a person exerts a horizontal force of 76 n on the end of a door 82 cm wide. part a what is the magnitude of the torque if the force is exerted perpendicular to the door? express your answer using two significant figures.

Most astronomers believe we are living in the "age of exploration" for astronomy due to significant advancements in technology, observational capabilities, and our understanding of the universe.

In the last 60 years, several explorations have taken place, revolutionizing our knowledge of the cosmos. One major exploration has been the launch and utilization of space telescopes. Instruments like the Hubble Space Telescope, launched in 1990, have provided breathtaking images and invaluable data, expanding our understanding of distant galaxies, stellar evolution, and the age of the universe. Additionally, the Kepler Space Telescope, launched in 2009, has discovered thousands of exoplanets, leading to groundbreaking insights into planetary systems and the potential for life beyond Earth. Advancements in ground-based observatories have also contributed to the age of exploration. Large-scale telescopes equipped with advanced detectors and adaptive optics technology have enabled astronomers to observe celestial objects with remarkable clarity and detail. These observatories have played a vital role in studying cosmic phenomena, such as black holes, pulsars, supernovae, and the cosmic microwave background radiation. Moreover, significant discoveries have been made in the field of cosmology. The development of precise measurements, such as the cosmic microwave background radiation and the accelerated expansion of the universe, has deepened our understanding of its origins and evolution. The detection of gravitational waves, first observed in 2015, has opened a new window for studying the universe, providing insights into phenomena like neutron star mergers and black hole dynamics.

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Carriers transport solutes across the plasma membrane by facilitated diffusion or active transport mechanisms.

Facilitated diffusion is a passive process where carrier proteins assist in the movement of solutes across the plasma membrane along their concentration gradient. These carrier proteins have specific binding sites for the solutes and undergo conformational changes to facilitate their transport. This process does not require energy expenditure and is driven by the concentration gradient of the solute.

Active transport, on the other hand, is an energy-dependent process that involves carrier proteins called pumps. These pumps actively move solutes across the plasma membrane against their concentration gradient, from an area of lower concentration to an area of higher concentration. This process requires the expenditure of energy, usually in the form of ATP, to drive the transport.

Both facilitated diffusion and active transport play crucial roles in maintaining the balance of solutes within cells and across the plasma membrane. They allow cells to selectively transport specific solutes, such as ions or nutrients, in a controlled manner, which is essential for various cellular processes and overall cell functioning.

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Answer:

Principle of conservation of linear momentum is state as provided no external force acts on a system of colliding bodies the total linear momentum of the bodies (in a given direction) remains constant

Above sea level, water boils at lower temperature due to the  decreased atmospheric pressure.

Air pressure decreases as altitude increases. In other words, low air pressure indicates a high apparent height.

The pressure of the water pressing down on you increases as you go more beneath the surface of the ocean. The pressure rises by one atmosphere for every 33 feet (10.06 meters) you descend. High pressure poses no problems at all for many marine animals.

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Answer:

hydrochlorine +12÷B to the power of 4 -× y reapeated zminus 2 to the power of 9

Freddy has done 2,450 Joules of work climbing from the first branch to the second. This is calculated using the work-energy principle and considering the gravitational force acting on Freddy.

To find the work done by Freddy, we can use the work-energy principle, which states that the work done on an object is equal to the change in its potential energy. In this case, the change in potential energy is due to the change in height while climbing between the two branches.

The gravitational potential energy is given by the formula:

PE = m * g * h

where PE is the potential energy, m is the mass (in kg), g is the acceleration due to gravity (approximately 9.8 m/s²), and h is the height (in meters).

First, let's find the initial potential energy when Freddy is sitting on the first branch at 10 meters:

PE_initial = 50 kg * 9.8 m/s² * 10 m = 4,900 Joules

Next, let's find the potential energy when Freddy climbs to the second branch at 15 meters:

PE_final = 50 kg * 9.8 m/s² * 15 m = 7,350 Joules

Now, we can find the work done by Freddy by calculating the change in potential energy:

Work = PE_final - PE_initial = 7,350 Joules - 4,900 Joules = 2,450 Joules

So, Freddy has done 2,450 Joules of work climbing from the first branch to the second.

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Answer:

D

Explanation:

as one burns then all stop simple

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Answer:

I think the Answer is B. Longitudinal waves

Answer: 42.41 cm

Explanation:

Answer:

7.07 km

Explanation:

The 5 km N and then 5 km E will form two sides of a right triangle.  Use the Pythagorean Theorem to calculate the hypotenuse, x, which will be the person's displacement.

\(5^{2}\) + \(5^{2}\) = \(x^{2}\)

x = 7.07 km NE

The displacement is closest to 7.07 km. Displacement is the shortest distance between the two points.

Displacement is defined as the shortest distance between the two points. Distance is the horizontal length covered by the body. While displacement is the shortest distance between the two points.

Displacement is a vector quantity .its unit is m.

Two sides of a right triangle will be formed by the 5 km N and then the 5 km E.

AB is the displacement

BC is the displacement in east

CA is the displacement in west

The displacement is found as;

\(\rm H^2 = P^2 +B^2 \\\\ AB^2 = BC^2+CA^2 \\\\ AB=\sqrt{5^2+5^2} \\\\ AB=7.07\ kM\)

Hence the displacement is closest to 7.07 km.

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Electron microscopes provide much greater resolving power than light microscopes because they use electrons instead of light to form an image.

Resolving power refers to the ability of a microscope to distinguish between two closely spaced objects as separate entities. Electron microscopes utilize a beam of electrons instead of a beam of light, which allows for a much smaller wavelength. The wavelength of electrons is significantly shorter than that of visible light, which results in greater resolving power.

According to the wave nature of light, the resolution of a microscope is determined by the wavelength of the radiation used to form the image. The resolving power is inversely proportional to the wavelength of the radiation. As the wavelength decreases, the resolving power increases.

Electrons have a much shorter wavelength compared to visible light due to their smaller mass and higher energy. This shorter wavelength enables electron microscopes to visualize extremely small details and structures with high resolution. It allows scientists to observe objects on a nanometer scale, providing much finer details than what can be achieved with light microscopes.

The use of electrons instead of light in electron microscopes leads to a significantly shorter wavelength, resulting in much greater resolving power. This enhanced resolving power enables electron microscopes to capture fine details and visualize structures on a much smaller scale, making them indispensable tools in various scientific fields such as nanotechnology, materials science, and biology.

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Answer:

Magnitude is 2691.33m 5.32° North of East

Explanation:

The plane is flying directly east so the only component is the x component ie + 135 m/s

The wind acceleration is directly northeast. That means 45° N relative to the x-axis(which is the same as saying 45° E relative to the y-axis)

Therefore there are two components to the acceleration due to the wind

The y or North component of acceleration  is 2.18 x sin45°

The x or East component of acceleration is 2.18 x cos 45°

The displacement is given by the formula

s = ut + (1/2)at² where a is the acceleration, t is the time, u = initial velocity and v the final velocity

Substituting values for t= 18s, u = 0, v = 135 m/s and a = 2.18 cos 45° we get

Horizontal displacement
Sx = 135 x 18 + (1/2) x (2.18cos(45°) x (18²)
= 2,679.72 m

Vertical displacement in the +ve y-axis is
Sy = (1/2) x 2.18sin(45°) x (18²) = 249.72 m/s

Both components are equal since sin45 = cos 45

The magnitude of the resulting vector displacement
\(= $\sqrt{2679.72^2 +249.72^2}\\\\\\= 2691.33$ m\\\\Angle is given bytan\theta = $\dfrac{y-component}{x-component}$\\or $\theta = tan^{-1}(\dfrac{249.72}{2679.72})$\\\\\\= 5.32^\circ$ north of east\)

The resultant displacement direction is at an angle of 5.32 ° North of East or directly NE

The velocity–time graph of the Lunar Landing Powered Descent that has a domain of 10 ≤ t ≤ 25, and a range of -2 ≤ v ≤ -40, between the 24th and the 25th seconds gives;

C) The Lander's velocity decreases away from the reference

A velocity time graph is a graph that shows the variation of the velocity of an object with time.

The information with regards to the lunar landing powered descent graph are;

Coordinate points on the graph;

(10, -2); At time t = 10 seconds, the average velocity, v = 0

(10.5, -40); The velocity relative to the starting point changed and decreased from 0 m/s to -40 m/s

(15, -5); The velocity increased from -40 m/s to -5 m/s

(22, -3); The velocity increases from -5 m/s to -3 m/s

(24, -2); The velocity increases from -3 m/s to -2 m/s

(25, -15); The velocity decreases from -2 m/s to -15 m/s

Therefore, taking the reference point as the point where the velocity is zero, 0, we have that between approximately 24 seconds and 25 seconds, the Lander's velocity decreases away from the reference.

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Accident: Get burned

Prevention: turn off the burner.

Our Sun is indeed unique compared to other stars in our galaxy due to size, mass, age, composition, proximity and luminosity.

Firstly, the Sun is a relatively average star in terms of size, mass, and luminosity. It falls within the spectral class G2V, known as a yellow dwarf star. This puts it in a category that is neither too hot nor too cool, providing a stable and long-lasting environment for the development and sustainability of life on Earth.

Secondly, the Sun's age is significant. It is estimated to be around 4.6 billion years old, which places it in the middle stage of its stellar evolution. This age has allowed for the gradual development and stabilization of planetary systems, including our solar system.

Furthermore, the Sun's composition is unique. It consists primarily of hydrogen (about 74% by mass) and helium (about 24% by mass), with trace amounts of other elements. This composition is vital for the Sun's nuclear fusion processes, which generate its energy and light.

Lastly, the Sun's proximity to us allows for detailed observations and studies, enabling a deeper understanding of stellar physics and providing a basis for comparisons with other stars in our galaxy and beyond.

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Answer:

A. 39.2 m/s

B. 78.4 m

Explanation:

Data obtained from the question include:

Time (t) = 4 s

Acceleration due to gravity (g) = 9.8 m/s²

A. Determination of the brick's velocity.

Time (t) = 4 s

Acceleration due to gravity (g) = 9.8 m/s²

Velocity (v) =?

v = gt

v = 4 × 9.8

v = 39.2 m/s

Thus, the brick's velocity after 4 s is 39.2 m/s

B. Determination of how far the brick fall in 4 s.

Time (t) = 4 s

Acceleration due to gravity (g) = 9.8 m/s²

Height (h) =?

h = ½gt²

h = ½ × 9.8 × 4²

h = 4.9 × 16

h = 78.4 m

Thus, the brick fall 78.4 m during the time.

The velocity after 4 seconds is 40 m/s and the height is 80 m.

From the equations of motion under gravity;

v = u + gt

V = final velocity of the brick

u = initial velocity of the brick

g = acceleration due to gravity = 10 ms-2

t = time taken

Note that, u = 0 m/s because the brick was dropped from a height.

v = 0 + 10(4)

v = 40 m/s

The height is obtained from;

h = ut + 1/2 gt^2

u = 0 m/s because the brick was dropped from a height.

h =  1/2 gt^2

h = 1/2 × 10 × (4)^2

h = 80 m

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Longitudinal waves are those waves which move in the same direction as of the particle of the medium. That means, The Particles of the medium move forward and backward just like the Wave move forward so they propagate in the same direction.

The Sound wave is the example of the longitudinal wave as it propagates in  the same direction as the particle do.

Transverse wave are those waves which propagate in the perpendicular direction as of the particle of the medium. That means, The particle moves up and down but the wave propagate in forward direction. So they dont move in similar direction but perpendicular.

Water wave is the perfect example of the transverse wave as you can see that water particles form crest(Up the midline) and trough(down the midline) i.e. upward and downward movement but the water actually moves forward in direction.

Answer:

h

Explanation:

Coulomb's law, or Coulomb's inverse-square law, is an experimental law[1] of physics that quantifies the amount of force between two stationary, electrically charged particles. The electric force between charged bodies at rest is conventionally called electrostatic force or Coulomb force.[2] The law was first discovered in 1785 by French physicist Charles-Augustin de Coulomb, hence the name. Coulomb's law was essential to the development of the theory of electromagnetism, maybe even its starting point,[1] as it made it possible to discuss the quantity of electric charge in a meaningful way.[3]

The law states that the magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them,[4]

{\displaystyle F=k_{\text{e}}{\frac {q_{1}q_{2}}{r^{2}}}}{\displaystyle F=k_{\text{e}}{\frac {q_{1}q_{2}}{r^{2}}}}

Here, ke is Coulomb's constant (ke ≈ 8.988×109 N⋅m2⋅C−2),[1] q1 and q2 are the signed magnitudes of the charges, and the scalar r is the distance between the charges.

The force is along the straight line joining the two charges. If the charges have the same sign, the electrostatic force between them is repulsive; if they have different signs, the force between them is attractive.

Being an inverse-square law, the law is analogous to Isaac Newton's inverse-square law of universal gravitation, but gravitational forces are always attractive, while electrostatic forces can be attractive or repulsive.[2] Coulomb's law can be used to derive Gauss's law, and vice versa. In the case of a single stationary point charge, the two laws are equivalent, expressing the same physical law in different ways.[5] The law has been tested extensively, and observations have upheld the law on the scale from 10−16 m to 108 m.[5]

Answer:

B

Explanation:

hair can be a safety hazard

Answer:

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Explanation:

How to Make Paper Spinners

Step 1: Materials. All you really need is a normal sheet of paper. ...

Step 2: Fold Paper in Half. ...

Step 3: Tear/Cut Along the Fold. ...

Step 4: Fold the Half Sheets. ...

Step 5: Fold Down the Corners of Each Piece. ...

Step 6: Attach the Two Pieces to Create the Spinner. ...

Step 7: Shape Spinner for Best Spinning Abilities. ...

Step 8: Customize.

In a series circuit, the current flows through each component in a series, like a line of people waiting to pass through a narrow gate. As there is only one path for the current to flow through, the current must flow through each resistor to complete the circuit.

The total current in the circuit is equal to the current through each resistor. Therefore, the current through each resistor is the same, as they all experience the same "traffic" or resistance in the circuit. An analogy can be made with a hosepipe where the water flows through the hose in a series, and the diameter of the hose remains the same throughout the length.

In a parallel circuit, the current has multiple paths to flow through, like a group of people splitting into different lines at a fork in the road. Each resistor is connected to the same voltage source, and the voltage across each resistor is the same. As a result, the current through each resistor is determined by its resistance. The smaller the resistance of the resistor, the more current it will draw. An analogy can be made with a river splitting into several branches, each branch having its own flow rate and volume. Therefore, the total current in a parallel circuit is the sum of the current through each resistor.

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The rate of heat that must be supplied to the engine for it to produce 5 hp of power is 7635 btu/h.

The formula for the efficiency of a completely reversible heat engine:

Efficiency = 1 - (Tc/Th)

where Tc is the temperature of the cold sink and Th is the temperature of the hot source. Since the engine is completely reversible, it operates at the maximum possible efficiency, which means:

Efficiency = 1 - (Temperature_sink / Temperature_source)
Efficiency = 1 - (500/1500) = 2/3

We also know that power (P) is related to the rate of heat transfer (Q) by the formula:

P = Q x efficiency

We can rearrange this formula to solve for Q:

Q = P / efficiency

Plugging in the given values, we get:

Q = (5 hp x 2545 btu/hp) / (2/3) = 7635 btu/h

Therefore, the heat must be supplied to the engine at a rate of approximately 19080.69 BTU/h for it to produce 5 hp of power.

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Answer:

See explanation

Explanation:

Given

Mass = 15.8g

Volume = 2cm³

Required

Identify the substance

Bass on the given information, the substance can't be determined. However, I'll solve for the density.

Then you identify the substance through its density.

Density = Mass/Volume

Density = 15.8g/2cm³

Density = 7.9g/cm³

Answer:

To know what will happen we first need to know if the birth rate is more or if the death rate is more if the birth rate had a sudden increases above the death rate we would likely face population problems on the other hand if the death rate is increased more than the birth rate we would have less population problems and more food and resources but if the birth and death rate were to increase equally there would just be a standstill in the population  

Explanation:

Answer:

(a)A contact force is any force that requires contact to occur. Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter. Pushing a car up a hill or kicking a ball across a room are some of the everyday examples where contact forces are at work.