A child boards a bus for summer camp. His mom is waiting next to the bus. The bus begins
moving 3 m/s east with respect to the ground. The child is walking 0.5 m/s west towards the back
of the bus with respect to the bus. The mother begins running 1 m/s east with respect to the
ground, chasing after the bus and thoroughly humiliating her child. What is the child's velocity

a) relative to the ground?

b) relative to the mother?

The temperature of the Earth is determined by the amount of solar radiation received, the amount of solar energy reflected, and the amount of heat retained by the atmosphere.

What is temperature?
The physical concept of temperature expresses in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined various reference points as well as thermometric substances. The most popular scales are the Celsius scale, also known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), as well as the Kelvin scale (K), with the latter being primarily used for scientific purposes. One of the International System of Units' seven base units is the Kelvin (SI).

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In between the two processes, we can see that the thermal energy of the mixture increases.

Recall that energy is the ability to do work. Now when we add the  partially melted to form a mixture of ice and ice water, we are going to increase the thermal energy of the water. This is because the water in the liquid state has a greater energy than water in the solid state.

Having see that liquid water contains more energetic particles than the the solid water, the thermal energy has increased in between the two processes.

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The distance travelled due east during the trip is 875.831 meters.

The distance due west is 6.44 km (6440m) and the velocity due west is 2.6m/s. The velocity due east is 0.465m/s.

We know,

Average velocity = Total displacement/Total time

It is given that, the total average velocity is 0.465m/s.

If distance in west is W and the distance in east is E, then the displacement D is,

D = √((6440)²+(E)²)

The time T₁ in west,

T₁ = 6440/2.6 seconds

Time time T₂ in east,

T₂ = E/0.465

The total time T is,

T = T₁ + T₂

T = 6440/2.6 + E/0.465

So, putting all the values now,

Average velocity = D/T

1.37 = √((6440)²+(E)²)/(6440/2.6 + E/0.465)

On solving it further,

We get,

E = 875.831 meters.

So, the distance in east is 875.831 meters.

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The average acceleration for that time interval will be zero because the velocity is constant.

If an object's velocity changes, it is said to have been accelerated. An object's velocity can alter depending on whether it moves faster or slower or in a different direction. A falling apple, the moon orbiting the earth, and a car stopped at a stop sign are a few instances of acceleration. Through these illustrations, we can see that acceleration happens whenever a moving object changes its direction or speed, or both.

Velocity and speed describe how quickly or slowly an object is moving. We frequently encounter circumstances when we must determine which of two or more moving objects is going faster. If the two are travelling on the same route in the same direction, it is simple to determine which is quicker. It is challenging to identify who is moving the fastest when their motion is in the other direction. The concept of velocity is useful in these circumstances. Learn about the definition of velocity in this article as well as the distinction between speed and velocity.

the velocity is constant at -20 m/s. Hence the average acceleration for that time interval will be zero because the velocity is constant.

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Answer:

0

Explanation:

i did it on khan academy

To find the voltage of the combined drops, we can just add the voltage of both drops together.

2(235.15) = 470.3 Volts

r - Radius

h - Height

1. Area of a circle = π×r²

2. Circumference of a circle = 2×π×r

3. Volume of a cylinder = π×r²×h

A region's size on a plane or curved surface is expressed by the term "area," which is a mathematical concept. As opposed to surface area, which refers to the area of an open surface or the boundary of a three-dimensional object, plane region or plane area refers to the area of a form or planar lamina.

The circumference of a circle or ellipse in geometry is its perimeter. That is, if the circle were opened up and straightened out to a line segment, the circumference would be the length of the arc. The curve length around any closed figure is more often referred to as the perimeter.

A cylinder is one of the most basic curvilinear geometric shapes and has traditionally been a solid in three dimensions. It is regarded as a prism with a circle as its base in basic geometry. In several contemporary fields of geometry and topology, a cylinder can alternatively be characterized as an infinitely curved surface.

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The correct answer is option A.

To stop your vehicle when the brakes fail, work the parking brake gradually to prevent locking up the wheels and sending the car out of control.

Due to advanced technology, a complete brake failure has never occurred. However, there is the possibility of an unlikely scenario while driving your vehicle.

If you ever come across such an unfortunate situation where a brake failure occurs in your vehicle while driving here is the advice to act upon.

The few things which are essential to do are:

Keep pressing the brake pedal

Gradually pull down on the parking brake of your vehicle.

If it does not work, shift your attention to the lower gear and make sure one gear at a time to slow down your vehicle.

Drive into less hazardous areas make sure there are no people around you and do not turn off your engine until your vehicle is completely stopped.

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A star's twinkling is caused by light from the star being refracted by the earth's atmosphere.

What is stars?
An astronomical object known as a star is made up of a luminous plasma spheroid that is held together by gravity. The Sun is the star that is closest to Earth. Other stars are also visible at night with the unaided eye, but due to their great distances from Earth, they appear as stationary points of light. Many of the brightest stars have names, and the most notable stars have been grouped into constellations and asterisms. Star catalogues have been put together by astronomers that list the known stars and offer standardised stellar designations. An estimated 10^22–10^24 stars are present in the observable universe. Only 4,000 of these stars can be seen with the unaided eye, and they are all located in the Milky Way galaxy.

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The force constant of the spring is 2,717 × [tex]10^{3}[/tex] N/m

To solve this problem, we should understand Hooke's Law. According to this law, the displacement or magnitude of a deformation is directly proportional to the deforming force or load for relatively modest deformations of an item. Mathematically, Hooke's Law could be stated in a form of equation as written below.

[tex]F = k[/tex] Δ[tex]x[/tex]

where [tex]F[/tex] is the force, [tex]k[/tex] is the spring constant, and Δ[tex]x[/tex] is the displacement.

In this question, we have already known the value of force (as a result of multiplication between weight of the load and gravity value) and displacement.

[tex]F = 178 N[/tex]

Δ[tex]x[/tex][tex]= 0.0655 m[/tex]

By using the formula of Hooke's Law, we could calculate the value of spring constant.

[tex]F = k[/tex] Δ[tex]x[/tex]

[tex]k=F/[/tex]Δ[tex]x[/tex]

[tex]k = 178 N / 0.0655[/tex]

[tex]k = 2717 N/m[/tex]

[tex]k = 2,717[/tex] × [tex]10^{3} N/m[/tex]

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If the fusion rate in the core of the sun were increased but the core couldn't  expand then The Sun’s core would start to cool down and the rate of fusion would decrease.

When the core of sun is increased in that scenario, the reaction rate would in fact speed up and produce more energy, but the heat would also lead to a rise in pressure. The Sun would expand because the upward pressure force would outweigh the downward gravity force.

What is fusion?

A reaction known as fusion occurs when two or more atomic nuclei unite to create new atomic and subatomic particles (neutrons or protons). Energy is released or absorbed depending on how much mass there is between the reactants and products.

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Answer:

a black or dark viscous substance obtained as a residue in the distillation of organic materials and especially tars

Explanation:

Given, Speed of the sound, v=675 m/s

The wavelength of the wave, λ=15 m

Relation between speed, wavelength, and frequency of a wave is given by

Where f is the frequency of the sound.

On substituting the known values,

Which gives us,

Therefore the frequency of the sound in the given medium is 45 Hz.

The forces have a same magnitude, act in opposing directions, and result in a net force of zero. The forces produce a net force in the direction of motion that is in the same direction, but they are not equal in size.

All forces operating on an automobile travelling uniformly at a steady speed are balanced. In this instance, the two opposing forces air resistance and friction perfectly balance the force that the wheels are exerting on the ground. However, the instant your foot leaves the gas pedal, there is no longer an applied force, and the forces are out of balance: Now when the car is out of balance, the forces pushing backward on it cause it to slow down; this is known as negative acceleration.

Because there wasn't enough upward force (i.e., regular force from the chair) to balance the extra mass, you would speed downward as a result of the unbalanced force, possibly breaking your tailbone as you plunged through the chair to the floor.

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The propagation delay of the link due to time dilatationis 1.152 x 10¹⁶ s.

We need to know about the time dilatation to solve this problem. Time dilatation represents that time is relative between the moving and static objects.  From a static objects point of view, the time should be

t' = t / √(1 - v²/c²)

where t' is the interval time based on the static object, t is the interval time based on the moving object, v is velocity and c is the speed of light (3 x 10⁸ m/s),

From the question above, the given parameters are

v = 2.4 x 10⁸ m/s

D = 3.6 x 10⁷ m

Find the time taken based on moving objects

t = 2D . v

t = 2 . 3.6 x 10⁷ . 2.4 x 10⁸

t = 1.728 x 10¹⁶ s

Find the time interval based on static objects

t' = t / √(1 - v²/c²)

t' = 1.728 x 10¹⁶ / √(1 - (2.4 x 10⁸)²/(3 x 10⁸)²)

t' = 2.88 x 10¹⁶ s

Hence, the delay time is

Δt = t' - t

Δt = 2.88 x 10¹⁶ - 1.728 x 10¹⁶

Δt = 1.152 x 10¹⁶ s

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Answer:

I would use physical properties to identify each substance because anything with the same physical properties as previous substances in the past.

Explanation:

pls mark brainliest with the crown. I need more to level-up

The value of electric field is 2.247 V/m. Yes, the observed value and calculated values of electric field match.

The electric field will be calculated using the formula -

E = kq/r². In this formula, E stands for electric field, k represents constant of proportionality, q is the charge of electron and r is the distance. As per the known fact, the value of k is 8.89×10⁹ N m²/C² and value of q is 1.6×[tex] {10}^{ - 19} [/tex] C.

Keep the values in formula for calculation of electric field.

E = (8.89×10⁹ × 1.6×[tex] {10}^{ - 19} [/tex])/2²

Taking square in denominator

E = (8.89×10⁹ × 1.6×[tex] {10}^{ - 19} [/tex])/4

Performing multiplication and division

E = 2.247 V/m

Thus, the observed and calculated electric field is 2.247 V/m, which is equal in both the cases.

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The complete question is attached in the diagram.

The water molecules in the gas phase have more kinetic energy than in the liquid phase. The molecules in the liquid phase must absorb energy from the surroundings to enter the gas phase.

A hot spring can be defined as a natural or an artificially-induced phenomena in which very hot groundwater flows out from the Earth's crust due to the heat energy that is present in the geosphere.  

A phase change simply refers to the change in the state (phase) of matter of a given chemical compound or substance in the following ways:

Generally speaking, the water molecules in the gas phase typically possesses more kinetic energy than in the liquid phase and as such, it would have to absorb more energy from the surroundings in order to enter the gas phase.

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The distance between the points A and B is 6000 miles.

Let us assume that the distance between the points a and b is D.

Now, we know, airplane takes 4 hours and 48 minutes to move from a to b and back with no wind

Let us say the speed of the airplane is V.

So, we know,

Average Speed = total distance/total time

The distance between a to b and back is 2D.

So, we can write,

V = 2D/4.8

2D = V(4.8)

With wind of speed V'=100mph, it take 5 hours for the airplane to go from a to b ane back.

The average velocity of airplane in wind is,

V + V' = 2D/5

Putting value of 2D,

V + V' = V(4.8)/5

5(V + 100) = 4.8V

5V + 500 = 4.8V

0.2V = -500

V = -2500mph

The negative sign only means that we have taken the opposite direction, so that is not a problem and we can ignore it,

So,

We know,

2D =V(4.8)

D = 2500(4.8)/2

D = 6000 miles.

So, the distance between the two points is 6000 miles.

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The acceleration of greyhound's is 0 m/s².

We need to know about the uniform motion to solve this problem. The uniform motion is an object's motion under acceleration. It should follow the rule

vt = vo + a . t

vt² = vo² + 2a . s

s = vo . t + 1/2 . a . t²

where vt is final velocity, vo is initial velocity, a is acceleration, t is time and s is displacement.

From the question above, we know that

s = 49 m

vo = vt = 15 m/s

Find the acceleration

vt² = vo² + 2a . s

15² = 15² + 2 . a . 49

a = 0 m/s²

The acceleration is zero because the constant speed.

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A student learns that a certain comet in the solar system is considered a short-period comet. Based on this knowledge, the student most justified in concluding The comet originates between the Sun and the asteroid belt.

The Solar System's asteroid belt is a torus-shaped area roughly midway between the orbits of Jupiter and Mars. Asteroids or minor planets are the names for the vast majority of solid, irregularly shaped entities that are far smaller than planets. The term "primary asteroid belt" also applies to this asteroid belt.

A comet is a tiny, frozen object in the Solar System that begins to outgas when it approaches the Sun. Outgassing is the process through which gases are released from the comet.

The orbital durations of comets differ widely, from a few years to possibly millions of years, and they often have very eccentric elliptical orbits. The Kuiper belt or its related scattered disc is the source of short-period comets.

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It is best to choose option B. When a star runs out of fuel, it can no longer undergo the merger process and dies. The primary elements of stars are helium and hydrogen.

A white dwarf star's maximum mass is determined by Chandrasekhar's limit, a sort of maximum restricted value. The Chandrasekhar limit is often valued at 1.44 times the mass of the sun, or around 2.765 1030 kg, on a global scale.

In other words, the Chandrasekhar limit is the highest figure that may possibly reach 1.44 times the mass of the sun.

When a high-mass star runs out of gas to burn, it enlarges and changes into a red supergiant. While the bulk of stars gradually fade away, the supergiant stars, often known as supernovae, demolish themselves in a massive explosion. New stars can develop as a result of massive stellar deaths.

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The combination of processes through which the stew is being warmed include conduction, convection and radiation.

Heat transfer is defined as the phenomenon whereby heat generated in a medium is being transferred to another location by phase changes.

The transfer of heat occurs in the following combination processes such as:

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Answer: the acceleration is 63737737ey

the velpcoty is is 7-922=2929

the acceleration down is 99102>2929<92

Explanation: because when the ball goes up it has to come down due to gravity, physics, and your very kind and nice mother. I hope this helped you! i bet you will ace this assignment.

The material that finally worked in developing the light bulb is

Carbonized cardboard/ filament.

The formation of the light bulb was an important contribution to physics and mankind. However, various experiments were conducted in different labs to produce a light bulb.

The scientists of the olden times were having trouble in finding a material that could burn for a long and not have such a short lifespan.

It was the lab in which Thomas Edison worked that first used carbonized carbon filament in the light bulb. Their research proved to be a breakthrough because carbon filaments have a longer lifespan and burned effectively when electricity was provided.

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The substance added to gasoline and found in the wells of people who live miles from a gas station is an example of non-point source of pollution.

Point source pollution are sources of pollution, radiation, waves, fluid or other substance that has one specific location.

On the other hand, non-point source pollution is a combination of pollutants from a large area rather than from specific identifiable sources such as discharge pipes.

According to this question, a substance added to gasoline is found in the wells of people who live miles from a gas station. This suggests that the pollutants enter from a wide array of sources.

Therefore, it can be said that the source of pollution is a non-point source.

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Answer:

Explanation:

Elements   Atomic No.   Mass No.   Proton No.    Electron No.   Neutron No.
Na                 11                   23                11                    11                     12


Cl                  17                   35               17                    17                     18


Ar                  18                  36                18                   18                     18


Ca                 20                 40                20                  20                    20


Atomic number = Proton number
Electron number = proton number
Mass Number = proton no. + neutron no.
Neutron number = Mass no. - proton no.

When a ladder with 20 ft. long is pulled along the floor away with a constant rate 1.2 ft/s, then the top of the ladder is moving toward the floor with velocity - 0.9 ft/s and there is no acceleration.

Let:

x = the distance between the bottom of the ladder from the wall

y =  the distance between the top of the ladder from the floor

When x = 12 ft, then using the Pythagorean Theorem:

x² + y² = 20²    (Equation 1)

12² + y² = 20²

y² = 20² - 12² = 16²

y = 16 ft.

Take the derivative of equation 1 with respect to t

2x . dx/dt + 2y. dy/dt = 0

Substitute x = 12, y = 16, dx/dt = 1.2 ft/s

2 . 12 . (1.2) + 2 . 16 . dy/dt = 0

dy/dt = - 0.9 ft/s

Hence, the velocity is - 0.9 ft/s

Since the floor is moving with a constant rate, the acceleration is zero.

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Option D is correct. In venturi meter a converging section of a pipe is used to increase the flow velocity and corresponding pressure drop, from which the fluid flow rate is calculated using Bernoulli's equation.

A venturimeter is a flow measurement device. The meter is connected between two sections of the pipe; the cross-sectional area A of the meter's entrance and exit corresponds to the cross-sectional area of the pipe. The fluid flows from the pipe with speed V between the entrance and exit, and then through a narrow throat with cross-sectional area a with speed v. A venturi works by measuring the difference in pressure between two points. The pressure difference is created by narrowing the pipe, causing the fluid to flow faster. In the larger section of the venturi, the fast moving fluid has a lower pressure than the slower fluid.

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Answer: 1h

Explanation:

The average acceleration of the hockey puck is 1.5172m/s² and the hockey puck travels 110.65 meters in the interval of 5.8 seconds.

The initial velocity of the player is 14.7m/s. The final velocity of the player is 5.90 m/s.

The time taken during the change of velocity is 5.8 seconds.

a) Average acceleration A of tha player,

A = ∆V/∆t

∆V total change in velocity,

∆t total change in time,

So, we can write,

A = 5.90-14.7/5.8

A = 1.5172m/s².

So, average acceleration is 1.5172m/s².

b) To find the distances travelled in the 5.8 second,

We can use the equation of motion,

S = Ut+1/2At²

U is initial velocity,

A is average acceleration,

t is the time,

S is the distance travelled,

Putting all the values,

S = 14.7(5.8)+1/2(1.51)(5.8)²

S = 110.65 meters.

So, the player travel 110.65 meters.

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