Which statement correctly describes a property of sound waves?

They have two kinds of movement.


They can travel through outer space.


They are generated by movements in Earth’s crust.


They require particles to transfer energy.

Unless the two forces are parallel to each other, the two will produce a net torque that will cause rotation.

The circular movement of an object about a central axis is referred to as rotation or spin. A two-dimensional spinning object can rotate in either a clockwise or counterclockwise direction and has just one potential central axis. There are countless conceivable central axes and rotating directions for three-dimensional objects.

An imaginary line is referred to as a rotation axis if it is the center of rotation for three-dimensional objects such as the earth, moon, and other planets. The body is said to spin or revolve upon itself if the axis passes through the center of mass of the object.

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7.5 percent of the green house gases emission resulted from industrial, agricultural, and waste management processes.

The greenhouse gas emissions of the transportation industry account for around 28 percent of all emissions in the U.S., making it the largest contributor to U.S. greenhouse gas emissions. In 2021 this equated to 1.8 billion tons of carbon dioxide being released into the atmosphere.

About 92 percent (or 4.6 BMT) of U.S. CO2 emissions stemmed from burning fossil fuels to produce energy. The remaining 7.5 percent of those emissions were unrelated to energy production; they resulted from industrial, agricultural, and waste management processes.

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The work done by the teacher can be calculated using the equation:

work = force x distance x cos(θ)

Here, the force is 10 N, the distance is 20 feet (converted to meters) and the angle between the direction of force and distance is 0 degrees, so cos(0) = 1.

So, work = 10 N x 20 feet x 0.3048 m/foot x 1 = 60.96 J

The teacher did 60.96 joules of work.

The electric field strength of this field on the charge molecule is 31358.5N/C.

Electric field strength can be defined as a quantitative expression of the intensity of an electric field at a particular location. The electric field strength can be calculated:

E = ∣q∣/4πε₀r²

q = +129 nC

r = 5.2m

E = 129 × 10⁻⁹ × 8.99 × 10⁹ ×  (5.2)²

E = 1159.71 × 27.04

E = 31358.5N/C

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The percent error in approximating the number of seconds in a year is 0.45%.

Percent error is the difference between the experimental value and actual value and measures the accuracy of the result found.

The percent error is given by the formula,

Percent error = {(actual value- experimental value) / actual value} ×100

Here, the experimental value is π×10⁷.

And the actual value is, (365.24)(24)(60)(60) = 3.155×10⁷.

Substituting the values in the formula,

Percent error = {(3.155×10⁷ - π×10⁷) / 3.155×10⁷} ×100

Percent error = (0.015 / 3.155) ×100

Percent error =0.0045 ×100

Percent error = 0.45%

The percent error is 45%.

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The comparation of the acceleration of a motorcycle with the acceleration of a bicycle is 1 : 2. The result is obtained by using the formula for acceleration.

Acceleration is the rate of change in velocity of an object with respect to time. It can be expressed as

a = Δv/Δt

Where

Compare the acceleration of

The acceleration of a motorcycle is

a₁ = (v₁ - v₀)/Δt₀

a₁ = (100 - 90)/Δt₀

a₁ = 10/Δt₀

The acceleration of a bicycle is

a₂ = (v₃ - v₂)/Δt₁

a₂ = (10 - 0)/½Δt₀

a₂ = 10/½Δt₀

a₂ = 20/Δt₀

The comparation (ratio) of a₁ and a₂

a₁ ÷ a₂ = 10/Δt₀ ÷ 20/Δt₀

a₁ ÷ a₂ = 1 ÷ 2

Hence, the ratio of the acceleration of a motorcycle and a bicycle is 1 : 2.

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The constant rate of change that the car is traveling on this interval or the velocity of the car is 1.25 miles per minute.

The velocity of an object is the rate of change of the displacement of an object with time.

Mathematically;

The velocity of an object = change in displacement / change in time.

The constant rate of change that the car is traveling on the given interval is calculated below as follows:

Change in displacement = 29 miles - 24 miles

Change in displacement = 5 miles

Change in time = 5.04 pm - 4:00 pm

Change in time = 4 minutes

Velocity = 5 miles / 4 minutes

Velocity = 1.25 miles /min

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If magnet A and magnet B  are brought into contact with one another, they may either repeals (if same pole come in contact) or attract (if opposite pole come in contact).

A substance or thing that creates a magnetic field is called a magnet. The most noteworthy characteristic of a magnet—a force that pulls on other ferromagnetic elements, such as iron, steel, nickel, cobalt, etc.

The benefits of nuclear energy is: it is carbon-free electricity and reliable energy source.

The risks associated with nuclear energy are: nuclear waste, malfunctions can be catastrophic.

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Answer:

420

Explanation:

Heat required(Q)= m*c*

So Q=21000J

Power=50Wt

time= Q/Power

time=21000/50 sec

time=420seconds

Answer:

The half-life of a radioactive substance is the amount of time it takes for half of the initial amount of the substance to decay. In this case, the initial number of atoms decayed to half of the initial number after 128 days. So the half-life of the radioactive substance is 128 days.

For the reaction A(aq)→B(aq) the average rate of disappearance Of A = - Δ.

Define  aqueous reaction?

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The value of the force is 6.012 × 10⁻⁴ N and direction is downward, as it is the force exerted by the upper plate on the lower plate.

Force is a physical phenomenon that is the result of interactions between objects, and is defined as a push or pull on an object. It can be created by various forms of energy, such as electrical, mechanical, thermal, or magnetic.

The force on the lower plate is equal to the shear stress on the plate times the area of the plate. The shear stress is determined using the velocity profile, which in this case is given by (u / u_max ) = 1 - ( 2y/h )^2.
Plugging in the values for the maximum speed, distance between the plates, and temperature, we can calculate the dynamic viscosity of water as η = 0.001002 Pa * s.
The shear stress is then calculated as τ = η*(du/d y). Taking the derivative of the velocity profile and plugging in the values for the maximum speed and distance between the plates, we get τ = η * ( 4u_max/h ).
Finally, the force on the 0.3 m^2 section of the lower plate is calculated as F = τ*A, where A is the area of the plate. Plugging in the values for the shear stress and plate area, we get F = (0.001002 Pa * s ) * (4 * 0.05 m/s/5 mm) * (0.3 m^2)

= 0.0006012 N.

= 6.012 × 10⁻⁴ N

The direction of the force is downward, as it is the force exerted by the upper plate on the lower plate.

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Textbooks, scientific journals, and online tutorials and are the three resources that can be used and accessed for full explanations regarding how to complete the lab exercises.

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Explanation:

By using the formula :

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

where;

S = distance

u = initial velocity

t = time taken

a = acceleration

Plug in all the information we have,

[tex]1 = 0 + \frac{1}{2} a(3) {}^{2} [/tex]

therefore :

[tex]a = \frac{2}{9} ms {}^{ - 2} [/tex]

Astronomers have found many different kinds of objects beyond earth. the sun is an example of a star, which is a giant gaseous ball. Round objects that revolve around (orbit) a star are called Planets. Large collections of billions of stars, like the milky way, are called galaxy . Moons are smaller objects that orbit a planet . Astronomers call the sum total of everything that is out there the universe .

The entire universe is made up of space and all the stuff and energy it contains. Even time is a part of it, and you are obviously a part of it.

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The lake is 14.76 meters deep.

The velocity of the lead ball just before it hits the water can be calculated using the equation of motion for a freely falling object:

v = v0 + a*t,

where v is the final velocity,

v0 is the initial velocity (0 m/s, since the ball was dropped),

a is the acceleration due to gravity (-9.8 m/s^2),

and t is the time it takes for the ball to reach the water (5.30 m / 9.8 m/s^2 = 0.54 s).

v = v0 + a*t

= 0 + (-9.8 m/s^2) * 0.54 s

= -5.27 m/s.

The depth of the lake can be calculated using the equation:

d = v0*t + (1/2)at^2,

where d is the depth of the lake,

t is the time it takes for the ball to reach the bottom after hitting the water (3.30 s - 0.54 s = 2.76 s),

and a is the acceleration due to gravity (-9.8 m/s^2).

d = v0*t + (1/2)at^2

= (-5.27 m/s) * 2.76 s + (1/2) * (-9.8 m/s^2) * 2.76 s^2

= -14.76 m.

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The students would need to wave hands up and down to have a transverse wave.

A transverse wave is a type of wave where the vibration is perpendicular to the direction of wave propagation.

We have to note that in this case we have been told that  students stand in a circle and are told to make a transverse wave. The students would have to wave the hands up and down to make a transverse wave. In this was the wave  that we are able to obtain form the movement of the students is found to be transverse.

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(a) Chlorophyll makes grass green and (c) Tides are caused by the Moon.

are scientific hypotheses so options A & C are correct.

A scientific hypothesis is a proposed explanation for a phenomenon in the natural world that is testable through experimentation and observation.

(a) Chlorophyll makes grass green is a scientific hypothesis because it proposes a cause-and-effect relationship between the presence of chlorophyll in the grass and the green color of grass.

This hypothesis can be tested through experiments that manipulate the presence of chlorophyll and measure the changes in the color of grass.

(b) Earth rotates about its axis because living things need an alternation of light and darkness is not a scientific hypothesis because it is based on a teleological (i.e., purpose-driven)

It goes against the scientific method that seeks to explain natural phenomena in terms of natural causes rather than invoking supernatural or purposive causes.

(c) Tides are caused by the Moon is a scientific hypothesis because it proposes a cause-and-effect relationship between the gravitational pull of the Moon and the rise and fall of ocean tides.

This hypothesis can be tested through experiments that measure the tides and the Moon's position and gravitational influence.

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Answer:

To find the magnitude and direction of the resultant force F₁ + F₂, you can use the following graphical method:

Draw an arrow to represent F₁ with a length of 6.00 units and an angle of 30.0° above the x-axis. Then draw an arrow to represent F₂ with a length of 5.00 units and an angle of 90° along the y-axis. Finally, draw a vector connecting the two arrows to represent the resultant force. The magnitude of the resultant vector can be measured with a ruler, and the direction can be measured with a protractor. The magnitude of the resultant vector is approximately 8.06 units, and the direction is approximately 35.9° above the x-axis.

Answer:

To find the magnitude and direction of the resultant force F1 + F2, we can use the parallelogram method or the tail-to-tail method.

Using the parallelogram method, we would begin by drawing the vectors F1 and F2, with F1 having a magnitude of 6.00 units and a direction of 30.0° above the positive x axis, and F2 having a magnitude of 5.00 units and a direction of the positive y axis. We would then draw a diagonal from the tail of F1 to the head of F2 and another diagonal from the tail of F2 to the head of F1. The point where the diagonals intersect is the head of the resultant vector F1 + F2.

Using the tail-to-tail method, we would begin by placing the tail of F1 at the tail of F2, then drawing a vector from the head of F1 to the head of F2. The resulting vector would be the same as the one obtained with the parallelogram method.

The magnitude of the resultant force F1 + F2 can be found by using the Pythagorean theorem. The horizontal component of the force is 6.00cos(30) = 5.00 units and the vertical component is 6.00sin(30) = 3.00 units. So, the magnitude is sqrt(5^2 + 3^2)= sqrt(25+9) = sqrt(34) = 5.83 units.

The direction of the resultant force F1 + F2 can be found by using trigonometry. The tangent of the angle is 3/5, so the angle is arctan(3/5) = approximately 36.87 degrees counterclockwise from the positive x-axis.

So, the magnitude of the resultant force is 5.83 units and the direction is 36.87 degrees counterclockwise from the positive x-axis.

The acute angle of the parallelogram is approximately 53.7 degrees.

The area of a parallelogram is equal to the product of its base and height, so we can write the equation:

A = b x h

where A is the area (1801), b is one of the sides (19), and h is the height.

The height of the parallelogram can be found by dividing the area by the base:

h = A / b = 1801 / 19 = 94.95

To find the angle, we can use the trigonometric function tangent:

tan(theta) = h / l

where theta is the acute angle of the parallelogram,

h is the height (94.95), and

l is the other side length (99).

Calculating the tangent and using the inverse tangent function to find the angle:

[tex]\theta = tan^{-1(h / l)} = tan^{-1(94.95 / 99)}[/tex]

= [tex]tan^{-1(0.9604)}[/tex]

= 53.7 degrees (to the nearest tenth of a degree)

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Bob drives the getaway car after the massive bank robbery. When his headlights reveal a nail strip 140 m ahead, he's going 50 m/s. Bob escaped jail.

Bob's initial speed was 50 m/s and his reaction time was 0.8 s, so his braking distance can be calculated using the equation:

Where:

Substituting the values, we get:

So if Bob's stopping distance is less than 140 m, he can stop in time and escape. Since 43.2 m is less than 140 m, Bob is not in jail and has escaped.

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The electric force in y-direction on upper drop is, -41.055 N.

The net force on y- direction is the sum of the forces on upper drop due to the two drops on x-axis.

Charge on upper drop is, -1.72 μC.

The charges are 769 nC = 0.769 μC

The distance between upper drop and the charge on x-axis is,

[tex]\sqrt{{1.09}^2+{12.8}^2}\ mm[/tex]

= 12.84 mm

Force between two charges q1 and q2 placed at a distance r is,

[tex]F = \dfrac{kq_{1}q_{2}}{r^2}[/tex]

The angle between y- axis and direction of force is, 4.867°.

The y-component of force on upper drop is,

[tex]F = \dfrac{k(0.769)(-1.72)}{0.00284^2} \times 10^{-12} \cos{4.867^{0}} + \dfrac{k(0.769)(-1.72)}{0.00284^2} \times 10^{-12} \cos{4.867^{0}} \\F = - 2 \times \dfrac{k(1.323)}{8.0656} \times 10^{-12+6} \cos{4.867^{0}} \\F = - 2 \times \dfrac{4 \pi \ 10^{-7}(1.323)}{8.0656} \times 10^{-6} \times \cos{4.867^{0}}[/tex]

Solving further,

[tex]F = - 2 \times \dfrac{4 \pi \ 10^{7}(1.323)}{8.0656} \times 10^{-6} \times 0.996 \\F = - 4.122 \times 10 \times 0.996\\F = -41.055 N[/tex]

The force in y-direction on upper drop is, -41.055 N.

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Yes, Actually most of the kinetic energy lost here to thermal energy and sound. and there's also some energy imparted to the rest of the apparatus through the forward component of force the pendulum exerts on its upper support. the fraction lost for this totally inelastic collision is strictly dependent on the mass ratio of ball pendulum.

What is Velocity ?

The vector quantity of velocity describes the speed at which an object's position is changing. It is determined by dividing an object's displacement over a specified period of time. The standard unit of velocity is metres per second (m/s), and it has both magnitude and direction.

The velocity of an object can change over time due to acceleration, and if an object is moving in a circular path, it also has a component of velocity perpendicular to its direction of motion, known as centripetal  velocity.

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If the potential throughout a particular region is constant, the field throughout that region must be zero.[CORRECT]

The following are the characteristics of potential energy

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The Q-value (in Mev) for the reaction

MeV and this reaction is endothermic.

The Q-value (in Mev) for the reaction

11P + 49Be ======> 59B + 01n is -10.7 MeV and this reaction is exothermic.

The Q-value (in Mev) for the reaction

11P + 49Be ======> 49Be + 11P is 17.4 MeV and this reaction is exothermic.

The Q-value (in Mev) for the reaction

11P + 49Be ======> 48Be + 12H is -4.2

MeV and this reaction is endothermic.

The Q-value (in Mev) for the reaction

11P + 49Be ======> 47Be + 13H is -3.3

MeV and this reaction is endothermic.

The Q-value (in Mev) for the reaction 11P + 49Be ======> 36Li + 24He is -7.5 MeV and this reaction is exothermic.

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Answer:

Below

Explanation:

The gravitational Potential Energy due to height will be converted to Kinetic Energy at the low point bottom:

PE = KE

mgh = 1/2 mv^2     divide by m

gh = 1/2 v^2

h = 1/2 v^2 / g = 1/2 * 30^2 / 9.81 = 45.9 m

Answer:

Wouldn't it be 0 because that's when the ball stops?

Explanation:

The mass of the object is 8.5 kg.

The equation used in this question is Newton's Second Law of Motion, Newton's Second Law of Motion states that force equals mass times acceleration. This means that the more mass an object has, the more force is needed to move it, and the greater the acceleration, the more force is needed to move it. (F = ma).

The steps for calculating mass are as follows

1. The formula to calculate the mass of an object from a given force and acceleration is mass = force/acceleration.

2. Therefore, to calculate the mass of the object, divide the given force of 34 N by the given acceleration of 4.0 m/s².

3. This gives a mass of 8.5 kg.

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A tube in which the cross-sectional area gradually decreases to a minimum diameter in its center section is called a “_converging duct__”

Tube is a pipe shape, a cylinder with a hollow space inside. Tubes are used in applications such as medical devices that require a precise outside diameter. The outside diameter is important since it will indicate how much it can hold as a stability factor.

Therefore, Tube is a cylindrical, hollow piece with a round or oval profile, made of plastic, paperboard, aluminum, or other metal.

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The glider's velocity just after the skydiver let's go is 41.68 m/s

It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).

The given parameters;

Calculating the speed of the glider when the skydiver is released with the principle of conservation of linear momentum:

mass of the glider without the person, m2 = 680 kg - 60 kg

mass of the glider without the person, m2 = 620 kg

initial momentum of the glider = final momentum of the glider

m1*v1 = m2*v2

v2 = (m1*v1)/ m2

v2 = (680*38)/ 620

v2 = 41.68 m/s

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