A toddler pushes his 7.0 kg toy box at a relatively constant velocity across the tiled floor of the family room applying a horizontal force of 35 N. Calculate the magnitude of the normal force.

Centripetal force on the end of a 66.0 m (radius) wind turbine blade that is rotating is calculated as = 1.23 *10^-4 N.

Centripetal force is the force acting on the object in curvilinear motion directed towards axis of rotation or the center of curvature and the unit of centripetal force is newton. It is directed perpendicular to the direction of the displacement of the object.

Given, radius= 66m mass is 3.4 kg

Given 0.47 rev/s

Angular velocity = 0.47 * 2π / 60

= 0.049 m/s

Centripetal force = mass * velocity²/radius

= 3.4 *  0.049² /66

Centripetal force= 1.23 *10^-4 N

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Answer:

A comet

Explanation:

The picture is of an elliptical orbit of a comet. You can tell it is a comet because of the tail. Also, I just took the test and it was a comet.

Answer:

I think it's A C and D sry if I'm wrong UwU

The extension of the spring is 4.83 m, if work done is 35 Newton and spring constant is 3 k N/m.

The spring constant, k, is a measure of the stiffness of the spring. it's far one of a kind for unique springs and materials. the larger the spring regular, the stiffer the spring and the greater.

Spring constant of 3 k N/m,

The amount of work done in extending is 35 N

WORK DONE by spring force = 1/2 k X²

                                                 ⇒0.5 * 3 * X²

                                   35 N = 0.5 * 3 * X²

                                 X² = 35/1.5

                                  x = \(\sqrt{23.33}\)

                                     X = 4.83 m

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The extension of the spring is can be found out by using the Work Done due to extension in Spring Constant K. The extension in the spring is 4.83m.

The spring constant, k, is a measure of the stiffness of the spring. It is for springs and materials which measures the ratio of force that affects the spring and the displacement caused by the force action.

Spring constant depends on the stiffness of the spring, wire thickness, number of turns in wound coil, length of spring and diameter of the coil.

Given:

Spring constant = 3000 N/m

Work Done in extension= 35 N

Let the extension in spring by x.

∴ Work Done by spring force = 1/2 kx²

                        Work done   = 0.5 × 3 × x²

    ⇒                                 35 N = 0.5 × 3 × x²

    ⇒                                      x² = 35/1.5

     ⇒                                         x = 4.83m

Hence, the extension of spring is 4.83m.

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The correct answer is D. Tightly packed particles in solids slow down the light  waves; however, sound waves make particles bounce  into each other, so they travel faster in solids.

Explanation:

The experiment compares the speed of light and sound in different mediums (gas, liquid, and solid). The charts show sound travels faster in a solid medium (ice) than in liquids or gases as the speed in ice was 3200 m/s, while in the liquid was 1500 m/s and in the gas was 346 m/s. Thus, sound waves travel faster in solids, which occurs because for sound to travel particles need to bounce or vibrate, which occurs faster in solids as particles are packed together.

On the other hand, the data about light shows this travels faster in gases (air) because in this medium the speed of light is \(2.99 x 10^{8}\), while in a solid the speed is \(1.91 x 10^{8}\). This shows opposite to sound, light travels faster in gases, and therefore, the tightly packed particles of soil only slow down light waves.

Answer:

d is correct on edge 2020

Answer: 90 Km

Explanation:

15 Km/hr X 6/hr = 90Km

The coefficient of kinetic friction for a 2-kg block initially at rest that slides down an inclined plane with constant velocity with an angle of incline of 35° is 0.5 (answer option b).

The forces acting on the 2-kg block that slides down an inclined plane with constant velocity include the force of gravity and the force of kinetic friction. Since the block is moving with constant velocity, it is experiencing a net force of zero. Hence, the force of kinetic friction must be equal in magnitude and opposite in direction to the force of gravity, which is given by:

Force of gravity = mg where m is the mass of the block and g is the acceleration due to gravity. Thus, the force of kinetic friction is also mg, directed up the inclined plane. In addition, there is also a component of the weight of the block that is directed down the plane. This component is given by:

mg sin θwhere θ is the angle of incline.

Since the block is moving with constant velocity, the force of kinetic friction must be equal in magnitude to this component of the weight, that is: mg sin θ = μkmg where μk is the coefficient of kinetic friction. Cancelling out the mass and simplifying, we get:μk = sin θ= sin 35° ≈ 0.57.

Hence, the coefficient of kinetic friction is approximately 0.57, which is closest to option b) 0.5.

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The minimum value of the coefficient of static friction between the surface and the stationary block is 0.87.

The coefficient of static friction is equal to the tangent of the angle at which the objects slide.

Mathematically,

where;

Since the block is stationary, the minimum value of the coefficient of static friction will be:

μs = tan(41°)

μs = 0.87

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The force required to start the given box in motion is 39.2 N.

The given parameters;

The force required to start the box in motion must be greater or equal to static frictional force.

The magnitude of the force is calculated as follows;

\(F = \mu_s F_n\\\\F = \mu_s mg\\\\F = (0.4) \times (10) \times (9.8)\\\\ F = 39.2 \ N\)

Thus, the force required to start the box in motion is 39.2 N.

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Answer:

Explanation:

uk=0.3

us==00.4

f=10

ground acceleration =9.8

f=10×0.4×9.8=39.2

It's important to note that the force acting on the current loop is perpendicular to both the magnetic field and the direction of the electric current flowing through the loop, in accordance with the right-hand rule.

In order for the electric current  loop to be used as an electric motor, a force must be applied to it. This force can be generated by changing the magnetic field that the current loop is located in. By varying the strength and direction of the magnetic field, the normal vector of the current loop will also change, causing the loop to rotate. This rotation can then be used to perform work and turn the current loop into an electric motor.

According to the question, the wire loop shrinks to half its original diameter, which means fewer electric field lines will pass through the loop. This change in magnetic flux causes current to flow in the wire loop, and according to Lenz's law, this current will flow in the opposite direction of that which produced it, which is the change in magnetic flux, so the current will flow anticlockwise.  

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Based on the given plot of only the 8 planets, the comparison that is best is option B - the inner planets are low in mass, while the outer planets are high in mass.

This is because the four inner planets (Mercury, Venus, Earth, and Mars) are much smaller in size and have a lower mass compared to the four outer planets (Jupiter, Saturn, Uranus, and Neptune), which are much larger and have a significantly higher mass, this is due to the way the planets formed in our solar system. The inner planets formed closer to the Sun where the heat and radiation prevented lighter elements like hydrogen and helium from accumulating.

Therefore, the inner planets are primarily made of heavier elements like rock and metal, which give them a smaller size and lower mass. On the other hand, the outer planets formed farther from the Sun where lighter elements like hydrogen and helium could accumulate and form gas giants, making them much larger and heavier. Overall, option B is the best comparison as it accurately reflects the mass differences between the inner and outer planets observed in our solar system.

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Gravitational force is the force of attraction that exists between any two objects in the universe that have mass.

(a) The work done by the hand-driven tire pump in one stroke can be calculated using the formula W = Fd, where F is the force applied, and d is the distance moved. Since the piston has a diameter of 2.50 cm, its radius is 1.25 cm or 0.0125 m. The cross-sectional area of the piston is πr^2, which is approximately 0.00049 m^2. Therefore, the force exerted on the piston can be calculated as F = PA, where P is the pressure and A is the area of the piston. Substituting the given values, we get F = 2.40×10^5 N/m^2 × 0.00049 m^2 = 117.6 N. The distance moved by the piston is 30.0 cm or 0.3 m. Therefore, the work done by the pump is W = Fd = 117.6 N × 0.3 m = 35.28 J.

(b) Neglecting friction and gravitational force, the average force exerted on the piston can be calculated as the average pressure multiplied by the area of the piston. Therefore, the average force is F = PA = 2.40×10^5 N/m^2 × 0.00049 m^2 = 117.6 N, which is the same as the force calculated in part (a).

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Answer:

that is true

Explanation:

Answer:

True.

Explanation:

Energy can be given off by heat, a lot of heat can be a sign of a lot of energy. And a shorter wavelength the more energy, which I've learned in school.

Answer:

H= Mass × specific heat capacity ×change in temperature

= 2×380×(10-0)

=2×380×10

=7600 Joules

Answer:

Sunspots are places where the strong magnetic fields in the Sun resist the upward motion of bubbling hot gases from underneath

Explanation:

Answer:

The beat frequency is 30 Hz

Explanation:

Given;

velocity of the two sound waves, v = 343 m/s

wavelength of the first wave, λ₁ = 5.72 m

wavelength of the second wave, λ₂ = 11.44 m

The frequency of the first wave is calculated as follows;

F₁ = v/λ₁

F₁ = 343 / 5.72

F₁ = 59.97 HZ

The frequency of the second wave is calculated as follows;

F₂ = v/λ₂

F₂ = 343 / 11.44

F₂ = 29.98 Hz

The beat frequency is calculated as;

Fb = F₁ - F₂

Fb =  59.97 HZ - 29.98 Hz

Fb = 30 Hz

Answer:

1. The ice molecules are at a temperature of 0°C;

2. The ice molecules are absorbing latent heat which would result in their turning to liquid water. Therefore, melting or fusion is occurring.

Note: The question did not provide any options to choose from.

Explanation:

The process of change of state occurs when heat is added or removed from a substance. For example, solid may change to a liquid when heat is added to it whereas a liquid may change to liquid when heat is removed from it.

During the process of change of state, the temperature of the substance undergoing a change of state does not change throughout the time it is undergoing the change. The temperature will begin to increase or decrease when all the molecules of the substance has undergone a change of state. The heat supplied to or removed from a substance during a change of state is known as latent heat.

When a solid changes to liquid, it is known as fusion and the heat absorbed by the solid substance is known as latent heat heat of fusion. If a liquid changes to gas, it is known as vaporization and the heat absorbed by the liquid is known as latent heat of vaporization.

In the experiment by the students above, since the temperature of the ice remains constant at 0°C when heat is supplied from the Bunsen burner to it, the following processes could be occurring:

Answer: B, C, D

Explanation:

trust me

Gravity is a fundamental, universal force that pulls objects toward Earth's center. It increases with mass and decreases with distance. Measured in Newtons, it affects all objects.

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The correct question would be as

Which statement describes gravity? Select three options. There is no defined unit of measurement for gravity.

Gravity is the force that pulls objects toward Earth’s center.

Objects that have a small mass will have no gravitational pull.

Gravitational pull between two objects increases as the mass of one increases.

Gravitational pull decreases when the distance between two objects increases

The true statements are:Jupiter's Great Red Spot is in the southern hemisphere.The fastest wind speed recorded in our solar system is on Neptune.

Among the given statements, only two are true. Jupiter's Great Red Spot, a massive storm, is indeed located in the southern hemisphere of the planet. The Great Red Spot is a prominent feature on Jupiter, visible as a giant swirling storm system. On the other hand, the fastest wind speed recorded in our solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour), is found on Neptune.

The strong winds on Neptune contribute to its dynamic atmosphere and the formation of features like the Great Dark Spot. The remaining statements about Pluto, Saturn's moon Enceladus, and Uranus are not true according to our current understanding.

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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:

For the same reason that you can skate around a curve at constant speed but not with constant velocity.

The DIRECTION you're going is part of your velocity, but it's not part of your speed.

If the DIRECTION changes, that's a change of velocity.

The object doesn't have to change speed to have a different velocity. A change of direction is enough to do it.

And any change of velocity is called acceleration.

The magnitude of the force on the wire is 1.9 × 10⁻⁴ N. The direction of the current is 50° south of the west. 1.9×10 N⁻⁴, out of the Earth's surface is the correct option.

Length of the horizontal wire, L = 3.0 m

Current flowing through the wire, I = 6.0 A

Earth's magnetic field, B = 0.14 × 10⁻⁴ T

Angle made by the current direction with due west = 50° south of westForce on a current-carrying wire due to the Earth's magnetic field is given by the formula:

F = BILsinθ, where

L is the length of the wire, I is the current flowing through it, B is the magnetic field strength at that location and θ is the angle between the current direction and the magnetic field direction

Magnitude of the force on the wire is

F = BILsinθF = (0.14 × 10⁻⁴ T) × (6.0 A) × (3.0 m) × sin 50°F = 1.9 × 10⁻⁴ N

Earth's magnetic field is due north, the direction of the force on the wire is out of the Earth's surface. Therefore, the correct option is 1.9×10 N⁻⁴, out of the Earth's surface.

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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.

Using the moment of inertia, the mass (m) of the sphere is found to be approximately 6.513 kg.

To find the mass of the sphere, we need to use the formulas for torque and rotational motion.

The formula for torque (τ) is given by:

τ = I × α

Where:

τ = Torque

I = Moment of inertia

α = Angular acceleration

The moment of inertia (I) for a solid sphere rotating about its center is given by:

I = (2/5) × m × r²

Where:

m = Mass of the sphere

r = Radius of the sphere

The formula for angular acceleration (α) is:

α = (ω - ω0) / t

Where:

ω = Final angular velocity

ω0 = Initial angular velocity

t = Time

First, we need to find the final angular velocity (ω) using the given information. We know that the sphere rotates through a total of 400 revolutions in 12.0 seconds. One revolution is equal to 2π radians, so the total angular displacement (θ) is:

θ = 400 revolutions × 2π radians/revolution

θ = 800π radians

The time (t) is given as 12.0 seconds. We can now calculate the final angular velocity:

ω = θ / t

ω = (800π radians) / (12.0 s)

ω ≈ 209.4395 rad/s

Since the sphere starts from rest, the initial angular velocity (ω0) is 0 rad/s. Plugging the values into the formula for angular acceleration:

α = (ω - ω0) / t

α = (209.4395 rad/s - 0 rad/s) / (12.0 s)

α ≈ 17.4533 rad/s²

Now, we can use the formula for torque to find the moment of inertia (I):

τ = I × α

30.0 m·N = I × 17.4533 rad/s²

Since the torque (τ) and angular acceleration (α) are given, we can solve for the moment of inertia (I). Rearranging the equation:

I = τ / α

I = 30.0 m·N / 17.4533 rad/s²

I ≈ 1.7204 kg·m²

Finally, we can use the moment of inertia to find the mass (m) of the sphere:

I = (2/5) × m × r²

1.7204 kg·m² = (2/5) × m × (0.8 m)²

Simplifying the equation:

m = (1.7204 kg·m²) / [(2/5) × (0.8 m)²]

m ≈ 6.513 kg

Therefore, the mass of the sphere is approximately 6.513 kg.

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Para hacerlo a m/s un método muy práctico es sólo dividir entre 3.6, por cuestiones de conversiones, lo puedes comprobar.

212 km/hr /3.6 = 58 m/s

Comprobación :

V= d / t

V= 212 m / 18000 seg <---- nota que aquí los segundos son de las 3.1hrs  

V= 58 m/seg

Answer:

Let R1= resistance of 4ohms

R2= resistance of 8ohms

Equivalent resistance R will be

R=R1 + R2

=> 4+8=12ohms

The current through the two resistors will be the same since they are connected in series. Notwithstanding, the voltage will drop to appreciate the change.

Explanation:

The value of current from the 8-ohm resistor is the same as in the 4-ohm resistor which is equal to the 2 Amp.

Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.

When two resistors are connected to the series in that condition the value of current is the same in both the resistors.

While the value of resistance is different in both the different.

Hence the value of current from the 8-ohm resistor is the same as in the 4-ohm resistor which is equal to the 2 Amp.

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The velocity and direction of the 0.7 kg cart when released = 15 m/s to the right.

The law of conservation of momentum explains that if two objects collide, the magnitude of the decrease in momentum on one object will be equal to the magnitude of the increase in momentum on the other object. This means, the total momentum of the system of objects before the collision is always equal to the total momentum of the system of objects after the collision.

The law of conservation of momentum can be written as follows:

m₁v₁ + m₂v₂ = (m₁v₁)' + (m₂v₂)'

We have,

Mass of the first cart = 1.5 kg ⇒m₁

Mass of the second cart = 0.7 ⇒m₂

The velocity of the 1.5 kg cart = 7 m/s ⇒ v₁'

It moves to the left, so it negative ⇒ -7 m/s

The carts initially at rest, so v₁ = v₂ = 0

And,

(m₁ + m₂) v₂ = (m₁v₁)' + (m₂v₂)'

(1.5 + 0.7) (0) = (1.5) (-7) + (0.7) v₂'

0 = (-10.5) + 0.7 v₂'

0.7 v₂' = 10.5

v₂' = 15 m/s

And 15 m/s ⇒ it is positive, the direction is to the right.

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In order for heavier items to accelerate at the same pace as lighter ones, more force is needed. These claims best substantiate the students' assertion. A pupil is researching mass and acceleration.

A force in physics is an effect that has the power to alter an object's motion. A force can cause an object with mass to change its velocity, or accelerate (for example, moving from a condition of rest). Intuitively, a push or a pull can also be used to describe force. A body's mass is a fundamental characteristic. Before the discovery of the atom and the field of particle physics, it was generally thought to be tied to the amount of matter in a physical body. It was discovered that several atoms and elementary particles.

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Answer: a periodic wiggle in time is called a vibration, while a wiggle in space and time is a wave. ... The source of all waves, whether mechanical or electromagnetic, is something that is vibrating.

Explanation: