A student is viewing a specimen under the microscope at a total magnification of 400x. If the oculars of the microscope are 10x, what is the magnification of the objective lens in use

13.0 m/s   that's how fast he was going

Answer:

84% efficiency

Explanation:

21000/25000*100

Explanation:

In a parallel circuit, each lamp is connected to the power source independently, meaning that the lamps are not directly connected to each other. Therefore, if one lamp filament breaks in this setup, the other three lamps will continue to work unaffected.

When the filament of one lamp breaks, it essentially opens the circuit for that particular lamp. However, the remaining lamps are still connected in parallel, so the current can flow through them independently. The other lamps will continue to receive electricity from the power source and light up normally.

This behavior is a characteristic of parallel circuits, where each component has its own individual connection to the power source. If the lamps were connected in series, the situation would be different. In a series circuit, a break in one lamp's filament would interrupt the flow of current throughout the entire circuit, and all the lamps would go out.

Answer:

A . static frictional force

B. kinectic friction

C.. Rolling friction

14.56 moles of gas occupy 200 liters at a pressure of 2.8 atmospheres and a temperature of 292 K.

The ideal gas law is a fundamental equation in thermodynamics that describes the behavior of ideal gases. It relates the pressure (P), volume (V), number of moles (n), and temperature (T) of a gas.

To determine the number of moles of gas occupying a given volume, pressure, and temperature, we can use the ideal gas law equation:

                                      PV = nRT

Where:

P = Pressure (in atmospheres)

V = Volume (in liters)

n = Number of moles

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature (in Kelvin)

Rearranging the equation to solve for the number of moles (n), we have:

n = PV / RT

Now, let's calculate the number of moles:

P = 2.8 atmospheres

V = 200 liters

R = 0.0821 L·atm/(mol·K)

T = 292 K

n = (2.8 atm * 200 L) / (0.0821 L·atm/(mol·K) * 292 K)

Simplifying the equation:

n = 14.56 moles

Therefore, approximately 14.56 moles of gas occupy 200 liters at a pressure of 2.8 atmospheres and a temperature of 292 K.

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approximately 22.86 moles of gas occupy a volume of 200 L at a pressure of 2.8 atmospheres and a temperature of 292 K.

The ideal gas law equation relates the pressure, volume, temperature, and number of moles of a gas. It is given by:

PV = nRT

Where:

P is the pressure of the gas,

V is the volume of the gas,

n is the number of moles of the gas,

R is the ideal gas constant, and

T is the temperature of the gas in Kelvin.

To find the number of moles, we rearrange the equation as:

n = PV / RT

Substituting the given values into the equation:

n = (2.8 atm) * (200 L) / [(0.0821 L·atm/mol·K) * (292 K)]

n ≈ 22.86 moles

Therefore, approximately 22.86 moles of gas occupy a volume of 200 L at a pressure of 2.8 atmospheres and a temperature of 292 K.

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Answer:

C: Net Torque divided by Moment of Inertia

Explanation:

Torque = Moment of Inertia x Angular Acceleration.

According to Newton's second law for rotational motion, an object's angular acceleration equals the net torque multiplied by the moment of inertia, not divided by it. The correct answer is (A)

Mathematically, it can be expressed as:

Angular acceleration (α) = (Net torque (τ) / Moment of inertia (I))

Where:

α = angular acceleration (measured in rad/s²)

τ = net torque (measured in Nm or kgm²/s²)

I = moment of inertia (measured in kgm²)

This equation shows that the angular acceleration of an object is equal to the net torque applied to it divided by its moment of inertia. So, the correct answer is (A) net torque multiplied by the moment of inertia.

To summarize, Newton's second law for rotational motion states that the angular acceleration of an object is directly proportional to the net torque applied to it and inversely proportional to its moment of inertia. The moment of inertia represents an object's resistance to changes in its rotational motion, while the net torque represents the total rotational force acting on the object.

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Answer:

At point A. it gets kinda loud then at point B. it gets very loud than at point C. it gets quieter than at point D. it gets more silent.

Explanation:

Because you can tell when the waves get large it gets louder and then when the waves get more far apart then it get more quiet. Hope this helped!

The weight of an object is the least at a height of 2000 miles above the earth's surface

Weight of an object is the force with which the object is attracted towards the center of the earth due to gravity. The weight of an object changes due to the variation of acceleration due to gravity at different locations on earth. At places where the acceleration due to gravity is low, the weight of an object is the least. Hence, at 2000 miles above Earth's surface, the weight of an object would be the least. Acceleration due to gravity, g, is the force per unit mass acting on a body as a result of gravity. It decreases as we move farther away from the Earth's surface. It is because as the distance increases, the gravitational pull decreases. Thus, the weight of an object will be the least when it is farthest from the Earth's surface. Therefore, the weight of an object will be the least at 2000 miles above Earth's surface. At the equator and the poles, the centrifugal force of the earth's rotation is maximum and minimum, respectively. But the difference is negligible, and therefore the effect on the weight of the object is negligible. Hence, the weight of an object is the least at a height of 2000 miles above the earth's surface.

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Franz Mesmer’s claims about his mesmerism abilities eventually led to his downfall that he could mesmerize and magnetize trees.

Franz Anton Mesmer was a German physician who was the father of modern hypnotism. He was born in Iznang, Swabia (Germany) on May 23, 1734, and passed away in Meersburg, Swabia, on March 5, 1815.

Mesmer swiftly amassed fame, money, and a large following of patients because he had a sincere belief in his capacity to manage his invisible fluid. He designed the baquet, a shallow wooden tub that could accommodate thirty patients at once and included magnetised water and iron bars.

As a result, when ebullient Austrian physician Franz Anton Mesmer claimed to have discovered another another invisible energy that, in his words, flowed through every living thing and was the root of and treatment for every bodily condition.

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Answer:

The goals of human development are varied and complex, but they generally involve improving the well-being and opportunities for individuals and communities. Here are some of the main goals of human development:

1. Enhancing individual capabilities: This goal involves ensuring that individuals have access to the resources and opportunities they need to develop their full potential and lead fulfilling lives. This includes access to education, healthcare, and basic necessities such as food, water, and shelter.

2. Promoting economic development and growth: This goal involves creating conditions that support economic growth and development, including creating jobs, encouraging entrepreneurship, and promoting trade and investment.

3. Advancing social justice and equity: This goal involves ensuring that all individuals have equal access to opportunities and resources, regardless of their background or circumstances. This includes promoting gender equality, reducing inequality, and addressing discrimination and social exclusion.

4. Protecting the environment: This goal involves promoting sustainable development practices that protect the environment and prevent environmental degradation. This includes addressing climate change, reducing pollution, and protecting natural resources.

5. Fostering peaceful and inclusive societies: This goal involves creating conditions that support peaceful and inclusive societies, including promoting human rights, reducing conflict and violence, and fostering social cohesion.

These goals are interrelated and often require a comprehensive and integrated approach to achieve. Human development efforts can involve a wide range of stakeholders, including governments, civil society organizations, businesses, and individuals, and may require cooperation and collaboration across sectors and disciplines.

Explanation:

Answer:

13=c

14=a

other question=d

Given :

Intensity, I = 1.34 kW/m².

Area, A = 3.28 m².

To Find :

Time taken to arrive.

Solution :

Power is given by :

P = I × A

P = 1.34 × 3.28 × 1000 W

P = 4395.2  W

Also, power is given by :

P = E/t

t = E/P

t = 1.73 × 10⁹ J/4395.2 W

t = 393611 s

Converting this time in second to days, we get :

t = 393611/( 24×60×60) days

t = 4.55 days.

Hence, this is the required solution.

Answer:

a = 2.44 m/s²

Explanation:

The Net force acting on the car downwards the plane will be equal to the component of the weight that is parallel to the plane.

Thus;

mg(sin θ) = ma

Thus;. g(sin θ) = a

g is acceleration due to gravity = 9.81 m/s²

θ = 14.4°

Thus;

9.81 × sin 14.4 = a

a = 2.44 m/s²

Answer:

2.44

Explanation:

If your on Acellus the correct answer is 2.44

At a distance of 1.5 centimeters from the solenoid axis, the maximum electric field strength is 0.942 V/m.

it is given that,

d; Diameter = 4 cm = 0.04 m

r; Radius = d/2 = 0.04/2 = 0.02 m

magnetic field varies sinusoidally between 8T and 12 T.

f; Frequency  = 10 Hz

The electric field is defined according to Faraday's law:

E = -(r/2)(dB/dt)

The magnetic field's equation can be written as follows from its variation:

B(t) = \(B_c + B_o*sin\) (2πft)

B(t) = 10 + 2sin (2π * 10t)

Thus;

dB/dt = 40π cos 20πt

When cos 20πt equals -1, the electric field will reach its maximum value. Thus;

We therefore have\((dB/dt)_{max}\) = -40 at r = 1.5 cm = 0.015 m from the solenoid axis;

E = -(0.015/2) × -40π

E = 0.942 V/m

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The work done by the crane on the load is positive. As the load was initially at rest, the crane had to apply a force greater than the weight of the load to lift it up against gravity. This means that the crane did work on the load by transferring energy to it in the form of gravitational potential energy.

The work done is equal to the product of the force applied by the crane and the distance over which the force was applied.

Once the load reaches the top of the tower, the work done on the load is zero. This is because the load is no longer moving and is not experiencing any change in potential energy or kinetic energy. The crane is also not applying any force on the load at this point.

As the crane gently sets the load down, the work done on the load is negative. The crane is applying a force that is less than the weight of the load, and the load is moving in the opposite direction to its initial motion. This means that the crane is transferring energy out of the load, resulting in a decrease in the load's potential energy. The work done is equal to the product of the force applied by the crane and the distance over which the force was applied, which is in the opposite direction to the direction of motion.

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No, the elastic potential energy stored in the pole of a pole vaulter is not the only type of potential energy involved in pole-vaulting.

In pole-vaulting, there are multiple forms of potential energy involved. While the elastic potential energy stored in the pole plays a crucial role, other forms of potential energy include gravitational potential energy and kinetic energy.

1. Elastic Potential Energy: The pole used in pole-vaulting is typically made of flexible materials, such as fiberglass or carbon fiber, which store elastic potential energy when bent or compressed. This stored energy is then released, propelling the vaulter upwards.

2. Gravitational Potential Energy: As the vaulter reaches the highest point of their vault, they have gained gravitational potential energy due to their increased height above the ground. This potential energy is converted into other forms of energy as the vaulter descends.

3. Kinetic Energy: Throughout the vaulting process, the vaulter's body also possesses kinetic energy, which is the energy of motion. The vaulter's initial speed and subsequent acceleration contribute to their kinetic energy, allowing them to gain momentum and clear the bar.

Therefore, while the elastic potential energy stored in the pole is an important component, there are other forms of potential energy involved in pole-vaulting, namely gravitational potential energy and kinetic energy.

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False.

The momentum is always conserved in a collision.

From the law of conservation of momentum, the total momentum of a system before the collision is equal to the total momentum of the system after the collision.

Thus, the given statement is false.

Answer:

I would like to attach options to the question above for clarity.

Jasmine is investigating the effect force has on the motion of an object. She predicts if she puts a strong force on pushing a bowling ball, it will travel a farther distance than when a weak force is applied. Is her prediction correct?

A. No, a weak or a strong force applied to the ball is unable to affect the motion of the ball.

B. No, the force applied to the bowling ball should be a strong force.

C. Yes, the force applied to the bowling ball affects the motion of the ball.

D. Yes, the ball will travel a longer distance when a weak force is applied.

The correct option is C (Yes, the force applied to the bowling ball affects the motion of the ball).

Explanation:

First, a force is any effort either push or pull that causes an object to undergo a change.

A bowling ball can remain at rest or in motion except a force acts on it. This brings us to the question above, the mass which affects force is not mentioned which means it is uniform or negligible. Recall that force = mass X acceleration. So the greater the force that is applied to the bowling ball the further distance it will travel. From the question, she applied a forward force (pushing), so the more force she applies the further the bowling ball will travel.

The rock, when thrown horizontally with a speed of 16 m/s from the top of a 48 m cliff, would hit the flat plain below at a horizontal distance of approximately 32 meters.

When the rock is thrown horizontally, it only experiences horizontal motion and does not have any vertical component of velocity. This means that its initial vertical velocity is zero. Due to the absence of air resistance, the only force acting on the rock in the horizontal direction is its initial horizontal velocity.

Since the rock is falling vertically due to gravity while moving horizontally with a constant speed, it follows a projectile motion trajectory. The time it takes for the rock to reach the ground is determined solely by the vertical motion and is given by the equation t = \(\sqrt{(2h/g)\), where h is the initial vertical height (48 m) and g is the acceleration due to gravity (9.8 m/s²).

Using this time value, we can calculate the horizontal distance traveled by the rock using the equation d = \(v*t\), where v is the initial horizontal velocity (16 m/s) and t is the time of flight. Plugging in the values, we find that the horizontal distance is approximately 32 meters.

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The energy transfered to the surroundings from the water of mass 0.5 kg is  46200 J.

Energy is the ability of the capacity to perform work. The s.i unit of energy is Joules (J).

To calculate the energy transferred to the surroundings from the water, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the energy transfered to the surroundings from the water is  46200 J.

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Answer:

The pressure remains the same.

F = P * A  the amount of force transmitted would double if only the input area is changed. Pressure is the same at all points in the system.

ANSWER:

500 J

STEP-BY-STEP EXPLANATION:

Given:

Mass of object = 10 kg

Speed = 10 m/s

The kinetic energy is calculated using the following formula:

The kinetic energy is 500 J.

Answer:

(a) h = 5.1 m

(b) v = 14.13 m/s

Explanation:

(a)

We will use the law of conservation of energy. For this situation it states that:

Loss in Potential Energy of Sphere = Gain in Kinetic Energy of the Sphere

mgh = (1/2)mv²

h = v²/2g   --------------- equation (1)

where,

h = height = ?

v = speed at lowest point = 10 m/s

g = 9.8 m/s²

Therefore,

h = (10 m/s)²/(2)(9.8 m/s²)

h = 5.1 m

(b)

using the equation (1)

h = v²/2g

v = √2gh

where,

v = velocity = ?

g = 9.8 m/s²

h = height = 2(5.1 m) = 10.2 m

Therefore,

v = √[2(9.8 m/s²)(10.2 m)]

v = 14.13 m/s

The height from which the sphere was released is 5.1 m

When the height is doubled, the speed of the sphere becomes 14.14 m/s.

The given parameters:

The height from which the sphere was released is calculated as follows;

\(P.E = K.E\\\\mgh = \frac{1}{2}mv^2\\\\gh = \frac{1}{2}v^2\\\\h = \frac{v^2}{2g}\\\\h = \frac{(10)^2}{2(9.8)} \\\\h = 5.1 \ m\)

When the height is doubled, the speed of the sphere becomes;

\(h = \frac{v^2}{2g} \\\\v^2 = 2gh\\\\v = \sqrt{2gh} \\\\v = \sqrt{2 \times 9.8 \times (2 \times 5.1)} \\\\v = 14.14 \ m/s\)

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Answer:

3.2

Explanation:

I remember taking this quiz and I think that one is correct

B that is the correct answer

Answer:

3d shape is the shape of solid

Answer:

steam is a gas

Explanation:

Answer: Steam is an invisible gas, unlike water vapor, which appears as a mist or fog.

Explanation:

Answer: There are five principles of fitness out of which two are overload principle and rest and recovery principle. Overload principle is one of the most important principle which tell that to gain and improve the fitness one should do the hard work.  

Slowly and gradually the intensity and time of exercise are increased so that our body can adapt to the hard work. Overload principle plays an important role in improving the skills and improving performance during exercise and sports.

Rest and recovery principle is important to relax the body and release the stress that happens due to intense training like in case of weight lifting one day rest should be taken to repair and rebuild the muscles. This allows the body to encounter the fatigue and improve performance.

Explanation: