31. Box A of mass m sits on the floor of an elevator, with box B of mass 2 m on top of it, as shown in the figure above. The elevator is moving upward and slowing down. F_A is the magnitude of the force exerted on box A by box B, F_B is the magnitude of the force exerted on box B by box A, and F_g is the magnitude of the gravitational force exerted on box B. Which of the following ranks the forces in order of increasing magnitude?
(A) F_B=F_A=F_g
(B) (F_B=F_A) (C) F_B<(F_A=F_g)
(D) F_g

The torque required, obtained by finding the product of the moment of inertia and the angular acceleration are as follows;

The torque, τ, that must be applied to the object to give it an angular acceleration of 1.00 rad/s² are;

Part A

Part B

Part C

Angular acceleration is the rate of change of angular velocity with time.

The torque is found from the product of the moment of inertia and the angular acceleration, therefore;

τ = I·α

Where;

τ = The torque

I = The moment of inertia of the mass

α = The angular acceleration

The moment of inertia of a point mass is; I = m·r²

Part A

The mass rotating about the x-axis, m = 9.0 kg

The distance to the point mass, r = 1.0 m

Therefore;

Iₓ = 9.0 kg × (1.0 m)² = 9.0 kg·m²

At α = 1.00 rad/s², we get;

The torque that must be applied to give it an angular acceleration of 1.00 rad/s² if it is rotated about the x-axis is; 9.0 N·m

Part B

If it is rotated about the y-axis, we get;

m = 2.5 kg

r = 2.0 m

[tex]I_y[/tex] = 2.5 kg × (2.0 m)² = 10.0 kg·m²

Part C

The combined moment of inertia of the point masses are therefore;

[tex]I_z[/tex] = (9.0 + 10.0) kg·m² = 19.0 kg·m²

The torque required is therefore;

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Answer:

they will fly

Explanation:

yes flying is fun

The acceleration, net force, and normal force by the car at the top of hill A are 4.5  meter/second² , 3180 N and 3180 N.

The acceleration, net force, and normal force by the car at the top of hill B are 4.17  meter/second² , 3379N and 3379 N.

The acceleration, net force, and normal force by the car at the top of hill C are 4.0  meter/second² , 3480 N and 3480 N.

Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center.

On hill A;

The centripetal acceleration = v²/r = 6²/8 meter/second² = 4.5  meter/second² .

The net force = m(g -a) = 600 (9.8 - 4.5) N = 3180 N.

The  normal force = 3180 N

On hill B;

The centripetal acceleration = v²/r = 5²/6 meter/second² = 4.17 meter/second² .

The net force = m(g -a) = 600 (9.8 - 4.17) N = 3379 N.

The  normal force = 3379 N.

On hill A;

The centripetal acceleration = v²/r = 4²/4 meter/second² = 4.0 meter/second² .

The net force = m(g -a) = 600 (9.8 - 4.0) N = 3480 N.

The  normal force = 3480 N.

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The total angle the tires rotate through during his trip is 8156 radian.

The study of shapes and their measurements falls under the umbrella of geometry, a subfield of mathematics. It also emphasises how the shapes are arranged in relation to one another and their spatial characteristics. We are aware that geometry is divided into 2D and 3D categories.

All geometrical shapes are first created by the intersection of points, lines, rays, and plane surfaces. The distance between the two lines is known as a "Angle" when the two lines or rays converge at a single location.

Given that:

A boy rides his bicycle 2.08 km.

The wheels have radius 25.5 cm.

So, perimeter of the wheel = 2πr = 2π×25.5 cm = 160.22 cm.

Total angle  the tires rotate through during his trip

= ( 2.08 km/ 160.22 cm)× 2π

=  8156 radian.

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The height above the ground in which the vase is raised is 51.02 m.

The height above the ground in which the vase is raised is calculated by applying the formula for gravitational potential energy.

Gravitational potential energy of an object is the energy possessed by the object due to the object's position above the ground.

Mathematically, the formula for gravitational potential energy is given as;

P.E = mgh

where;

The given parameters include;

mass of the vase = 0.2 kg

potential energy of the vase = 100 J

acceleration due to gravity = 9.8 m/s²

h = P.E / mg

h = (100) / (0.2 x 9.8)

h = 51.02 m

Thus, the height of the vase is a function of the potential energy and mass of the vase.

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The complete question is below:

a 0.2 kg vase has a potential energy of 100j. What is the height of the vase?

I'll assume that the properties of the water are that sound waves in fresh water move at a speed of 1497 m/s at a temperature of 25 °C. If the speed is 0.01s, you must divide it by 100 to get 14.97; but, since it travels there and back in 0.01s, you must split it in half i.e 7.485m.

Without a medium, what kind of wave can travel?

Electromagnetic waves

In contrast to mechanical waves, electromagnetic waves can travel without a medium. This implies that electromagnetic waves can pass not only through solid objects like air and rock but also through empty space.

Answer and justification Since electromagnetic waves are not conveyed by the vibration of particles, they do not need a medium to travel. Electric and magnetic fields, which can exist anywhere, oscillate, creating waves. Waves can therefore exist in solids, liquids, gases, or empty space.

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The two column headings describe controlled variable be: pressure and temperature.

Anything kept constant or constrained in a research study is referred to as a control variable. Despite not being relevant to the study's objectives, this variable is controlled because it might have an impact on the results.

Variables can be controlled either directly by maintaining their value throughout a study (for example, by maintaining a constant room temperature in an experiment) or indirectly by using techniques like randomization or statistical control (e.g., to account for participant characteristics like age in statistical tests). Research biases like omitted variable bias can be avoided by including control variables in your analysis.

In the case of Franscisco wants to investigate how changing the shape makes the same amount of ice melt faster or slower when placed in a water bath, the two column headings describe controlled variable be: pressure and temperature.

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The gravitational field strength of the moon at this new distance is gr/4

The gravitational field is the amount of gravitational force that would be applied to a little mass at that location per unit of mass. It is a vector field that is oriented in the mass's expected direction of force.

A gravitational field is the force field that surrounds any mass or collection of masses in space. Although this field spreads out in all directions, the gravitational force becomes weaker the further an object is from the source. This is a method of calculating the gravitational pull. Weight divided by mass equals the strength of the gravitational field. Strength of gravitational field = mass/weight in kilograms, or N/kg.

The complete question is : A satellite of mass m orbits a moon of mass M in uniform circular motion with a constant tangential speed of v.

The gravitational field strength at a distance R from the center of moon is gR. The satellite is moved to a new circular orbit that is 2R from the center of the moon. What is the gravitational field strength of the moon at this new distance?

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The correct statement about dwarf planet locations is :

Ceres is found in the asteroid belt and Eris, Makemake, Haumea, and Pluto are found in the Kuiper Belt.

A dwarf planet is described as a small planetary-mass object that is in direct orbit of the Sun, smaller than any of the eight classical planets but still a world in its own.

There are as of now five formally grouped dwarf planets in our solar system and they include:

Ceres, Pluto, Haumea, Makemake and Eris.

Ceres location is that it is situated inside the asteroid belt between the orbits of Mars and Jupiter, while the other smaller person planets are situated in the external nearby planetary group in, or close to, the Kuiper belt.

Another six articles are in all likelihood predominate planets, yet are sitting tight for official grouping, and there might be upwards of 10,000 diminutive person planets in the solar system.

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Complete question:

Which statement about dwarf planet locations is correct?

Eris is found in the Kuiper Belt and Makemake, Haumea, Ceres, and Pluto are found in the asteroid belt.

Ceres is found in the asteroid belt and Eris, Makemake, Haumea, and Pluto are found in the Kuiper Belt.

Ceres and Pluto are found in the Kuiper Belt and Makemake, Eris, and Haumea are found in the asteroid belt.

Haumea and Makemake are found in the asteroid belt and Pluto, Ceres, and Eris are found in the Kuiper Belt.

The drawing of free body diagram is attached in answer.

The frictional force the field acts on the ball is 1 newton.

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

Given parameters:

Mass of the ball: m = 2 kg.

Acceleration of the ball during slow down: a =   -0.5 m/s².

We have to find:  the frictional force the field acts on the ball: f =?

In this case,   the frictional force the field acts on the ball: f = mass × acceleration = 2 kg × 0.5 m/s² = 1 newton.

Hence, the frictional force the field acts on the ball is 1 newton.

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Answer: B im sorry if its wrong

Explanation:

Answer:

7,229sec

Explanation:

first convert 6km to m and km/h to m/s

1km = 1000m

6km = 6 × 1000m = 6000m

3km/h to m/s

3 × 1000m/ 60min × 60sec = 3000m/3600sec = 0.83m/s

Time=?

distance= average speed/velocity × Time

6000 = 0.83 × t

t=6000/0.83

t= 7,229 sec

or 120min 29sec

Answer:

Explanation:

Given:

F =20 N

D = 60 m

________

W - ?

W = F·D = 20·60 = 1 200 J

The change in the internal energy of the system is  4 kJ.

We know that according to the first law of thermodynamics, energy can neither  be  created nor destroyed but it can be converted from one form to the other.

In this case we know that the internal energy can be obtained by the use of the formula;

ΔE = q + w

ΔE = Change in internal energy

q = Heat absorbed or evolved

w = work done

Where;

q = 9.0 kJ

w = 5.0 kJ

It then follows that;

ΔE = 9 - 5

ΔE = 4 kJ

The gas expands hence the work done is negative.

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The gravitational force on planet X is one-eight (¹/₈) of the magnitude of gravitational force on planet Y.

The gravitational force on each planet is directly proportional to the product of mass of the planet and the tennis ball and inversely proportional to the square of the radius of the planets.

F = GmM/r²

where;

The gravitational force on planet X is written as;

F_X = Gm(mt) / r²

where;

The gravitational force on planet Y is written as;

F_y = G(½m)(mt) / (¼r)²

F_y = ½(Gm(mt) / (¹/₁₆ r²)

F_y = (16 Gm mt)/(2r²)

F_y = 8(G m(mt) ) / r²

F_y = 8(F_X)

F_X = ¹/₈(F_Y)

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Based on the study conducted by Rebecca, the statement that would not be an appropriate hypothesis for Rebecca's experiment is:

A hypothesis is an explanation that is given in the form of a statement to explain an observation based on limited evidence and which serves as a starting point for further investigation.

A hypothesis may or may not be true and must be investigated to prove or disprove it.

Experiments are conducted to prove or disprove a given hypothesis.

A hypothesis is divided into a null and an alternate hypothesis.

A null hypothesis is a hypothesis that state that the treatment given to the subjects of the experiment does not produce any significant effect.

An alternate hypothesis states that the treatment given to the subjects of the experiment produces significant effects on the subjects.

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During the third atmosphere on Earth, the same effect on Earth as it did on Mars. Heat energy was retained while water vapor was condensed.

The third atmosphere on the planet was created by volcanic outgassing and comet ice. This atmosphere had no oxygen, but plenty of carbon dioxide, water vapor, nitrogen gas, and methane gas.

When Earth's crust started to cool 2.5 billion years ago, there was less water vapor in the atmosphere, and more water condensed as liquid, resulting in the formation of Earth's third atmosphere.

This atmosphere was produced by volcanic outgassing, and it was the first to survive on Earth. A planet's atmosphere did not form through accretion while the formation of the planet's star.

Instead, its atmosphere forms as a result of internal volcanic activity or the aggregation of material from comet impacts.

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When an object experiences balanced forces on Earth, it would be at rest (option A).

Balanced forces are those forces that are opposite in direction and equal in size. They are considered as a state of equilibrium. Balanced forces are unable to change the motion or direction of an object i.e. they keep an object moving at a constant velocity. 

When forces are balanced, they cancel each other out, resulting in no change in motion for the object they are acting on. Unbalanced forces do not cancel each other out, and result in a change in motion for the object they are acting on.

The characteristics of balanced forces are as follows:

This suggests that an object on Earth will remain at rest if it experiences balanced forces.

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Answer:

Thread tension:

T = F + P = 9 108 + 21 120 ≈ 30 230 N

Explanation:

Given:

m = 2155 kg

R = 17.5 m

V = 8.6 m/s

g = 9.8 m/s²

_______________

T - ?

Modulus of centripetal force (force is directed towards the center of the circular arc):

[tex]F = \frac{m\cdot V^2}{R} = \frac{2155\cdot 8.6^2}{17.5} = 9108 N[/tex]

Ball weight (directed vertically down):

W = m·g = 2155·9.8 ≈ 21 120 N

Let's use the hint. Thread tension:

T = F + W = 9 108 + 21 120 ≈ 30 230 N

The tension in the cable at the lowest point of the swing is [tex]30248.196 N[/tex].

To determine the tension in the cable at the lowest point of the swing, we can use the hint provided:

[tex]T-mg=\frac{mv^{2}}{r}[/tex]

where T represents tension,

m is the mass of the demolition ball (2155 kg),

g is the acceleration due to gravity (approximately 9.8 m/s^2),

v is the velocity of the ball (8.6 m/s), and

r is the radius of the circular path (17.5 m).

Plugging in the given values, we have:

[tex]T-2155\times 9.81=\frac{2155\times 8.6^{2}}{17.5}[/tex]

[tex]T=30248.196 N[/tex]

Therefore, the tension in the cable at the lowest point of the swing is approximately [tex]30248.196 N[/tex].

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The following describes a change to Earth’s surface due to weathering include the following below:

A. plants creating a crack in a rock formation

B. rocks along the beach being reshaped by wave action.

F. glaciers scraping rocks across the land

This is referred to as the process which involves the breaking down of rocks and minerals on Earths surface as a result of certain factors such as rain, glacier etc. They form cracks when they come in contact with rocks afterf a given period of time before they are disintegrated.

Weathering occurs when plants creating a crack in a rock formation and also when the rocks along the beach are being reshaped by wave action.It also involves the  glaciers scraping rocks across the land which is therefore the reason why option A, B and F was chosen as the correct choice.

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The options are:

A. plants creating a crack in a rock formation

B. rocks along the beach being reshaped by wave action

C. sand being blown to a new location by the wind

D. sediments moved from place to place by a river

E. rain washing soil down a steep hill

F. glaciers scraping rocks across the land

The atom that has been shown is an atom of carbon(C).

We know that in an atom is the smallest particle of a substance that can be able to take part in a chemical reaction. In this case, we have a an atom that have been shown. As expected, the protons that are in the atom have been shown as the circle that is in the innermost part of the image.

The electrons are found around the shells of the atom. The electrons that are in the shells of the atom must be equal to the number of protons that are in the atom of the element.

Given that the number of electrons must be equal to the number of protons and the number of protons gives us the identity of the element that have been shown in the image, we can conclude that this is an atom of carbon.

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Answer:

from high temperature to low temperature areas

Explanation:

If it is correct, could you please give me brainliest? I would really appreciate it! Thank you!

The separation distance in B is two times greater than in A, the force of attraction is greater than A.

Force of attraction is described as a force that pulls the body near due to its attraction. Some of these force of attraction include:

The force of attraction is given by the formula:

Fg = G* m1m2/r2

where

Fg is the force of attraction,

G is the gravitational constant with the value of 6.67 ×10−11 Nm2/kg2,

m1 is the mass of a body,

m2 is the mass of other body.

r is the distance between the two bodies.

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The angle that the rod makes with the horizontal is 9⁰.

The vertical direction of the left spring is determined  by applying the principle of equilibrium force as shown below.

The given parameters;

Apply the principle of equilibrium of force in vertical direction for left spring;

K_L(X_L) = 0.5(W)

65(X_L) = 0.5(11.76)

X_L = 5.88/65

X_L = 0.09 m

Apply the principle of equilibrium of force in vertical direction for right spring;

K_r(X_r) = 0.5(W)

30(X_r) = 0.5(11.76)

X_r = 5.88/30

X_r = 0.196 m

The angle made with the horizontal is calculated as;

θ = arc tan(X_r - X_L) / L

θ = arc tan[(0.196 - 0.09) / 0.67]

θ = arc tan(0.158)

θ = 8.99⁰

θ ≈ 9⁰

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Answer:

where u put it last time or retrace ur steps to where u last put it

Answer:21

Explanation:

it is trust

The person's weight during the entire elevator ride is equal to magnitude  of the normal force exerted by the elevator on the person.

Every day, we experience the typical force. For instance, when a book is placed on a table, the usual response force prevents the book from falling through the table, even though gravity is pulling the book downward. That implies that there is a force acting to push it upward. The word "normal force" refers to the force. Normal in this context refers to being perpendicular to the ground.

The person's apparent weight  during the entire elevator ride is equal to magnitude  of the normal force exerted by the elevator on the person.

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The coefficient of friction is 0.125

The friction coefficient is defined as the ratio of the frictional resistive force to the perpendicular force pushing the objects together. The friction coefficient is represented as, μ = f × N

where is the friction coefficient μ ,

F is the frictional force,

and N is the normal force.

As we know, 2f = W

and f = μ × N

Where, W = weight of tin box

Thus, the co-efficient of friction,

μ = W ÷ 2 N

μ = 100N ÷ (2 × 400 N)

μ = 0.125

Thus, the coefficient of friction is 0.125

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Answer:

In be either B or C ! :))

Explanation:

Ik its not much but hope it helped for now :D