You push a desk with 245 N, but the desk doesn't move due to its friction with the ground. What is the magnitude of the friction force felt by the desk?

Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

They are maintaining their body temperature by cooling down, like dogs do, as they don't have enough sweat glands to keep them cool without panting.

Brown bears maintain body temperature by cooling as a result of panting. So, the correct option is D.

Normal human body-temperature is defined as the typical temperature range found in humans which is commonly referred to as 36.5–37.5 °C. The human body temperature varies. Temperature is known as the degree of hotness or coldness of an area or object.

When we are very hot, the blood vessels of the skin dilate to carry the excess heat to the surface of the skin. Brown bear panting ensures that cool air circulates over the moist surfaces in the mouth which helps maintain body temperature by cooling the body.

Therefore, the correct option is D.

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The lever's output force is 0.417 N when the input force is 10 N, and its mechanical advantage is 0.0417.

The mechanical advantage (MA) of a lever is the ratio of the output force to the input force.

We can use the formula:

MA = output force (F output) / input force (F input)

Given that the input arm of the lever is 6 m and the output arm is 0.25 m, we can calculate the mechanical advantage as follows:

MA = output arm length (R) / input arm length (L)

MA = R / L

MA = 0.25 m / 6 m

MA = 0.0417

Now, we can use the mechanical advantage formula to calculate the output force:

MA = F output / F input

0.0417 = F output / 10 N

F output = 0.0417 x 10 N

F output = 0.417 N

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Answer:

this is just and example of how to solve it

Explanation:

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Electrons that are located in the outermost orbit in the Bohr model of a boron atom will be 3.

A nucleus with six neutrons and five protons makes up the Bohr model of boron. The K-shell and L-shell electron shells around the nucleus The valence electrons, which make up three of the electrons in the outermost shell of the Bohr diagram, are also present. The orbits of the electrons around the small nucleus are described by the Bohr model of boron.

It utilizes a number of different electron shells, including K, L, M, and N. The number of electrons that each shell can hold varies, with the shell closest to the nucleus having the least energy. The energy levels increase as the shell recedes more. According to the Bohr model, the electrons in an atom may be seen to orbit the nucleus in a variety of orbits with differing energies.

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Answer:

c

Explanation:

Answer:

c

Explanation:

the DNA replication happens in the s phase of interphase

Answer:

Key Takeaways: Metallic Character​​ These properties include metallic luster, formation of cations, high electrical and thermal conductivity, and ...

Explanation:

The atoms with the strongest metallic properties on the periodic table are found in upper left corner of periodic table. The correct option is A.

The upper left corner of the periodic table is typically where one can find the atoms with the strongest metallic properties. Alkali metals and alkaline earth metals which are renowned for their high electrical conductivity, luster and malleability are found in this region. These elements are easy to lose and easily form positive ions because they have few valence electrons in their outermost energy levels.

Due to growing atomic size and declining electronegativity, metallic properties tend to become more noticeable as you move down and to the left in this region. On the other hand nonmetals and metalloids with stronger nonmetallic properties such as high electronegativity and poor electrical conductivity make up the lower right region.

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Answer: A standard 9V battery has about 400-600 mAh capacity. In the most basic terms, these batteries can supply about 500 milliamps for one hour before being "dead". With electricity, we measure the amount of charge flowing through the circuit over a period of time. Current is measured in Amperes (usually just referred to as "Amps"). An ampere is defined as 6.241*10^18 electrons (1 Coulomb) per second passing through a point in a circuit. In a series circuit, amperage, or amplitude, of the current remains constant and can be calculated using Ohm's law V = I/R while the voltage drops across each resistor that can be summed up to get the total resistance.

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The net force acting on the car is 65 N to the left

The net force acting on an object is simply defined as the resultant force acting on the object.

From the question given, we obtained the following data:

The net force acting on the car can be obtained as follow:

Fₙ = Fₗ – Fᵣ

Fₙ = 315 – 250

Therefore, the net force acting on the car is 65 N to the left

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Since there is no friction, the net force on the car in the x - direction will be 65 Newtons

Given that Dave and Alex push on opposite ends of a car that has a mass of 875 kg.

Dave pushes the car to the right with a force of 250 N, which is positive direction and Alex pushes to the left with a force of 315 N which is negative direction. Since there is no friction, only the horizontal forces will be considered.

To calculate the net force on the car in the x-direction, we will find the difference between the two forces because of their directions are opposite to each other.

Net force = 315 - 250

Net force = 65 Newtons

Therefore, the net force on the car in the x - direction will be 65 Newtons

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This question can be solved using the concept of friction energy.

The thermal energy change is b "258.4 J".

The change in thermal energy will be equal to the friction energy produced during the motion of the box.

\(Change\ In\ Thermal\ Energy = E = Friction\ Energy\\\\E = \mu fd\)

where,

μ = coefficient of kinetic friction = 0.4

f = force applied = 38 N

d = distance traveled by the box = 17 m

Therefore,

\(E = (0.4)(38\ N)(17\ m)\)

E = 258.4 J

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Answer:

36000

Explanation:

1/2mv²=0.5×500×12²=36000j

El flujo magnético a través de una bobina con 460 vueltas de superficie de 2 m² cuyo eje forma un ángulo de 60 ° con un campo magnético uniforme de 2 es 779.42 Weber

La fórmula para calcular el flujo magnético a través de una bobina se expresa como:

\(\phi = NABsin\theta\) dónde:

Dados los siguientes parámetros

N = 450 turns

A = 2 m²

B = 2

\(\theta\) = 60degrees

Sustituya los parámetros dados en la fórmula como se muestra:

\(\phi=450 \times 2\times 2sin60^0\\\phi = 900sin60^0\\\phi = 900(0.8660)\\\phi=779.42Weber\)

El flujo magnético a través de una bobina con 460 vueltas de superficie de 2 m² cuyo eje forma un ángulo de 60 ° con un campo magnético uniforme de 2 es 779.42 Weber

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If electrical hand tools are equipped with a three prong power cord with one wire going to ground, then they are designed to ensure safety while using them. The ground wire provides a safe path for any stray electrical currents that may occur during usage.

This can happen due to various reasons such as a short circuit or an equipment malfunction. If such a situation arises, the current will flow through the ground wire and directly into the ground, instead of causing harm to the user. Additionally, the prong power cord ensures that the tool is properly grounded and reduces the risk of electric shock. The three prongs include a hot wire, a neutral wire, and a grounding wire, which together form a complete circuit. The hot wire carries electricity from the source, the neutral wire returns the current to the source, and the grounding wire provides a safe route for any excess current to flow through.

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The electric field will never equal zero between two oppositely charged particles because the electric field from each charge points is in opposite direction in between the charges.

An electric field in physics is a region of space around a charged particle, or between two voltages, which exerts a force on charged objects in its vicinity.

For opposite charges, the point of zero electric fields will lie outside the system along the line joining the two charges.

Therefore, the electric field will never equal zero between two oppositely charged particles because the electric field from each charge points is in opposite direction in between the charges.

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Time taken to slow down the speed will be 5 seconds.

Average acceleration of the bus, a = 1.8 m/s²

Initial velocity of the bus, u = 9.0 m/s

Final velocity of the bus, v = 0 m/s

According to the First Equation of the motion which relates the acceleration, velocity and time we can say that

v = u + at

v - u = at

0 - 9 = (-1.8) * t

9 = 1.8 * t

t = \(\frac{9}{1.8}\)

t = 5 s

Therefore 5 seconds will be required by the bus to slow down its speed from 9.0 m/s to 0.0 m/s

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Answer:

3.83 m/s

Explanation:

Given that,

Distance covered by Jan, d = 4 miles

1 mile = 1609.34 m

4 miles = 6437.38 m

Time, t = 28 minutes = 1680 s

Jan's average speed,

v = d/t

\(v=\dfrac{6437.38\ \text{m}}{1680\ \text{s}}\\\\v=3.83\ \text{m/s}\)

Hence, the average velocity of Jan is 3.83 m/s.

Answer:

2160 km/h

Explanation:

720 times 3 gives you the answer

Answer:

  357.5 miles

Explanation:

  distance = speed × time

  distance = (55 mi/h) × 6.5 h = 357.5 mi

The train will travel 357.5 miles in 6.5 hours.

(a) The wavelength of light passing through the water-filled wedge decreases.

(b) The distance between the dark bands, or fringe spacing, also decreases, leading to the dark bands becoming closer together.

If the air wedge is filled with water, the following effects occur regarding the wavelength and the distance between dark bands:

Wavelength:

The wavelength of light in water is shorter than the wavelength of light in air.

Therefore, when the air wedge is filled with water, the wavelength of light passing through the water-filled wedge decreases.

Distance between Dark Bands:

The distance between dark bands, also known as the fringe spacing, depends on the wavelength of light and the angle of incidence.

When the wavelength of light passing through the water-filled wedge decreases, the distance between the dark bands also decreases.

This means that the dark bands become closer together compared to when the air wedge was filled with air.

In summary, when the air wedge is filled with water:

The wavelength of light passing through the water-filled wedge decreases.

The distance between the dark bands, or fringe spacing, also decreases, leading to the dark bands becoming closer together.

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When the net force exerted on each car is identical. after 10 seconds, the amount of momentum is same for all cars.

The change in momentum is equal to the product of impact force applied while colliding and time for that impact.

F. t = m (Vf -Vi)

where, Vf is the final velocity and Vi is the initial velocity.

For car X, Fx x t = Mx Vx

For car Y, Fy x t = My Vy

For car Z, Fz x t = Mz Vz

The force applied is same for all and the the time is also same equal to 10 seconds. The impulse is same for all the cars.

Thus, the three cars have same momentum.

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Answer:

it is a constant value that does not depend on the observer

Explanation:

Answer: the answer is b

Explanation:

The stereo's current is roughly 2.15 A.

The resistance of the wire that makes up the toaster's heating element is roughly 8.70.

Ohm's law can be used to determine the current in the stereo:

I = V / R

where V is the potential difference, I is the current, and R is the resistance.

By entering the specified values, we obtain:

I = 140 V / 65 Ω ≈ 2.15 A

As a result, the stereo's current is roughly 2.15 A.

The following is the power equation in terms of voltage and resistance:

P = V² / R

P stands for power, V for voltage, and R for resistance.

By entering the specified values, we obtain:

1150 W = (100 V)² / R

When we rewrite the equation, we obtain:

R = (100 V)² / 1150 W ≈ 8.70 Ω

As a result, the resistance of the wire that makes up the toaster's heating element is roughly 8.70.

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The time required for a sample of radioactive tritium to lose 76.0% of its activity is 24.6 years.

To calculate the time required for a sample of radioactive tritium to lose 76.0% of its activity, we can use the half-life formula. Tritium has a half-life of 12.3 years, which means that in 12.3 years, half of the initial amount of tritium will decay.

So, if we want to find out how long it takes for 76.0% of the tritium to decay, we can use the following formula:

time = (ln 2/ln(1/2)) x half-life x (ln(initial activity/final activity)).

Plugging in the values, we get time = (ln 2/ln(1/2)) x 12.3 x (ln(1/final activity)).

Since we want 76.0% of the activity to decay, we can set final activity = 0.24 (1-0.76), which gives us a time of approximately 24.6 years.

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When a projectile is launched at an angle of 30 degrees above the horizontal, the tallest barrier it may clear is 14 meters. The correct option is (b) 33.3m/s.

we can use the kinematic equations of motion for projectile motion. The key is to recognize that the projectile will reach its maximum height when it is at the top of its trajectory, at which point its vertical velocity is zero.

First, we can use the vertical motion equation to find the time it takes for the projectile to reach its maximum height:

vy = v.sin θ - gt

0 = v sin θ - gt

t = v sin θ / g

Next, we can use the horizontal motion equation to find the horizontal distance traveled by the projectile in this time:

x = v.cos θ.t

Now, we want to find the launch speed v that will result in the maximum height of 14 m. To do this, we can substitute the expressions we just derived for t and x into the vertical motion equation for the maximum height:

h = (v sin θ)² / (2g)

Solving v:-

v = √(2gh) / sin θ

Putting values:-

v = √(2 × 9.81 m/s² × 14 m) / sin 30.0°

v ≈ 33.3 m/s

Therefore, the projectile's launch speed is approx. 33.3 m/s, which is answer choice (b).

Note that answer choices (a), (c), and (d) are all close to the correct answer, but not quite correct. This illustrates the importance of being careful with units and significant figures when performing calculations.

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The probable origin of the dark colored features in the surface of mars for about 20 kilometers across are dunes shaped by the wind.

Explanation:

Dunes are familiar features on Earth and they also occur on Mars, Venus, and Saturn's moon, Titan. What all these bodies have in common is an atmosphere, plus substantial amounts of loose sand-size particles. Of all the extraterrestrial dunes scientists know about, those on Mars are the most closely studied.

A dune is a heap of sand piled up and shaped by the wind. (Underwater dunes exist on Earth, but we can ignore these in regard to today's Mars.) The word "dune" implies a substantial size — at least several meters (yards) high. But small ripples of sand only a few centimeters (inches) high are made in the same way from the same materials. The difference lies mainly in the supply of particles and how much time the wind has had to work on them.

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The universe's fabric is the fundamental ingredient of the cosmos.

The universe can be considered as a gigantic piece of cloth. In terms of the distribution of matter throughout the Earth, our solar system, and beyond, it can be imagined that the fabric of the universe is similar to the fabric of a spider web or a fine mesh.

However, the fabric of the universe does not behave like an ordinary fabric, since it expands and stretches, and it is also warped by gravitational forces that originate from its mass.In the cosmic web, galaxies are distributed as filaments, walls, and clusters. The distribution of matter is not uniform throughout the universe, but instead forms clusters of galaxies separated by vast voids that are devoid of matter.

Therefore, the fabric of the universe is more like a cosmic web of matter, with galaxies and other structures being distributed throughout the filaments and walls of the web. However, the universe's fabric is not a simple web, since its geometry is distorted by the presence of massive objects like galaxies and clusters of galaxies.The universe's fabric is the fundamental ingredient of the cosmos.

It is the structure that holds all matter together, and it is the medium through which gravitational waves propagate. The fabric of the universe is not just a passive backdrop against which the universe plays out its drama, but it is an active participant in the cosmic dance, shaping the structure of the cosmos and its evolution over time.

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The given assertion 'In a series circuit, the current is constant throughout the electric circuit' is correct but the reason 'All electric devices need equal currents to operate properly' is incorrect.

A circuit is said to be connected in series when the same current flows through all the components in the circuit. The current in these circuits only travels along one route.

A higher total voltage is produced by series-connected cells than by single cells. Voltage increases if the number of cells increases. Series circuits do not overheat easily.

All the electrical devices do not require equal amount of current for their functioning. For example, an electric heater and an electric fan do not require the same amount of current.

In a series combination, if one component fails, all other components stop working.

Series connection is not suitable for domestic circuits.

Therefore, while the assertion is true, the reason is false.

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Answer:

3.41 × 10^-6

It is because 341 has to be a decimal and the zeros you see there...always count them if the zero has the decimal after it it will be a negative. Why 10 to the power of Negative 6? Count the 6 zeros

Given data:

* The force applied on the ball is F = 900 N.

* The time of contact between Bob and the ball is t_1 = 0.3 s.

* The time of contact between Jill and the ball is t_2 = 0.6 s.

Solution:

The impulse applied by the bob is,

The impulse applied by Jill is,

Thus, the impulse applied by Jill is more than the impulse applied by Bob.

Hence, 4th option is the correct answer.

Answer:

The influx of Ca2+ triggers the release of neurotransmitters stored in synaptic vesicles (B) by exocytosis.

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