Which quantity is a vector?
displacement
distance

Answer:

Average velocity, V = 2.5m/s

Explanation:

Given the following data

Displacement = 10m

Time = 4secs

Average velocity can be defined as the rate of change in displacement with time. Velocity is a vector quantity and as such it has both magnitude and direction.

Mathematically, average velocity is given by the equation;

\(Velocity = \frac{displacement}{time}\)

\(V = \frac{d}{t}\)

Substituting into the above equation;

\(V = \frac{10}{4}\)

Average velocity, V = 2.5m/s

The equator is characterized by relatively  low atmospheric pressure aloft.

The equator is a large circle that surrounds Earth and sits on a plane perpendicular to its axis, everywhere being equally far from the geographic poles.

This geographic, or terrestrial, Equator separates Earth's Northern and Southern hemispheres and serves as the fictitious reference line on the planet's surface from which latitude is calculated; in other words, it is the line at latitude 0°.

In hotter equatorial regions, the air above expands, gets less dense, and rises. At this latitude, this causes a low pressure band to form.

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Answer:

c

Explanation:

i think

Answer: B

Explanation:

Answer:

47.515 cm²

In meter square= 4.7515 *10^-3 m²

Explanation:

The radius of a circle = 5.5 cm

In meter= 5.5*0.01

= 0.055 m

the circumference= 34.56 cm

in meters = 34.56 cm*0.01

= 0.3456 meters

the area= 95.03 cm²

in square meters =95.03*(0.01)²

in square meters= 9.503*10^-3 m²

. area under the curve at the right

= Area of semi circle

= Area of circle/2

= 95.03 /2

= 47.515 cm²

In meter square= 4.7515 *10^-3 m²

The actual volume of water measured out is 10.018 ml

Volume of water measured by the pipette, V = 10 ml

Mass of the water, m = 9.990 g

Density of water, ρ = 0.9978 g/ml

density = mass / volume

volume = mass / density

Substituting the given values,

volume = 9.990 g / 0.9978 g/ml

volume = 10.018 ml

The actual volume of water is 10.018 ml, which is slightly higher than the intended volume of 10 ml. This could be due to factors such as the pipette not being calibrated correctly, or the surface tension of the water causing it to cling to the inside of the pipette.

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The balls will be at the same height above the ground at 1.16s.

Equations of motion in physics are equations that explain how a physical system behaves in terms of how its motion changes over time. The behaviour of a physical system is described in more detail by the equations of motion as a collection of mathematical functions expressed in terms of dynamic variables.

Before they collide, the falling ball travels a distance of (20m-h), where h is the height above the earth. We submit

yf= yi + vit - 0.5 gt²

to the falling ball to obtain,

-(20-h)= - 0.5 gt²

Applying yf= yi + vit - 0.5 gt² to the rising ball gives,

h= 17.2t - 0.5gt²

Combining both equations,

t= \(\frac{20}{17.2}\) = 1.16 s

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Answer:

Change in velocity and direction over a specific period of time.

Explanation:

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate the acceleration of an object.

Mathematically, acceleration is given by the equation;

\(Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}\)

\(a = \frac{v - u}{t}\)

Where,

a is acceleration measured in \(ms^{-2}\)

v and u is final and initial velocity respectively, measured in \(ms^{-1}\)

t is time measured in seconds.

Hence, the types of changes in motion that cause acceleration is a change in velocity and direction over a specific period of time.

128.72 Wb is the magnetic flux through the loop

A measurement of the total magnetic field that traverses a specific area is called magnetic flux.

It is a helpful tool for explaining how the magnetic force affects things inhabiting a certain area.

The precise area selected will determine how magnetic flux is measured.

Given,

Diameter of Circular Loop = 16 cm

The radius of Circular Loop = 8 cm

Area of Circular loop = πr² = 22/7 × 8 × 8

                                   =  201.14 cm²

Magnetic field = 0.64 T

The angle between area vector and the field lines = 0°

Formula used :

Magnetic flux (Ф) = B.Acosθ

where B = Magnetic field of a circular loop of wire

A = Area of a circular loop of wire

θ = Angle between area vector and the field lines

Magnetic flux = 0.64 × 201.14 × 1

                       = 128.72 Wb

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In traditional mass media, advertising is the paid media space that sponsors use to persuade audiences

Advertising is a form of communication aimed at publicizing a product or service in order to influence the public to purchase or use it.

This type of communication is paid and promoted by companies and media with a commercial purpose.

For example, a company specializing in designing and implementing ads for other company's products is an advertising company.

There are four types of advertising:

the communication is a process through which information is transmitted through the use of oral or written language.

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The student in the voltage measurement experiment encountered two sources of uncertainty: 2.0 volts due to parallax and 1.0 volts due to circuit elements. The question asks for the total uncertainty that the student should write in their voltage measurement.

To determine the total uncertainty, we need to consider the sources of uncertainty and combine them using the rules of error propagation. Since the uncertainties are given as absolute values, we will add them together to obtain the total uncertainty.

Adding the uncertainty due to parallax (2.0 volts) and the uncertainty due to circuit elements (1.0 volts) gives a total uncertainty of 3.0 volts.

Therefore, the student should write a total uncertainty of +/- 3.0 volts in their voltage measurement.

Option (e) is the correct choice: +/- 3.0 volts.

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Answer:

A, number 1

Explanation:

because it forms a point of where the inersection begins.

The maximum height of the ball is approximately 6.096 m and the work done by gravity is -4.95 J.

Given information,

m = 0.071 kg

V₀ = 11 m/s

(a) Finding the maximum height:

The initial kinetic energy of the ball is converted into potential energy at its maximum height.

Initial kinetic energy = Potential energy at maximum height

(1/2)mv₀² = mgh

(1/2)(0.071 kg)(11 m/s)² = (0.071 kg)(9.8 m/s)h

h = (0.5)(11²)/(9.8) ≈ 6.096 m

Part (b) Calculating the work done by gravity:

The work done by gravity during the ball's flight to its maximum height is equal to the change in potential energy. Since the gravitational potential energy is defined as zero at the initial height, the work done by gravity is equal to the negative of the potential energy at the maximum height.

Wg = -mgh

Wg = -0.071 × 9.8 × 6.096

Wg ≈ -4.95 J

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The value that represents the mass of block C that would keep crate D in equilibrium is 196.2 kg (Option D).

To determine of value that represents the mass of block C that would keep crate D in equilibrium, ee can begin by determining the tension in the ropes. Since the crate is held in a certain location by two blocks, the tension in the ropes should be equal. We can use this fact to calculate the tension in the ropes by assuming that they have the same magnitude.

In this case, let T be the tension in each rope segment. The forces acting on the system can be represented in the following free-body diagram:

For the x-direction: T sin 30° = T sin 60° + µg = 0

where µ is the coefficient of friction and g is the acceleration due to gravity. Since the pulleys are frictionless, µ = 0. Therefore, we can simplify the equation as follows:

T sin 30° = T sin 60°

Dividing both sides by T:

sin 30° = sin 60°/2

This gives us: T = (2/√3) mg where m is the total mass of the system and g is the acceleration due to gravity.

Substituting the given values, we obtain:

T = (2/√3) × 150 × 9.81 ≈ 1962 N

Next, we can use the law of the lever to calculate the mass of block C required to keep the crate in equilibrium. According to this law, the sum of the moments acting on the system must be zero. We can choose the point where the ring is attached to the rope as the pivot. This gives us the following equation:

(135 kg)(9.81 m/s²)(3 m) + (mC)(9.81 m/s²)(6 m) - (150 kg)(9.81 m/s²)(4.5 m) - (1962 N)(3 m) = 0

Simplifying: (135)(3) + (6mC) - (150)(4.5) - (1962)(3) = 0

Rearranging: 6mC = 150(4.5) + 1962 - 135(3)

6mC = 2127

mC ≈ 196.2 kg

Therefore, the value that represents the mass of block C required to keep crate D in equilibrium is approximately 196.2 kg. Thus, the correct option is D.

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Humans convert approximately 40% of the energy stored in food to useful work

Humans can store about 40% of the energy from the food consumed due to the conversion of energy from food through the metabolic process (metabolism).

The other 60% of the energy it is used to maintain the normal function of the body and the other activities that involve physical and mental activities

The energy storage is a reserve of energy that we can use in really difficult situation when the body is with no energy.

The processes of a chemical or physical nature by which the human body converts or uses energy.

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The momentum flow rate through the pipe carrying liquid ammonia is 1 × \(10^6\) kg·m/s.

The flow rate of momentum (Ṁ) through the pipe can be calculated by multiplying the mass flow rate (ṁ) by the velocity (v). The speed can be determined using the equation v = ṁ / (ρA), where ρ is the density of the liquid ammonia and A is the pipe's cross-sectional area.

Given:

ṁ = 100 kg/s

A = 0.01 m²

Assuming the density (ρ) of liquid ammonia is 700 kg/m³, we can calculate the velocity (v):

v = ṁ / (ρA)

v = 100 kg/s / (700 kg/m³ × 0.01 m²)

v = 10000 m/s

Now, we can calculate the flow rate of momentum (Ṁ):

Ṁ = ṁv

Ṁ = 100 kg/s × 10000 m/s

Ṁ = 1 × \(10^6\) kg·m/s

Therefore, the momentum flow rate through the pipe is 1 × \(10^6\) kg·m/s.

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The law of conservation of mass states that matter can neither be created nor destroyed. When wood burns, the mass of the wood is converted into a small amount of ashes and gas. The total mass of the ashes and gas is equal to the mass of the wood before it was burned, demonstrating that the law of conservation of mass holds true.

answered

just now

Answer:

yes

Explanation:

the rug can take energy from the light causing the rug's color to fade

Yes, Kiara is right because the rug can take in energy from the Sun's light, thereby causing the rug's color to fade: C. Yes. The rug can take in energy from the light, causing the rug's color to fade.

The Sun is typically characterized by nuclear reactions that usually takes place or occur at its center, which eventually result in the release of radiant (heat) energy and electromagnetic radiation into planet Earth.

Although, these radiant (heat) energy and electromagnetic radiation from the Sun are essential and very important to life on planet Earth.

However, a disadvantage of radiant (heat) energy is that when taken in by conducting materials such as rugs, it causes their color to fade (change) over time.

In conclusion, Kiara is absolutely right in her thinking because light energy (sunlight) from the Sun can cause the rug's color to become faded over time.

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Answer:

Force(Romeo moving) = 5,000 N

Explanation:

Given:

Mass of horse = 900 kg

Acceleration = 20 km/hr

Find:

Force(Romeo moving)

Computation:

Acceleration = 20 km/hr

Acceleration in m/s = 20 / 3.6 = 5.555556 m/s²

Force = m x a

Force(Romeo moving) = 900 x 5.555556

Force(Romeo moving) = 5,000 N

The atmospheric pressure will be the same at every point. Therefore, they will all have the same pressure.

The atmospheric pressure will be the same at every point. Therefore, they will all have the same pressure. Q, R, S, T, and U all have the same pressure.

The pressure at point X is greater than the pressure at points Y, Z, and W. Point W has the least pressure. Point Z has greater pressure than W but lesser than Y. Y has greater pressure than Z but less than X.

The pressure at point Z is equal to the atmospheric pressure. The atmospheric pressure acts on the open end of the tube that's why the pressure at point Z is equal to the atmospheric pressure. The pressure at point Z is in balance with the atmospheric pressure.The water level on the right-hand side will drop to a point below point Z. When water is removed from the left side, the pressure on the right side will be greater than the pressure on the left side.

So, the water will start to move towards the right side until the pressure in the left and right sides is the same again. When it is in balance, the water level on the right side will stay below point Z.

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The absolute value of the voltage across the biological membrane is approximately 64 mV.

To calculate the absolute value of the voltage across a biological membrane with [Na+] outside = 140 mM and [Na+] inside = 12 mM, under standard conditions, you can use the Nernst equation. The Nernst equation is given by:

E = (RT/zF) * ln([Na+]outside / [Na+]inside)

Where:
- E represents the voltage (or membrane potential) across the membrane
- R is the universal gas constant (8.314 J/mol K)
- T is the temperature in Kelvin (standard condition is 25°C, which is 298.15 K)
- z is the charge of the ion (for Na+, z = 1)
- F is the Faraday's constant (96,485 C/mol)
- [Na+]outside and [Na+]inside represent the concentrations of sodium ions outside and inside the membrane, respectively

Now, we can plug in the given values and constants to solve for E:

E = ((8.314 J/mol K) * (298.15 K)) / (1 * 96,485 C/mol) * ln(140 mM / 12 mM)

E ≈ (0.026 V) * ln(11.67)

E ≈ (0.026 V) * 2.457

E ≈ 0.064 V or 64 mV

Thus, the absolute value of the voltage across the biological membrane is approximately 64 mV.

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Answer:

Explanation:

11.535 newtons

Answer:

I'm gonna say it's D

Explanation:

but when u do the experiment on in u head you'll actually find out that it is actually , indeterminable

Wavelength of the incident photon = \(\lambda = 0.025nm = 0.025 \times 10^{-9}m\)

\(\lambda ^{'}-\lambda = \frac{h}{m_{e}c} \times (1- cos\theta )\)

Using the above formula we get Shifting wavelength \(\lambda = 0.027 \times 10^{-9}m\)

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Question:

A photon moving in the +x-direction, scatters off a free stationary electron. The wavelength of the incident photon is 0.0250 nm. After the collision, the electron moves at an angle α below the +x-axis, while the photon moves at an angle θ = 83.3° above the +x-axis. (Assume that the electron is traveling slow enough that the non-relativistic relationship between momentum and velocity can be used.)

(a) Find the shifting Wavelength of the incident photon

Answer:

D

Explanation:

Mgo is ionic and N2 has covalent bonds

The car's speed at the top is 0.6 m/s^2

The diameter of loop d = 40 mm

The radius of loop r = 20 mm = 0.02 m

At the top position, we can write,

Weight and Normal reaction combination will provide the centripetal force i.e.

R + W = mv²/R

R = W [apparent weight = Actual weight]

2W = 2mg = mv2/r

v = √2gr

v = 2 x 10 x 0.02 = 0.6 m/s^2

Hence, the car's speed at the top is 0.6 m/s^2

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An electric charge Q=+6μc is moving with velocity of v=(3.2×10 6 m/s)i+(1.8×10 6 m/s) j.   the B vector at points M=(−0.3 m,+0.4 m,0.0 m) and N=(+0.2 m,+0.1 m,−0.5 m) is  r = (0.2 m)i + (0.1 m)j + (-0.5 m)k. The unit vector along the Z-axis is given by: k = (0, 0, 1)

To find the magnetic field vector at points M and N, we can use the Biot-Savart law. The Biot-Savart law states that the magnetic field at a point due to a moving charge is proportional to the magnitude of the charge, its velocity, and the distance between the charge and the point.

a) To find the magnetic field at points M and N, we can use the following equation:

B = (μ₀/4π) * (q * v x r) / r³

Where B is the magnetic field vector, μ₀ is the permeability of free space, q is the charge, v is the velocity vector, r is the distance vector from the charge to the point, and x represents the cross product.

Substituting the given values, we have:

μ₀/4π = 10^-7 Tm/A

q = 6 μC = 6 x 10^-6 C

v = (3.2 x 10^6 m/s)i + (1.8 x 10^6 m/s)j

r = position vector from the origin to the point (M or N)

For point M, we have:

r = (-0.3 m)i + (0.4 m)j + (0.0 m)k

Using the formula, we can calculate the magnetic field at point M.

For point N, we have:

r = (0.2 m)i + (0.1 m)j + (-0.5 m)k

Using the formula, we can calculate the magnetic field at point N.

b) To determine if the magnetic field is zero at points P and S, we need to calculate the magnetic field at those points using the Biot-Savart law. If the resulting magnetic field is zero, then the field is zero at those points.

For point P, we have:

r = (0.6 m)i + (0.3 m)j + (0.0 m)k

Using the formula, we can calculate the magnetic field at point P.

For point S, we have:

r = (0.2 m)i + (0.0 m)j + (-0.5 m)k

Using the formula, we can calculate the magnetic field at point S.

c) To determine the angle that the magnetic field vector makes with the Z-axis at point N, we can calculate the dot product of the magnetic field vector and the unit vector along the Z-axis, and then calculate the angle between them using the inverse cosine function.

The unit vector along the Z-axis is given by:

k = (0, 0, 1)

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Amphibians retain a set of gills their whole lives that help them to breathe in the water. So, the correct option is D.

Amphibians are defined as the class of cold-blooded vertebrates which is made up of frogs, toads, salamanders, newts, and caecilians. All amphibians that spend part of their lives in water and part of their lives on land.

Amphibians are born with gills, and some outgrow them when they become adults while others retain them for their entire lives.

Thus, the correct option is D.

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Thomson's experiments with gas discharge tubes led to the discovery of the electron, a negatively charged subatomic particle.

This finding was a direct result of his work with cathode ray tubes, which showed that these rays were made of negatively charged particles. This discovery significantly contributed to our understanding of atomic structure.

Thomson observed that the gas in the tubes emitted rays that originated from the cathode (negative electrode) and traveled towards the anode (positive electrode). These rays, now known as cathode rays, exhibited certain properties that led Thomson to propose the existence of a new particle called the electron. Thomson conducted further experiments to study the properties of cathode rays. He found that the rays were deflected by electric and magnetic fields, indicating that they carried a negative charge. By measuring the extent of the deflection, Thomson was able to determine the charge-to-mass ratio of the electron.

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