Emmit is lifting a box vertically which forces are necessary for calculating the total force

½ × 18 × 6² = 324 J

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Answer:

The gravity helps the planets stay together near the Sun, without it Earth would be floating away with the planet eventually becoming frozen up, thus the role gravity have in the motion of planets around the sun is by keeping them together.

Explanation:

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Answer:

Less than 50N

Explanation:

Given that a pair of wires holding a hanging light that weighs 50N.

Since the hanging weight is equal to 50 N, the sum of the tension in the wires will also experience the same magnitude of force acting on the weight.

Considering each of the wire, the tension on each of the wire will surely be less than 50N

Therefore, the tension in each wire is less than 50N

Answer:

Explanation:

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Answer: C.

The buoyant force is stronger than the force of gravity.

Explanation:because I did it

The new acceleration of the object would be 1.85 m/s².

Newton's second law of motion states that, the force applied to an object is directly proportional to the product of mass and acceleration of the object.

F = ma

\(k = \frac{F}{ma} \\\\\frac{F_1}{m_1a_1} = \frac{F_2}{m_2a_2}\\\\a_2 = \frac{F_2 m_1 a_1}{F_1 m_2} \\\\a_2 = \frac{2.1F_1 \times m_1 \times 3}{F_1 \times 3.4m_1} \\\\a_2 = 1.85 \ m/s^2\)

Thus, the new acceleration of the object would be 1.85 m/s².

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Explanation:

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Answer:

Molar mass of NH3=14+3=17g

\(mole = \frac{given \: mass}{molar \: mass} \\ mole = \frac{28}{17} \\ mole = 1.65\)

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Answer:

two attracting magnets are released while moving away from one another.  

Explanation:

Answer:the correct answer is: two attracting magnets are released from hole moving towards one another

Explanation:

Answer:

I believe it is actually C

Explanation:

Matter and energy cannot be created or destroyed so A is incorrect

Since energy cannot be created, B is incorrect

while C and D both sound correct, D does not mention entering while C does so I believe C is correct. When i submit this answer into my quiz, i will add if i am right.

In the universe, all energy and matter are contained; no energy or matter enters or exits - the statement best describes why the universe could be considered an isolated system.

A thermodynamic system is said to be isolated if it cannot exchange either mass or energy with the outside world. In contrast to a closed system, energy can't move across isolated systems. Energy can move freely within and outside of closed systems; they are only closed to matter.

As both energy and matter can not exit from a universe, we can consider universe as a isolated system.

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Answer:

She won't have any kenetic energy at the bottom of the hill

Explanation:

Answer:

Mass, m = 1561.23kg

Explanation:

Given the following data;

Weight = 15300N

We know that acceleration due to gravity is equal to 9.8m/s²

To find mass;

Weight can be defined as the force acting on a body or an object as a result of gravity.

Mathematically, the weight of an object is given by the formula;

\( Weight, W = mg\)

Where;

Substituting into the equation, we have;

\( 15300 = m*9.8\)

\( m = \frac {15300}{9.8}\)

Mass, m = 1561.23 Kg

Therefore, the mass of the car is 1561.23 kilograms.

The moon of Jupiter, Ganymede is the largest moon in the solar system. The mass of Jupiter when the orbital period and the distance from the centre of the orbit are given is calculated to be 1.57 × 10²⁷ kg.

The time required to complete one revolution in an orbit around the planet is known as the Orbital Time period of motion. The orbital distance's cube is directly proportional to the square of the time period.

Given that,

Orbital distance R = 1.07 × 10⁹ m

Time period T = 6.18 × 10⁵ s

We know the formula of time period as,

T² = 4 π² R³/ G M

where, M is the mass of Jupiter

G is the gravitational constant

(6.18 × 10⁵)² = 4 π² (1.07 × 10⁹)³/(6.67 × 10⁻¹¹) M

Making M as subject, we have,

M = 4 π² (1.07 × 10⁹)³/[ (6.67 × 10⁻¹¹) (6.18 × 10⁵)²] = 1.57 × 10²⁷ kg

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The diameter has reached 10 m, the rate at which it is increasing is approximately 0.0477 m/min.

The rate at which the diameter is increasing, we can use the formula for the volume of a sphere: V = (4/3)πr³, where V is the volume and r is the radius.
The balloon is being inflated at a rate of 15 m³/min, we need to find the rate at which the diameter is increasing. Since the diameter is twice the radius, we can use the relationship d = 2r, where d is the diameter.
First, we need to find the radius when the diameter is 10 m. Since the diameter is zero at time zero, the radius will also be zero at that time.

However, we want to find the rate at a diameter of 10 m, so we need to find the radius when the diameter is 10 m.
d = 10 m, we can substitute it into the equation d = 2r and solve for r:
10 = 2r
r = 5 m
Now, we can find the rate at which the diameter is increasing by differentiating the volume equation with respect to time:
dV/dt = 4πr²(dr/dt)
We are given that dV/dt = 15 m³/min and r = 5 m. Substituting these values, we can solve for dr/dt:
15 = 4π(5)²(dr/dt)
15 = 100π(dr/dt)
dr/dt = 15 / (100π)
dr/dt ≈ 0.0477 m/min
Therefore, when the diameter has reached 10 m, the rate at which it is increasing is approximately 0.0477 m/min.

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The difference in time between the sound waves being detected at the other end of the plank and the sound being heard through the air will be 0.09 sec.

A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.

Given data;

The speed of sound in wood,u= 3300 m/s

The speed of sound in air,v=330 m/sec

long plank of wood, L=33 m

The time period in the air was found as;

T₁ = 33 m / 330 m/sec

T₁= 0.1 sec

The time period in wood ;

T₂= 33 m / 3300 m/sec

T₂=0.01 sec

T = T₁ - T₂

T=0.1-0.01

T=0.09 sec

Hence, the difference in time between the sound waves being detected at the other end of the plank and the sound being heard through the air will be 0.09 sec.

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Answer: Waxing crescent moon

Explanation: The moon phase that comes after the new moon is waxing crescent and before the first quarter.

13.The color with the longest wavelength is option A. Red.

14.The sky appears blue due to option D. Scattering of light.

Red light has a longer wavelength compared to yellow and blue light.The color that has the longest wavelength is red. The color of the sky appears blue due to scattering of light. The distance between one peak and the next in a series of waves, particularly electromagnetic waves traveling through space or along a wire is referred to as wavelength.

The wavelength of light, for example, determines its color. Red light has the longest wavelength, followed by orange, yellow, green, blue, and purple, with violet light having the shortest wavelength. When light is reflected off a surface or passes through a medium, it can be deflected in various directions, a phenomenon known as scattering of light.

The Earth's atmosphere scatters sunlight in all directions, but the shorter blue wavelengths are scattered more than the longer wavelengths. As a result, we perceive the sky as blue during the day.  The light becomes scattered when it interacts with particles in the atmosphere, causing the sky to appear blue during the day and red during sunset or sunrise. The scattering of light is the process that causes the sky to appear blue.

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If the resistance remains constant and the voltage doubles, the power will increase by a factor of 4 (option E)

The following data were obtained from the question:

P = V² / R

Resistance is constant, we have

V₁² / P₁ = V₂² / P₂

V² / P = (2V)² / P₂

V² / P = 4V² / P₂

Cross multiply

V² × P₂ = P × 4V²

Divide both side by V²

P₂ = P × 4V² / V²

P₂ = P × 4

From the above, we can conclude that the power will increase by a factor of 4 (option E)

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The temperature of the pressing comb and the amount of pressure used are adjusted based on the texture of the hair. length style texture cleanliness

Temperature is defined as the measure of the amount of hotness or coldness of the body. There are various units used to measure temperature. The most used temperature scales are Celsius, Fahrenheit and Kelvin.

Pressure is defined as the amount of force exerted per unit area. Pressure is expressed using a variety of units, some of these come from dividing a unit of force by a unit of area; the standard unit of pressure in the imperial system is the pound-force per square inch (psi), which is equivalent to one newton per square meter (N/m2) in the SI.

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==> Object A travels for 60 seconds before Object B starts out.

==> Object A moves at 2 m/s.

==> So Object A has a lead of 120 m when Object B starts out.

==> Object B moves at 3 m/s . . . 1 m/s faster than Object A.

==> So Object B catches up on Object A by 1 m every second.

==> Object B closes up Object A's lead of 120 m in 120 seconds.  

The criterion of significant figures can to find the result with reliable figures

          X = 9.2 10⁻⁵

now with the propagation of errors we obtain the result with its uncertainty

         X ± ΔX = (9.2 ± 0.5) 10⁻⁵

given Parameter

     * expression values ​​with their absolute errors

to find

     * the result with the correct significant figures

     * the absolute error of the expression

Significant figures are defined with the number of decimals that give information, the number of figures in a quantity gives information about the uncertainty of this quantity.

There are two criteria for applying significant figures:

     * Add and subtract the result of going with the number of decimal places of the figure that has the least

    * Product and division as a result of going with the least number of significant figures than the value that has the least.

Remember that the zero to the left do not form a pair of the significant figures

Let's apply this belief to the case presented, let's write the precaution

              \(x = \frac{a-b}{c}\)

where in this case they are worth

         a = 0.0336 ± 0.0002

         b = 0.010 ± 0.001

         c = 255.4 ± 0.4

We see that the significant figures of each parameterize (a, b, c) and their absolute errors are correct.

Let's apply the criteria to the operation

          a-b = 0.0336 - 0.010

          a- b = 0.0236

we apply the criterion of significant figures for the subtraction, the result must be with 3 decimal places

        a - b = 0.024

let's do the other operation

         X = \(\frac{a-b}{c}\)

         X = 0.024 / 255.4

         X = 9.24 10⁻⁵

We apply the criterion of significant figures for the division, in this case the result is left with two significant figures

         X = 9.2 10⁻⁵

The uncertainty or error of the measurements is of most importance as it determines how many significative figures are reliable at a given magnitude.

If the magnitudes are measured with some type of instrument, the absolute error is given by the appreciation of the instrument, if the magnitude is calculated using some equation, the errors must be propagated using the variations of each parameter in the worst case.

the uncertainty of the calculated quantity (X) is

        \(\Delta X = | \frac{dX}{da}| \Delta a + | \frac{dX}{db} | \Delta b + | \frac{dX}{dc}| \Delta c\)

let's perform the derivatives

        \(\frac{dX}{da} = \frac{1}{c}\)

        \(\frac{dX}{db} = - \frac{1}{c}\)

        \(\frac{dX}{dc} = - \frac{a-b}{c^2}\)

we substitute

remember that the bulk value guarantees that we tune the worst case. So all the mistakes add up

          ΔX = \(\frac{1}{c}\)  Δa +

          ΔX = (Δa + Δb) + Δc

we substitute

         ΔX = \(\frac{1}{255.4}\)  (0.0002 + 0.001) + \(\frac{0.0336-0.010}{255.4^2}\)  0.4

         ΔX = 4.698 10⁻⁶ + 1.45 10⁻⁷

         ΔX = 4.8 10⁻⁶

Absolute errors must be given with a single significant figure

         ΔX = 5 10⁻⁶

The result of the requested quantity using the criterion of significant figures and propagation of errors is

          X ± ΔX = (9.2 ± 0.5) 10⁻⁵

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Answer:

The boiling point on top of a mountain would be lower than at sea level because the altitude would be higher and air pressure would decrease.

As the height increases, because most of the air molecules are held near to the surface and hence pressure by gaseous substance will be lower at higher altitudes results in lowering boiling point also.

Boiling point of a substance is the temperature at which the substance changes from the liquid state to vapor state where both  phases are in equilibrium and the pressure of vapor phase above the liquid phase will be equal to the atmospheric pressure.

The boiling point is dependent on the bond type, molecular weight, temperature and pressure. At higher altitudes, the pressure will be reduced due to the less denser air.

The volume of gas molecules is higher on elevation and thus, a decreased pressure causes, the water molecules easily boil with weekend intermolecular force thus, boiling point at mountain will be less than that at sea level.

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The International System of Units is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world.

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Answer:

Explanation:

Current refer to the rate at which electric charge flow or run or move in an electric circuit . It is measured in Ampere or coulumb per second.

The SI unit is Ampere and it is represented by A. It is a scalar quantity.

1 Ampere is the current that will produce an attractive force of 2 × 10^-7 Newton per meter of length between two parallel conductors.

The velocity of the cars after the collision is approximately 5.89 m/s, and there is a loss of kinetic energy in the collision.

What is collision?

In physics, a collision refers to an event in which two or more objects interact with each other, resulting in a change in their motion or properties. Collisions can occur between particles, atoms, molecules, or macroscopic objects, and they are governed by the principles of conservation of momentum and energy.

To find the velocity of the cars after the collision, we can apply the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

The momentum of an object is calculated by multiplying its mass by its velocity. Let's assume car A moves to the right and car B moves to the left. The momentum of car A before the collision is given by p_A = m_A × v_A, where m_A is the mass of car A and v_A is its velocity. Similarly, the momentum of car B before the collision is given by p_B = m_B × v_B, where m_B is the mass of car B and v_B is its velocity.

The total momentum before the collision is the sum of the momenta of car A and car B: p_total_before = p_A + p_B.

Since the cars remain stuck together after the collision, they have a common final velocity (v_final). According to the conservation of momentum, the total momentum after the collision is equal to the total momentum before the collision: p_total_after = (m_A + m_B) × v_final.

Setting the two equations equal to each other, we have: p_total_before = p_total_after,

m_A × v_A + m_B × v_B = (m_A + m_B) × v_final

Now we can plug in the given values:

m_A = 2000 kg

v_A = 72 km/hr = 20 m/s

m_B = 1250 kg

v_B = -60 km/hr = -16.7 m/s (negative sign indicates opposite direction)

Plugging these values into the equation, we can solve for v_final:

2000 kg × 20 m/s + 1250 kg × (-16.7 m/s) = (2000 kg + 1250 kg) × v_final

40000 kg·m/s - 20875 kg·m/s = 3250 kg × v_final

19125 kg·m/s = 3250 kg × v_final

v_final = 19125 kg·m/s / 3250 kg

v_final ≈ 5.89 m/s

Therefore, the velocity of the cars after the collision is approximately 5.89 m/s.

To determine if kinetic energy is lost, we can compare the kinetic energy before and after the collision. Kinetic energy is given by the formula KE = (1/2) × m × v², where m is the mass of the object and v is its velocity.

The initial kinetic energy (KE_initial) is the sum of the kinetic energies of car A and car B: KE_initial = (1/2) × m_A× v_A² + (1/2) × m_B × v_B²

The final kinetic energy (KE_final) is the kinetic energy of the combined cars: KE_final = (1/2) × (m_A + m_B) × v_final²

Now we can calculate the initial and final kinetic energies using the given values:

KE_initial = (1/2) ×2000 kg × (20 m/s)²+ (1/2) × 1250 kg × (-16.7 m/s)²

KE_final = (1/2) × (2000 kg + 1250 kg) × (5.89 m/s)²

Calculating these values, we find:

KE_initial ≈ 400,625 J

KE_final ≈ 51,696 J

As we can see, the initial kinetic energy is much higher than the final kinetic energy. Therefore, there is a significant loss of kinetic energy during the collision. In summary, the velocity of the cars after the collision is approximately 5.89 m/s, and there is a loss of kinetic energy in the collision.

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The kinetic energy lost during the collision is:482018.35 J.

Given information:

Mass of car A, mA = 2000 kg

Speed of car A, vA = 72 km/h = 20 m/s

Mass of car B, mB = 1250 kg

Speed of car B, vB = 60 km/h = 16.67 m/s

Cars move towards each other and stick after collision. Therefore, the velocity of both cars after collision is the same, v.

Using the law of conservation of momentum, we can find the velocity of both cars after the collision.L

et the initial velocity of car A be uA. Similarly, let the initial velocity of car B be uB.

uA = 20 m/suB = -16.67 m/s (negative sign is used to indicate that car B is moving in the opposite direction of car A)

Total initial momentum of the system is:

pinitial = mA × uA + mB × uB= 2000 × 20 + 1250 × (-16.67)= 40000 - 20837.5= 19162.5 kg m/s

Total final momentum of the system is:

pfinal = (mA + mB) × v= (2000 + 1250) × v= 3250 × v

According to the law of conservation of momentum:

pinitial = pfinal19162.5 = 3250 × vv = 5.9 m/s

Hence, the velocity of both cars after the collision is 5.9 m/s.

Kinetic energy before collision:

KEinitial = 1/2 × mA × vA² + 1/2 × mB × vB²

KEinitial = 1/2 × 2000 × 20² + 1/2 × 1250 × 16.67²

KEinitial = 400000 + 138889.6 = 538889.6 J

Kinetic energy after collision:

KEfinal = 1/2 × (mA + mB) × v²

KEfinal = 1/2 × 3250 × 5.9²

KEfinal = 56871.25 J

Therefore, the kinetic energy lost during the collision is:

KElost = KEinitial - KEfinal= 538889.6 - 56871.25= 482018.35 J.

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Answer:

The two rays, CY and DM are diverging rays and when extended behind the mirror, they appear to intersect each other at point M'. Therefore, the properties of the images formed here are formed behind the mirror, between the pole and principal focus (f), the images are diminished and are virtual and erect.

Explanation:

Answer:

This questions answers are on the baisis of where the object is placed and see the atachments to know more

Answer:

When an apple falls from a tree tothe ground, the potential energy ofthe fall is converted into kineticenergy,which is kinetic energy. Whenan apple hits the ground, it convertskinetic energy into heat energy

Explanation:

Question:

What happens to the mechanical energy of the apple as it falls from the tree?

Answer:

When the apple falls from the tree, it has some gravitational potential energy due to its height. When it fails, the Gravitation Potential energy will begin converting into Kinetic Energy.

Physical changes refer to alterations in the properties or characteristics of matter without changing its chemical composition. Some examples of physical changes include changes in state, size, shape and color.

Changes in state are common physical changes that occur when matter transitions between solid, liquid, or gas phases. This change occurs due to a change in temperature or pressure. For example, water freezing into ice or boiling into steam are examples of changes in state.

Changes in size, shape, and texture occur when matter undergoes physical alterations without any changes in its chemical composition. For instance, cutting a piece of paper into small pieces, hammering a metal sheet to make it thinner, or molding clay into a different shape are all examples of physical changes.

Changes in color are also physical changes. They occur when the light-reflecting properties of a material change due to a physical alteration. For instance, when copper is exposed to air, it turns green due to a chemical reaction, but when iron rusts, it changes color due to a physical change in its surface.

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The Earth is closer to the Sun in January than in July, which accounts for the fact that the highest high tides in the Northern Hemisphere occur in January.

What is Tide?

Tide refers to the periodic rising and falling of water level in a sea or ocean, caused by the gravitational force of the Moon and Sun on the Earth. It results in the cyclical rise and fall of the sea level in a specific place over a period of several hours. Types of Tides: There are two types of tides based on their frequency of occurrence:

Spring Tide: When the sun, moon, and earth are in a straight line (full moon or new moon), the effect of the sun's gravitational pull and the moon's gravitational pull is combined. This is known as a spring tide, which causes high tides to be even higher and low tides to be even lower.

Neap Tide: When the Sun, Earth, and Moon are at right angles to each other (half-moon), the gravitational force of the Sun reduces the gravitational force of the Moon. This results in neap tides, which are characterized by low tides that are not as low, and high tides that are not as high. Cause of Highest Tide: During January, the Earth is closest to the Sun in its elliptical orbit. This results in a stronger gravitational pull on the Earth by the Sun, which causes high tides to be higher. So, the highest high tides in the Northern Hemisphere occur in January.

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Answer:

Explanation:

I guess so because it has ingredients such as froot loops, frosted flakes, and such plus its liquid.