a dull knife is actually more dangerous than a sharp one because it forces you, as the chef, to add more what while cutting? a. fluctuation b. motion c. creativity d. pressure

The sum of the x components of the forces acting on block 2 is expressed as the equation ∑F2x = Tcos(θ) - mgsin(θ).

A force is defined as the effect that causes the motion of an object with mass to change its velocity that is accelerated. It can be a push or a pull, always with magnitude and direction, making it a vector quantity.

The sum of the x components of the forces acting on block 2 is expressed as the equation ∑F2x = Tcos(θ) - mgsin(θ) where the T is the tension, m is the mass of the block, g is the acceleration of gravity, and θ is the angle of the incline.

This type of equation can be used to calculate the x components of the forces in a variety of situations for example, when the block is being pulled up an incline or when it is in equilibrium.

Thus, the sum of the x components of the forces acting on block 2 is expressed as the equation ∑F2x = Tcos(θ) - mgsin(θ).

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Your question is incomplete, most probably the complete question is:

What is ∑F2x, the sum of the x components of the forces acting on block 2? Take forces acting up the incline to be positive. Express your answer in terms of some or all of the variables tension T, m2, the magnitude of the acceleration of gravity g, and θ.

Fahrenheit  =  85.6°F

Celsius  =  (5/9) (Fahrenheit - 32)

Celsius  =  (5/9) (85.6 - 32)

Celsius  =  (5/9) (53.6)

Celsius  =  29.78°C

Kelvin  =  Celsius + 273.15

Kelvin  =  29.78 + 273.15

Kelvin  =  302.93K  

The melting point of a solid is the temperature at which it transforms into a liquid under atmospheric pressure. At this time, both the liquid and solid states coexist peacefully. The Celsius temperature is 29.78°C and that of Kelvin is 302.93K.

The typical definition of the melting point is the temperature at which a substance transforms from a solid to a liquid. The melting point of a liquid is the temperature at which the liquid transforms from a solid to a liquid under atmospheric pressure.

Melting is the process of a solid changing from a solid to a liquid when heated to a specific temperature.

Celsius  =  (5/9) (Fahrenheit - 32)

Celsius  =  (5/9) (85.6 - 32)

Celsius  =  (5/9) (53.6)

Celsius  =  29.78°C

Kelvin  =  Celsius + 273.15

Kelvin  =  29.78 + 273.15

Kelvin  =  302.93K  

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Answer:

I can't see the pic so I cannot ans

The definition of mass is: Mass is a measure of how much matter there is in a substance. So, option (c) is correct.

In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the application of a force.

The change caused by an applied force is smaller the more mass a body has. The kilogram serves as the unit of mass in the International System of Units (SI).

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Answer:

Part One:

Location: A - The arrow from the sun to the tree represents photosynthesis, where carbon dioxide is converted to sugar used for food.

Answer: A

Location: G - The arrow from the factory to the sky represents the release of carbon dioxide from factory emissions, which contributes to the conversion of carbon trapped in fossil fuels to carbon dioxide.

Answer: G

Location: E - The arrow from dead organisms to the ground represents the process where organic carbon is converted to fossil fuels over a long period of time.

Answer: E

Location: D - The arrow from the air to dead organisms represents the conversion of carbon dioxide to carbonates, which can be deposited in the ocean and form rocks over millions of years.

Answer: D

Location: F - The arrow from the cow to the sky represents animal respiration, where sugar is broken down and converted to carbon dioxide.

Answer: F

Part Two:

True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false.

False. The arrow labeled C represents the transfer of chemical energy (carbon dioxide) from the factory emissions to the atmosphere. There is no mechanical energy involved in this process.

True or False. The arrow labeled A represents a transfer of solar energy to chemical energy. Explain why this is true or false.

True. The arrow labeled A represents photosynthesis, where solar energy is used to convert carbon dioxide into chemical energy in the form of sugar.

Which arrow or arrows represent a release of carbon dioxide? What process is occurring at the arrow(s) you selected?

Arrows C and F represent a release of carbon dioxide. Arrow C represents the release of carbon dioxide from factory emissions, while arrow F represents animal respiration where sugar is broken down to release carbon dioxide.

Which arrow or arrows indicate a process that cycles carbon from living or nonliving organisms? Describe the process or processes you selected.

Arrows B, D, and E indicate processes that cycle carbon from living or nonliving organisms. Arrow B represents photosynthesis where carbon dioxide is taken up by plants, arrow D represents the conversion of carbon dioxide to carbonates which can be deposited in the ocean and form rocks over millions of years, and arrow E represents the conversion of dead organisms into fossil fuels over a long period of time.

Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.

All arrows in the diagram demonstrate the conservation of mass and energy. The carbon cycle is a closed system, meaning that the total mass of carbon in the cycle remains constant over time. Energy is also conserved as it is converted from one form to another throughout the cycle.

Coordinates of endpoint K: (5, 15)

To find the coordinates of the other endpoint K, we can use the midpoint formula. The midpoint formula states that the coordinates of the midpoint M between two endpoints J and K can be found by taking the average of the x-coordinates and the average of the y-coordinates.

Given that the midpoint M is (3, 7) and one endpoint J is (1, -1), we can substitute these values into the midpoint formula to find the coordinates of endpoint K.

Let's denote the coordinates of endpoint K as (x, y).

Using the midpoint formula:

x-coordinate of midpoint M = (x-coordinate of J + x-coordinate of K) / 2

3 = (1 + x) / 2

Solving for x:

6 = 1 + x

x = 5

y-coordinate of midpoint M = (y-coordinate of J + y-coordinate of K) / 2

7 = (-1 + y) / 2

Solving for y:

14 = -1 + y

y = 15

Therefore, the coordinates of the other endpoint K are (5, 15).

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The letter that represents energy absorbed to break intermolecular forces is A. Energy D.

It should ben oted that the attracting as the repellent forces that develop between the molecules of a substance  can be regarded as the intermolecular forces (IMF).

It should be noted that these forces operate as a mediator between a substance's individual molecules however the majority of matter's physical and chemical properties are caused by intermolecular forces, hence rom the diagram, the energy D can be seen to absorb the energy.

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Answer: it’s energy A

Explanation:

Answer:

False

Explanation:

Scientific models are not always built to scale and may not be fully accurate

The rms speed of helium atoms at 5.4 K is approximately 1,246 m/s.

The root-mean-square (rms) speed of gas particles is given by the equation:

Vrms = √(3kT/m)

Where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the mass of one particle.

For helium, the atomic mass is 4.003 u, which is equivalent to 6.646 × 10⁻²⁷ kg.

At 5.4 K, the temperature in Kelvin is:

T = 5.4 K = 5.4°C + 273.15 = 278.55 K

Substituting these values into the equation, we get:

Vrms = √(3kT/m) = √(3 x 1.38 x 10⁻²³ J/K x 278.55 K / 6.646 x 10⁻²⁷ kg)

Vrms = 1,246 m/s (rounded to three significant figures)

Therefore, the rms speed of helium atoms at 5.4 K is approximately 1,246 m/s.

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To determine the constant angular acceleration and the time required for the flywheel to achieve an angular velocity of w=10 rad/s, starting from rest, we can use the following formula:

ω = ω₀ + αt

Where:
- ω is the final angular velocity (10 rad/s)
- ω₀ is the initial angular velocity (0 rad/s since the flywheel starts from rest)
- α is the constant angular acceleration we are trying to find
- t is the time required to reach the final angular velocity

We know that the flywheel rotates 20 revolutions, which means it covers a total angle of 20 * 2π radians (since 1 revolution = 2π radians).

Using the formula for angular displacement:

θ = ω₀t + 0.5αt²

Where:
- θ is the total angular displacement (20 * 2π radians)
- ω₀ is the initial angular velocity (0 rad/s)
- α is the constant angular acceleration we are trying to find
- t is the time required to reach the final angular velocity

Substituting the values into the equation, we get:

20 * 2π = 0.5αt²

Simplifying, we have:

40π = αt²

We also know that the final angular velocity is related to the angular acceleration and time by:

ω = αt

Substituting the given value, we have:

10 = αt

Now we have a system of two equations:

40π = αt²
10 = αt

From the second equation, we can solve for α in terms of t:

α = 10/t

Substituting this value of α into the first equation, we get:

40π = (10/t) * t²

Simplifying further:

40π = 10t

Solving for t:

t = (40π) / 10
t = 4π

So, the time required for the flywheel to achieve an angular velocity of 10 rad/s is 4π seconds.

Now, let's find the constant angular acceleration:

α = 10 / t
α = 10 / (4π)
α = 2.53 rad/s²

Therefore, the constant angular acceleration is approximately 2.53 rad/s².


To determine the constant angular acceleration and the time required for the flywheel to achieve an angular velocity of w=10 rad/s, starting from rest, we can use the formulas relating angular velocity, angular acceleration, and time.

The flywheel rotates 20 revolutions, which is equivalent to 20 * 2π radians of total angular displacement. We can use the formula for angular displacement to relate this value to the initial angular velocity, constant angular acceleration, and time.

By substituting the given values into the formula, we get the equation 20 * 2π = 0.5αt².

Simplifying further, we have 40π = αt².

We also know that the final angular velocity is related to the angular acceleration and time by the equation ω = αt.

By substituting the given value of ω=10 rad/s,

we have 10 = αt.

Now, we have a system of two equations: 40π = αt² and

10 = αt.

By solving for α in terms of t from the second equation, we get α = 10/t.

Substituting this value of α into the first equation, we get 40π = (10/t) * t².

Simplifying further, we have 40π = 10t.

Solving for t, we get t = (40π) / 10

= 4π seconds.

Therefore, the time required for the flywheel to achieve an angular velocity of 10 rad/s is 4π seconds.

To find the constant angular acceleration, we substitute the value of t back into α = 10 / t,

giving us α = 10 / (4π)

≈ 2.53 rad/s².

The constant angular acceleration is approximately 2.53 rad/s², and the time required for the flywheel to achieve an angular velocity of 10 rad/s is 4π seconds.

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Question 1.

now, we know :

=》

\(p.e = mgh\)

=》

\(67500 = 4500 \times 10 \times h\)

=》

\(67500 = 45000 \times h\)

=》

\(h = \dfrac{67500}{45000} \)

=》

\(h = 1.5 \: m\)

note : if we take acceleration due to gravity as 9.8, then height = 1.53 m

Question 2.

we know,

=》

\(k.e = \dfrac{1}{2} mv {}^{2} \)

=》

\(63000 = \dfrac{1}{2} \times 4500 \times {v}^{2} \)

=》

\( {v}^{2} = \dfrac{63000 \times 2}{4500} \)

=》

\( {v}^{2} = 28\)

=》

\(v = \sqrt{28} \)

=》

\(v = 2 \sqrt{7} \: \: ms {}^{ - 1} \)

or

=》

\(5.29 \: \: ms {}^{ - 1} \)

ANSWER

EXPLANATION

If force F keeps the object in equilibrium

Answer:

See below

Explanation:

Find the x components of all of the forces shown, add them together, the x-component of the force F will be exactly opposite ( same magnitude but 180 degrees different)

30 cos 55  +     40 cos 205   +   50 cos 320  =  19.26    <====x component sum of all of the forces shown

F  (the x component of ) will be   Either    - 19.26   At zero degrees

                                                                 Or 19.26 at 180 degrees

A. The final temperature of the system is 0°C.

B. The amount of ice (if any) remaining is  0.0331 g

C. The initial temperature of the water that would be enough to just barely melt all of the ice is 20.57 °C.

The specific heat is the amount of heat required to change the temperature by 1°C. It is denoted by C.

Heat lost or gained is represented as

Q = m C ΔT

Given, Mass of ice, mice = 9x10⁻² kg, Mass of water, mw =0.35 kg, T = 13 °C

A. If ice is in excess, final water temperature will be 0°C.

B. Specific heat of water Cp = 1000 cal/kg°C

Latent heat of ice L = 80 kcal/kg

In that case, heat lost by water =Heat gain by ice

Q = mCp x dT = mL

0.35 x 1000 x 13 = m x 80 x 1000

m = 0.0569 kg of ice.

The gram of ice remaining = 0.09 - 0.0569

                                             = 0.0331 gram of ice.

Thus,  the amount of ice remaining is 0.0331 g

C. Heat required to melt 90 gram of ice,  Q  mL

Q = 90 x 80 = 7200 cal.

If the initial temperature of water needed = T,

mCp x dT = mL

350 x T = 7200

T = 20.57 °C

Thus,  the initial temperature of the water that would be enough to just barely melt all of the ice is  20.57 °C.

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Given that

heat capacity of water = 4200

heat capacity of aluminium = 897

heat capacity of oil = 1900

heat capacity of gold = 129

Heat capacity is the amount of heat a material absorbs to increase its temperature by 1 degree Celsius.

So, larger the heat capacity of a material lower will be the temperature change.

If equal amount of energy is applied to the materials, then gold will have the greatest temperature change as its heat capacity is lowest than other materials.

Explanation:

Methane (CH4) is 30 times stronger than carbon dioxide as an absorber of infrared radiation.

Answer:

The main reasons why CH4 has a higher vapor pressure at a given temperature when compared to CH3Cl is that CH4.

And Is 30 Times Stronger than Carbon dioxide...

Explanation:

Hope It Helps!!!

The potential energy of Nan suitcase of mass 14 kg is 54.88 J.

Potential energy is the energy of a body due to its position in the gravitational field.

To calculate the potential energy, we use the formula below

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the potential energy is 54.88 J.

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Answer:

A centripetal force

Explanation:

The type of force in the given scenario is tension. The correct option is c.

Tension is defined in physics as the pulling force conveyed axially by a string, cable, loop, or similar material, or by every end of a rod, truss member, or similar three-dimensional object.

Tension can also be defined as the action-reaction pair of forces acting at each end of said elements.

Newton's second law states that the tension in the rope must equal the weight of the backed mass.

Tension, the normal force, and friction are all examples of contact forces.

Since the weight is not moving, the acceleration is zero. Even if the acceleration is not zero, this equals zero.

Thus, the correct option is c.

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Your question seems incomplete, the missing options are:

The braking force of the tram is 25 kN, with a negative sign indicating that it is in the opposite direction to the initial motion of the tram.

What is Force?

Force is a physical quantity that can change the state of motion or shape of an object. It is defined as any influence that causes an object to undergo a change in velocity or direction. Force can be measured in Newtons (N) and is represented by the symbol F. The magnitude of the force can be calculated as the product of mass and acceleration, or as the rate of change of momentum over time. Force is a vector quantity, meaning it has both magnitude and direction.

To calculate the force acting on the man, we can use Newton's second law, which states that force is equal to mass times acceleration: F = m * a. Plugging in the given values, we get:

F = 50 kg * 3 m/s² = 150 N

Therefore, the force acting on the man is 150 N.

To calculate the braking force of the tram, we can use the equation:

a = (v_f - v_i) / t

where a is the acceleration, v_f is the final velocity, v_i is the initial velocity, and t is the time interval.

We are given that the initial velocity is 72 km/h, which we need to convert to m/s:

v_i = 72 km/h * (1000 m/km) / (3600 s/h) = 20 m/s

We are also given that the final velocity is 0 km/h, or 0 m/s. Finally, we are given that the time interval is 20 seconds.

Plugging these values into the equation for acceleration, we get:

a = (0 m/s - 20 m/s) / 20 s = -1 m/s²

The negative sign indicates that the acceleration is in the opposite direction to the initial motion of the tram, which is the direction of the braking force.

To calculate the braking force, we can again use Newton's second law, F = m * a, where m is the mass of the tram. We are not given the mass of the tram, but we can use the formula for kinetic energy to relate the mass, velocity, and braking force:

K = (1/2) * m * v_i^2

where K is the kinetic energy of the tram. At the beginning of the braking process, all of the kinetic energy of the tram is being dissipated by the braking force, so we can equate the kinetic energy to the work done by the braking force:

K = F * d

where d is the distance over which the braking force acts.

We are not given the distance over which the braking force acts, but we can solve for it using the formula for average velocity:

v_avg = d / t

At the beginning of the braking process, the average velocity is equal to the initial velocity, so we can write:

v_i = d / t

Solving for d, we get:

d = v_i * t = 20 m/s * 20 s = 400 m

Now we can plug in the values for mass, velocity, distance, and acceleration to solve for the braking force:

K = (1/2) * m * v_i^2

F * d = (1/2) * m * v_i^2

F = (1/2) * m * v_i^2 / d

F = (1/2) * m * v_i^2 / (v_i * t)

F = (1/2) * m * v_i / t

F = (1/2) * m * (-1 m/s²)

F = -25 m * kg/s²

F = -25 kN

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The mechanical advantage in this scenario is approximately 3.33. The mechanical advantage can be calculated by dividing the load (force) by the effort (force). In this case, the load is the weight of the car, which is 500N, and the effort is the force applied parallel to the plank, which is 150N. Therefore, the mechanical advantage is:

Mechanical Advantage = Load / Effort = 500N / 150N = 3.33

The mechanical advantage in this scenario is approximately 3.33. This means that for every 1N of effort applied, the load is effectively lifted with a force of 3.33N. The mechanical advantage indicates how much the input force is amplified or reduced by the machine or system being used.

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Answer:

180 because it's half of a full rotation before they shoot the other person.

Answer:

The value of the changed current is approximately 3.585A.

Explanation:

This particular problem can be approached by the formula for the magnetic force in a current-carrying coil.

F = IBL      {mark as equation 1}

where:

F is the magnetic force,

I is the current,

B is the magnetic field,

L is the length of the wire.

The given conditions are:

Initial current, I = 5.9 A

Initial magnetic force, F= 0.031 N

Upon manipulating equation 1, we get:

B=F/(I*L)

Now this implies:

B=0.031N/(5.9A*L)------------equation-2

Now after the conditions are changed,

B'=B

L'=L

I'=?

F'=0.019N

Therefore,

B'=B=0.019N/(I'*L')------------equation-3

Now, solving equations 2 and 3, we get

I'= 0.019 N / (B * L) =

0.019 N / (0.031 N / (5.9 A * L) * L)

= 0.019 N / (0.031 N / 5.9 A)

= 0.019 N * (5.9 A) / 0.031 N

≈ 3.585 A

Therefore the value of the changed current is approximately 3.585A.

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Answer:

Ωmass

Explanation:

If there were no dark energy in the universe, the value of Ωmass would determine the evolution and fate of the universe.

Surface energy for a (100) plane in a BCC single crystal is greater than that for a (110) plane due to the higher atomic packing density in the (100) plane, which results in more atomic bonds and higher energy requirement to create a new surface.

The (100) plane contains more atoms per unit area compared to the (110) plane, which results in a higher surface energy. To understand this, let's compare the number of atoms in each plane.

In the (100) plane, there are four atoms per unit cell, with each atom contributing 1/4th of its volume to the surface area. On the other hand, the (110) plane has two atoms per unit cell, with each atom contributing 1/2th of its volume to the surface area.

Since the (100) plane has more atoms per unit area, there are more atomic bonds that need to be broken to create a new surface. This leads to a higher energy requirement, resulting in a higher surface energy.

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Answer:

18

Explanation:

12 - 5 + 8 = 15

12 - 8 = 4

7 - 4 = 3

15 + 3 = 18

Answer:

3 meters

Explanation:

add up dum boi

The electrical potential between the anode and the cathode alters when a charged particle enters the tube. This shift in voltage in the electrical circuit results from the potential change in the tube and counts as a change.

When radiation strikes the gas inside the tube, it dislodges an electron from the gas particle and produces an ion pair. The tube's centre has a filament that draws electrons.

The ionisation process is used by a Geiger counter to measure and identify radiation. The chamber of the gadget contains a stable gas. This gas ionises when subjected to radioactive particles.

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Answer:

The answer is 2 because 10 times 2 equals 20

Explanation:

Answer:

2 cm

Explanation:

A=L * w

20 = 10 * L

L = 20/10

L = 2cm

Answer:

0.63

Explanation:

because i used the sin symbol

The longest wavelength of electromagnetic radiation that will eject photo-electron from the sodium metal is 544 nm.

Electromagnetic radiation consists of waves of electromagnetic field, which propagates through space and carries momentum and electromagnetic radiant energy.

Minimum energy required to knock out an electron from the surface of the metal is called the work function.

As we know that, W= hc/λ

h -- Planck's constant ; c -- Speed of light

and λ is Longest wavelength

Given, work function of sodium metal is 2.28 eV

As 1 eV = 1.6021 * 10^-19 J

=2.28 * 1.6021 * 10^-19

= 3.65 *10^-19 J

W= hc/ λ

3.65 *10^-19 = 6.62 *10^-34 * 3 *10^8/ λ

λ = 5.44 * 10 ^-7m

λ =544 nm

The longest wavelength of electromagnetic radiation that will eject photo-electron from the sodium metal is 544 nm.

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