Which shows zero as significant digits? Check all that apply.




A. 0. 02



B. 7. 560



C. 430



D. 604



E. 70,230

Scientist’s work is supported by this observation. The correct answer is : d. Aristotle

Which scientist’s work is supported by this observation?

Aristotle's work in physics is supported by this observation, as he proposed that heavier objects fall faster than lighter objects. Since both the large and small branches take the same amount of time to fall to the ground, it indicates that the weight of the branches does not affect the time it takes for them to fall. This supports Aristotle's theory that the speed of falling objects is independent of their weight. Aristotle proposed that objects fall at a constant speed regardless of their weight. This is due to the fact that the force of gravity is constant and it accelerates all objects at the same rate.

This is why both the large and small branches take the same amount of time to fall to the ground.

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Answer:

Why can no one eve give a correct answer

the real answer is Galileo

Explanation:

Answer:

Momentum

Explanation:

If we change how fast an object is going and change its mass, then we have changed its momentum.

The momentum of body is the quantity of motion such a body can possess.

It is mathematically expressed as:

   Momentum  = mass x velocity

Therefore, if we vary mass and velocity or either of them, then, the momentum of the object will also change.

Mass and velocity is very crucial to the momentum of a body.

According to the Brewster's law The angle of incidence is θ=tan −1n.

What is Brewster's law?
Brewster's law is a relationship for light waves that states that if a light ray is allowed to fall on the surface of the a transparent medium in a way that refracted ray makes a 90° angle with the reflected ray, the maximum polarisation (vibration in one aircraft only) can be achieved. The law bears Sir David Brewster's name, a Scottish physicist who first suggested it in 1811. The illustration depicts a ray of regular (nonpolarized) light with a particular wavelength striking a transparent medium's reflecting surface (e.g., water or glass).

According to Brewster's law,

the angle of incidence at which the reflected light is totally polarized for reflection from air to glass is governed by the relation

n=tanθ

∴θ=tan −1n

Hence, the angle of incidence is θ=tan −1n.

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B. 4

That's the correct answer

Answer:

Each hailstone has a mass of 7 g and a speed of 4.5 m /s. If the collisions are elastic, what is the average force on the window? ... strike a glass window of an area of 0.954 m2 at an angle of 25◦ to the window surface.

Explanation:

Thats all i hope this helps lol

Irina of mass 110 kg floats in fresh water, the volume is 0.06m³.

The buoyant force is the upward force exerted on any object by the fluid. If the buoyant force is lesser than the object's weight, the object will sink while if buoyant force is greater than the object's weight it will float.

In the question irina of mass 110 kg floats in fresh water that indicates:

weight of irina = buoyant force

mg = Vρg

m =  Vρ

Where, m = mass of irina

V = volume

ρ = density of water

110 = V × 1000

V = \(\frac{110}{1000}\)

V = 0.11m³

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Answer:

decomposition reaction

Explanation:

decomposition reactions occurs when one substance breaks down, or decomposes, into two or more substances

Answer: Sounds are made when objects vibrate. The vibration makes the air around the object vibrate and the air vibrations enter your ear, You hear them as sounds

Explanation:

A cart moving at a constant speed of 25 m/s possesses 438 J of kinetic energy, and the mass of the car is 1.6 kg.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object to accelerate it. We must put in the effort to apply force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.

Definition: When an object is moving at a constant speed—that is, its speed does not change—we say it is moving at a constant speed. steady rate

Given:

KE = 500 J

v = 25 m/s

The formula for Kinetic Energy is given:

KE = ½ mv²

where: KE - Kinetic Energy

m - mass

v - velocity

Substituting the value of KE and v in the formula,

500 J = (½)(m)(25 m/s)²

m = (500 J)(2)/(25 m/s)²

m = 1.6 kg

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Answer:

1. because of the tilted axis of earth the seasons in northern hemisphere are the exact opposite of the southern. because the sunrays reaches the earth an different points and when the earth moves around the sun it changes the hemisphere which is tilted to the sun.

2. the northern hemisphere is in Winter and the southern in summer. because the southern is tilted to the sun and the northern not so less sunrays reaches the northern hemisphere.

I'm sorry my explanation are bad

Answer:

Zero

Explanation:

The resultant force acting on the ball would be zero.

Since only two forces were acting on the tennis ball and these forces negate and cancel each other in magnitude, the resultant effect on the tennis ball would be zero.

Assuming that one of the forces is 5N and acting from the positive side and the other force is also 5N but acting from the negative side.

Resultant = -5 + 5 = 0 N

An example of a solid that sunlines is a billboard.

A billboard simply refers to a very large board which is usually, frequently and most of the time used for displaying advertisements

So therefore, an example of a solid that sunlines is a billboard

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The true statements are:Jupiter's Great Red Spot is in the southern hemisphere.The fastest wind speed recorded in our solar system is on Neptune.

Among the given statements, only two are true. Jupiter's Great Red Spot, a massive storm, is indeed located in the southern hemisphere of the planet. The Great Red Spot is a prominent feature on Jupiter, visible as a giant swirling storm system. On the other hand, the fastest wind speed recorded in our solar system, reaching speeds of up to 2,100 kilometers per hour (1,300 miles per hour), is found on Neptune.

The strong winds on Neptune contribute to its dynamic atmosphere and the formation of features like the Great Dark Spot. The remaining statements about Pluto, Saturn's moon Enceladus, and Uranus are not true according to our current understanding.

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Answer:

155mEq/L Cl-

Explanation:

A Ringer’s solution contains the following concentrations of cations: 146 mEq/L of Na+, 5 mEq/L of K+, and 4 mEq/L of Ca2+.

As Cl- is the only counterion of those cations:

For Na, the molecule is NaCl and the mEq/L of Cl- = mEq of Na+. The Cl- of the first ion is 146mEq/L Cl-

For K+, The molecule is KCl, mEq Cl- = 5mEq/L Cl-

And, for Ca2+, The molecule is CaCl2 but the equivalents of Ca2+ = Equivalents of Cl- = 4mEq/L Cl-

The total concentration of Cl- are:

146 + 5 + 4 =

Answer:

1,800kg

Explanation:

Force = Mass x Acceleration

F = m x a

15840N = m x 8.8

8.8 x m = 15840

m = 15840/8.8

= 1,800kg

Answer:

\(\displaystyle 1800\:kg.\)

Explanation:

\(\displaystyle am = F_{net} \\ \\ \frac{15840}{8,8} = \frac{8,8m}{8,8} \\ \\ \boxed{1800 = m}\)

I am joyous to assist you at any time.

Answer:

1. Motion

2. Empty space

3. Far apart

4. Independently

5. Random or rapid

6. Collision

7. Kinetic energy

8. Atmospheric

9. 273 Kelvin or 0° Celsius

10. 1 atm, 101.3 kPa or 760 mmHg

Explanation:

In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.

Generally, matter exists in three (3) distinct or classical phases and these are;

I. Gas.

II. Solid.

III. Liquid.

Filling the missing words or texts in the question, we have;

The kinetic theory describes the motion of particles in matter and the forces of attraction between them. The theory assumes that the volume occupied by a gas is mostly empty space, that the particles of gas are relatively far apart, move independently of each other, and are in constant random or rapid motion. The collision between particles are perfectly elastic so that the total kinetic energy remains constant. Gas pressure results from the simultaneous collisions of billions of particles with an object. Barometers are used to measure atmospheric pressure. Standard conditions are defined as a temperature of 273 Kelvin or 0° Celsius and a pressure of 1 atm, 101.3 kPa or 760 mmHg.

Answer:

Statement of the given problem,

A ball is thrown vertically upwards at 19.6 m/s. For its complete trip (up and back down to the starting position), what is its average speed?

Let H & T denote the maximum height (in m) of the given ball & the time (in s) required for it to reach there.

Hence from above data we get following kinematic relations,

T = [19.6 m/s - 0 m/s)]/(9.8 m/s^2) [9.8 m/s^2 = gravitational acceleration (assumed)]

or T = 2 (s)

H = (19.6 m/s)*(2 s) - (1/2)*(9.8 m/s^2)*(2 s)^2

or H = 19.6 (m)

Therefore,

assuming vertically upward & downward motions are identical with respect to time & distance covered by the given ball,

the required average speed of the ball during its travel up and back down to the starting position

= (total travel-distance)/(total travel-time)

= 2*(19.6 m)/[2*(2 s)]

= 9.8 m/s [Ans]

There are 3.1x10²⁰ electrons flowing through this device.

Calculation:

\(Q=n_e*q_e=n_e*(1.6*10^{-19}C)\)

\(I=\frac{Q}{T}\)

Then

\(I=\frac{n_e*1.6*10^{-19}}{10s}=5A\)

Finally,

\(n_e=3.125*10^{20}electrons\).

An electrical device is a device that relies functionally on electrical energy to power its core. They contrast with traditional mechanical devices that rely on various energy sources such as fuel and human power. Electronic devices are devices that control the flow of electric current for information processing and system control.

Prominent examples are transistors and diodes. Electronic devices are usually small and can be assembled into packages called integrated circuits. An ID is assigned to a physical hardware device by the operating system.

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The total pressure experienced by the diver at the given depth is 201,880 Pa.

The given parameters:

The total pressure experienced by the diver at the given depth is calculated as follows;

\(P = \rho g h\)

where;

ρ is the density of the liquid (kg/m³)

g is acceleration due to gravity

1.03 g/cm³ = 1,030, kg/m³

P = (1030) x (9.8) x (20)

P = 201,880 N/m²

Thus, the total pressure experienced by the diver at the given depth is 201,880 Pa.

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Answer:

5.15 when the angle of incidence is equal to critical angle the angle of reflection is equal to 90 if the angle of incidence is bigger than the critical anger the reflected ray will not emerge from the medium but will be reflected back into the medium this is called total internet reflection

Explanation:

hope it's helpful

Answer:

8.37757

Explanation:

may i have brainliest

It is true that the force of attraction between two objects is called gravity. Gravity is the force that attracts two objects towards each other, and it is proportional to the mass of the objects and the distance between them.

The strength of the gravitational force depends on the masses of the objects and their separation, and it is described by Newton's law of gravitation.

According to Newton's law of gravitation, the gravitational force between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.

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1. Astronomical observational patterns are used to determine the history of the universe by studying the light emitted or absorbed by celestial objects. Scientists analyze the patterns in the electromagnetic spectrum, such as the distribution of wavelengths, intensity, and spectral lines, to gather information about the composition, temperature, motion, and evolution of celestial bodies.

Astronomical observational refers to the act of observing celestial objects and phenomena in the field of astronomy. It involves the use of telescopes, detectors, and other instruments to collect data and study various aspects of the universe.

2. Mount Wilson and Mount Palomar Observatories were used to observe and collect data about space due to several reasons. Firstly, the locations of these observatories provide advantages for astronomical observations.

3. The NASA Mission Statement is: "To pioneer the future in space exploration, scientific discovery, and aeronautics research." This mission statement reflects NASA's commitment to advancing human knowledge, technological innovation, and exploration beyond Earth's boundaries. NASA aims to push the boundaries of scientific understanding, develop and test new technologies, explore the cosmos, and inspire the next generation of scientists and engineers.

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Answer:0

Explanation:

All stationary objects have no momentum they do not have any motion to have momentum you need mass and motion

a) The time taken is 4.44 s

b) The force that keeps it moving is 15188 N

c) The centripetal force is responsible for the motion in the circular path.

d) The coefficient of the friction is 1.03

The centripetal force is the force that keep the object moving in a circular path. In this case, we need to find the how long does it take the car to do a lap around the track.

a) The time that is taken is the radio of the distance to the speed of the object. Thus the time that is taken =  200 m/45 m/s = 4.44 s

b) The net force that acts on the car as it is negotiating the circular path is given as; mv^2/r = 1500 * (45)^2/200

= 15188 N

c) The centripetal force keeps the car on the circular path

d) The coefficient of static friction is; 15188 N/1500 kg * 9.8 m/s^2

= 1.033

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if the universe is 13.8 billion years old, how can we see 46 billion light years away because space has also been expanding?

When total distance to distant cosmic objects like galaxies is taken into account, their measurement is referred to as cosmological distance. This distance accounts for universe's ongoing expansion. Space itself stretches as a result of the universe's expansion, causing two things' distances to grow even when they are not physically moving apart.

One may observe objects that are currently positioned farther distant than the age of the universe thanks to this stretching of space. For a very long time, light emanating from these far-off objects has been travelling through space. Light has essentially travelled a greater distance than the actual physical distance between us and the object because of the universe's expansion during that time.

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The base ball would have more acceleration than the bowling ball. Option C.

We know that from the Newton second law of motion, force is the product of the mass and the acceleration of an object. We can write that; F = ma

F = force

m= mass

a= acceleration

It is clear from the equation that we have shown above that the accaleration of the object does not only depend on the force but also on mass of the object. We can now write;

a = F/m

The higher the mass the lesser the acceleration of the object as we saw above.

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(a) The least elevation angle at which the kicker can kick the ball to score a field goal is approximately 16.5 degrees.

(b) The greatest elevation angle at which the kicker can kick the ball to score a field goal is approximately 21.0 degrees.

To determine the least and greatest elevation angles at which the football kicker can kick the ball to score a field goal, we can use the equations of motion for projectile motion.

Let's denote:

- Initial speed of the ball (v₀) = 26 m/s

- Distance from the kicker to the goalposts (horizontal range) = 48 m

- Height of the goalposts' horizontal bar (vertical displacement) = 3.44 m

(a) To find the least elevation angle:

For the ball to clear the horizontal bar, the vertical displacement should be greater than or equal to the height of the bar. Therefore, we can set up the equation:

h = v₀² × sin²θ / (2 × g)

Where:

- h is the vertical displacement (3.44 m)

- θ is the elevation angle we want to find

- g is the acceleration due to gravity (approximately 9.8 m/s²)

Rearranging the equation to solve for sin²θ:

sin²θ = (2 × g × h) / v₀²

Substituting the given values:

sin²θ = (2 × 9.8 m/s² × 3.44 m) / (26 m/s)²

sin²θ ≈ 0.079

Taking the square root of both sides:

sinθ ≈ √0.079

θ ≈ arcsin(√0.079)

θ ≈ 16.5 degrees

Therefore, the least elevation angle at which the kicker can kick the ball to score a field goal is approximately 16.5 degrees.

(b) To find the greatest elevation angle:

To determine the greatest elevation angle, we need to find the angle that maximizes the range (horizontal distance) while still clearing the goalposts.

The range of the projectile can be calculated using the formula:

R = v₀² × sin(2θ) / g

Substituting the given values:

48 m = (26 m/s)² × sin(2θ) / (9.8 m/s²)

Rearranging the equation to solve for sin(2θ):

sin(2θ) = (48 m × 9.8 m/s²) / (26 m/s)²

sin(2θ) ≈ 0.662

Taking the inverse sine to find 2θ:

2θ ≈ arcsin(0.662)

θ ≈ 0.5 × arcsin(0.662)

θ ≈ 0.5 × 42.0 degrees

θ ≈ 21.0 degrees

Therefore, the greatest elevation angle at which the kicker can kick the ball to score a field goal is approximately 21.0 degrees.

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Given a binding affinity of 4.73 electron volts, we are interested in learning the highest velocity of electrons that an 80 nanometer photon may eject from a material.

The formula KEe = hf BE, wherein hf is the photon energy and Also be is the energy (or binding energy) of the electron to the specific material, determines the maximal kinetic energy KEe of expelled electrons (photoelectrons). The formula KEe=hv-, where h is the absorption coefficient and v is the workfunction (not binding energy) of a electron to the specific material, yields the maximal kinetic KEe of released electron (photoelectrons). When incoming light with wavelengths of 400 nm & 250 nm strikes a metal surface, the maximal photoelectron ejection velocities are v and 2v, respectively. In terms of the Planck constant (h) and the speed of light (c), the binding energy of the metal is. The photovoltaic formula Ek = hf , wherein Ek is the maximal energy of the expelled electron, was developed by Einstein using the principle of energy conservation.

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