A 1,000 kg car is driving on a 15 m high bridge at 5 m/s. What is the kinetic energy of the car?

0 J

12,500 J

25,000 J

147,000 J

Light reflects from surfaces in such a way that the angle of incidence equals the angle of reflection. Both angles are measured from the normal line perpendicular to the reflecting surface, as shown in the diagram:

Light is refracted when it travels through the frontier between two media. If the medium 1 has an index of refraction n₁ and the medium 2 has an index of refraction n₂, then the angle of incidence θ₁ and the angle of refraction θ₂ satisfy the following equation:

The frequency of the block (f = 0.64 Hz), we can calculate the period (T) using the formula: T = 1/f. Then, we can find the time (t) using the equation: t = T/2.

To find the earliest time after the block is released when its kinetic energy is exactly one-half of its potential energy, we can use the concept of conservation of mechanical energy.

The potential energy of the block at any given time can be calculated using the formula: Potential Energy (PE) = mgh, where m is the mass of the block, g is the acceleration due to gravity, and h is the height of the block.

The kinetic energy of the block can be calculated using the formula: Kinetic Energy (KE) = (1/2)mv², where m is the mass of the block and v is the velocity of the block.

At the earliest time, the block's kinetic energy will be exactly one-half of its potential energy. So, we can equate the two energies:

(1/2)mv² = mgh

Now, we can cancel out the mass from both sides of the equation:

(1/2)v² = gh

Rearranging the equation, we get:

v² = 2gh

Finally, we can solve for the velocity by taking the square root of both sides:

v = √(2gh)

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Answer:

17.565 kgm/s

Explanation:

Momentum = mass × velocity

I = mv..................... Equation 1

But we can calculate the value of v  using the equation of motion under gravity.

v² =  u²+2gs............. Equation 2

Where u = initial velocity, s = maximum heigth, g = acceleration due to gravity.

Given: u = 0 m/s (at the maximum heigth), s = 7.0 m.

Constant: g = 9.8 m/s²

Substitute these values into equation 2

v² = 0²+ 2×7×9.8

v² = 137.2

v = √137.2

v = 11.71 m/s.

Also given: m = 1.50 kg

substitute these values into equation 1

Therefore,

I = 1.5×11.71

I = 17.565 kgm/s

According to the data given in the question the net force on the box is of 5 N.

All of the forces that are applied to an object are added up to form the net force. As a consequence of the fact that it (force) is a vector and therefore that two forces with identical magnitudes and opposing directions cancel each other out, the resultant force is the total of the forces, or put another way, the net force is just the total of all the forces.

Given data :

Force on box to the left side (F1) = 15 N

Force on box to the right side (F2) = 20 N

Because both forces are in opposite direction

Hence,

Net force = F2 - F1

Net force = 20 - 15

Net force = 5 N.

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The mass of a girl is 62 kg.    

An acceleration of an elevator (travels up) is 3 m/s².

When the elevator is going up, the normal force of a girl is calculated as follows :

First, draw force that work in the system. (Look at the picture!)

Based on the picture, we can see that normal force has the same direction as the elevator.

It means the normal force is positive and weight is negative.

∑F      = m × a

N - W = m × a

N        = (m × a) + W

N        = (m × a) + (m × g)

N        = m (a + g)

N        = 62 (3 + 10)

N        = 62 (13)

N        = 806 N

Normal force of 62 kg girl who travel up with an acceleration 3 m/s² by an elevator is 806 Newton.

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Answer:

a = 1.49m/s²

Explanation:

Find the diagram attached  

According to Newton's second law of motion

\sum Fx = ma

Fm - Ff = ma

Fm is the moving force

Ff is the frictional force

Fm = Wsin theta

Ff = μR = μWcos theta

Wsin theta - μWcos theta = ma

W is the weight = 50.1 * 9.8 = 490.98N

theta is the angle of inclination = 27.2°

μ is the coefficient of friction = 0.343

m is the mass = 50.1kg

a is the acceleration  

Substitute into the formula as shown;

Wsin theta - μWcos theta = ma

490.98sin27.2° - 0.343(490.98)cos 27.2° = 50.1a

224.423 - 149.78 = 50.1a

74.64 = 50.1a

a = 74.64/50.1

a = 1.49m/s²

Hence the acceleration of the block is a = 1.49m/s²

Answer:v

Both prokaryotic and eukaryotic cells have similar features, like ribosomes, genetic material, a cytoplasm, and plasma membranes. There are two primary types of eukaryotic cells: animal and plant cells.

Explanation:

The correct options are:

All cathode-ray particles had the same mass to charge ratio.

The cathode-ray particle behaved identically regardless of the metal used to make it.

The discovery of subatomic particles was a major milestone in the development of modern physics, and the cathode-ray experiments played a significant role in this discovery. The cathode-ray experiments were conducted in the late 19th century by scientists such as J.J. Thomson, who demonstrated that cathode rays were composed of negatively charged particles that were much smaller than atoms. This discovery led to the development of the first subatomic particle model of the atom, in which electrons orbit a positively charged nucleus.

The lines of evidence that supported the hypothesis that the cathode-ray was a subatomic particle were crucial in demonstrating the existence of these tiny particles. The fact that all cathode-ray particles had the same mass-to-charge ratio suggested that they were a fundamental particle rather than a complex mixture of atoms. Similarly, the fact that the cathode-ray particle behaved identically regardless of the metal used to make it supported the hypothesis that the particle was a fundamental constituent of matter.

Overall, the cathode-ray experiments provided important insights into the nature of matter and paved the way for further discoveries in subatomic physics. They demonstrated that the atom was not the smallest particle of matter and helped to establish the idea of subatomic particles as the building blocks of matter.

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The direction of the acceleration vector is towards the top right of the page, at a 90-degree angle to the velocity vector. The correct answer is (d) "the velocity is towards the right of the page and the acceleration is towards the top right of the page".

At the highest point of the circular path, the direction of the velocity vector is tangential to the circle and points to the right of the page, which is the direction of motion. The acceleration vector points towards the center of the circle, which is the direction of centripetal acceleration.

Since the car is moving at a constant speed, there is no component of acceleration in the tangential direction. The magnitude of the centripetal acceleration is given by the formula a = v^2/r, where v is the velocity and r is the radius of the circle.

Therefore, the direction of the acceleration vector is towards the top right of the page, at a 90-degree angle to the velocity vector.

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Answer:

The resultant force working on the helicopter can be calculated using the formula:

Resultant force = mass x acceleration

We know that the mass of the helicopter is 3000 kg and the acceleration is the acceleration due to gravity, which is 10 m/s^2.

The force of lift that opposes the weight of the helicopter is equal to:

Resultant force = 3000 kg x (10 m/s^2 + 25 m/s^2)

Resultant force = 3000 kg x 35 m/s^2 = 105,000 N

So the resultant force working on the helicopter is 105,000 N, this is the force that the helicopter's engines need to exert to overcome the force of gravity and maintain its constant speed of 25m/s.

Answer:

true

Explanation:

Hope it helped you brainiest plz

Answer:

1) A towel waving displays a transverse waves

→ True

2) Light waves are examples of transverse wave

→ True

Explanation:

Transverse waves are made up of crests and troughs.

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a) The value of the required velocity is v(t) = t²/2 - 4t + 4e⁻⁵

b) The value of the required distance is S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

c) The value of the velocity when t = 9 is approximately -28.2 m/sec

(a)To find v(t), we need to integrate a(t) first

a(t) = 2∫

a(t) dt = ∫ 2

dt = 2t + C1

Here, C1 is the constant of integration

Next, we need to integrate v(t) by substituting the value of a(t) into it

v(t) = ∫ (2t + C1)

dt= t² + C1t + C2

Here, C2 is another constant of integration

v(0) = - 4⇒ C2 = - 4

Also, given: v(t) = Vt + 4e⁻⁵

Comparing the above two equations:

v(t) = Vt + 4e⁻⁵ = t² + C1t - 4

On differentiating with respect to t, we geta(t) = 2

Therefore, we get the differential equation as:

Vt + 4e⁻⁵ = t² + C1t - 4 - - - - - - (1)

To find v(t), we need to solve this differential equation

Substituting t = 0, in (1), we get

-4 + 4 = 0 + C1(0)⇒ C1 = 0

Therefore, the differential equation becomes:

Vt + 4e⁻⁵ = t² - 4

On differentiating the above equation w.r.t t, we get:

a(t) = 2

Therefore, we get

v(t) = t²/2 - 4t + 4e⁻⁵ - - - - - - (2)

Thus, the required velocity is given by:

v(t) = t²/2 - 4t + 4e⁻⁵

Part (b) To find s(t), we need to integrate v(t) first

v(t) = t²/2 - 4t + 4e⁻⁵∫ v(t)

dt = ∫ (t²/2 - 4t + 4e⁻⁵)

dt= t²/6 - 2t² + 4e⁻⁵t + C3

Here, C3 is the constant of integration

Also, given that S(0) = 5⇒ C3 = 5

Therefore, we get

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5 - - - - - - (3)

Thus, the required distance is given by:

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

Part (c) To find the velocity when t = 9We can use the value of v(t) obtained in part (a)⇒ v(9) = (9)²/2 - 4(9) + 4e⁻⁵⇒ v(9) = - 28.2 (approx)

Thus, the velocity when t = 9 is -28.2 (approx)m/sec.

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Statement (C). If V is positive, then I could be positive or negative, while (AT÷At) will necessarily be negative. This is because the rate of change of current with time (dI÷dt) will always be negative when a positive voltage is applied (V > 0).

Based on the given information, the correct statement is:

(C). If V is positive, then I could be positive or negative, while (AT÷At) will necessarily be negative.

The reason for this is as follows:

When a voltage is applied to the inductor, the current through it will change according to the relationship between voltage, current, and inductance. The voltage across an inductor is given by V = L(dI÷dt), where V is the voltage, L is the inductance, and (dI÷dt) is the rate of change of current with respect to time.

In this case, we are not given any information about the initial direction or magnitude of the current I. Therefore, it could be positive or negative. When a positive voltage (V > 0) is applied to the inductor, the change in current will depend on the initial conditions. If the current is positive, the rate of change of current (dI÷dt) will be negative, causing the current to decrease. Conversely, if the current is negative, the rate of change of current will be positive, causing the current to increase. Thus, the current I could be positive or negative, depending on the initial conditions.

However, regardless of the initial direction of the current, the term (AT÷At) will necessarily be negative. This is because the rate of change of current with time (dI÷dt) will always be negative when a positive voltage is applied (V > 0).

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Explanation:

Energy should be transferred to an object in order to move it. ... This amount of energy transferred by the force to move an object is called work or work done. Thus, the relation between Work and Energy is direct. That is, the difference in the Kinetic energy of an object is work done by an object.

The strength and weight of a structure generally depend on different factors. The strength of a bridge depends on the cross-sectional area of its supporting members, while the weight of the bridge depends on its volume.

When the dimensions of a steel bridge are scaled up ten times, the cross-sectional area of its supporting members will increase by a factor of 10^2 = 100, assuming that the shape of the members remains unchanged. The strength of the members will therefore increase by a factor of 100.

However, the volume of the bridge will increase by a factor of 10^3 = 1000, assuming that the overall shape of the bridge remains unchanged. The weight of the bridge will therefore increase by a factor of 1000.

Therefore, the correct answer is B) one hundred, and its weight by one thousand.

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Answer: Wavelength is the measure of the length of a complete wave cycle. The velocity of a wave is the distance traveled by a point on the wave. In general, for any wave the relation between Velocity and Wavelength is proportionate. It is expressed through the wave velocity formula.

Explanation: For any given wave, the product of wavelength and frequency gives the velocity. It is mathematically given by wave velocity formula written as-

V=f×λ

Where,

V is the velocity of the wave measure using m/s.

f is the frequency of the wave measured using Hz.

λ is the wavelength of the wave measured using m. Velocity and Wavelength Relation

Amplitude, Frequency, wavelength, and velocity are the characteristic of a wave. For a constant frequency, the wavelength is directly proportional to velocity.

Given by:

V∝λ

Example:

For a constant frequency, If the wavelength is doubled. The velocity of the wave will also double.

For a constant frequency, If the wavelength is made four times. The velocity of the wave will also be increased by four times.

Hope you understood the relation between wavelength and velocity of a wave. I truely hope this helps you out tho! Goodluck!

Explanation:

Find horizontal forces sum

(5  + 5 cos60  )  = 7.5N

Find vertical force

5 sin60 = 4.33 N

Use Pythagorean theorem to find resultant , R

R^2 = 7.5^2 + 4.33^2

R = 8.7 N  magnitude

Answer: Dependent Unit or System of Units

Explanation:

Density is calculated by dividing mass (Kg) by volume (L).

The unit of Density is Kg/L or one of their derivatives such as g/cm³.

ushi wygunu geygo sieta?

Answer:

5.672/s^2 is his acceleration

Explanation:

1 minute is equal to 60 seconds. Take that and divide 340.3 by that.

The accelerating voltage of the x-ray tube in kilovolts is 1335 kV.

An x-ray tube produces x-rays with a range of wavelengths, the shortest of which is 0.0093 nm. To determine the accelerating voltage of the x-ray tube in kilovolts, we can use the following formula:

Energy of a photon = Planck's constant × frequency of the photon  

Ephoton = h * f

Where Ephoton = hc / λ and

h = Planck's constant = 6.626 x 10⁻³⁴ J s,

c = speed of light = 3 x 10⁸ m/s,

λ = 0.0093 nm.

Therefore, we can calculate f as follows:f = c / λ = (3 x 10⁸) / (0.0093 x 10⁻⁹) Hz = 3.2258 x 10¹⁷ Hz

Then, we can find the energy of a photon:Ephoton = h * f = 6.626 x 10⁻³⁴ J s × 3.2258 x 10¹⁷ Hz = 2.14 x 10¹⁶ J

The energy of a photon is also related to the accelerating voltage, V as follows: Ephoton = eV  where e = the elementary charge = 1.602 x 10⁻¹⁹ C

Therefore, we can find the accelerating voltage, V

:V = Ephoton / e = 2.14 x 10⁻¹⁶ J / 1.602 x 10⁻¹⁹ C = 1335 kV.

Therefore, the accelerating voltage of the x-ray tube in kilovolts is 1335 kV.

Thus, the accelerating voltage of the x-ray tube in kilovolts is 1335 kV.

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fs ≥ μsn, where fs is the force of static friction and μs is the coefficient of static friction. This means that the force of static friction is equal to or greater than the product of the coefficient of static friction and the normal force (n). The correct expression for the force of static friction is D.

The resistance people feel when they try to move something that is stationary on a surface without actually moving their bodies or the surface they are trying to move it on.

It can be explained as the frictional force that perfectly balances the applied force throughout the body's stationary state.

The static frictional force is self-regulating, meaning that it will always be equal to and the opposite of the applied force.

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True. In the world of film, sound plays a critical role. It helps to set the tone and mood of a scene, and can even be used to foreshadow events or provide subtle hints about the characters and their situations.

As such, sound is an integral part of the filmmaking process. When it comes to sound in film, it is generally geared to time. This means that the sound must be timed to match the visual elements of the scene.

Music, sound effects and dialogue must all be timed in order to create the desired effect and to ensure that they don’t interfere with one another. Sound also has to be carefully timed to match the action on screen. For example, gunshots must be timed in order to match the physical movements of the characters and other visual elements.

Additionally, sound must be timed to match the timing of the edits, so that the audience can easily follow the action on screen. In short, sound in film is closely tied to the timing of the visuals, and sound designers must be sure to time the sound correctly in order to create the desired effect.

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Answer:

its false

Explanation:

because Longitudinal waves are in which particles of the medium move directio ni. parallel to the energy transport.

I think this is ur answer

Answer:

kinectic energy-in physics kinetic energy of an object is the energy that it possesses due to its motion

potential energy-in physics potential energy is the energy held by an object because of its position relative to other objects,its electric charge,or other factors

Answer:

Hey!

Well KINETIC ENERGY is...

the energy generated by the / of the object is that it possesses due to its motion...

POTENTIAL ENERGY is...

The energy held by an object because of its position relative to other objects,  its electric charge, or other factors...

Explanation:

So in easier terms, KINETIC ENERGY is just the ENERGY GENERATED BY THE OBJECT'S MOVEMENT and...

POTENTIAL ENERGY IS THE TOTAL AMOUNT OF ENRGY THAT THE OBJECT HOLDS (due to an electric charge etc)

Hope this helps!

The formula 1 kg = 2.2 lb is used to convert kilograms (kg) to pounds (lb). We can change a kilogram to a pound by multiplying by 2.2. When converting 62 kg to pounds, the result is 136.68 lbs.

One gram, or one thousandth of a kilogram, is comparable to one cubic centimeter of water in terms of mass. The metric system uses the gram as its SI unit of weight.

For practical purposes, such as in recipes, calculations, and scientific conundrums, one milliliter of water contains one gram's worth of mass and weighs one gram. To comprehend the milliliter measurement, mathematics is not essential.

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Answer: c. The electric force increases

Explanation:

If the distance between two charged particles decreases, the electric force between them increases.

According to Coulomb's Law, the electric force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. Mathematically, the equation can be represented as:

F = k * (q1 * q2) / r^2

Where:

F represents the electric force between the particles.

k is the electrostatic constant.

q1 and q2 are the charges of the particles.

r is the distance between the particles.

As the distance (r) between the particles decreases, the denominator of the equation (r^2) becomes smaller, causing the overall electric force (F) to increase. Conversely, if the distance between the charged particles increases, the electric force between them decreases. This inverse relationship between the distance and electric force is a fundamental characteristic of the electrostatic interaction between charged objects.

Answer:

Actions that underlie mathematical rules, patterns or probability distributions.

For example how fast something falls at any given point or time.

More complex actions, such as human decision making in single individuals would be way too complicated to describe in physical terms.

But note that there can be physical models of such things as traffic when we can assume statistical knowledge of behavior.

Also physical models are used to plan such things as emergency exits in big stadiums, because many thousands of people can be described as particles flowing under a given pressure.

Every time we can gain good statistical knowledge and can therefore see patterns and rules in action, we can build theoretical models to make predictions and simulations (and games btw)

Since it's fair to say that mathematics is the science of patterns, it is plausible that physical descriptions often come in mathematical formulations, so that it can be understand as an efficient language of physics.

Neighboring disciplines like chemistry relay on physical theories to build on them,and then add shortcuts to fit their needs and interests, generating an own language for their field of study. But physicists may refer to them as anadd-on to physics.

Physics can basically explain all actions wich you can express in numbers.

But note that on a fundamental level physics describes 'how' things work, not necessarily 'why' they do it this way. The source of the basic and most fundamental physical constants and rules remains a mystery till this day.But of course there are theories on that as well, wich mostly can neither be proved or falsified.

The text is my own work and based of my general knowledge and quintessence of lectures on physics and other fields I attended.

(I would really appreciate the brainliest)

The calculated average n2 does not agree with the given index of refraction, indicating a potential discrepancy that may be attributed to experimental limitations or errors.

To analyze the agreement between the values for the index of refraction (n2) of glass in each trial, we can observe the trend and variation in the data. From the table, it appears that the values for n2 increase as the angles θ1 and θ2 increase. However, it is difficult to determine the level of agreement between the values without further statistical analysis or calculation of uncertainties.

The conclusion regarding whether the index of refraction is constant for a given medium depends on the level of agreement observed. If the values for n2 in each trial are close to each other and do not deviate significantly, it suggests good agreement and supports the hypothesis of a constant index of refraction.

On the other hand, if there is significant variation and inconsistency among the values, it indicates that the index of refraction may not be constant for the given medium.

To determine the average value of n2 from the provided results, we can calculate the mean of the n2 values:

Average n2 = (1.46 + 1.61 + 1.73 + 1.96 + 2.08 + 2.13) / 6 ≈ 1.85

Comparing the calculated average n2 (1.85) with the given index of refraction of the glass (1.50), we can see that they do not agree. The calculated average n2 is higher than the given value of 1.50. This suggests that there might be some systematic error or uncertainties in the measurements or calculations.

The difference between the calculated and given values could be due to factors such as experimental errors, instrumental limitations, or other sources of uncertainty in the measurement process.

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Complete question is:

Calculate sinθ1, sinθ2 and n2 for each of your results and add them to table 1. Keep your results to 2 or 3 significant figures.

Compare the values for index of refraction of glass for each trial (values in last column). Is there good agreement between them? Would you conclude that index of refraction is a constant for a given medium?

Determine the average value of n2 from your results.

Compare your calculated n2 with the given index of refraction of the glass (1.50). Do they agree? Explain why it does or doesn’t.