Imagine that you are comparing three different ways of having a ball move down through the same height. In which case does the ball reach the bottom with the highest speed?.

Answer:

Explanation: because it develops a thin oxide layer on the surface when the metal comes in contact with oxygen. The oxide layer protect the aluminum against corrosion and if damaged it will immediately regenerate in presence of

As we know, Pv= nRT where,

P : pressure

V : volume

n : number of moles

R : constant

T : temperature

According to question PV is constant therefore if balloon floats to a higher altitude where the outside pressure is lower than Volume will increase as a result of Boyle's Law. Therefore Figure C represents the final volume.

What is altitude?

A measurement of altitude or height is the distance between a location or item and a reference datum, often in the vertical or "up" direction. Depending on the circumstance, many definitions and reference points are appropriate.

Therefore,

a balloon is filled with helium gas how would the balloon volume change if it floated to a higher altitude (p decreases, assume n and t are constant)?

As we know, Pv= nRT where,

P : pressure

V : volume

n : number of moles

R : constant

T : temperature

According to question PV is constant therefore if balloon floats to a higher altitude where the outside pressure is lower than Volume will increase as a result of Boyle's Law. Therefore Figure C represents the final volume.

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Answer:i) Energy lost by the water to cool to a temperature of 0°C from 20°C is 16800 J ii) Average rate at which the water is losing energy = 28J/s when specific heat capacity of water = 4200 J/kg K

Explanation: i)The formula used to calculate the energy lost by the water is

Q=mcΔT   where Q= heat or energy lost (or gained), m= mass of the water, c= specific heat capacity of the water, ΔT= [tex]T_{f}-T_{i}[/tex] where [tex]T_{f}[/tex] is the final temperature of the water and [tex]T_{i}[/tex] is the initial temperature of the water

Given, m=0.2kg , c= 4200 J/kg K , [tex]T_{f}=0[/tex]°C and [tex]T_{i}=20[/tex]°C

∴ΔT=[tex]T_{f}-T_{i}=(0-20)[/tex]°C= -20 K                        ∵Change of temperature in celsius = change of temperature in kelvin

∴[tex]Q=[/tex][tex]0.2*4200*(-20)= -16800 J[/tex]                    (minus denotes energy loss)

ANS:Energy lost by the water as it cools is Q=16800 joules = 16800J

ii) formula used to calculate average rate at which the water is losing energy is

average rate of losing energy [tex]=\frac{Energy Lost}{Time}[/tex][tex]= \frac{Q}{t}[/tex]

Energy Lost= Q = 16800 J                                   (from answer (i))

Time taken for water to cool to 0°C = t= 10 min= 10*60 sec= 600 sec

∴Avg. rate of losing energy[tex]=\frac{Q}{t}=\frac{16800}{600}=28 J/s[/tex]

ANS: Average rate at which the water is losing energy is 28J/s

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Answer:

Momentum can be well defined as the measure of the kinetic energy of the object. In simple words, the momentum is the product of mass and velocity.

The magnitude of the normal force that the floor exerts on the crate is 980 N.

The normal force of an object the perpendicular force of the object due to its weight. The weight of the force of the object due force of gravity.

According to Newton's third law of motion, the normal force of an object is equal and opposite to the weight of the object.

Mathematically, the formula for normal force is given as;

W = Fn

mg = Fn

where;

Substitute the given parameters and solve for normal force that the floor exerts on the crate.

Fn = (m1 + m2)g

where;

Fn = (40 + 60)9.8

Fn = (100)9.8

Fn = 980 N

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Answer:

58.01

Explanation:

because this is he answer to the question 019.10

The downtown is 5 miles far away, if the car travels at 10 miles / hour for 0.5 hours.

v = d / t

v = Velocity

d = Distance

t = Time

v = 10 mi / hr

t = 0.5 hr

d = v * t

d = 10 * 0.5

d = 5 mi

Velocity of the car is the rate of change of position of the car. In simple words it can be said as velocity is used to calculate the distance covered in a given amount of time.

Therefore, the downtown is 5 miles far.

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Answer:

Final coordinates in meters : (2.17, -8.6)

Explanation:

We have the equation

displacement  Δd = average velocity x time

In this case there are two components of displacement corresponding to the two components of average velocity

[tex]v_{avg}(x) = 1.70 \; m/s[/tex]

[tex]v_{avg}(y) = -1.50 \; m/s[/tex]

Time traveled is t = 2.60s

So the x component is toward east (+x) axis and y component is due south(-y axis)

[tex]\sf{x \;displacement \;} \Delta_x = v_{avg}(x) x t= 1.70m/s \; \times \; 2.60 = 4.42 m\\\\[/tex]

Since the original x-coordinate was at -2.25m, the end x coordinate is

x =  -2.25 + 4.2 = 2.17

The y-displacement
[tex]\sf{y \;displacement \;} \Delta_y = v_{avg}(y) x t\\\\ = - 1.50m/s \; \times \; 2.60 = - 3.9 m\\\\\\\\[/tex]

The starting y-coordinate was at y = -4.70m

So final y-coordinate = -4.7 - 3.9 = -8.6m

Final coordinates in meters : (2.17, -8.6)

The Point on the x-axis that the net forces from the other two charges acting on a third charge, q°, will be equal to zero is

x=1.72units

This is further explained below.

Generally, The total amount of forces exerted on an item is referred to as its net force. The total of N forces exerted on an item is given in the equation below.

The total force operating on an item, which may include a number of different forces, is known as the net force acting on the object.

The n forces operating on an item are added up in this equation. According to this formula, the amount of net force exerted on an item is equal to the mass times the acceleration of the object.

+3q  <------>+11q

[tex]&\frac{1}{4 \pi E v}\left(\frac{3 q}{x^2}-\frac{11 q}{(5-x)^2}\right)=0 \\\\&\frac{3}{x^2}=\frac{11 q}{(5-x)^2} \\&\frac{5-x}{x}=\sqrt{\frac{11}{3}}=1.91 \\\\[/tex]

5-x=1.91 x

=1.715

=1.72units

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The most likely source of error would be human error such as delay in stopping the stopwatch. The coordination error would be the source of error.

On Earth, the speed of sound as calculated experimentally at sea level assuming a default air temperature of 59 degrees Fahrenheit (15 degrees Celsius) is 761.2 mph (1,225 km/h). The speed of sound is slowed down because gas molecules move more slowly at lower temperatures.

Thus, sound tends to move faster in warmer air.

To explain what speed of sound is, the speed of sound can be described as the distance travelled per unit of time by any sound wave as it propagates through a completely elastic medium.

At 20 °C, temperature the speed of sound in air is about 343 meters per second, or one kilometer in 2.91 s or one mile in 4.69 s.

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The amount of work done, given that the block moved to a distance of 3 m is 38.97 J

Work is defined as the product of force and distance moved in the direction of the force.

Work done (Wd) = force (F) × distance (d)

Wd = fd

Considering angle projection,

Wd = FdCosθ

With the above formula, we can detertmine the work done as follow:

Wd = FdCosθ

Wd = 15 × 3 × Cos 30

Wd = 45 × Cos 30

Wd = 38.97 J

Therefore, we can conclude that the work done is 38.97 J

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Since Two pulses are moving along a string, Mu response is Yes, there be an instance in which the wave interference is at the same level as point X because there will be an overlap  in the way of the slope of the waves.

When two pulses collide to produce a bigger pulse, this is called constructive interference. The two beginning pulses' amplitudes are added to create the size of the final pulse.

Note also that if two waves collide while moving across the same medium, wave interference is the result. The medium assumes a shape as a result of the net impact of the two distinct waves on the medium's particles due to wave interference.

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See full question below

Two pulses are moving along a string. One pulse is moving to the right and the second is moving to the left. Both pulses reach point X at the same instant.Will there be an instance in which the wave interference is at the same level as point X?

He should bow his boat at 90° to cross the river.

While the water will push him in side ways, it will not affect the time it takes to actually cross the river.

Hence, the correct answer is  90°.

Factors that have an effect on the velocity of a river consist of the slope gradient, the roughness of the channel, and tides. Rivers generally tend to drift from a higher elevation to a lower elevation. The gradient is the drop of the elevation of a river.

Reverberation is the time taken for the sound to fall beneath the minimal audibility measured from the immediate whilst the supply stopped sounding. Therefore if the reverberation time will become too massive it produces an echo.

Due to velocity of water drift in river, a person either swimming or floating stationary within the river reports a pushing force alongside the flow direction.

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Radial acceleration is inversely related to the radius of the curved pathway and directly proportional to the square of the linear speed. The ratio of the square of the angular speed to the radius of the curved pathway is directly proportional to the radial acceleration.

This is the acceleration of an object moving at speed v within a circle of radius r. Therefore, as you may have experienced while driving a car, centripetal acceleration is greater at high speeds and in acute curves (smaller radii). y.

We can argue that as the radius increases, the centripetal acceleration of the item moving in a circle falls exponentially. Along the radius, the centripetal acceleration's magnitude diminishes.

The centripetal acceleration would be decreased if the radius were decreased while all other factors remained constant, but it would be increased if the speed were increased while all other factors remained constant.

The radius of the circular path is 10m and the acceleration is 1.5g the speed of the rider is 1.82 m/s/s.

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Magma is the layer of the mantle that moves with the convection current.

Magma is the molten rock that is present in the mantle below the earth's crust. The high amount of heat and pressure inside the earth leads to hot magma that flows in convection currents. These currents cause the movement of the tectonic plates that formed the earth's crust. Mantle convection is defined as the movement of the mantle that transfers heat from one layer to another. The mantle is heated from the lower side but it is cooled from the upper side so the temperature decreases over long periods.

So we can conclude that the layer of the mantle that moves with the convection current is the magma layer.

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The average speed in miles per hour is 65 mph.

Total distance d = 2275 miles

Total time t = 45 hours

To calculate average velocity

v = d/t

where v is velocity, d is distance and t is time.

v = 2275/45

v = 65 mph.

Thus, the average speed in miles per hour is 65 mph.

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Answer:

5.1 m

Explanation:

Assuming gravitational force is 9.8 m/s², the acceleration experience by the ball is -9.8 m/s²

The acceleration is negative because the ball is moving vertically upward and gravitational force acts vertically  downward.

The velocity of the ball at maximum height is 0 m/s when it will start falling back to ground at a positive acceleration of 9.8 m/s²

We can use the following formula to calculate the height the ball reaches

v² = u² + 2 a  d

where u is the initial velocity, v = final velocity, a = acceleration and d = displacement(in this case the vertical height from ground)

Final velocity is 0 since the ball has reached it maximum height and starts falling downward, Initial velocity u = 10 m/s

Plugging in values we get
0² = 10² - 2  x 9.8 x d

0 = 100 - 19.6d

Subtracting 100 from both sides

-100 = -4.9 d

Divide by -1 both sides
100 = 4.9d

d = 100/4.9 ≈ 5.1 m

So the ball will reach a height of 5.1m

The ball will take 8.6 sec to reach the 98m mark.

Given,

The initial position of the ball = 12m

The final position of the ball = 98m

The velocity of the ball = 10m/s

The displacement of the ball = (98-12)

= 86m

We know,

Average velocity = Displacement/time

Therefore,

Time = Displacement/velocity

= 86/10

= 8.6 sec

So, the ball will take 8.6 sec with average velocity of 10m/s to reach the mark of 98m from initial position of 12m.

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When the angle between the force and the displacement is more than 90 degrees, work might be negative. It can also be zero; if = 90, this will occur.

The spring force, which defines the force applied to an object by the end of an ideal spring, is the most well-known illustration of a force whose value varies on position. An ideal spring will exert a force on the object attached to one end that is proportionate to how much it is stretched, and a force that is proportional to how much it is compressed on the object linked to the other end.

The force must function in order to accomplish its mission have a component that is parallel to the motion's direction or the opposite.

We must compute an integral (a sum) to determine the work done if the force acting on the object is not constant while it is moving.

Assume that an external force with the x component Fx(x) is acting on the object, causing it to travel in a straight line (let's say along the x axis, from xi to xf). (Or, we understand the force Fx to be a function of x.)

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an angled v-tube Theta theta is open to the atmosphere at point a and contains some viscous liquid outside. The v-tube is HH in height. The speed at which the v-tube rotates along axis ab is variable. Assume that PP0 is the atmospheric pressure.

Atmosphere

An atmosphere is a subcaste of gas or layers of feasts that wrap an earth and are held in place by the gravity of the planetary body (from Ancient Greek: "atmós" "vapour," "brume," and "sphaîra" "sphere"). When the graveness is strong and the temperature of the atmosphere is low, the earth keeps its atmosphere. The outer portion of a star, known as its astral atmosphere, is made up of the layers above the opaque photosphere; low-temperature stars may have astral atmospheres that contain emulsion motes.

Nitrogen (78), oxygen (21), argon (0.9), carbon dioxide (0.04), and trace gases make up the Earth's atmosphere.

Most species utilize oxygen for respiration, while shops, algae, and cyanobacteria use carbon dioxide for photosynthesis. Lightning and bacteria use nitrogen obsession to manufacture ammonia, which is used to synthesize nucleotides and amino acids. The atmosphere's stratified structure reduces the dangers of the sun, UV radiation, solar wind, and cosmic shafts to protect species from irreparable harm. The biochemical modification of the pale atmosphere by living beings billions of times has led to the makeup of the Earth's atmosphere as it is now.

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Both solenoids and electromagnets produce magnetic fields using electric current and coiled wires. The correct option is A

An electromagnet can be defined as a type of magnet in which the magnetic field is produced by an electric current.

Electromagnets usually consist of wire wound into a coil.

Both solenoids and electromagnets produce magnetic fields using electric current and coiled wires.

The simple arrangement and construction of electromagnets requires an insulated copper wire, iron rod and battery.

Electromagnets has some advantages which includes :

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The particles of a solid are in fixed positions, the particles of a liquid do not translate to a large extent while the particles of a gas has extreme degree of freedom.

We have to refer to the kinetic molecular theory at this point. We would recall from the theory that the particles that compose a substance are said to be in a constant random motion. As such, the molecules of a gas do have the greatest degree of freedom thus they move about freely. On the other hand, the molecules that compose a solid have the least degree of freedom as they remain in their fixed positions and can only vibrate.

Billiard balls are free to have about and they move at high speeds since they are spaced from each other. This is the nature of the interaction between the molecules of a gas.

Students in a hall way that is crowded can be used to approximate liquid particles because they do not posses a high degree of freedom but the molecules could move a few inches away from each other.

For a solid. an apt approximation is the  audience in a movie theater. This is because, they can only remain on their seats just as the particles in a solid retain a fixed position and do not translate.

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Answer: Purple because it is greater than the red in mass and the more mass and the more mass it is the stronger it would be to have a change in velocity.

Explanation:

Answer:

Crash 2

Explanation:

The force on purple paddle was stronger, so the force on the puck has to be stronger

The work done by friction W = (F1 - mg sin θ) L,   W = -μ  mg cos θ L.

Use Newton's Second Law to find the force of friction. In these tasks, the X-axis will be parallel to the plane and the Y-axis will be perpendicular to the plane:

Y-Axis  

N -  =[tex]w_{y}[/tex]

N = W_{y}

X axis

F1 - fr - Wₓ = 0

fr = F1 - Wₓ

Let's use trigonometry to find the components of the weight

sin θ = Wₓ / W

cos θ = W_{y} / W

Wₓ = W sin θ

W_{y} = W cos θ

We substitute

fr = F1 - W sin θ

Work is defined by

W = F .dx

W = F dx cos θ

Since the friction force is in the negative direction parallel to the plane and the displacement along the plane is positive, the angle is 180° and cos θ = -1

W = -fr x

W = (F1 - mg sin θ) L

Another way to calculate is

fr = μ N

fr = μ W cos θ

the work is

W = -μ  mg cos θ L.

Zero work can occur in any of the following situations When a single force is applied but no displacement. There are gaps but the power of the individual is not showing. A single force is applied in a direction perpendicular to the direction of displacement.

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Answer:

Acceleration 0.238 m/s²

Explanation:

Given:

V₀ = 13.2 m/s

V = 15.1 m/s

t = 8.00 s

__________

a - ?

Is the acceleration of the object:

a = (V - V₀) / t

a = (15.1 - 13.2) / 8.00 ≈ 0.238 m/s²

Acceleration of the object is 0.238 m/s²

Acceleration of an object is rate of change of velocity with respect to time. Due to having both direction and magnitude, it is a vector quantity of SI unit meter/second².

Given parameters:

Initial velocity; V₀ = 13.2 m/s

Final velocity; V = 15.1 m/s

time; t = 8.00 s

acceleration of the object; a = ?

We know, for accelerated object;

acceleration; a = (V - V₀) / t

⇒a = (15.1 - 13.2) / 8.00 ≈ 0.238 m/s²

Hence, acceleration of the object is 0.238 m/s².

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A rock climber stands on the top of a 53 m high cliff overhanging a pool of water, so for 3.1 seconds, after which the second stone hit the water.

The overall distance the object covers in a given amount of time is its average speed. The scalar quantity represents the average speed. It does not have direction; it is represented by magnitude.

Average Speed= [tex]Total\ Distance/ Total\ time[/tex]

According to the question, the given values are :

v₁ = 1.5 m/s

y₂ = 52 m

y₁ = 0 m

Acceleration, a = 9.8 m/s²

Use Formula :

y₂ = y₁ + v₁t + 0.5 at²

52 = 0 + 1.5t + 0.5 (9.8)t²

4.9 t² + 1.5 t - 52 = 0

[tex]t=-b\frac{+}\ \sqrt{b^2-4ac}/2a[/tex]

t = -1.5 + [tex]\sqrt{2.25+1019.2}[/tex]/9.8

t = (-1.5 + 31.9)/9.8

t = 3.10 seconds.

Hence, the time period will be 3.10 seconds.

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Answer

(D) the vectors must be the same size and pointing opposite to each other

Answer: 40 km/hr ( c )

Explanation:

Distance =20 km

Time =30 min=

60

30

​

hr=

2

1

​

hr

∴ Speed =

time

Distance

​

=

(

2

1

​

hr)

20 km

​

⇒ Speed =40 km/hr

Option (C) is correct.