How to brought people or myself out of sadness?

The final velocity of the rock before hitting the ground is 34.42m/s

Velocity of an object can be said as, the rate of change of displacement with respect to time of an object . Its unit is m/s and it is a vector quantity.

V = Δx/Δt

In here , V is velocity ,  Δx is change in displacement and Δt is change in time of an object.

We are given that,

The rock thrown downward with initial velocity = (-u) = -20m/s

The height of the building before and after hitting the ground = -Δy = -40 m

Therefore , to get the value of the final velocity (v) of the rock before hitting the ground , then the equation of motion cab be written as,

v² = u² + 2a(Δy )

Here , (a) is the acceleration due to gravity and taken negative (-9.81m/s²) due downward direction of the building then putting all the values in above equation of motion ,

v² = (-20m/s)² + 2(-9.81m/s²) (-40m)

v² = 1184.42m/s

v = 34.42m/s

Hence, the final velocity of the rock before hitting the ground would be 34.42m/s .

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Answer:

"the maximum extent of a vibration or oscillation, measured from the position of equilibrium."

hope this helps

Answer:

amplitude and physics the maximum displacement or distance moved by point on a vibrating body or wave measured from its equilibrium position it is equal to 1/2 of the length of the vibration path

Air pressure inside the balloon is 0.143 N/m²

PRESSURE : force applied perpendicular to the surface of object per unit area.

GIVEN -

Radius =  5.0m

Force = 45N

Air pressure inside the balloon is given by

       [tex]P = \frac{F}{A}[/tex]

Where

P = Pressure

F = Force

A = Area

Surface area of the sphere  = 4πr²

r is the radius of sphere

A = 4 ×3.14×(5)²

A = 314 m²

P = F/A

P =  45/314

P =  0.143 N/m²

Air pressure inside the balloon is 0.143 N/m²

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Answer:

a. 1/1000 sec

Explanation:

Shutter speed is the length of time that the film you’re photographing is being exposed to the scene in film photography. However, in digital photography, shutter speed is the length of time that the image sensor sees the scene the photographer is trying to capture.

For shutter speeds, the greater the denominator the higher the speed and the lower the denominator, the lower the speed.

Thus, the fastest one is option A.

The fastest shutter speed is represented as : ( D )  1/2000 sec

To determine the fastest shutter speed we have to the consider the numerator and denominator values of the given expression representing the relationship between the shutter speed and length of time. The greater the denominator the faster the shutter speed.

Therefore from the options listed the fastest shutter speed would be 1/2000 sec

Hence we can conclude that the fastest shutter speed is represented as 1/2000 sec.

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As a result, it is a noise without a pitch or wavelength. When the time comes, part of it is incidental and radiates away from you in all directions.

Following that, there is a temporal delay of 60 cm, or 0.6 m divided by 340 m/s, or 0.002 seconds. This is the amount of time it takes for the sound impulse to travel from one riser to the next. Any material will now reflect a significant portion of the sound that reaches it, and the reflected wave will sound substantially different from the shop. first sound. If there are 20 rows of seats and you hear a tone with 20 crests coming from the stands,

We are informed about this sound wave problem that a loud, sharp sound is produced in the middle of a field in an empty stadium. We hear an echo with a distinct pitch but no frequency or Waveland in the pulse.

Now that the sound has been accounted for, we need to estimate its frequency, wavelength, and duration in terms of orders of magnitude. We will now graph the air pressure versus time and model the Lord Sharp sound impulse as a single narrow peak.

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Answer:

Speed is 0 m/s.

Distance is 200 meters.

Explanation:

In this scenario, we can treat speed as the absolute value of velocity and distance as absolute value of displacement since we are dealing with one-dimensional motion.

There’ll only exist one component of vector, by applying magnitude formula, it’ll return value as shown below:

Suppose we have a one-dimensional vector, [tex]\displaystyle{\vec v = 5\hat i}[/tex], this represents a vector with magnitude of [tex]\displaystyle{|\vec v | = \sqrt{5^2} = 5}[/tex].

Theorem I - Magnitude of One-Dimensional Vector

Suppose we have a vector [tex]\displaystyle{\vec v = a\hat i}[/tex] then the magnitude is [tex]\displaystyle{|\vec v| = \sqrt {a^2} = |a|}[/tex].

Speed and distance both are scalar quantity which means they only have magnitude but lack the direction. In one-dimensional motion, speed is defined to be the absolute value of velocity and direction is defined to be the absolute value of displacement, the reason is shown above regarding one-dimensional vector.

An example would be, consider a car moves at velocity of -4 m/s, this means that a car just moves to negative direction or opposite direction of positive at 4 m/s. The negative and positive sign refer to the direction that an object moves, to know how fast they are moving, we consider its magnitude which is speed.

This can also be said same to displacement and distance, but be aware that this can only be applied to straight horizontal or vertical line movement or else the motion will become two-dimensional.

From the problem, there’s no specific distance or displacement’s graph so we will assume that the car is moving in straight horizontal line. The car is moving at speed of 40 m/s and decelerates at 4 m/s².

This means that our acceleration is -4 m/s² since it’s decelerating and is moving at 40 m/s from start. Therefore, we can apply a general physic formula which is:

[tex]\displaystyle{v = u+at}[/tex]

Where v is final velocity, u is initial velocity, a is acceleration and t is time. As said, we can treat speed = positive velocity in this scenario so substitute u = 40 m/s and a = -4 m/s² in the formula.

[tex]\displaystyle{v=40-4t}[/tex]

Now substitute t = 10 in the formula:

[tex]\displaystyle{v = 40-4(10)}\\\\\displaystyle{v=40-40}\\\\\displaystyle{v=0 \ \sf{m/s}}[/tex]

Therefore, the speed of car at 10 seconds is 0 m/s, it’s not moving at this moment.

Next, we find distance which we can use the following formula:

[tex]\displaystyle{s = ut + \dfrac{1}{2}at^2}[/tex]

Substitute u = 40, t = 10 and a = -4 in:

[tex]\displaystyle{s=40(10)+\dfrac{1}{2}(-4)(10)^2}\\\\\displaystyle{s = 400-2(100)}\\\\\displaystyle{s=400-200}\\\\\displaystyle{s=200 \ \sf{m}}[/tex]

Therefore, in 10 seconds, it’ll be able to travel 200 meters.

   The value of the acceleration of the earth toward it when it accelerates toward the earth with 9.8m/s² is a = 7.35×10-²³m/s².

  Acceleration is defined as the second derivative of displacement or the derivative of velocity:

a = d/dt(dS/dt) = dV/st.

   It is the rate of change of velocity, it generates a constant change over time.

   Forces are the definition of Newton's second law, which is stated under the relation:

∑ Force = mass × acceleration.

  In other words, force is the origin of motion since it generates acceleration in a system.

   In this case we must complete the statement:

"A student with mass 45 kg jumps off a high diving board. Using 6. 0×1024 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9. 8 m/s2 ? assume that the net force on the earth is the force of gravity she exerts on it."

  We determine the Force of the student:

F = ma

F = 45kg * 9.8m/s².

F = 441N

  Now we go to the acceleration of the earth:

a = F/m

a = 441N / 6×10²⁴ Kg

a = 7.35×10-²³m/s².

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According to sound power level, 80 decibel sound has greater intensity.

We need to know about sound power levels to solve this problem. The sound power level can be defined by a decibel unit. The decibel unit is proportional to the logarithm intensity ratio. It can be written as

dB = 10 log(I1 / I0)

where dB is sound power level, I1 is sound intensity and I0 is reference sound intensity (10¯¹² W/m²)

From the question we know that

Ia = 60 dB

Ib = 80 dB

Because the decibel unit is proportional to the logarithm intensity ratio, the sound with greater decibel will have greater intensity.

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The model house on remote renewable energy will generate (20mmm + 30sss) kilowatt-hours of energy in 10 years.

Given:

Remote Renewable House= 2 windmills + 3 turbines

1 windmill generate mmm kilowatts-hours in a year

Therefore,

2 windmills will generate,

2×mmm=2mmm kwh in a year

In 10 years, 2 windmills will generate

10×2mmm=20mmm

1 solar panel generate sss kilowatt-hour each in 1 year

3 solar panels will generate yearly

3×sss=3sss

In 10 years, 3 solar panels will generate

10×3sss=30sss

Therefore, the total energy generated in the renewable model house is in 10 years

(20mmm+30sss)  kwhr

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The force on each side of the loop is [tex]2.26\times10^{-4}N[/tex] away from the centre .

It is given that solenoid has 30.0 turns/cM which means we have given number of turns per unit length [tex]n=\frac{N}{L} =30\times10^{2}m[/tex] and carries a clockwise current of 15.0A .

Putting above values in equation (1) , we get

[tex]B=4\pi \times10^{-7}\times 30\times10^{2} \times15.0\\B=0.0565T[/tex]

The magnetic force exerted due to their magnetic field on the sides of the loop will be away from the center of loop and is given by equation (2) .

It is given that current in the loop is  0.200 A and length of the each side of the loop is  2.00 cm [tex]=2\times10^{_2}m[/tex] and plane of the loop perpendicular to the magnetic field of the solenoid.

Putting above values in equation (2) , we get

[tex]F=0.0565\times0.2\times2\times10^{-2}\times sin90\\F=2.26\times10^{-4}N[/tex]

Direction of force is found by Fleming' Left Hand rule which states that when the thumb, index finger and middle finger of the left hand are placed perpendicular to each other,  the thumb points in the direction of the magnetic force, the index finger points in the direction of the magnetic field, and the middle finger points in the direction of the flow.

According to Fleming's left hand rule, the magnetic force exerted due to their magnetic field on the sides of the loop will be away from the center of loop and is given by equation (2) .

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The shuttlecock that is kicked upward from the roof edge of a tall building at the speed of 4m/s after 3s will have a velocity of: -25.4 m/s (the value is negative due to the object is going down)

The formula for the vertical launch upward and the procedure we will use is:

vf = v₀ - g * t

Where:

Information about the problem:

Applying the final velocity formula we get:

vf = v₀ - g * t

vf = 4 m/s - 9.8 m/s² * 3 s

vf = 4 m/s - 29.4 m/s

vf = -25.4 m/s

this negative value indicates that the object is going down

In physics vertical launch upwards is the motion described by an object that has been launched vertically upwards in which the height and the effect of the earth's gravitational force on the launched object are taken into account.

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The plane's horizontal and vertical velocity components are 33.65 m/s and 53.85 m/s respectively.

What is velocity ?

velocity is defined as rate of change of displacement d of the object with respect to rate of change in time t. In mathematics It is written as :

v = d/t

it should be noted that, velocity is nothing but speed in particular direction. That is velocity is vector quality having both magnitude and direction where as speed is just the magnitude of velocity.

It is given that :

A plane moves with a velocity v of 63.5 m/s at 32 degrees South of East with the horizontal.

Therefore, the planes horizontal velocity components will be :

v₁ = vsinθ

v₁ = 63.5 x sin 32⁰

v₁ = 33.65 m/s

the planes vertical velocity components will be :

v₂ = vsinθ

v₂ = 63.5 x cos 32⁰

v₂ = 53.85 m/s

Therefore, the plane's horizontal and vertical velocity components are 33.65 m/s and 53.85 m/s respectively.

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Answer: Regarding the image posted, a unicellular paramecium relies on mitosis for reproduction.

I hope this helps!

Explanation:

Newton second law of motion

The five examples where pivot can be seen include the following: 1. Nut Cracker · 2. Seesaw · 3. Scissors · 4. Plier · 5. Stapler

A pivot is the fulcrum of a simple machine that serves as a point in the machine that allows for easy movement when force of load or effort is being applied at either ends.

The pivot can eithe be located at the either ends of the simple machine or at the middle of the simple machine.

Typical examples of machines that has pivot include the following:

From the examples listed above, the pivot of nutcracker and stapler are located at its end while the pivot of seesaw, scissors and pliers are located at the middle.

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Answer:

c: to show forces acting on an object

Answer:

1.78m/s

Explanation:

Given parameters:

Velocity of the arrow = 22.8m/s

Height of the wall  = 15.5m

Unknown:

Time taken for the arrow to reach the ground  = ?

Solution:

To solve this problem we employ the appropriate motion equation:

     H  = ut + [tex]\frac{1}{2}[/tex] g t²

 H  is the height

  u is the initial velocity = 0

   g is the acceleration due to gravity  = 9.8m/s²

  t is the unknown time

  15.5 = [tex]\frac{1}{2}[/tex] x 9.8 x t²

  15.5 = 4.9t²

     t² = 3.16

      t = 1.78m/s

Taking into account the definition of kinetic energy, the kinetic energy of a 3.50kg block with a speed of 4.00 m/s is 28 J.

Kinetic energy is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.

In other words, kinetic energy is defined as the amount of work necessary to accelerate a body of a certain mass and in a position of rest, until it reaches a certain speed.

Kinetic energy is represented by the following expression:

Ec = 1/2×m×v²

where:

In this case, you know:

Replacing in the definition of kinetic energy:

Ec = 1/2× 3.50 kg× (4 m/s)²

Solving:

Ec= 28 J

Finally, the kinetic energy of a 3.50kg block with a speed of 4.00 m/s is 28 J.

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Answer:it’s a

Explanation:

Static electricity refers to the buildup or imbalance of electric charges on the surface of objects. The correct answer is B. An insulator prevents electric charge from moving through it.

An insulator prevents electric charge from moving through it. This statement describes an example of static electricity because insulators, such as rubber or plastic, do not allow electric charges to flow freely. When an insulator is rubbed or comes into contact with another object, it can cause the transfer of electrons between the two surfaces, leading to a buildup of static charge.

The charges remain stationary on the surfaces of the objects, resulting in an electrical imbalance without the flow of charges through the insulator.

Therefore, the correct answer is B. An insulator prevents electric charge from moving through it.

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Answer:

1)  The block of wood is at rest.

2)  Weight and Normal Reaction (see attached diagram).

Explanation:

Assumptions

Question 1

"At rest" or "resting" means that the object isn't moving.

Therefore, the block of wood is at rest.

Question 2

Forces that are acting on the block of wood:

See attached diagram.

When the parallel-plate capacitors are disconnected from a battery and plates are pulled a small distance farther apart then Q remains the same, C decreases, Change in potential increases, Energy stored increases and E stays the same.

Solution:

Let's take C as the capacitance of parallel plates and Q as the Charge stored and 'd' is the distance between a plate of capacitors.

In the case of disconnection between plate capacitors, the capacitance of a parallel-plate capacitor becomes equal.

Then, charge Q remains the same i.e.

Q = εA / d = Q / Ed = Q/V

Here Q refers to the charge stored in a capacitor, E is the Electric field, V is the potential difference, and 'd' is the separation between plates.

There is an inverse relationship between potential difference and distance against the capacitance between a plate of the capacitor.

Similarly, the potential difference will increase when capacitance decreases.

E = V/d

While the values of V and d show a gradual decrease, E remains constant, therefore energy stored in the capacitor will be E = 1/2CV^2

The decrease in C causes an increase in V, as a result of which energy stored in the capacitor increases.

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Answer:

the last option is correct

Explanation:

Newton's third law of motion , the ground will exact the equal opposite force the rubber ball

Answer:

The speed of the electron is 0.98c, given that the rest energy of an electron is 0.511MeV and the rest energy of a proton is 938MeV, with both particles having kinetic energies of 2.00MeV.

Explanation:

A particle's total energy and the rest energy follow the laws of physics and the theory of relativity. The energy of any particle is equal to mass times the speed of the light-squared relatively.

Where;  E=γ.〖mc〗^2

γ is the ratio of total energy to rest energy of the particle.

m_0 is known as the rest mass of the particle.

Rest energy can be written as: E_0=〖m_0 c〗^2

γ=K/E_0 +1         (1)

γ=1/(√1-v^2/c^2)     (2)

Putting the values of the electron energy into equation (1):

γ=2.00MeV/0.511MeV+1

γ= 3.91 + 1

γ=4.91

From equation (2),

γ=1/(√1-v^2/c^2)

Squaring both sides of the equation,

γ^2=1/(1-v^2/c^2)

1/γ^2 =1-v^2/c^2  

v^2/c^2 =1-1/γ^2  

v/c=√1-1/γ^2    

Making v subject of the formula,

v=√1-1/γ^2 ×c    (3)

Inserting the values into Equation 3,

v=√1-1/〖4.91〗^2 ×c

v=√1-1/24.11×c

v=√0.959×c

v=0.98×c

v=0.98c

Therefore, the speed of the electron is 0.98c.

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Answer:

Acceleration= 2 m/s²

Time= 10 s

Final Speed= 24  m/s

Final Speed= 85  m/s

Starting Speed= 0 m/s

Explanation:

By using, v = u + at

Acceleration= 2 m/s²

Time= 10 s

Final Speed= 24  m/s

Final Speed= 85  m/s

Starting Speed= 0 m/s

Explanation:

The weight is 40 * 6.2 = 248N.

Answer:

248 N

Explanation:

Weight= Gravity*mass

W= 6.2*40

W= 248N

Thank you

Answer:

increases your heart rate

Explanation:

Warming up increases your heart rate and therefore your blood flow which enables more oxygen to reach your muscles.

The constant acceleration of the green car is -2m/s2

Given,at t= 0

d=220m(distance between the cars)

let v0 be the final velocity of the green car

And,a be the green car acceleration

Then,for the red car with V1= 20km/h=5.56m/s the passing point

X1=44.5m

t1=X1/V1 =8.01s

then,X1-d=Vot1+1/2at2.......... equation (1)

And,for the red car with V2=40km/h=11.11m/s,the passing point

X1=76.6m

t2=X2/V2= 6.894s

then,X2-d= V0 t2+1/2at2.......equation (2)

on solving equation (1) & (2),

We obtain the following results;

The initial velocity of the green car is = -2m/S2 (the negative sign means that it's along the -X direction)

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Disclaimer: The question was given incomplete on the portal.Here is the complete question.

Question:a red car and a green car, identical except for the colour, move toward each other in adjacent lanes and parallel to the x−axis. At time t=0, the red car is at x r =0, and the green car is at x g =220m. If the red car has a constant velocity of 20km/h, the cars pass each other at x=44.5m, and if it has a constant velocity of 40km/h, they pass each other at x=76.6m. What is the constant acceleration of the green car?

Answer:

Radiation

Explanation:

I hope that help's

Answer:

The size of an object is directly proportional to the gravity

Explanation:

The size of an object has significant impact on the gravity exerted by such a body.

The more massive a body is, the larger the gravity it exerts.

The reason for this is because of the newton's law of universal gravitation.

Answer:

Explanation:

The force required can be found by using the formula

[tex]f = \frac{w}{d} \\ [/tex]

w is the workdone

d is the distance

From the question we have

[tex]f = \frac{25}{0.5} \\ [/tex]

We have the final answer as

Hope this helps you