A swimmer reaches 50 meters away from the start in a swimming lane and swims back to the starting point. What is the total distance covered by the swimmer?
A. 0 m
B.10 m
C. 50 m
D. 100 m

The time taken by the cars to meet is 5.4 x 10³ s.

Speed of car A, v₁ = 45 km/h = 12.5 m/s

Speed of car B, v₂ = 55 km/h = 15.27 m/s

Distance between the cars, d = 150 km = 15 x 10⁴m

The expression for the time taken by the cars to meet can be given as,

Time = Distance/Average speed

t = d/(v₁ + v₂)

Applying the values of d, v₁ and v₂.

t = 15 x 10⁴/(12.5 + 15.27)

t = 15 x 10⁴/27.77

t = 5.4 x 10³ s

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Answer:

m_cable = 2,676 kg

Explanation:

For this exercise we must look for the acceleration with the kinematic ce relations

          v² = v₀² + 2 a x

since the block starts from rest, its initial velocity is vo = 0

          a = v² / 2x

          a = 4.2² /(2 2.0)

          a = 4.41 m / s²

now we can use Newton's second law

Note that the mass that the extreme force has to drag is the mass of the block plus the mass of the cable.

          F = (m + m_cable) a

          m_cable  = F / a -m

          m_cable = 100 / 4.41 - 20

          m_cable = 2,676 kg

Answer:

workers must have a legitimate respect for the common good whose advancement they serve.

Explanation:

Answer:

so they don't get fired and they should be over all nice people

Explanation:

Answer:

number 3

Explanation:

3 represents runoff

Runoff is the water collected after rainfall that drains from the surface area of land. It will be tricky to choose 4 which is likely a smaller waterbody draining to a bigger waterbody

hope it helped

Answer:

(a) 2.85 m

(b) 16.5 m

(c) 21.7 m

(d) 22.7 m

Explanation:

Given:

v₀ₓ = 19 cos 71° m/s

v₀ᵧ = 19 sin 71° m/s

aₓ = 0 m/s²

aᵧ = -9.8 m/s²

(a) Find Δy when t = 3.5 s.

Δy = v₀ᵧ t + ½ aᵧ t²

Δy = (19 sin 71° m/s) (3.5 s) + ½ (-9.8 m/s²) (3.5 s)²

Δy = 2.85 m

(b) Find Δy when vᵧ = 0 m/s.

vᵧ² = v₀ᵧ² + 2 aᵧ Δy

(0 m/s)² = (19 sin 71° m/s)² + 2 (-9.8 m/s²) Δy

Δy = 16.5 m

(c) Find Δx when t = 3.5 s.

Δx = v₀ₓ t + ½ aₓ t²

Δx = (19 cos 71° m/s) (3.5 s) + ½ (0 m/s²) (3.5 s)²

Δx = 21.7 m

(d) Find Δx when Δy = 0 m.

First, find t when Δy = 0 m.

Δy = v₀ᵧ t + ½ aᵧ t²

(0 m) = (19 sin 71° m/s) t + ½ (-9.8 m/s²) t²

0 = t (18.0 − 4.9 t)

t = 3.67

Next, find Δx when t = 3.67 s.

Δx = v₀ₓ t + ½ aₓ t²

Δx = (19 cos 71° m/s) (3.67 s) + ½ (0 m/s²) (3.67 s)²

Δx = 22.7 m

Answer:

Advantages: has the best magnetic properties, good price, good strength, and are easy to process into special shapes.

Disadvantages: are not resistant to high temperature and corrosion, and are fragile.

Explanation:

The time it takes the stone to fall from a height of 7.11 m is 1.2 seconds.

Time can be defined as an ongoing and continuous sequence of events that occur in succession, from past through the present, and to the future.

To calculate the time it takes the stone to drop from an height of 7.11 m, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1 and solve for t.

Hence, the time it takes the stone to fall is 1.2 seconds.

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There are 3.37 × \(10^{22}\) gold atoms per cubic centimeter in the silver-gold alloy.

The density of a binary alloy can be calculated using the following equation:

ρ = w1ρ1 + w2ρ2

where,

ρ = density of the alloy

w1 and w2 = weight fractions of the two components (in this case, gold and silver)

ρ1 and ρ2 = densities of the pure components.

We are given that the alloy contains 10% gold and 90% silver by weight, so we can calculate the weight fractions as:

\(w_{Au}\) = 0.10

\(w_{Ag}\) = 0.90

We are also given the densities of pure gold and silver as:

ρ_Au = 19.32 g/\(cm^{3}\)

ρ_Ag = 10.49 g/\(cm^{3}\)

Now we can substitute these values into the density equation to find the density of the alloy:

ρ = \(w_{Au}\)ρ_Au +\(w_{Ag}\)ρ_Ag

ρ = (0.10)(19.32 g/\(cm^{3}\)) + (0.90)(10.49 g/\(cm^{3}\))

ρ = 11.08 g/\(cm^{3}\)

Next, we need to calculate the number of gold atoms per cubic centimeter in the alloy.

To do this, we can use Avogadro's number and the atomic weights of gold and silver:

\(N_A\) = 6.022 × \(10^{23}\) atoms/mol

Aum = 196.97 g/mol

Agm = 107.87 g/mol

The number of gold atoms:

\(n_{Au}\) = (\(w_{Au}\)ρ/ Aum) × \(N_{A}\)

Substituting the values, we get:

\(n_{Au}\) = (0.10 × 11.08 g/\(cm^{3}\)/ 196.97 g/mol) × 6.022 × \(10^{23}\) atoms/mol

\(n_{Au}\) ≈ 3.37 × \(10^{22}\) atoms/\(cm^{3}\)

Therefore, there are approximately 3.37 × \(10^{22}\) gold atoms per cubic centimeter in the silver-gold alloy.

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Answer:

Explanation:

f =ma

F 2500 kg (20m/s-0m/s/15s)

F=2500kg(1.33m/s²)

F =3,325 N

f =ma, F 2500 kg (20m/s-0m/s/15s) and F=2500kg(1.33m/s²), F =3,325 N.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects.

The force is no longer felt by the two objects when the interaction ends. Only when there is interaction do forces actually exist.

Action-at-a-distance forces are those that happen even when the two interacting objects are not physically touching each other but are nevertheless able to push or pull against each other despite their physical separation. Gravitational forces are an example of action-at-a-distance forces.

Therefore, f =ma, F 2500 kg (20m/s-0m/s/15s) and F=2500kg(1.33m/s²), F =3,325 N.

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Answer:

5.3 m

Explanation:

Your friend is 1800 mm tall, and you want them to fill half the frame (79 mm / 2 = 39.5 mm).

The film is 116 mm behind the lens.  Using similar triangles:

x / 1800 = 116 / 39.5

x = 5286

Rounded to two significant figures, your friend should stand 5.3 meters away.

Given the mass of the cell is 1 * 10⁻¹⁴ kg, the number of cells in the 65 kg person is  6.5 * 10¹⁵  cells.

The number of cells in a human is calculated as follows:

The mass of an average cell is ten times the mass of a bacterium.

The mass of a bacterium = 1 * 10⁻¹⁵ kg

mass of an average cell = 10 *  1 * 10⁻¹⁵ kg =  1 * 10⁻¹⁴ kg

Number of cells = mass of person/mass of cell

Number of cells = 65 kg/1 * 10⁻¹⁴ kg

Number of cells = 6.5 * 10¹⁵  cells.

In conclusion, the number of cells is obtained by dividing the mass of the person by the mass of a average cell.

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Note that the complete question is given below:

Assuming the mass of an average cell is ten times the mass of a bacterium (which is 10⁻¹⁵ kg): Calculate the number of cells in a human assuming the mass of the person is 10² kg.

Answer:

er so ue 0.984 kg study your self brhh

Answer:O2 & C6H12O6

Explanation:

C6H12O6 + 6O2-> 6CO2 + 6H2O

O2 and C6H12O6 molecules' chemical connections are disrupted.

         C6H12O6 + 6O2-> 6CO2 + 6H2O

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If a component obeys Ohm’s Law, then decreasing the temperature of a material will decrease the resistance.

According to Ohm's Law, the resistance of a conductor is directly proportional to its temperature, and inversely proportional to its cross-sectional area and the length of the conductor.

However, for most conductors, the change in resistance due to a change in temperature is relatively small, and can be approximated using the temperature coefficient of resistance (TCR) of the material. The TCR is a measure of how much the resistance of a material changes per degree change in temperature.

In general, for metallic conductors, the TCR is positive, which means that the resistance increases as the temperature increases, and decreases as the temperature decreases. Therefore, if the temperature of a material decreases, the resistance of the material will also decrease, assuming that the other factors affecting resistance (such as length and cross-sectional area) remain constant.

Decreasing the temperature of a material that obeys Ohm's law generally decreases the resistance because the charged particles in the material move slower, resulting in less resistance to current.

If a component obeys Ohm’s Law, resistance in most common materials generally increases with temperature. Therefore, decreasing the temperature of a material will normally decrease the resistance. This is because the charged particles in the material move more slowly at lower temperatures, leading to less resistance to current flow.

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The Power is equal to 300 J/s or 300 Watts.

A force that causes a displacement is what the term "quantity work" refers to. The duration of this force's action to produce the displacement has nothing to do with work or power. Sometimes the task is completed quite fast, and other times it is completed fairly slowly. For instance, it takes an unusually long time for a rock climber to raise her body a few meters up the cliff's edge. A trail hiker, on the other hand, could quickly raise her body a few meters if she chooses the simpler route up the mountain. Even though they both perform the same amount of labor, the hiker completes it in a lot less time than the rock climber.

The formula for power is ( P = \(\frac{W}{t}\) ) or ( P = \(\frac{m \times a \times d}{t}\)  )

m ( mass ) = 60 kg

a ( acceleration ) = 10 m/s²

d ( distance ) =  5 m

t ( time ) = 10 s

P ( Power ) = ?

P = \(\frac{m \times a \times d}{t}\)

= \(\frac{60\times 10 \times 5}{10}\)

= \(\frac{3000}{10}\)

= 300 J/s

= 300 Watts

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Answer:

We know that,

Pressure = Force ÷ Area

First let's find the force of the cube.

F = m × g

  = 20 kg  × 10 ms⁻²

  = 200N

Now let us find the Area of the cube.

A = 6 a²

   = 6 × \(\frac{50}{100}\) × \(\frac{50}{100}\)

   = 1.5 m²

Now let us find the pressure.

Pressure = Force ÷ Area

               = 200 N ÷ 1.5 m²

               = 133 . 33 N m⁻² / 133 . 33 Pa

Hope this helps you :-)

Explanation:

We know that

F = ma

Here,

a = g = 10 m/s²

So,

F = mg

=> F = 20 × 10

=> F = 200 N

now,

As 1 m = 100 cm

50 cm = 50/100 = 0.5 m

=> SA of cube = 6a²

=> SA = 6(0.5)²

=> SA = 6 × 0.25

=> SA = 1.5 m²

Now,

P = F/A

=> P = 200/1.5

=> P = 2000/15

=> P = 400/3

=> P = 133.3 Pa

Answer: Start by writing down the problem in your own words using as much detail as possible. Be as specific as possible in your description.

Explanation:

Explanation:

The formula we are going to use is

Pressure = F/A

Elephant:

First, we need to convert weight into newtons.

1kg=9.8 newtons, so 2800kg × newtons = 27440newtons

For 4 feet= 200×4= 800cm^2

Convert the area to meter squared using the following:

1 centimeter squared = 0.0001 meters squared

800cm^2×0.0001= 0.08m^2

Pressure=F/A

Pressure= 27440/0.08

The pressure exerted on the ground by the elephant is 343000 Pascals.

Vulture:

12kg×9.8=117.6newtons

for 2 feet= 2.0×2=4cm^2

4×0.0001=0.0004m^2

117.6/0.0004= 294000 Pascals

To compare the pressure, just do a ratio of the elephant's pressure to vulture's pressure.

343000/294000≈ 1.17

So the pressure is about 1 times bigger.

Keep in mind that the elephant has 4 feet, which help to increase the area which in turn decrease the pressure. 

Elephant's feet are more likely to sink as elephant's feet apply more pressure on the muddy area.

Pressure is defined as the thrust per unit area. Thrust is the perpendicular force applied. Its SI unit is pascals.

So, P = T/A

Here,

Mass of elephant = 2800 kg

Force applied = 2800 × 9.8 ( 1kg = 9.8 N)

= 27440 N

Average feet area of elephant = 200 cm2

Since an elephant has 4 feet,

200 × 4 = 800 cm2 = 0.08 m2

Now, P = F/A

27440/0.08 = 343000 pascals

For the vulture,

Force of the vulture = 12 × 9.8 = 117.6 N

Area = 2.0 × 2 = 4cm2 = 0.0004 m2

Now, P = 117.6 / 0.0004 = 294000 pascals

So, pressure applied by the elephant's feet is more than the pressure applied by the vulture's feet. Therefore, the elephant's feet will sink.

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The force is 3496 N

Acceleration is the rate at which an object's velocity changes over time. Mathematically, acceleration is defined as the change in velocity (delta v) divided by the change in time.

The unit of acceleration in the International System of Units (SI) is meters per second squared (m/s²). This means that if an object's velocity changes by 1 meter per second (m/s) every second, its acceleration is 1 m/s².

We know that;

v^2 = u^2 + 2as

Where u = 0

v^2 = 2as

a = v^2/2s

a = (62)^2/ 2 * 22

a = 87.4 m/s^2

Force = ma

= 40 Kg*  87.4 m/s^2

= 3496 N

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Answer:

A, C, D and E are the true statement about current flowing.

Answer:

ΔE = 7.559 eV ,     λ = 1,645 10⁻⁷ m

Explanation:

For this exercise we can use the Bohr model for ionized atom with only one free electron,

         r_n = n² a₀ / Z

         E_n = -13,606 Z² / n²

Where a₀ is the Bohr radius of the hydrogen atom (a₀ = 0.0529 nm), Z is the atomic number of the atom under study and 13.606 eV is the energy of the ground state of Hydrogen.

In our case the Helium atom has two protons Z = 2

let's calculate the quantum number and the energy of each orbit

r_n = 0.30 nm

          n₁ = √ (r_n Z / a₀)

          n₁ = √ (0.30 2 / 0.0529)

Note that we do not have to reduce the radius since they are all in nanometers

          n₁ = 3.3

since n is an integer we approximate it to

         n₁ = 3

r_n = 0.20 nm

          n₂ = √ (0.2 2 / 0.0529)

          n₂ = 2.7

To approximate this value we must assume that there could be some error in the medicinal radio,

          n₂ = 2

having the quantum numbers of the two radius we can calculate their energy

        E₃ = - 13,606 2²/3²

        E₃ = - 6.047 eV

        E₂ = -13.606 2²/2²

         E₂ = -13.606 eV

the energy of the emitted photon is

          ΔE = E₃ - E₂

          ΔE = -6.047 + 13.606

          ΔE = 7.559 eV

You do not indicate in the exercise if you want the energy or the wavelength of the photon,

to find the wavelength We use the Planck relation

          E = h f

          c = λ f

          E = h c /λ

          λ = h c / E

we must reduce the energy to the SI system

          E = 7.559 ev (1.6 10⁻¹⁹ J / 1eV) = 12.09 10⁻¹⁹ J

          λ = 6.63 10⁻³⁴ 3 10⁸ / 12.09 10⁻¹⁹

          λ = 1,645 10⁻⁷ m

The government derive its power according to the Declaration of Independence is the document that declare the freedom of the people. The document was approved by the Continental Congress on July 4, 1776.

Below are the main messages of the declaration of independence.

(1) God made all men equal and gave them the rights of life, liberty, and the pursuit of happiness.

(2) The main business of government is to protect these rights.

(3) If a government tries to withhold these rights, the people are free to revolt and to set up another government.

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Answer:

p_{f} = 6 m / s

Explanation:

We can solve this exercise using conservation of momentum. For this we define a system formed by the two balls, so that the forces during the collision have been intense and the moment is preserved

Initial instant. Before the crash

        p₀ = m v +0

Final moment. Right after the crash

        \(p_{f}\) = (m + m) v_{f}

how the moment is preserved

        p₀ = p_{f}

       m v = 2 m v_{f}

       v_{f} = v / 2

we calculate

       v_{f} = 12/2

       p_{f} = 6 m / s

Answer:

it spills or sometimes it doesn't

Explanation:

depends on the road and speed

Answer: mSkaro = 4mEarth

Explanation:

Trust me

Answer:

you cant really give any answers because i cant tell u were to drag

Answer:

True

Explanation:

Answer:

a, 22 kg and 22 kg

b, 215.8 N and 440 N

Explanation:

a

The mass of the ball remains constant and unchanged irrespective of where it has been to, need to go or is going. So, basically the mass of the ball on earth is as the same mass of the ball on the said planet, 22 kg

b

The weight of any object factors in the acceleration due to gravity of the said area(or planet).

W = mg, with m being the mass and g being the acceleration due to gravity.

On earth

W = 22 * 9.81 = 215.8 N

On the said planet,

W = 22 * 20 = 440 N

Do therefore, the weight is 215.8 N on earth and 440 N on the planet