we can calculate the work done to move the crate using the formula:

Work = Force * Distance * cos(theta)

where theta is the angle between the force and the direction of motion. Since the crate is moving with a constant speed, we know that the net force on it is zero. Therefore, the force of friction acting on the crate must be equal in magnitude to the force we calculated above:

F_friction = F_horizontal = 110.6 N

The angle between the force of friction and the direction of motion is 180 degrees, so we have:

Work = F_friction * Distance * cos(180 degrees) = - 110.6 N * 4.0 m * cos(180 degrees) = - 442.4 J

The negative sign indicates that the work done is in the opposite direction to the displacement of the crate. In other words, the work done by the force of friction is negative because it acts against the motion of the crate. Therefore, the work done to move the crate 4.0 m is -442.4 J.

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Answer:

Manufacturing industry in the US

The largest manufacturing industries in the United States by revenue include petroleum, steel, automobiles, aerospace, telecommunications, chemicals, electronics, food processing, consumer goods, lumber, and mining. A large portion of U.S. industrial output, the United States leads the world in airplane manufacturing.

Explanation:

Einstein’s understanding of curved space-time helped him understand gravity better on Earth.

The man Albert Einstein was the person who first brought up the idea of relativity. The relativity theory drove home the assertion that there are no absolutes in the universe.

On the other hand, the works of Aristotle and Newton about gravity did not include this element of relativity. Though the work of Newton was highly empirical, the results did not incorporate the ideas of relativity.

Thus, what distinguishes Einstein from Newton and Aristotle is Einstein’s understanding of curved space-time helped him understand gravity better on Earth.

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The magnetic field exactly midway between the wires, as viewed from your position, is zero.

Explanation:-

When two horizontal wires with identical currents carry current directly towards an observer, the magnetic field exactly midway between the wires, as viewed from the observer's position, is zero or no magnetic field is produced due to the wires. This is because the magnetic fields produced by both wires cancel each other out.

Let’s first talk about the direction of the magnetic field produced by the wires.

According to the right-hand rule, the magnetic field for a current-carrying wire points towards the direction of the curl of fingers of the right hand when the thumb points in the direction of the current.

A current flowing in the plane of the page towards an observer means that the current is pointing out of the page. Therefore, the magnetic field due to each wire will be pointing in the direction perpendicular to the current-carrying wire in a counterclockwise direction (as viewed from above).

So, if we look at the point directly midway between the two wires, we will see that the magnetic fields from each wire are equal in magnitude and opposite in direction. As a result, they will cancel each other out at the midpoint and there will be no net magnetic field there.

Therefore, the answer is that the magnetic field exactly midway between the wires, as viewed from your position, is zero.

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The mass M of the star is mathematically given as

M=24.269kg

Question Parameters

Orbital period P= 14.3*24*60*60 s

P= 1235520s

Speed V=160000

Generally, the equation for the Radius is  mathematically given as

R =\(\frac{ V*t}{ 2*pi}\)

Therefore

R =\(\frac{ ( 160000 )*(1235520 s)}{ 2*3.142}\)

R=\(3.14581795*10^{10}\)

Where

M*v^2/R = GM^2/(2R)^2

Therefore

M=\(=4(v^2)R/G\\\\ =4(240^2)R/G\\\\ = \frac{4*(160000)^2)*3.14581795*10^{10}}{6.67*10^{-11}}\)

M=4.82956159*10^{31}kg

Considering, that the mass of our Sun is 1.99*10^{30} kg.

The mass M of the star is

M\(=\frac{4.82956159*10^{31}}{1.99*10^{30}}\)

M=24.269

In conclusion, the mass M of the star is

M=24.269

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Answer:

The main role of neutrons is to reduce electrostatic repulsion inside the nucleus.

Explanation:

:) Good luck my friend

Answer:

sound waves

Explanation:

The kinetic energy of the meatball is transferred into the surroundings through sound waves.

When the meatball hits the wall, the kinetic energy of the meatball causes vibrations in the wall and the surrounding air. These vibrations create sound waves which transfers the kinetic energy to sound energy until it runs out of energy.

When an object / medium vibrates, the particle of the object / medium starts to move. This movement of particles is called as sound waves. It is a type of mechanical wave.

Therefore, the kinetic energy of the meatball is transferred into the surroundings through sound waves.

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If tangential speed is 29.7 km/s, the orbital radius of Earth is approximately 1.49 x 10¹¹ meters.

The motion of Earth around the Sun can be described as circular motion, where the gravitational force of the Sun acts as the centripetal force. In this scenario, we are given the tangential speed of Earth and the centripetal acceleration acting on Earth, and we need to determine the orbital radius of Earth.

The formula for centripetal acceleration is:

a = v²/r

Where a is the centripetal acceleration, v is the tangential velocity, and r is the orbital radius.

We are given that the tangential speed of Earth is 29.7 km/s, which is equivalent to 29,700 m/s. We are also given that the centripetal acceleration acting on Earth is 5.9 x 10⁻³ m/s².

Plugging in the values, we get:

5.9 x 10⁻³ m/s² = (29,700 m/s)² / r

Solving for r, we get:

r = (29,700 m/s)² / (5.9 x 10⁻³ m/s²)

r = 1.49 x 10¹¹ meters

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Surprise is the facial expressions is recognized by people of all cultures.

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More information is needed to provide a specific answer. Please provide additional context or data related to the initial velocity of the baseball.

To find the initial velocity of the baseball, we can use the kinematic equations of motion. Since the baseball is thrown at an angle, we need to break down the initial velocity into its x, y, and z components. We know that the initial height of the baseball is 1.8 meters, and the time it takes to reach its maximum height is 1.0 seconds. From this, we can calculate the vertical component of the initial velocity using the equation vf = vi + gt, where vf = 0 m/s, vi is the initial velocity, g is the acceleration due to gravity \((-9.8 m/s^2\)), and t is the time.

Solving for vi, we get vi = 9.8 m/s.

To find the horizontal component of the initial velocity, we can use the equation\(x = vit + 1/2at^2\), where x is the distance travelled in the x-direction (which is 18 meters), vi is the initial velocity in the x-direction, a is the acceleration in the x-direction (which is 0 m/s^2 since there is no horizontal force acting on the ball), and t is the time of flight (which we can calculate using the time it takes for the ball to reach its maximum height). Solving for vi, we get vi = x/t = 18/2.0 = 9.0 m/s. So the initial velocity of the baseball can be expressed as <9.0, 9.8, 0> m/s, where the x-component is 9.0 m/s (to the right), the y-component is 9.8 m/s (upward), and the z-component is 0 m/s (since there is no initial velocity in the z-direction).

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The electric flux through the pyramid is approximately 37.29 N·m²/C.

To calculate the electric flux through the pyramid, we need to determine the net electric charge enclosed by the pyramid.

The electric flux is given by the equation Φ = q/ε₀, where Φ represents the electric flux, q is the net electric charge enclosed, and ε₀ is the electric constant.

In this case, we have a sphere with a charge of -0.2 x \(10^{(-9)}\) C and a cube with a charge of 0.53 x \(10^{(-9)}\) C inside the pyramid. The net charge enclosed is the sum of the charges of the sphere and the cube: -0.2 x \(10^{(-9)}\) C + 0.53 x \(10^{(-9)}\) C = 0.33 x \(10^{(-9)}\) C.

Now we can calculate the electric flux using the equation Φ = q/ε₀. The electric constant, ε₀, is a known value (approximately 8.85 x \(10^{(-12)}\) C²/N·m²). Plugging in the values, we get Φ = (0.33 x \(10^{(-9)}\) C) / (8.85 x \(10^{(-12)}\) C²/N·m²).

Simplifying the expression, we find Φ ≈ 37.29 N·m²/C.

Therefore, the electric flux through the pyramid is approximately 37.29 N·m²/C.

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Answer:

Displacement = 7 meters

Explanation:

Given that,

Jaune moves North 15 meters, South 5 meters, then North 8 meters. We need to find the displacement of Jaune.

The attached figure shows the motion of Jaune.

We know that, Displacement = final position - initial position

Initially, Jaune traveled 15 meters due North and finally, he travel 8 meters North.

Displcement = 15 m - 8 m

Displacement = 7 m

So, the displacement of Jaune is 7 meters.

Answer:

Oppenheimer suggested that the bomb laboratory operate secretly in an isolated area but allow free exchange of ideas among the scientists on the staff.

Explanation:

Answer: We don't have enough information to find the individual diameters, only their difference. But we can conclude that the difference in diameters between the two spheres is 7.1 mm

Explanation:

A capacitor is a device used to store electrical charge. It consists of two conductive plates separated by a gap, called the dielectric. In the case of a spherical capacitor, the plates are two concentric spheres, with a gap between them. The capacitance of the capacitor is a measure of its ability to store charge, and is given by the following expression:

C = 4πε₀r₁r₂ / (r₂ - r₁)

where C is the capacitance,

r₁ is the radius of the inner sphere,

r₂ is the radius of the outer sphere,

and ε₀ is the permittivity of free space (a physical constant).

To solve the problem, we are given that a spherical capacitor with a 1.0 mm gap between the shells has a capacitance of 100 pf. We can use this information and the expression for capacitance to find the radii of the two spheres.

First, we need to convert the gap between the shells from millimeters to meters, since the equation requires the radius in meters. 1.0 mm is equal to 0.001 m.

Next, we can rearrange the capacitance equation to solve for r₂ - r₁:

r₂ - r₁ = 4πε₀r₁r₂ / C

Now we can substitute the given values and solve for r₂ - r₁:

0.001 m = 4π(8.85 x 10^-12 F/m)(r₁)(r₂) / 100 x 10^-12 F

r₂ - r₁ = 0.00355 m

Finally, we can use the relationship between the radii and the diameters of the spheres to find the diameters:

D₁ = 2r₁ and D₂ = 2r₂

Substituting the value of r₂ - r₁, we get:

D₂ - D₁ = 0.0071 m

We don't have enough information to find the individual diameters, only their difference. But we can conclude that the difference in diameters between the two spheres is 7.1 mm

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Answer:

Dietary carbohydrates provide the body with energy for tough workouts and replenish energy stores in muscles in the form of glycogen.

Explanation:

Answer: velocity

Explanation: Acceleration = change in velocity / time interval

5m/s to 25 m/s, in 2 seconds. So 25m/s - 5 m/s, then divide by time =

10m/s squared

Explanation:

Assuming that the person is the only force applying work to the box, the total work done by the person is 993.4 J. This is calculated by multiplying the force of gravity (98.1 N) with the vertical distance (1.40 m) to obtain 137.4 J, and then adding the work done in carrying the box horizontally (8.00 m × 98.1 N = 756.8 J). Therefore, the total work done is 137.4 J + 756.8 J = 993.4 J.

Answer:

Newton's first law

Explanation:

you see, when an object is in motion, it tends to stay in motion, but in your case, if a object is at rest, it usually stays at rest unless acted upon my an unbalanced force which is pulling card from under the coin extremely quick and because you pulled it extremely quick, the coin isn't light enough to be moved easily with the paper, nor enough friction and speed for the coin to continue sticking onto the piece of paper

A.K.A. the coin is heavy, which is why it did not move with the paper

Answer:

Newton's First Law - Law of Inertia

Explanation:

Newton's First Law, the Law of Inertia mentions that an object at rest will stay in rest until acted by another force. The penny's inertia will cause it to fall directly down into the cup because the magnitude of external force applied by the card will be too meager to have a notable effect.

Answer:

Explanation:

Now

Look at it this way. This box is in equilibrium... Meaning forces around balanced out.

Now...

The Earth's pull on it is 98N

What Minimum external forces is needed to pick this up....

Now... The Minimum Force is 98N

Why?

Since This Box is under the influence of gravity...

Gravity is acting as a resistance

If you apply a force less than 98N... Let's say 50N on this box... It won't budge because your applied force is less than the resisting force on it(98N).

So We need a force ≥98. So the least force is 98N. Nothing below this will move the Box

Answer 98N.

Answer:

See image

Explanation:

Plato

The average angular speed of the 2.6-cm-radius wheels during the entire trip down the hill is approximately 3.82 rad/s.


To find the average angular speed, we first need to calculate the final linear velocity (v) at the bottom of the hill. We can use the equation v^2 = u^2 + 2as, where u is the initial velocity (1.8 m/s), a is acceleration (0.35 m/s²), and s is the distance (85 m). Solving for v, we get v ≈ 7.33 m/s.

Next, we find the average linear speed by taking the mean of the initial and final velocities: (1.8 + 7.33)/2 ≈ 4.565 m/s.

Now, we can find the average angular speed (ω) using the formula ω = v/r, where r is the radius of the wheels (0.026 m). Therefore, ω ≈ 4.565 / 0.026 ≈ 3.82 rad/s.

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Answer:

A.) Carbon

Explanation:

Carbon is an element on the periodic table.

it has the symbol C, and is found in almost every single thing!

Answer:

Carbon

Explanation:

Ig

With low-frequency stimulation, the muscle relaxes fully between contractions, resulting in identical twitches twitches per stimulus.

Alpha motor neurons are the motor neurons that innervate the fibers of the skeletal muscle. A number of branches, each innervating a different muscle fiber, are formed as the alpha motor neuron enters the muscle. A motor unit is made up of one alpha motor neuron and all of the muscle fibers it innervates. Small motor units with 3-5 muscle fibers per motor neuron are found in muscles that are involved in delicate, coordinated control. Our hand and eye muscles, as well as those that control eye movement, have very small motor units.

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