Which of the following is an example of the Doppler effect? (2 points)
A. A water bug on the surface of a pond is producing small ripples in the water. The bug is not moving
B. A police car with its siren on is driving towards you, and you perceive the pitch of the siren to increase.
C. Scientists measure the speed of light and find that it is constant.
D. The gravitational pull of two objects on each other

An item obtains mechanical energy when an external force applies positive work to it.

The object experiences negative work when the force and displacement are in the opposite directions; as a result, the item loses mechanical energy.

The power needed, which is defined as energy per unit of time, depends on the velocity.

More power is needed to move a certain distance quickly, thus you must provide the same quantity of energy over a shorter period of time.

Work is defined as the energy transferred while exerting force to move an item across a distance. It is the result of distance and force.

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The frequency of the violet light is\(7.5 x 10^14 Hz (Hertz).\)

The frequency of the wave is determined by dividing the velocity of light by its wavelength.

\(v=f/λWhere:v = velocity of light f = frequency λ = wavelength of the light\)

The speed of light is\(3.00 x 10^8\) meters per second (m/s).

To convert 400 cm into meters, divide 400 by 100. 400 cm = 4 m

Therefore,λ = 4 meters

Plugging these values into the formula, \(v = (3.00 x 10^8 m/s) / (4 m) = 7.5 x 10^14 Hz\)

So, the frequency of the violet light with a wavelength of \(400 cm is 7.5 x 10^14 Hz.\)

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The  total mechanical energy of the ball is 473.5 J. Hence, option (C) is correct.

The ability to perform tasks is referred to as energy. Joules (J) is the SI unit for energy . Energy is a scalar quantity.

Given that: A baseball player throws a 0.5 kg baseball to a teammate. When the ball reaches a height of 15 m and has a velocity of 40 m/s.

Hence, the total  mechanical energy of the ball is =

Kinetic energy + potential energy

= mv^2/2 + mgh

= 0.5×40^2/2 J + 0.5×9.8×15 J

= 473.5 J.

So, the mechanical energy of the baseball is 473.5 J.

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Answer:

no sabo por q no mi entender

To calculate the internal energy of an ideal monoatomic gas, we can use the formula:

U = (3/2) * n * R * T,

where U is the internal energy, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Given:

Number of moles (n) = 1.75 moles,

Temperature (T) = 20.0 °C.

First, we need to convert the temperature from Celsius to Kelvin:

T(K) = T(°C) + 273.15.

T(K) = 20.0 + 273.15 = 293.15 K.

Now we can substitute the values into the formula and calculate the internal energy:

U = (3/2) * 1.75 * (8.314 J/mol·K) * 293.15 K.

U ≈ 1.75 * 3 * 8.314 * 293.15 ≈ 14500 J.

Therefore, the internal energy of 1.75 moles of an ideal monoatomic gas at a temperature of 20.0°C is approximately 14500 J. None of the given options match the calculated value.

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Answer:

D

Explanation:

Answer:

t=J/F

Explanation:

We know that impulse is given by J = Ft
where F is the force applied and t is the time of impact
Rearranging the equation, we get,
t = J/F

The pulley system to the right will be in static equilibrium at an unknown angle of 90 degrees.

An object must satisfy two requirements of equilibrium in order to maintain static equilibrium. First, there must be no net force acting on the item. Second, there must be no net torque pulling on the object.

The 80 N weight is fastened to a freely rotating pulley in this setup.

As a result, the cable's tension is also 80 N.

The tensions' x components must be balanced against one another:

T1x = T2x

Since T1x = T1 cos(θ) and T2x = 0 (because the cable attached to the wall is vertical), we have:

T1 cos(θ) = 0

Therefore, cos(θ) = 0, which means that θ = 90 degrees.

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Answer:

4 m/s^2

Explanation:

The acceleration is defined as: Δv/Δt (the difference of the velocity over a time period in which happens that difference).

Remember that a difference is calculated by subtracting the initial value of a physical quantity from its final value.

In our case:

Δv = Vfinal - Vinitial = 36m/s - 0 m/s = 36m/s

Δt = 9s

a = Δv/Δt = 36m/s / 9s = 4m/s^2

Answer:

i cannot see the the claim

Explanation:

The sun is the center of the solar system which is surrounded by the nine planets and they tend to orbit the sun in concentric circles with the sun as the center.

The term solar system has to do with the arrangement of the sun and the planets. The sun lies at the focus of the solar system. Now we know that there are nine planets that orbit around the sun. The distance between the planets and the sun depends on their relative proximity to each other.

Thus, the sun is the center of the solar system which is surrounded by the nine planets and they tend to orbit the sun in concentric circles with the sun as the center.

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Answer:

atom

Explanation:

the first guy who gave link this is for you:

we cannot use links in brainly

Thankyou.

Let's assume that the acceleration due to gravity on Earth's surface is denoted as g. Since the asteroid experiences a free-fall acceleration 8.0 times smaller, we can write the equation:

a_ast = (1/8.0)g

Here, a_ast is the acceleration experienced by the asteroid. The force of gravity acting on an object is given by the equation F = mg, where m is the mass of the object. Since the mass of the asteroid cancels out in this case, we can equate the gravitational force acting on the asteroid to its acceleration multiplied by its mass:

mg = ma_ast

By canceling the mass and rearranging the equation, we get:

g = a_ast

Substituting the value of a_ast, we have:

g = (1/8.0)g

Solving for g, we find:

g = 8.0g

Dividing both sides by g, we get:

1 = 8.0

This equation is not true, which means that the assumption that the asteroid experiences a free-fall acceleration 8.0 times smaller than on Earth is incorrect. Therefore, we cannot determine the distance between the asteroid and Earth's surface measured in Earth's radii with the given information.

The equation for the force of gravity on an object near the Earth's surface is F = mg, where F is the gravitational force, m is the mass of the object, and g is the acceleration due to gravity. The acceleration experienced by an object in free fall is equal to the acceleration due to gravity.

In the given problem, we assume that the acceleration experienced by the asteroid is 8.0 times smaller than the acceleration due to gravity on Earth. However, this leads to a contradiction when we equate the gravitational force to the mass of the asteroid multiplied by its acceleration. The equation doesn't hold, indicating that the assumption is incorrect.

Without knowing the actual value of the acceleration experienced by the asteroid or the mass of the asteroid, we cannot determine the distance between the asteroid and the Earth's surface measured in Earth's radii.

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Time = distance / speed

Time = (100 km) / (5.7 km/yr)

Time = 17.5 years

If this is true, then it's not likely that any member of the species has ever traveled 100 km in its lifetime.  Weird !

Both the assertion and the reason given are true.If the mass of the object is less, the acceleration produced by the force will be more. Hence, the acceleration produced by the force is directly proportional to the magnitude of the force and inversely proportional to the mass of the object.

The given assertion: When astronauts throw something in space, that object would continue moving in the same direction and with the same speed; and the given reason: The acceleration of an object produced by a net applied force is directly related to the magnitude of the force, and inversely related to the mass of the object are both correct.Astronauts are capable of throwing objects in space because they are beyond Earth's gravity and do not have to deal with any significant air resistance. In the absence of other forces like friction or air resistance, the initial velocity will be conserved, and the object will continue to move with the same speed and direction. The object would continue to move in a straight line with the same speed because no external force acts on it to change the object's state of motion.Newton's second law states that the force of an object is directly proportional to its acceleration, but inversely proportional to its mass. F=ma, where F is force, m is mass, and a is acceleration. Therefore, if the mass of the object is less, the acceleration produced by the force will be more. Hence, the acceleration produced by the force is directly proportional to the magnitude of the force and inversely proportional to the mass of the object.

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The total metabolic energy used by each to complete the course is determined as 656.91 J.

The kinetic energy of Jessie and Jaime is calculated as follows;

K.E = ¹/₂mv²

where;

15 km/h = 4.17 m/s

5 km/h = 1.39 m/s

K.E = ¹/₂(68)(4.17)² + ¹/₂(68)(1.39)²

K.E = 656.91 J

Thus, the total metabolic energy used by each to complete the course is determined as 656.91 J.

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Answer:

6.32s

Explanation:

Given parameters:

Length of track and distance covered  = 200m

Acceleration  = 10m/s²

Unknown:

Time taken to cover the track  = ?

Solution:

To solve this problem, we apply one of the motion equations as shown below:

       S  = ut + \(\frac{1}{2}\) at²  

S is the distance covered

t is the time taken

a the acceleration

u is the initial velocity

The initial velocity of Superman is 0;

 So;

     S  =  \(\frac{1}{2}\) at²  

        200  =  \(\frac{1}{2}\) x 10 x t²  

          200  = 5t²  

            t²  = 40

            t  = 6.32s

Answer:

A.The atoms vibrate faster due to the conduction of heat through atoms in the spoon.

Answer:

because there is no gravity in space

Explanation:

The weight of an object is a force. It is the force with which a body is attracted toward Earth or another celestial body. This means that when you are in space, away from Earth, objects do not weight anything since they do not feel gravitational attraction to the Earth.

Thus,  the light intensity needs to be equal to or greater than 0.0098 N in order to horizontally suspend the paper in the vertical beam of light.

To horizontally suspend the black paper in a vertical beam of light, the light intensity needs to be strong enough to counteract the force of gravity on the paper.

This means that the light intensity needs to be equal to or greater than the force of gravity on the paper.

The force of gravity on the paper can be calculated using the formula F = m*g, where F is the force, m is the mass, and g is the acceleration due to gravity (approximately 9.8 m/s^2).

Plugging in the values given, we get:

F = 1.0 g * 9.8 m/s^2
F = 0.0098 N

Therefore, the light intensity needs to be equal to or greater than 0.0098 N in order to horizontally suspend the paper in the vertical beam of light.

Note that the dimensions of the vertical beam of light are not relevant to this calculation, as long as the beam is large enough to fully illuminate the paper.

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Hi there!

Recall the equation for electric potential energy for point charges:
\(\boxed{U = \frac{1}{4\pi \epsilon_0} \frac{q_1q_2}{r}}\)

U = Electric potential energy (J)

ε₀ = Permittivity of Free Space (8.85 × 10⁻¹² C/Vm)

q₁, q₂: Charges (C)
r = distance between charges (m)

Solving for r:
3 - (-3) = 6m

Now, plug in the values:

\(U = \frac{1}{4\pi \epsilon_0} \frac{(.00001)(.00001)}{6} = \boxed{1.498 J}\)

A transformer is a device that transfers electrical energy between two or more coils of wire through electromagnetic induction. The primary coil receives electrical energy, while the secondary coil delivers the transformed energy.

In a transformer, the primary coil is connected to the input voltage source, and the secondary coil is connected to the load. When an alternating current flows through the primary coil, it creates a changing magnetic field. This changing magnetic field induces an alternating current in the secondary coil, transferring energy to the load.

The principle behind a transformer is electromagnetic induction, which states that a changing magnetic field induces an electromotive force (EMF) in a nearby conductor. The ratio of the number of turns in the primary and secondary coils determines the voltage transformation. Transformers are widely used in electrical power distribution systems to increase or decrease voltage levels for efficient transmission and distribution of electricity.

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When a light wave hits a medium and is not seen again, the wave has been absorbed. The correct answer is option c).

When a light wave hits a medium, it can either be transmitted through the medium, reflected off the medium, or absorbed by the medium. If the wave is absorbed, it is not seen again because the energy of the wave is converted into another form of energy, such as heat. This is why some materials appear opaque, as they absorb most of the light that hits them.

The absorbed light wave can also excite electrons in the medium, causing them to move to a higher energy level. This can result in the emission of light from the medium, such as in fluorescence or phosphorescence. Encoding, on the other hand, refers to the process of converting information into a different format or language, and is not related to the behavior of light waves in a medium.

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The phrase "parallel adaptive fluid–structure interaction simulation of explosions impacting on building structures" refers to a computational method used to study the effects of explosions on buildings. Let's break it down step by step:

"Parallel adaptive": This refers to the use of parallel computing techniques, where multiple processors or cores work together to solve the simulation problem faster. It allows for efficient computation of complex simulations by dividing the workload.

"Fluid–structure interaction": This term describes the interaction between a fluid (such as air or water) and a solid structure (such as a building) in a simulation. It considers how the fluid affects the structure and vice versa. In this case, it refers to how the explosion impacts the building and how the building responds to the explosion.

"Simulation of explosions impacting on building structures": This means that the simulation aims to model the effects of explosions on buildings. It can help researchers and engineers understand how buildings behave under explosive forces, and can be used to design safer structures or develop strategies to mitigate the damage caused by explosions.

The phrase refers to a computational method that uses parallel computing techniques to simulate the interaction between fluids and structures, specifically focusing on explosions impacting building structures. This simulation can provide valuable insights into the behavior of buildings under explosive forces.

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Answer:

1.7 BTU

Explanation:

q = mCΔT

q = (25 g) (0.9 J/g/°C) (100°C − 20°C)

q = 1800 J

q = 1800 J × (1 BTU / 1055 J)

q = 1.7 BTU

Answer:

True

Explanation:

It is true that. A technician can be electrocuted when working on HEVs or EVs, therefore the correct answer is option A

An EV stands for an electric vehicle. Electric vehicles (EVs) are autos that are powered totally or partially by electricity. Electric cars are extremely cost-effective to run because they have fewer moving parts to maintain and use little to no fossil fuels (petrol or diesel).

When evaluating its environmental impact, every factor must be taken into consideration. Considering that EVs have a minimal overall environmental impact, this suggests that the severity of these production emissions decreases.

Recycling is one strategy for lowering the lifespan emissions of electric vehicles. Again, incorrect assumptions can be refuted by facts.

Thus, That is accurate. The correct response is option A because a technician could electrocute themselves while working on HEVs or EVs.

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