Calculate the displacement and velocity at times of (a) 0.500 s, (b) 1.00 s, (c) 1.50 s, (d) 2.00 s, and (e) 2.50 s for a rock thrown straight down with an initial velocity of 14.0 m/s from the Verrazano Narrows Bridge in New York City. The roadway of this bridge is 70.0 m above the water.

Answer:

Explanation:

A novae in astronomy means an explosion in the white dwarf star which had tapped enough gas from a companion star,hence it releases an incredible amount of energy which is Over a million times brighter than it normal stars.

A super novae on the other hand is a cosmic explosion that can be a billion times brighter than the normal.

From this one can see that a perculiar similarity between a novae and super novae is that both generate huge explosion and bright Ness, and a major difference is super novae release huge amount of brightness and energy more than the novae

Answer:

(1) Conductive medium (2) Load.

Explanation:

Electricity is essentially Flow of electrons in conductive medium such as wire and to harness it there needs to be a load in the circuitry to use up the energy of the moving electrons through the wire.

this is how solar cells work, in them there are Silicon P and N Junctions connected in series and parallel ( quite alot of them) forming a large plate , which then can be connected to a load through wires to harness electricity produced.

Answer:

Considering the two cases of when the train is moving towards and away from the stationary observer. The observed frequency of sound waves from the train can decrease when

1) The speed of the train is slowly reducing and its direction is towards the stationary observer.

2) The speed of the train is slowly increasing and its direction is away from the observer for the sound's observed frequency to keep decreasing.

Explanation:

This phenomenon is due to Doppler's Effect.

Doppler's Effect explains how relative frequency of a sound source varies with the velocity of the source or the observer.

Generally, the mathematical expression for Doppler's Effect is given below

f' = f [(v + v₀)/(v - vₛ)]

where

f' = observed frequency

f = actual frequency

v = velocity of sound waves

v₀ = velocity of observer

vₛ = velocity of sound source

When the train is moving towards the stationary observer,

f' = observed frequency of the sound wave = f₁

f = actual frequency of the sound wave = f

v = velocity of sound waves = v

v₀ = velocity of observer = 0 m/s

vₛ = velocity of sound source = vₛ

f' = f [(v + v₀)/(v - vₛ)]

f₁ = f [(v + 0)/(v - vₛ)]

f₁ = fv/(v - vₛ) (eqn 1)

Observed frequency is obviously higher than the frequency of the train.

But if the train keeps reducing its speed (vₛ) towards from the stationary observer, the observed frequency will decrease.

When the train is moving away from the stationary observer,

f' = observed frequency of the sound wave = f₂

f = actual frequency of the sound wave = f

v = velocity of sound waves = v

v₀ = velocity of observer = 0 m/s

vₛ = velocity of sound source = - vₛ (train is moving away from the observer, hence, the negative sign)

f' = f [(v + v₀)/(v - vₛ)]

f₂ = f [(v + 0)/(v - (-vₛ)]

f₂ = fv/(v + vₛ) (eqn 2)

From the expression, it is clear that the observed frequency is smaller than the frequency of the sound waves and it keeps decreasing as the speed of the train (vₛ) increases as the train moves away from the stationary observer.

Hope this Helps!!!

Answer:

The student can conclude that the speed of the train is increasing while the direction of the train is away from her or him

Explanation:

Here we have the Doppler effect given by

For an approaching wave

[tex]F_{obs} =\left [ \frac{v}{v - v_{source}} \right ] f_{source[/tex]

For a receding wave we have

[tex]F_{obs} =\left [ \frac{v}{v + v_{source}} \right ] f_{source[/tex]

Therefore, comparing the denominators of the two equation, it is seen that the frequency heard by the observer is decreases for a receding wave.

That is the student can conclude that the train is moving away from her or him or that the speed of the train is increasing while the direction of the train is away from her or him.

Answer:

D. Iron nail

Explanation:

Answer:

The answer is 80 Joules

Explanation:

Electrical energy = Q x V

Energy = 2 x 40

= 80

I just took the test and it was right :D

The correct answer is B.

I hope this helped! :D

Answer:

(a) Displacement = - 3.0576 m

(b) Velocity  [tex]=-66.48[/tex] m/s

(c)Acceleration   = -753.39 m²/s

(d)The phase motion is 26.7 [tex]\pi[/tex].

(e)Frequency =2.5 Hz.

(f)Time period =0.4 s

Explanation:

Given function is

[tex]x= (5.2 m)cos[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

(a)

The displacement includes the parameter t, so,at time t=5.3 s

[tex]x|_{t=5.3}= (5.2 m)cos[ (5\pi \ rad/s)5.3+ \frac\pi5][/tex]

           [tex]= (5.2 m)cos[ 26.5\pi+ \frac\pi5][/tex]

           =(5.2)(-0.588)m

           = - 3.0576 m

(b)

[tex]x= (5.2 m)cos[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

To find the velocity of simple harmonic motion, we need to find out the first order derivative of the function.

[tex]v=\frac{dx}{dt}[/tex]

 [tex]=\frac{d}{dt} (5.2 m)cos[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

  [tex]= (5.2 m)(-5\pi)sin[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

  [tex]= -26\pi sin[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

Now we can plug our value t=5.3 into the above equation

[tex]v= -26\pi sin[ (5\pi \ rad/s)5.3\ s+ \frac\pi5][/tex]

 [tex]=-66.48[/tex] m/s

(c)

To find the acceleration of simple harmonic motion, we need to find out the second order derivative of the function.

[tex]v= -26\pi sin[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

[tex]a=\frac{d^2x}{dt^2}[/tex]

 [tex]=\frac{dv}{dt}[/tex]

 [tex]=\frac{d}{dt}( -26\pi sin[ (5\pi \ rad/s)t+ \frac\pi5])[/tex]

 [tex]= -26\pi (5\pi)cos[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

 [tex]= -130\pi^2cos[ (5\pi \ rad/s)t+ \frac\pi5][/tex]

Now we can plug our value t=5.3 into the above equation

[tex]a= -130\pi^2cos[ (5\pi \ rad/s)5.3 \ s+ \frac\pi5][/tex]

  = -753.39 m²/s

(d)

The general equation of SHM is

[tex]x=x_mcos(\omega t+\phi)[/tex]

[tex]x_m[/tex] is amplitude of the displacement, [tex](\omega t+\phi)[/tex] is phase of motion, [tex]\phi[/tex] is phase constant.

So,

[tex](\omega t+\phi)=5\pi t+\frac\pi5[/tex]

Now plugging t=5.3s

[tex](\omega t+\phi)=5\pi \times 5.3+\frac\pi5[/tex]

             =26.7 [tex]\pi[/tex]

The phase motion is 26.7 [tex]\pi[/tex].

The angular frequency [tex]\omega = 5\pi[/tex]

(e)

The relation between angular frequency and frequency is

[tex]\omega =2\pi f[/tex]

[tex]\therefore f=\frac{\omega}{2\pi}[/tex]

     [tex]=\frac{5\pi}{2\pi}[/tex]

    [tex]=\frac52[/tex]

   = 2.5 Hz

Frequency =2.5 Hz.

(f)

The relation between frequency and time period is

[tex]T=\frac1 f[/tex]

   [tex]=\frac1{2.5}[/tex]

  =0.4 s

Time period =0.4 s

Answer:

30 m³

Explanation:

Parameters given:

Initial volume of helium, V1 = 5 m³

Initial pressure in balloon, P1 = 30 kPa

Final pressure, P2 = 5 kPa

To find the volume of the balloon at that volume, we apply Boyle's law.

It states that at constant temperature, the pressure of a gas is inversely proportional to the volume of the gas.

Mathematically:

P = k / V

Where k = constant of proportionality

This implies that:

P * V = k

This means that if the pressure or volume of the gas changes at the same temperature, the product of the pressure and volume would be the same:

Hence:

P1 * V1 = P2 * V2

Hence, to find the final volume:

30 * 5 = 5 * V2

=> V2 = (30 * 5) / 5

V2 = 30 m³

The volume of the gas when the pressure is 5 kPa is 30 m³.

Explanation:

Given that,

Mass if the rock, m = 1 kg

It is  suspended from the tip of a horizontal meter stick at the 0-cm mark so that the meter stick barely balances like a seesaw when its fulcrum is at the 12.5-cm mark.

We need to find the mass of the meter stick. The force acting by the stone is

F = 1 × 9.8 = 9.8 N

Let W be the weight of the meter stick. If the net torque is zero on the stick then the stick does not move and it remains in equilibrium condition. So, taking torque about the pivot.

[tex]9.8\times 12.5=W\times (50-12.5)\\\\W=\dfrac{9.8\times 12.5}{37.5}[/tex]

W = 3.266 N

The mass of the meters stick is :

[tex]m=\dfrac{W}{g}\\\\m=\dfrac{3.266}{9.81}\\\\m=0.333\ kg[/tex]

So, the mass of the meter stick is 0.333 kg.

The mass of the meterstick is calculated using the principle of torque balance. The meterstick must have a mass that creates an equal opposite torque to the one created by the 1-kg rock. The calculation shows that the meterstick has a mass of 1/3 kg, which is not listed in the options, so the answer is (E) none of the above.

The mass of the meterstick can be found using the principle of moments, also known as the principle of leverage, which states that for an object to be in rotational equilibrium, the sum of the clockwise moments about the pivot (fulcrum) must equal the sum of the counterclockwise moments. In this case, the 1-kg rock is hanging from the 0-cm mark and the meterstick balances when the fulcrum is at the 12.5-cm mark. The torque created by the 1-kg mass is given by its mass multiplied by its distance from the fulcrum, or 1 kg × 12.5 cm.

For the meterstick to balance, its center of mass must be located directly above the fulcrum. Since the meterstick is uniform, its center of mass is in the middle, at the 50-cm mark. This means that the mass of the meterstick acts 50 cm - 12.5 cm = 37.5 cm away from the fulcrum. Let's denote the mass of the meterstick as 'M'. The counterbalance torque provided by the meterstick is given by M kg × 37.5 cm.

Setting the torques equal for a balanced system:
M kg × 37.5 cm = 1 kg × 12.5 cm, which simplifies to M = 1/3 kg. Since 1/3 kg is equivalent to approximately 0.33 kg, the correct answer is (E) none of the above, as none of the provided options matches this result.

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Answer:

The thermal energy generated by the friction as the mass slides down the ramp is [tex]\bf{146~J}[/tex].

Explanation:

Given:

The mass of the object is, [tex]m = 1.0~kg[/tex]

The angle of the ramp is, [tex]\theta = 45^{0}[/tex]

The initial height of the object on the ramp is, [tex]h = 20~m[/tex]

The final velocity of the object is, [tex]v = 10~m/s[/tex]

When the object is at rest on the ramp, its total energy is potential energy. When it moves down the ramp its kinetic energy is increased and potential energy is decreased and a part of its energy is lost to overcome the force of friction. Finally, when it is at the bottom of the ramp, its total energy becomes only kinetic energy.

The total energy of the object at a height [tex]20~m[/tex] on the ramp is given by

[tex]E_{1} &=& mgh\\~~~~&=& (1.0~kg)(9.8~m/s^{2})(20~m)\\~~~~&=& 196~J[/tex]

When the object is at the bottom of the ramp, its total energy is given by

[tex]E_{2} &=& \dfrac{1}{2}mv^{2}\\~~~~&=& \dfrac{1}{2}(1.0~kg)(10~m/s)^{2}\\~~~~&=& 50~J[/tex]

So, the energy that is lost as thermal energy is given by

[tex]E &=& E_{1} - E_{2}\\~~~~&=& 196~J - 50~J\\~~~~&=& 146~J[/tex]

Answer:

Explained Below.

Explanation:

Whenever the different resistors are fixed parallel along with an ideal battery , we can be certain that it carries the same potential difference across each of them.

And potential difference is nothing but the energy that charge moves with. It can also be denoted as (p.d.) and potential difference is been calculated as volts that is been denoted as (V).

Answer:

The correct option is;

Neither A nor B

Explanation:

The common cause of a vehicle pulling to the right or to the left during braking is due to a contaminated breaking surface or a faulty caliper. Other causes include tire size variation or worn out suspension components.

Other causes include;

Leaking break fluid

Piston frozen in wheel cylinder or caliper  

Adjuster of rear break

Tire fault.

As soon as it is observed that the vehicle pulls on one side when braking, the vehicle should should be taking for checks by a qualified mechanic as soon as possible.

Final answer:

Both Technician A and B are incorrect, as a pull during braking is more likely due to uneven brake pad wear, sticking calipers, or collapsed brake lines rather than a defective metering or proportioning valve.

Explanation:

The question relates to whether a pull to the right during braking could be caused by a defective metering valve, and whether a pull to the left could be caused by a defective proportioning valve. Neither of these assertions is typically accurate.

A metering valve is designed to ensure that the rear brakes engage just after the front brakes, to prevent rear wheel lockup during early brake application. A proportioning valve adjusts the pressure between the front and rear brakes to prevent the rear wheels from locking up during heavy braking. Neither valve is designed to balance the braking force from side to side.

A pull to one side during braking is more likely to be caused by uneven brake pad wear, sticking calipers, or a collapsed brake line, rather than issues with the metering or proportioning valves. Therefore, both Technician A and Technician B are incorrect regarding the cause of a pull during braking.

Answer:

A and B i think

Explanation:

(A) For large atoms, more neutrons than protons are needed to be stable.

(B) Nuclei that have 90 or greater protons are always radioactive.

A stable nucleus of an atom must have nutron-to-proton ratio of at least one. This implies that the nucleus must have more neutrons than protons.

From the graph we can conclude the following about stability of nucleus of an atom;

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Answer:

Downwards into the plane

Explanation:

Solution:-

- This is a conceptual application of  hand rule. We will place our palm fingers open vertical to a plane surface. Then curl our fingers in and naturally point the thumb.

- The direction of curl of fingers denotes the direction of of current flow in the coil. Which in our case is "clockwise direction". We will orient/invert our right hand palm in such a way that we curl our fingers in clockwise fashion. Then stick the thumb out to give us the direction of magnetic field or North pole end. In our case the the thumb points downwards into the plane denoting that the magnetic field within the loop is also acting downwards into the plane.

- The bar magnet would be placed in such a way that North pole is pointing downward into the plane in the direction of magnetic field and end up at south pole pointing up out of the plane.

Answer:

1. B

Explanation:

Work = Force × Distance

Work = 4N × 1.5M

Answer:

4

Explanation:

1. Phosphorylation of Glucose

2. Production of Fructose-6 Phosphate

3. Production of Fructose 1, 6-Diphosphate

4. Splitting of Fructose 1, 6-Diphosphate

5. Interconversion of the Two Sugars

6. Formation of NADH and 1,3-Diphoshoglyceric acid

7. Production of ATP and 3-Phosphoglyceric Acid

8. Relocation of Phosphorus Atom

9. Removal of Water

10. Creation of Pyruvic Acid and ATP

The process of breaking down glucose into pyruvate while oxygen is present is known as glycolysis.

Thus, It is a multi-step process that the cytoplasm's many enzymes catalyze. It is recognized as the initial stage of the cellular respiration process that all living things go through.

Glucose is converted to glyceraldehyde-3-phosphate during the preliminary phase, and glyceraldehyde-3-phosphate is converted to pyruvate during the pay-off phase.

The glycolysis process produces the chemicals NADH and ATP. The ten steps of glycolysis include the partial oxidation of glucose to pyruvic acid.

Thus, The process of breaking down glucose into pyruvate while oxygen is present is known as glycolysis.

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Answer:      

Paul speed after being pulled 2.9 m is 2.68m/s.

Explanation:

The work energy theorem, change in kinetic energy of the object  from initial position to the final position is equal to the work done on the object ie when the force is applied on  the object the object changes its position and work is done on the object.

According to the law of conservation of energy ,

ΔE = W,  eqn 1

where ΔE  is the change in object energy

          W is the all the work done on the object.

Work done is written as W =F dcosθ

Where F is the force,

           d is the distance,

            θ is the angle between the force and displacement vector.

From the figure given below,

The work of friction is given by W₁  = F₁ d cos180°

The work of  pulling force is given by W₂ =F₂ dcos 30°

Change in object energy  ΔE = mv²/2.

Applying Newton first law along Y axis,

Fsin30° + N =mg

Normal force N =mg - Fsin30°

Frictional Force F₁ =μN =μ(mg - Fsin30°)

Substituting in eqn 1

mv²/2 = F₂ dcos 30°+ μ(mg - Fsin30°)d cos180°

          =[tex]\frac{\sqrt{3} }{2}[/tex] F₂ d -  μ(mg - [tex]\frac{F}{2}[/tex])d

v² = [tex]\sqrt{3}[/tex] [tex]\frac{F}{m}[/tex]d - 2μgd +

here m  = 12 kg,

        d = 2.9 m.

        μ = 0.21

        F = 29 N

Sub all values,              

v² =  7.2

v = 2.68m/s

Paul speed after being pulled 2.9 m is 2.68m/s.

Answer:

Convection is the heat transfer due to the bulk movement of molecules within fluids such as gases and liquids, including molten rock. Condensation is the process by which water vapor in the air is changed into liquid water. Condensation is crucial to the water cycle because it is responsible for the formation of clouds. These clouds may produce precipitation, which is the primary route for water to return to the Earth's surface within the water cycle.

Explanation:

Their a difference....... A huge One

Condensation is the transition from gas to liquid, whereas conduction is a form of heat transfer through direct contact between objects.

The difference between condensation and conduction lies in their definition and the processes they describe. Condensation is a phase change in which a substance transitions from a gaseous state to a liquid state, often as a result of cooling. It is not directly related to heat transfer but is a thermodynamic process. On the other hand, conduction is a mode of heat transfer where thermal energy is transmitted through stationary matter due to physical contact, as when heat from an electric burner moves to the bottom of a pan.

Examples of conduction include the warming of a glass when holding it in a warm hand or the transfer of heat from a stove's burner to a pan. Convection is another mode of heat transfer involving the movement of fluids, which plays an important role in weather systems and heating systems. In contrast, conduction relies on direct contact between objects for heat to be transferred.

Answer:

That scenario can be explained by the idea of the contribution of dark matter on that point.

Explanation:

It can be explained through the idea of dark matter, this one was born to explain why stars (or any object) that were farther for the supermassive black hole in the center of the Milky Way galaxy didn't decrease it rotational velocity as it was expected according to equation 1.

[tex]v = \sqrt{\frac{G M}{r}}[/tex]  (1)

Where v is the rotational velocity, G is the gravitational constant, M is the mass of the supermassive black hole, and r is the orbital radius.

Notice, that If the distance increases the orbital speed decreases (inversely proportional).

Final answer:

Astronomers explain the high velocities of stars orbiting the Milky Way's center outside our Sun's orbit by the gravitational influence of dark matter. This halo of invisible matter adds mass to the galaxy, affecting the orbital speeds in accordance with Kepler's third law.

Explanation:

Astronomers have observed that stars and other objects orbiting the center of the Milky Way Galaxy farther out than our Sun move around faster than we do, which is an unexpected observation according to Kepler's third law. Typically, as per Kepler's third law, we would expect objects that are farther from the center of mass to orbit more slowly. However, the presence of invisible matter, which we now understand as dark matter, affects the gravitational pull and thus the orbital velocities of these outer objects, leading them to move at unexpectedly high speeds.

The Milky Way is surrounded by a halo of this invisible matter, which does not emit or reflect light, making it undetectable through traditional means. Instead, its presence is inferred from its gravitational effects on the motions of stars and gas in the galaxy. The observations mentioned, where objects beyond the luminous part of the Milky Way are moving faster than expected, provide evidence for the existence of dark matter, as this additional mass can account for the higher orbital velocities.

Answer:

As we need to use a nested loop in our function,hence push $ra

pop $ra

jal nested_function_label

nop is the correct option.

Hope this helped you

:)

Have a great day!

Answer:

C. the same.

Explanation:

The drift speed of electrons in a circuit is the same all through the circuit.

The drift speed of the electrons remains the same before and after they pass through the source of emf because the current is constant throughout the circuit assuming a steady state situation. The emf source does not affect the drift speed despite functioning like a pump that maintains the potential difference.

The drift speed of the electrons after leaving the source of emf is the same as before entering it. This is so because, in a steady-state situation where the current is constant throughout a circuit, the rate at which electrons enter any given section of the circuit must equal the rate at which they exit. The drift speed is the average speed of the electrons as they move through the conductor, and it remains constant throughout the entirety of the circuit assuming the diameter of the wire is consistent.

It's important to understand that the emf source acts like a pump, helping move the electrons through the circuit and maintaining a potential difference. However, this doesn't result in an increase in the electron drift speed, as the overall velocity of the electron stays steady. Even in the presence of an electric field, the phenomenon known as drift velocity remains unaffected due to the near-random movements of the free electrons caused by their collisions with atoms and other free electrons.

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Answer:

The block solar winds and other harmful things

Explanation:

The Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation.

Answer:

Explanation:The Earth's magnetic field serves to deflect most of the solar wind, whose charged particles would otherwise strip away the ozone layer that protects the Earth from harmful ultraviolet radiation. One stripping mechanism is for gas to be caught in bubbles of magnetic field, which are ripped off by solar winds.

a) 4F0

b) Speed of planet B is the same as speed of planet A

Speed of planet C is twice the speed of planet A

Explanation:

a)

The magnitude of the gravitational force between two objects is given by the formula

[tex]F=G\frac{m_1 m_2}{r^2}[/tex]

where

G is the gravitational constant

m1, m2 are the masses of the 2 objects

r is the separation between the objects

For the system planet A - Star A, we have:

[tex]m_1=M_p\\m_2 = M_s\\r=R[/tex]

So the force is

[tex]F_A=G\frac{M_p M_s}{R^2}=F_0[/tex]

For the system planet B - Star B, we have:

[tex]m_1 = 4 M_p\\m_2 = M_s\\r=R[/tex]

So the force is

[tex]F=G\frac{4M_p M_s}{R^2}=4F_0[/tex]

So, the magnitude of the gravitational force exerted on planet B by star B is 4F0.

For the system planet C - Star C, we have:

[tex]m_1 = M_p\\m_2 = 4M_s\\r=R[/tex]

So the force is

[tex]F=G\frac{M_p (4M_s)}{R^2}=4F_0[/tex]

So, the magnitude of the gravitational force exerted on planet C by star C is 4F0.

b)

The gravitational force on the planet orbiting around the star is equal to the centripetal force, therefore we can write:

[tex]G\frac{mM}{r^2}=m\frac{v^2}{r}[/tex]

where

m is the mass of the planet

M is the mass of the star

v is the tangential speed

We can re-arrange the equation solving for v, and we find an expression for the speed:

[tex]v=\sqrt{\frac{GM}{r}}[/tex]

For System A,

[tex]M=M_s\\r=R[/tex]

So the tangential speed is

[tex]v_A=\sqrt{\frac{GM_s}{R}}[/tex]

For system B,

[tex]M=M_s\\r=R[/tex]

So the tangential speed is

[tex]v_B=\sqrt{\frac{GM_s}{R}}=v_A[/tex]

So, the speed of planet B is the same as planet A.

For system C,

[tex]M=4M_s\\r=R[/tex]

So the tangential speed is

[tex]v_C=\sqrt{\frac{G(4M_s)}{R}}=2(\sqrt{\frac{GM_s}{R}})=2v_A[/tex]

So, the speed of planet C is twice the speed of planet A.

Answer:

The answer to your question is time = 1 s

Explanation:

Data

time = ?

Power = 700 W

Work = 700 J

Power is defined as the work done per unit of time.

Formula

Power = Work / Time

-Solve for time

Time = Work/Power

-Substitution

Time = 700 / 700

-Result

Time = 1 s

Conclusion

In 1 second and with 700 J there will be produced 700 watts

Answer: Because of different redshift of cloud.

Explanation:

We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift.

A quasar's spectrum is hugely redshifted. And most astronomers think this large redshift tells us about the distance to the quasar.

Answer:

94.73 meters.

Explanation:

Using SUVAT.

s = ?

u = 30

v = 0

a  = -4.75

t = ?

[tex]v^{2}=u^2+2as\\0=30^2+2(-4.75)s\\\\900=9.5s\\s = 94.73[/tex]

The car will travel approximately 94.74 meters before it stops.

To answer this question, we can use the equations of motion.

When the car stops, its final velocity will be 0 m/s.

We can use the equation v^2 = u^2 + 2as,

where v is the final velocity,

u is the initial velocity,

a is the acceleration, and

s is the distance.

Plugging in the values, we have (0)^2 = (30)^2 + 2(-4.75)s.

Solving for s, we get s = 900/9.5, which is approximately 94.74 meters.

Therefore, the car will travel approximately 94.74 meters before it stops.

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Answer:

As the sound approaches the observer, the pitch increases; as it passes the observer, the pitch decreases.

Explanation:

The crests come closer when it approaching, and go farther when the source passes the observer.

Answer:

GRAVITATIONAL FORCE

Explanation:

We may have noticed that a body thrown upward in air falls back down again after attaining a particular height. The object was able to fall down back due to the effect of gravity acting on it. If there are no force of gravity acting on the body, the body will not fall back but rather disappears into the thin air.

A coin tossed upward in the air which falls back down when released is therefore under the influence of gravity i.e GRAVITATIONAL FORCE while it moves upward after it is released

Answer:

true

Explanation:

because I say it's true

Answer:help me with my physics please

Explanation:

Answer:

Frequency 5hz

Explanation:

Final answer:

To calculate the frequency of a wave with a speed of 100 m/s and a wavelength of 20 meters, divide the speed by the wavelength, resulting in a frequency of 5 Hz.

Explanation:

To find the frequency of a wave when you know its speed and wavelength, you can use the formula: speed = (wavelength) x (frequency). Rearranging this formula to solve for frequency gives us frequency = speed / wavelength. In this case, with a wave speed of 100 m/s and a wavelength of 20 meters, the calculation would be frequency = 100 m/s / 20 m.

Therefore, the frequency of the wave is 5 Hz. This means the wave completes 5 cycles per second.