(03.05 LC)
Which of the following best describes the use of a renewable resource

Answer:

the answer is b.

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Answer:

a. Light bulb - electrical to light

b. Firework - chemical to light / thermal / sound

c. Flute - kinetic to sound

d. Leaf-  solar to chemical

(a) For constructive interference the two waves will have higher amplitude of 10 cm.

(b) For destructive interference the two waves will have zero amplitude.

For constructive interference the two waves will have higher amplitude after constructive interference.

Resulting amplitude = 5 cm + 5cm = 10 cm

For destructive interference the two waves will have zero amplitude after destructive interference.

Resulting amplitude = 5 cm - 5cm = 0

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The magnitude of the average velocity of the woodchuck is 0.71 m/s. The average speed of the woodchuck is 3.2 m/s.

Right distance = 19m

Time is taken to cover distance = 4.8s

Left distance = 12m

Time is taken to cover distance = 5s

total displacement = 19 m to the right - 12 m to the left = 7 m to the right

A. To calculate the magnitude of the average velocity, we need to find the total displacement and divide it by the total time.

The total time it took for the woodchuck to run both distances is:

The total time = 4.8 s + 5 s

The total time = 9.8 s

The magnitude of the average velocity is:

v = displacement/time

v  = 7 m / 9.8 s

v = 0.71 m/s

B. To find the average speed, we need to calculate the total distance traveled and divide it by the total time.

The total distance traveled is = 19 m + 12 m = 31 m

The total time it took for the woodchuck to run both distances is:

The average speed = total distance / total time

The average speed = 31 m / 9.8 s = 3.2 m/s

Therefore we can conclude that the magnitude of the average velocity is 0.71 m/s and the average speed is 3.2 m/s.

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The greatest height reached by the ball is approximately 26.74 meters.

The greatest height reached by the ball can be determined using the equation of motion for an object in free fall. When a football is kicked straight up into the air and then falls back down, its motion can be divided into two parts: the upward motion and the downward motion.

During the upward motion, the football is subject to the force of gravity acting in the opposite direction to its velocity. As a result, the football's velocity decreases until it reaches zero at the highest point. The time taken for the football to reach the highest point is equal to half of the total time of flight, which is 4.6 s divided by 2, or 2.3 s.

Using the equation for the displacement of an object in free fall during upward motion, we can calculate the distance traveled by the football. The equation is given as:

s = ut - 0.5 * g * t^2

Where: (highest height attained) is the displacement

The initial velocity in this scenario is u.

The time is t (2.3 s).

The acceleration of gravity is known as g (9.8 m/s2).

The initial displacement is 0 since the football is kicked from the ground up. After entering the values into the formula, we obtain:

0 = 0 * 2.3 - 0.5 * 9.8 * (2.3)^2

Simplifying the equation, we find:

0 = -0.5 * 9.8 * (2.3)^2

Finally, solving for the displacement, we get:

s = 0.5 * 9.8 * (2.3)^2

s ≈ 26.74 meters

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Answer:

T = mg / cos θ

ac = g tan θ

Explanation:

Draw a free body diagram. There are two forces acting on the pendulum bob. A tension force T acting θ from the vertical, and gravity pulling down.

Sum the forces in the y direction:

∑F = ma

T cos θ − mg = 0

T = mg / cos θ

Sum the forces in the centripetal direction (towards the center).

∑F = ma

T sin θ = m ac

ac = T sin θ / m

Substitute for tension T:

ac = (mg / cos θ) sin θ / m

ac = (mg / m) (sin θ / cos θ)

ac = g tan θ

Answer:

See explanation below

Explanation:

In this case, you want to know if you put an object between these forces, which direction would go.

To know this, we need to calculate the moment of an object, which is defined as the product of a force and it's distance. In other words:

M = F * d   (1)

And, in order to reach equilibrium the force will exert a direction in clockwise or anticlosewise, and these moments, should be even:

anticlockwise moment = clockwise moment.

The clockwise would be the forces to the right, and anticlock would the only force to the left of the axle.

Clockwise moment = (10 * 0.8) + (25 * 2.6) = 73 Ns

Anticlockwise moment = 34 * 3.5 = 119 Ns.

As we can see, the moment in the anticlockwise is higher than the actual clockwise moment, therefore, we can assume that the object will move anticlockwise, or simply move to the left.

Hope this helps

Some wave energy can be blanked through the other side in the process

known as Diffraction.

This usually occurs when a wave comes in contact with an obstacle. The

wave will bend itself around the corners of the obstacle so as to enable

its propagation to continue.

The obstructed wave can also pass through an aperture or hole if present

which is one of the important characteristics of waves.

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Answer:

0.015 seconds

Explanation:

5/330=0.015

Answer:

0.015 seconds

Explanation:

divide 5 m and 330 m/s to get 0.015 seconds.

Answer:

it creates a gas called carbon dioxide. The gas begins to expand in the bottle and starts to inflate the balloon

Explanation:

Why does this happen? well, The faster-moving particles inside the bottle start to move faster and faster and soon they expand to fill the balloon.

Answer:

your answer would be D because the waves results from back n forth vibrations of the particles of the medium throught which the sound waves is moving .

A sound wave is a type of wave that requires a medium and in which the vibration is parallel to the motion of the sound.

A wave is form of disturbance that transfers energy form one point to another.

There are two types of waves; mechanical wave and electromagnetic wave.

An example of mechanical wave include;

Thus, we can conclude that a sound wave is a type of wave that requires a medium and in which the vibration is parallel to the motion of the sound.

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the distance covered by the car in this time is 19.73 m.

To determine the minimum time in which a car whose initial velocity is 50 km/h can come to a stop on such a road.

We know that,

F = μkN

By substituting v = 0 m/s in the above equation, we get:0 = (13.8889 m/s)² + 2a(s) ...... (1)

By substituting F = μkN in the expression of acceleration, we get:

a = -μkg

where, g = acceleration due to gravity = 9.8 m/s²Substituting the value of a in Equation (1), we get:

0 = (13.8889 m/s)² - 2(μkg)s

Solving for s, we get:

s = (13.8889 m/s)²/2(μkg)

The time required to stop the car is given by

t = (v - u)/a

Substituting the value of a = -μkg and v = 0, we get:

t = u/μkg

Let's calculate the value of t. So,

t = 13.8889 m/s / 0.5 x 9.8 m/s² = 2.834 s

Hence, the minimum time required by the car to come to a stop is 2.834 s.

The distance covered by the car in this time can be calculated by using the formula:

s = ut + (1/2)at²

Substituting the values of u = 13.8889 m/s, t = 2.834 s, and a = -μkg, we get:

s = 13.8889 m/s × 2.834 s + (1/2)(-0.5 × 9.8 m/s²)(2.834 s)²= 19.73 m

Hence, the distance covered by the car in this time is 19.73 m.

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Cosmic rays are primarily protons with very high energies.

These charged particles travel near the speed of light and originate from various sources in the universe, such as supernovae, active galactic nuclei, and other high-energy astrophysical processes. Cosmic rays can also contain atomic nuclei, electrons, and other subatomic particles. While cosmic rays can interact with strong magnetic fields and produce synchrotron emission, this phenomenon is not the primary definition of cosmic rays. Synchrotron emission occurs when charged particles accelerate in a curved path due to magnetic fields, emitting radiation as a result.

Additionally, cosmic rays are not photons with even higher energy than gamma rays. Photons are massless particles responsible for the transmission of electromagnetic radiation, such as visible light, X-rays, and gamma rays. Although cosmic rays and gamma rays are both high-energy phenomena, they consist of different particle types and have distinct sources.

In summary, cosmic rays are primarily high-energy protons, accompanied by other particles, originating from various astrophysical processes. They differ from photons and are not solely characterized by synchrotron emission from strong magnetic fields. Understanding cosmic rays helps us study the universe and its most energetic events.

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The trip takes a total of 1.5 hours and has an average speed of 40 mph.

To calculate the time taken for each leg of the trip, we can use the formula time = distance/speed.

For the first leg of the trip, the car travels 15 miles at a speed of 45 mph. Using the formula, we find that the time taken for this leg is 15/45 = 0.33 hours.

For the second leg of the trip, the car travels another 15 miles but at a speed of 30 mph. Using the formula, we find that the time taken for this leg is 15/30 = 0.5 hours.

To find the total time for the trip, we add the times for each leg: 0.33 hours + 0.5 hours = 0.83 hours.

To calculate the average speed for the entire trip, we use the formula average speed = total distance/total time. The total distance traveled is 15 miles + 15 miles = 30 miles. The total time taken is 0.83 hours. Plugging these values into the formula, we find that the average speed for the trip is 30/0.83 = 36.14 mph.

Therefore, the trip takes a total of 1.5 hours and has an average speed of 40 mph.

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Answer:

Explanation:

60 times 5=300+24=324

207/324= aveage i dont have a calculator

use the average and mutiple by 88 minutes

Answer:

The correct option is (c) "it bounces the light towards a focal point"

Explanation:

There are two types of spherical mirrors i.e. concave and convex.

A concave mirror is a type of spherical mirror that is curved inwards. For this type of mirror the rays of light are bounced back and converge to the focal point of the mirror.

So, the correct option is (c).

Answer:

c

Explanation:

Answer:

7.5 x 10⁻⁸N

Explanation:

Given parameters:

Mass 1  = 60kg

Mass 2  = 75kg

Distance between the bodies  = 2m

Unknown:

Gravitational fore  = ?

Solution:

The gravitational force between the two bodies can be derived using;

  F  = \(\frac{G mass 1 x mass 2}{distance^{2} }\)  

    G is the universal gravitation constant  = 6.67 x 10⁻¹¹m³kg⁻¹s⁻²

Insert the parameters and solve;

  F  = \(\frac{6.67 x 10^{-11} x 60 x 75}{2^{2} }\)   = 7.5 x 10⁻⁸N

In this case, the gravitational pull of planet C caused planet B to speed up, which altered its trajectory and caused it to reach the point of closest approach to planet C before the point of closest approach to planet A.

The residents of planet B expected the distances of closest approach to their neighbors A and C to be the same on October 1, 2065. However, this is not what they found.

Instead, they found out that the distance of closest approach to planet C was greater than the distance of closest approach to planet A.The reason for the discrepancy is that the gravitational pull of planet C caused planet B to accelerate, which made it move faster in its orbit.

As a result, planet B moved ahead of its expected position in its orbit, which caused it to reach the point of closest approach to planet C before the point of closest approach to planet A.This effect is known as the gravitational slingshot effect, which happens when a spacecraft or planet uses the gravity of a celestial body to increase its speed and alter its trajectory.

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Answer:

do you mean before we used fossil fuels? steam.before steam? fire was used for like ...125,000 years ago. we were not smart back then but we were smart enough.

Explanation:

Answer:

the answer to this question is A globular cluster

The speed of the n-th observer relative to the first observer is n time the number of observers.

The relative velocity is described as the velocity of an item with appreciation to some other observer. it's miles the time fee of change of relative role of one object with recognize to some other item.

Absolutely the speed of an item is its velocity with appreciation to a hard and fast coordinate system, while the relative velocity of two objects is the difference among their velocities with appreciation to every other. The concept of relative movement speed in a plane is pretty much just to the entire idea of relative pace in an immediate line. considering various events, we take in more than one object moving in a body which is non-stationary in admiration to another viewer.

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The main advantage of the scientific method is that it is a systematic and objective way to acquire knowledge. The scientific method is a process for acquiring knowledge that has been used to great success in understanding the physical world. Astrology, on the other hand, is based on subjective interpretations of the positions of the stars and planets.

The scientific method is a process for acquiring knowledge that has been used to great success in understanding the physical world. It is based on the following steps:

1. **Observation:** The scientist observes a phenomenon and asks questions about it.

2. **Hypothesis:** The scientist proposes a hypothesis, or a possible explanation for the phenomenon.

3. **Experimentation:** The scientist designs experiments to test the hypothesis.

4. **Data analysis:** The scientist collects data from the experiments and analyzes it.

5. **Conclusion:** The scientist draws a conclusion about the hypothesis based on the data analysis.

The scientific method is an iterative process, meaning that the scientist may go back and forth between the different steps as needed.

Astrology, on the other hand, is a system of divination that attempts to predict future events by interpreting the positions of the stars and planets. Astrology is not based on the scientific method, and there is no evidence that it is a reliable way to predict the future.

The main advantage of the scientific method is that it is a systematic and objective way to acquire knowledge. The steps of the scientific method are designed to minimize bias and to ensure that the results of the experiments are repeatable. This makes the scientific method a reliable way to learn about the physical world.

Astrology, on the other hand, is based on subjective interpretations of the positions of the stars and planets. There is no scientific evidence to support the claims of astrology, and the results of astrological predictions are not repeatable.

In conclusion, the scientific method is a more reliable way to understand the physical world than astrology. The scientific method is based on a systematic and objective approach to acquiring knowledge, while astrology is based on subjective interpretations of the positions of the stars and planets.

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The given statement " when a cold ice cube is dropped into a warm cup of water, energy is transferred as heat from the ice to the water." is true. This is because  When a cold ice cube is dropped into a warm cup of water, heat flows from the warmer water to the colder ice cube until they reach thermal equilibrium, i.e., the same temperature.

Heat transfer occurs when there is a temperature difference between two objects or systems. In this scenario, the ice cube is at a lower temperature than the warm cup of water. Therefore, heat will flow from the warmer water to the colder ice cube until both objects reach the same temperature, which is the point of thermal equilibrium. This heat transfer occurs through a process called conduction, which involves the transfer of heat through molecular collisions between the two objects in contact. As the ice cube absorbs heat from the water, it will start to melt and eventually reach the same temperature as the water. The amount of heat transferred can be calculated using the specific heat of water and ice, and the masses and initial temperatures of the two substances.

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Answer:

D

Explanation:

Because it is impossible for it to show the real depth of the ocean and how deep it is

The density of an object remains same irrespective of its shape, size and quantity.

Explanation:

Density is an intensive property. This means that regardless of the object's shape, size, or quantity, the density of that substance will always be the same. Even if you cut the object into a million pieces, they would still each have the same density. It is because density in an intensive property of matter.

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Answer:

383.2

Explanation:

W=m×g(9.8)×(change in height)

=3×9.8× (45-32)

=3×9.8×13

=383.2

a.The time it will take the sphere to cool by 1. 00 K due to its radiation of heat energy is  3225s.

b. The fractional change in the heat current H when the temperature changes from 300 K to 299 K is 3.18 %.

(a) The rate of cooling of a copper sphere is given by Newton's law of cooling, i.e.,

H = kA(Ts - T0),

where k is the heat-transfer coefficient, A is the surface area of the sphere, Ts is the temperature of the surroundings, and T0 is the temperature of the sphere.

Since the surroundings are very cold, Ts can be taken to be zero.The heat transfer coefficient k depends on the emissivity e of the sphere and is given by:

k = σeA,

where σ is the Stefan-Boltzmann constant.

The surface area A of the sphere is:

A = 4πr²,

where r is the radius of the sphere.

The heat transfer coefficient k is therefore k = 4πr²σe.

Substituting the values of the parameters for the copper sphere in the above equations, we get

k = 4π(0.05 m)²(5.67 × 10^-8 W/m²K⁴)(1) = 0.0562 W/m²K⁴

H = kA(Ts - T0) = 0.0562(4π(0.05 m)²)(300 K - 0) = 1.41 W.

The rate of cooling of the sphere is therefore 1.41 W.

The heat capacity C of the sphere is given by

C = mCp,

where m is the mass of the sphere and Cp is the specific heat capacity of copper.

The mass of the sphere is m = (4/3)πr³ρ= (4/3)π(0.05 m)³(8900 kg/m³) = 0.0118 kg

The specific heat capacity of copper is Cp = 385 J/kgK.

The heat capacity of the sphere is therefore

C = 0.0118 kg × 385 J/kgK = 4.54 J/K.

The time Δt taken for the sphere to cool by ΔT = 1.00 K is given by

Δt = ΔQ/H = CΔT/H = (4.54 J/K)/(1.41 W) ≈ 3225s.

(b) The fractional change in the heat current H when the temperature changes from 300 K to 299 K is given by

ΔH/H = (dH/dT)ΔT/H,

where ΔT is the change in temperature and dH/dT is the rate of change of the heat current H with temperature.

To find dH/dT, we differentiate the equation

H = kA(Ts - T0) with respect to T and get dH/dT = -kA = -4πr²σe.

Substituting the values of the parameters for the copper sphere, we get

dH/dT = -4π(0.05 m)²(5.67 × 10^-8 W/m²K⁴)(1) = -0.0449 W/K/m².

The fractional change in the heat current is therefore:

ΔH/H = (dH/dT)ΔT/H = (-0.0449 W/K/m²)(-1 K)/(1.41 W) = 0.0318 or 3.18%.

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The moment of inertia of the flywheel is 2.63 kg-\(m^{2}\)

It is given that,

The maximum energy stored on the flywheel is given as

E=3.7MJ= 3.7×\(10^{6}\) J

Angular velocity of the flywheel is 16000\(\frac{rev}{min}\) = 1675.51\(\frac{rad}{sec}\)

So to find the moment of inertia of the flywheel. The energy of a flywheel in rotational kinematics is given by :

E = \(\frac{1}{2}\)\(Iw^{2}\)

By rearranging the equation:

I = \(\frac{2E}{w_{2} }\)

I = 2.63 kg-\(m^{2}\)

Thus the moment of inertia of the flywheel is 2.63 kg-\(m^{2}\).

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The acceleration of the plane will be −8 m/s²

How to find the acceleration of a plane?

Acceleration is the rate of change in velocity over time (Δv/t).

Given, that the initial velocity of the plane u=480 m/s

The final velocity of the plane is zero after landing, v= 0 m/s

t= 1 minute= 60 seconds

we know, v=u + at

0= 480 + 60a

a=\(\frac{-480}{60}\)  = -8m/s²

Thus, the acceleration of the plane is -8 m/s²

(negative acceleration implies that the object is slowing down)

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