How does sound travel? *
Air molecules move in a straight line in one direction.
Air molecules move in waves that sometimes bounce back.
Air molecules move in waves in one direction.
None of the above.

1.7 m/s is the horizontal velocity that is required to clear the rocks.

As the jumper runs off a 15 m high cliff.

And according to the question,  starts with 0 velocities in the start direction thus he covers 15 m.

Given,

x = 15 m

a = g = 9.8 m, which is the acceleration due to gravity.

iv is the initial velocity which is 0, vo = 0

vf is the final velocity,

Using 2nd equations of motion,

x = iv × t + (1 ÷ 2) a × t²

15 = 0 + ((1 ÷ 2) × ( 9.8) × t²)

t = 1.75

Thus, the time is 1.75 seconds.

Using the same equation, horizontal velocity will be:

x = iv × t + (1 ÷ 2) a × t²

3 = vf × (1.75) + 1 ÷ 2 × (0) × (1.75)

vf = 1.7

Therefore, The horizontal velocity required to cover the rocks is 1.7 m/s.

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The force F1 is equal and opposite to the downward force thus, F1 is equal to 60 N. The force F2 is inclined to 30 ° from leftward force and it is equal to 38.97 N in magnitude.

Force is an external agent acting on a body to deform it or to change its state of motion or rest. Force is a vector quantity and it is characterised by its magnitude and direction.

If two forces acting on a body from the same directions, then the net force will be the sum of these two forces. If they are acting from opposite directions, they will cancel each other in magnitude.

The force F1 is equal and opposite to the force acting downward. Thus its magnitude is 60 N. The force F2 is inclined to 30 ° from horizontal direction.

F2 = 45 cos 30 = 38.9 N.

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Answer:

D. OJ

Explanation:

Bonjour à toi,

An electrically neutral object does not mean that it has no electrical charge. If today we find some elementary particles without electric charge (Higgs Boson, photon and gluon), the neutrality of the atom and molecules, or more globally of matter is due to various processes. An atom is electrically neutral because the electric charges that compose it compensate each other (as much negative charge, the electron, as positive, the proton). Ionic molecules arrange themselves so that the electric charges that compose them compensate each other.

In constructive interference, waves that are in phase will combine together and increase the amplitude. In destructive interference, waves are out of phase and cancel one another out.

When two waves occupy the same point, superposition occurs. ... Constructive interference is when two waves superimpose and the resulting wave has a higher amplitude than the previous waves. Destructive interference is when two waves superimpose and cancel each other out, leading to a lower amplitude.

Answer:

127.4 newtons

Explanation:

Assuming g = 9.8:

F = ma = 13(9.8) = 127.4 N

The force of a 13 Kilogram ball that has been dropped and has fallen for 1 second, then the force offered by the ball would be 127.53 Newtons.

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

As given in the problem we have to find the force of a 13-kilogram ball that has been dropped and has fallen for 1 second,

The force of the dropped ball = mass of the ball × acceleration due to gravity

The force of the dropped ball = 13 × 9.81

                                                  = 127.53 Newtons

Thus , the force of a 13kg ball that has been dropped and has fallen for 1 second would be 127.53 Newtons.

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Answer:

Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.

Explanation:

Answer:

meat

Explanation:

ewwww

Answer:

a = 5.33 [m/s²]

Explanation:

To solve this problem we must use Newton's second law which tells us that the sum of the forces acting on a body is equal to the product of mass by acceleration.

ΣF = m*a

where:

F = force = 400 [N]

m = mass = 75 [kg]

a = F/m

a = 400/75

a = 5.33 [m/s²]

Option C, "The objective forms a virtual image," is normally not a characteristic of a simple two-lens refracting astronomical telescope.

A simple two-lens refracting astronomical telescope typically consists of an objective lens and an eyepiece lens. The objective lens forms a real image at its focal point, and the eyepiece lens magnifies and focuses this image for the observer.

Option A states that the angular size of the final image is larger than that of the object. This is typically true for telescopes as they are designed to magnify distant objects and make them appear larger.

Option B states that the final image is virtual. In a refracting telescope, the final image is virtual, meaning it appears to be formed behind the eyepiece. This is a characteristic of such telescopes.

Option C states that the objective forms a virtual image. However, in a simple two-lens refracting astronomical telescope, the objective lens forms a real image at its focal point. The eyepiece then magnifies this real image to create the final virtual image.

Option D states that the final image is inverted. This is generally true for refracting telescopes, as the light rays undergo refraction at both the objective and eyepiece lenses, resulting in an inverted image. Therefore, the characteristic that is normally not associated with a simple two-lens refracting astronomical telescope is option C, which states that the objective forms a virtual image.

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The Earth must absorb a certain amount of energy when a meteoroid with a mass of 783,000 kg impacts at a speed of 39 km/s. the TNT equivalent of the energy absorbed by the Earth from this meteoroid is approximately 109.73 kilotons.

To calculate the energy absorbed by the Earth, we can use the kinetic energy formula:\(E = (1/2)mv^2\), where E is the energy, m is the mass, and v is the velocity. Plugging in the given values, we have \(E = (1/2) * 783,000 kg * (39,000 m/s)^2\). Simplifying the equation, we find that the energy is approximately \(4.58817 * 10^1^4\)joules.

To determine the TNT equivalent of this energy, we divide the energy by the energy released by one kiloton of TNT, which is \(4.184 * 10^1^2\) joules. Doing the calculation, we find that the TNT equivalent of the energy absorbed by the Earth from this meteoroid is approximately 109.73 kilotons.

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Answer: For example you can tell that metal are metal because of their luster (shine) and their hardness. There are other ways to classify objects by physical properties

- Chilio

The centripetal force acting on the ball will be 23.26 N.The direction of the centripetal force is always in the path of the center of the course.

The force needed to move a body in a curved way is understood as centripetal force. This is a force that can be sensed from both the fixed frame and the spinning body's frame of concern.

The given data in the problem is;

m is the mass of A ball = 0.25 kg

r is the radius of circle= 1.6 m rope

v is the tangential speed = 12.2 m/s

\(\rm F_C\) is the centripetal force acting on the ball

The centripetal force is found as;

\(\rm F_C = \frac{mv^2}{r} \\\\ F_C = \frac{0.25 \times (12.2)^2}{1.6} \\\\ F_C=23.26\ N\)

Hence the centripetal force acting on the ball will be 23.26 N.

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Answer:

(b)

Explanation:

23 N

Answer:

There would be no "seasons"

The person would always be subjected to the same amount of sunlight.

Since the earth is tilted at about 23 deg, a person at  that latitude would be subjected to sunlight from overhead to sunlight that appears 46 deg N of vertical.

Explanation:

Given:

v₀ = 5.0 m/s

a = 2.5 m/s²

Equation:

Δx = v₀ t + ½ at²

Δx = (5.0 m/s) t + ½ (2.5 m/s²) t²

Δx = 5t + 1.25t²

Make a table of data using 1.0 increments for t.

\(\left[\begin{array}{cc}t&\Delta x\\0&0\\1.0&6.25\\2.0&15.00\\3.0&26.25\\4.0&40.00\\5.0&56.25\end{array}\right]\)

Graph the data.  See included image.

In this exercise we derive a kinematic formula, create an arbitrary set of points and introduce the resulting curve on a Cartesian plane.

Physically speaking, this ball experiments an uniform acceleration, that is, its velocity changes uniformly in time. In this question we are going to apply this procedure:

1) Derive the kinematic formula for the position of a ball accelerated uniformly in time.

2) Create an arbitrary set of distinct ordered pairs with the position of the ball in time.

3) Set every point on a Cartesian plane.

4) Create the curve by matching all points.

The equation for the position of the ball in time is:

\(x = x_{o} + v_{o}\cdot t + \frac{1}{2}\cdot a\cdot t^{2}\) (1)

Where:

\(x_{o}\) - Initial position, in meters.

\(x\) - Final position, in meters.

\(v_{o}\) - Initial speed, in meters per second.

\(t\) - Time, in seconds.

\(a\) - Acceleration, in meters per square second.

If we know that \(x_{o} = 0\,m\), \(v_{o} = 5\,\frac{m}{s}\) and \(a = 2.5\,\frac{m}{s^{2}}\), then we derive the formula and obtain all set of ordered pairs:

\(x = 5\cdot t +1.25\cdot t^{2}\) (1b)

t = 0 s.

\((t, x) = (0\,s, 0\,m)\)

t = 1 s.

\((t, x) = (1\,s, 6.25\,m)\)

t = 2 s.

\((t, x) = (2\,s, 15\,m)\)

t = 3 s.

\((t, x) = (3\,s, 26.25\,m)\)

t = 4 s.

\((t, x) = (4\,s, 40\,m)\)

t = 5 s.

\((t,x) = (5\,s, 56.25\,m)\)

Now create the graph, which is included below as an attachment.

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2 x 10⁻¹⁸ C is the charge on each of the pieces.

In physics, Charge is electric charge, electrical charge, or electrostatic charge and symbolized as q, is a characteristic of a unit of matter that expresses the extent to which it has more or fewer electrons than protons.

According to the question,

Fс = 4 x 10⁻²³ N

d = 0.03 m  , k = 9.0 x 10⁹ N·m²/C²

q =?

The force exerted by one charge q on another charge Q a distance r away is given by:

Coulomb's law:

Fc =\(\frac{kq_{1} q_{2} }{d^{2} }\)

By solving the equation:

\(q1q2 =\frac{F_{c} d^{2} }{k}\)

\(\frac{(4*10^{-23}(0.03m )^{2} }{(9.0*10^{9}N.m^{2}/C^{2}) }\)

= 4 x 10 ⁻³⁶C²

This is the square of the charge on the pieces of puffed rice.

Now, to find the charge on one piece of puffed rice,

take the square root of this number.

q = √4 x 10⁻³⁶ C²

q = 2 x 10⁻¹⁸ C

Therefore,

The charge on each of the pieces is 2 x 10⁻¹⁸ C

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Answer:

D

Explanation:

These all can impact the magnetic properties

Explanation:

(i) The horizontal component of the tension in the right wire points right, and the horizontal component of the tension in the left wire points left.  Since these components are equal and opposite, the resultant horizontal force is 0.

∑Fₓ = 15 N cos 20° − 15 N cos 20°

∑Fₓ = 0 N

(ii) ∑Fᵧ = 15 N sin 20° + 15 N sin 20°

∑Fᵧ = 10.26 N

i) The resultant horizontal component of the tension forces is 0N

ii) The resultant vertical component of the tension forces is 10.26N

iii) The sum of force along the horizontal is zero because the force has the same magnitude and moving in the opposite direction.

i) From the given figure, the horizontal component of the force is given as;

\(F_x = + 15 cos 20^0 + (-15cos20^0)\\F_x = + 15 cos 20^0 -15cos20^0\\F_x =0\)

The sum of force along the horizontal is zero because the force has the same magnitude and moving in the opposite direction.

ii) The vertical component of the force is expressed as

\(F_y = + 15 sin 20^0 + 15sin20^0)\\F_y = 2(15sin20^0)\\F_y=2(5.13)\\F_y=10.26N\)

Hence the resultant vertical component of the tension forces is 10.26N

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Answer:

4.5V

Explanation:

In a arrangement of cells, the cells could be joined end to end(series) or to a common junction (parallel).

When cells are joined in series, the total emf of the cell is the sum of the individual emf of all the cells.

Hence;

Total emf = 1.5V + 1.5V + 1.5 V = 4.5 Volts

Answer:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.

Coefficient of friction, ratio of the frictional force resisting the motion of two surfaces in contact to the normal force pressing the two surfaces together. It is usually symbolized by the Greek letter mu (μ). Mathematically, μ = F/N, where F is the frictional force and N is the normal force.

Answer:

The current would be multiplied by 1/4, meaning it is reduced by 3/4 of itself.

Explanation:

This is because when the resistance increases, the current decreases along with it.

Color perception is determined by wavelengths of light, red, green, and blue make colors for objects that emit light. The color we see for objects not emitting light is based on reflected light. Sunglasses and filters change perceived colors by blocking certain wavelengths of light.

Color perception is a complex phenomenon that involves the interaction between light and objects in our environment. The colors that we see are determined by the wavelengths of photons that are reflected or emitted by objects. When light hits an object, some photons are absorbed while others are reflected, and the reflected photons are what we see as color.

For objects that emit light, such as TVs and computer screens, the colors are created by combining just three primary colors: red, green, and blue. By varying the intensity of these three colors, the screen can create a wide range of hues and shades.

For objects that do not emit light, such as colored paper, the color that we see is determined by the wavelengths of light that are reflected by the object. For example, a red piece of paper appears red because it reflects red light and absorbs other wavelengths.

Filters, such as sunglasses, work by selectively blocking certain wavelengths of light. This changes the colors that we perceive, as some colors are absorbed while others are allowed through.

In summary, color perception is based on the wavelengths of photons reflected or emitted by objects. For objects that emit light, colors are created by combining red, green, and blue.

For objects that do not emit light, the color that we see is determined by the wavelengths of light that are reflected. Filters, such as sunglasses, work by selectively blocking certain wavelengths of light to change the colors that we perceive.

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The width of each slit (D) should be D = d / 4. for the first minima of diffraction to coincide with the fourth maxima of interference. Option B is correct.

In a double-slit interference experiment, the interference pattern is created by the superposition of waves from two slits. The condition for constructive interference at a particular angle is given by the equation:

dsinθ = mλ,

where d is the distance between the centers of the slits, θ is the angle of observation, m is the order of the interference maximum, and λ is the wavelength of the light.

For the first minima of diffraction to coincide with the fourth maxima of interference, we have m = 4.

At the first minima of diffraction, sinθ = λ / D, where D is the width of each slit.

At the fourth maxima of interference, dsinθ = 4λ.

Equating these two expressions, we have:

d * (λ / D) = 4λ.

Simplifying the equation, we get:

D = d / 4.

The width of each slit (D) should be equal to one-fourth (1/4) of the distance between the centers of the slits (d). Option B is correct.

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When a 1000 kg pallet of bricks is being lowered to the ground by a crane at a constant speed, we can calculate the work done by the cable on the bricks as they descend 11 meters.

In this scenario, the force exerted by the cable is equal to the gravitational force acting on the bricks, as they are moving at a constant speed. The gravitational force can be calculated using the formula F = m * g, where F is the force, m is the mass (1000 kg), and g is the acceleration due to gravity (approximately 9.81 m/s²).

F = 1000 kg * 9.81 m/s² = 9810 N

Now that we have the force, we can calculate the work done by the cable using the formula W = F * d * cosθ, where W is the work, F is the force (9810 N), d is the distance (11 m), and θ is the angle between the force and the direction of movement. In this case, the force and movement direction are both vertically downwards, making θ = 0 degrees, and cosθ = 1.

W = 9810 N * 11 m * 1 = 107910 J

Therefore, the work done by the cable on the bricks as they descend 11 meters is 107,910 Joules.

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A light-year is a unit of distance, specifically the distance that light travels in one year.

Light travels at a speed of approximately 299,792 kilometers per second (or about 186,282 miles per second) in a vacuum. Therefore, to determine which planet is 20 light-years away from Earth, we need to identify a planet located at a distance of approximately 20 times this speed of light.

As of my knowledge cutoff in September 2021, no known exoplanets have been directly observed and confirmed to be located exactly 20 light-years away from Earth. However, there are numerous exoplanets that have been discovered within a range of distances from Earth.

Some notable exoplanets discovered within approximately 20 light-years of Earth include:

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Answer:

so, why we have to find here..

By measuring the recession velocities and therefore the distant galaxies and noticing that these parameters are intimately related to time. Option A.

Find the oldest stars, measure the expansion rate of the universe, and extrapolate back to the large Bang. a bit like a detective can trace the origin of a sphere through a hole in the wall.

Current measurements put the world at about 4.54 billion years old and therefore the universe at About 13.8 billion years. Scientists measure the dimensions of the universe in a myriad of different ways. they will measure ripples from the early universe known as baryonic acoustic oscillations that fill the cosmic microwave background. you'll also use a standard candle, like a Type 1A supernova, to live within distance.

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