1. An object is projected upward with a velocity of 125 m/s.
(a) To what height will it rise?
(b) How long will it take to reach that height?
(c) What will be the total time elapsed until it strikes the earth?

If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

To find the mass of ore, the given values are,

The radius of the lead sphere is r = 7.0 cm,

The lead can be extracted with, η = 92.5% = 0.925 efficiency.

Density is the substance's mass per unit of volume.

We know the density of lead as,

⇒ p = 11.4 g/cm³ .

The volume of the lead sphere is,

V = 4/3πr³

   = 4/3π(7)³

V = 1436.7 cm³.

Mass of the lead present in the lead sphere is,

m = p . V

    = 11.4  × 1436.7

    = 16379 g

m = 16.379 kg

From the expression of efficiency, we calculate the mass of the ore,

η = Mass of lead obtained / Mass of the ore to be taken

0.925 = 16.379 kg / Mass of the ore to be taken

Mass of the ore to be taken = 17.707 kg

If the lead can be extracted with 92.5 efficiency, the mass of ore is required to make a lead sphere with a 7.00 cm radius is 17.707 kg.

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The person above me is an idiot

Answer:

The correct answer is 10

Explanation:

10 times the singular magnesium which means: 10 times 1

There are 10 magnesium atoms in 10 MgCl₂ as depicted in the chemical formula.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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True. Various heat-related disorders can be brought on by inadequate hydration combined with exposure to extreme heat and humidity.

One of three disorders brought on by excessive heat, with heat cramps being the least dangerous and heatstroke being the most serious, is heat exhaustion. High temperatures, particularly when there is also a high humidity level, and intensive physical activity are the main causes of heat illness.

According to T8 CCR Section 3395, "Heat Illness" refers to a dangerous medical illness caused by the body's incapacity to handle a specific amount of heat. Examples of this ailment include heat cramps, heat exhaustion, heat syncope, and heat stroke.

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Firstly, we can write the equation for the electric force. It is:

By applying our values we get

Now, if we remind ourselves of Newton's law, we know that

We know the mass, and we know the Force, so we can find out the acceleration, this gives us:

Thus

Our final acceleration is 0.122 m/s^2

Answer:

The average speed of the cyclist is 18 \(\frac{km}{hour}\)

Explanation:

Speed ​​is a magnitude that expresses the relationship between the space traveled by an object, the time used for it and its direction. Because it considers direction, it is a vector quantity.

Then the average speed is the quotient of the space traveled by an object and the time it takes to cover the distance traveled:

\(speed=\frac{distance}{time}\)

In this case:

Replacing:

\(speed=\frac{90 km}{5 hours}\)

Solving:

\(speed=18\frac{ km}{ hour}\)

The average speed of the cyclist is 18 \(\frac{km}{hour}\)

The strength or intensity of the magnetic field at a given place in space is referred to as its magnitude.

It is measured in teslas (T) or gauss (G) units, depending on the measuring technique employed. Because the magnetic field is a vector quantity, it possesses both magnitude and direction.

The size of the magnetic field is governed by several parameters, including the current or magnetic charge that generates the field, the distance from the source of the field, and the field's direction with regard to the measuring device.

Magnetic field magnitude can be determined using mathematical methods that account for these parameters, such as the Biot-Savart law or Ampere's law.

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The frequency of the violet light is\(7.5 x 10^14 Hz (Hertz).\)

The frequency of the wave is determined by dividing the velocity of light by its wavelength.

\(v=f/λWhere:v = velocity of light f = frequency λ = wavelength of the light\)

The speed of light is\(3.00 x 10^8\) meters per second (m/s).

To convert 400 cm into meters, divide 400 by 100. 400 cm = 4 m

Therefore,λ = 4 meters

Plugging these values into the formula, \(v = (3.00 x 10^8 m/s) / (4 m) = 7.5 x 10^14 Hz\)

So, the frequency of the violet light with a wavelength of \(400 cm is 7.5 x 10^14 Hz.\)

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Answer:

Explanation:

The acceleration of an object given it's velocity and time taken can be found by using the formula

\(a = \frac{v}{t} \\ \)

v is the velocity

t is the time

From the question we have

\(a = \frac{160}{4.5} = 35.55555...\)

We have the final answer as

Hope this helps you

Answer:

50 kmph

Explanation:

300 / 6 = 50

Answer:

Work is said to be done when a force applied to an object moves that object. We can calculate work by multiplying the force by the movement of the object.

Answer:

Work is done by a force on an object if (i) a force acts on the object and (ii) the object is displaced from its original position

Explanation:

To accurately determine the contents of the accumulator after the second execution phase (t5), I would need more specific information regarding the context or program being executed. The term "accumulator" typically refers to a register or storage location in a computer system that temporarily holds data during arithmetic or logical operations. The specific value or contents of the accumulator at a given time depend on the instructions executed and the data processed during that phase of the program. Without additional details, it is not possible to provide a specific answer.

Answer:

A crossroads of trade is a place where many trade routes converge, often leading to the exchange of goods and ideas between different cultures. Historically, cities and towns located at crossroads of trade have been important centers of commerce and cultural exchange. For example, the ancient city of Alexandria in Egypt was a crossroads of trade between Europe, Africa, and Asia, and played a key role in the exchange of goods and ideas between these regions. In modern times, cities such as Dubai and Singapore have become important crossroads of trade due to their strategic location and well-developed infrastructure for transportation and logistics.

Gọi là máy quang phổ kế

That's a diffraction grating.

Answer:

1,960,000 Joules

Explanation:

To calculate the kinetic energy of an object, you can use the formula:

Kinetic Energy (KE) = 0.5 * mass * velocity^2

Given that the boulder has a mass of 200 kg, we need to determine the velocity at each given height to calculate its kinetic energy.

When the boulder is 1000 m above the ground:

At this height, the boulder is not in motion, so its velocity is 0 m/s. Therefore, the kinetic energy is:

KE = 0.5 * mass * velocity^2 = 0.5 * 200 kg * (0 m/s)^2 = 0 Joules

The kinetic energy is 0 Joules.

When the boulder has fallen 500 m:

To determine the velocity, we can use the conservation of energy principle. The potential energy lost due to the fall is converted into kinetic energy. The potential energy lost can be calculated using the formula:

Potential Energy (PE) = mass * acceleration due to gravity * height

PE = 200 kg * 9.8 m/s^2 * 500 m = 980,000 Joules

Since the potential energy is converted to kinetic energy, the kinetic energy of the boulder when it has fallen 500 m is equal to the potential energy lost:

KE = 980,000 Joules

The kinetic energy is 980,000 Joules.

Just before the boulder hits the ground:

At this point, we assume that all of the potential energy has been converted into kinetic energy. Therefore, the potential energy just before hitting the ground is equal to the kinetic energy. Using the same formula as above:

PE = mass * acceleration due to gravity * height

PE = 200 kg * 9.8 m/s^2 * 1000 m = 1,960,000 Joules

The kinetic energy just before the boulder hits the ground is 1,960,000 Joules.

Answer:

which statement is true about his walk? he walked 1200m then went back 600m

Explanation:

because he walked 1200m east the 600m west so it adds up to 600

The D. critical path is a series of events and activities with no slack time.

It is a path that defines the longest duration required to complete a project. It is significant in the project management methodology as it helps the project manager establish a timeline for the project while also identifying the activities that are most critical to the project's completion. If an activity on the critical path takes longer than anticipated, the whole project will be delayed, and if an activity is completed earlier than expected, then it might not be worth it to continue the project, and the client might not be willing to pay for it.

The critical path analysis allows managers to identify and control the critical factors that can impact a project's success, enabling them to focus on the most important areas and make informed decisions about the project. So the correct answer is D. critical path, is a series of events and activities with no slack time.

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Answer:

Its not just a mere formula . It tells a hell lot about charges .

q = ne . As you know , q stands for charge and e stands for charge on an electron . As for n , it represents an integer.

This whole q=ne thing represents quantisation of charge. The formula tells us that charge is quantized ( in the form of small packets)

Every body on this small earth has a charge which has to be an integral multiple of ‘e’ . So , we represent charge on a body(q) as

q=ne.

Hence the formula .

I hope you got what I want to say .

Thanks for reading .

When light waves encounter a clear glass surface, some of the light is reflected and some is transmitted through the glass. The amount of light that is reflected depends on the angle of incidence and the refractive index of the glass.

Assuming the glass is in air, the fraction of light that is reflected from the first surface can be calculated using the Fresnel equations. For normal incidence (when the light is shining straight at the glass), the fraction of light reflected is given by:

R = ((n₁ - n₂)/(n₁ + n₂))²

where n₁ is the refractive index of air (approximately 1) and n₂ is the refractive index of the glass. For typical clear glass, n₂ is around 1.5.

Plugging these values into the equation, we find that the fraction of light reflected from the first surface is approximately 4%. Therefore, 96% of the light shining straight at the glass is transmitted through the first surface.

It's important to note that the light that is transmitted through the first surface can be partially reflected again at the second surface of the glass, leading to further losses due to reflection.

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Answer:

Explanation:

\(m =800kg\\v = 15\\\\K.E = \frac{1}{2}mv^2\\ K.E= \frac{1}{2} \times 800\times 15^2\\= 400 \times 225\\= 90000 joules\\= 90 kilojoules\)

The velocity of the arrow after two seconds on the moon is 51.68 m/s.

The given expression for height as a function of time t, H = 55t - 0.83t^(2). We need to find the velocity of the arrow after two seconds. To find velocity, we have to differentiate H with respect to time.

So, we have: dh/dt = 55 - 1.66t.

The velocity of the arrow after two seconds can be found by substituting t = 2 in the above expression. Therefore, we have:

dh/dt = 55 - 1.66

t= 55 - 1.66(2)

= 55 - 3.32

= 51.68.

Therefore, the velocity of the arrow after two seconds is 51.68 m/s.

Explanation: The given expression for height as a function of time t, H = 55t - 0.83t^(2). We need to find the velocity of the arrow after two seconds. To find velocity, we have to differentiate H with respect to time.

So, we have:

dh/dt = 55 - 1.66t.

The velocity of the arrow after two seconds can be found by substituting t = 2 in the above expression. Therefore, we have: dh/dt = 55 - 1.66t

= 55 - 1.66(2)

= 55 - 3.32

= 51.68.  

Hence, the velocity of the arrow after two seconds is 51.68 m/s.

Conclusion: The velocity of the arrow after two seconds on the moon is 51.68 m/s.

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Answer:

Metals conduct heat and reduce the kinetic energy within the components that need to remain cool

The maximum kinetic energy of the photoelectrons when light of wavelength 300.0 nm falls on the same surface is 1.83 eV.

The maximum kinetic energy of the photoelectrons when light of wavelength 300.0 nm falls on the same surface is 1.83 eV.Step-by-step explanation:

Given, The wavelength of light, λ₁ = 400.0 nm.

The maximum kinetic energy of the emitted photoelectrons, K₁ = 1.10 eV. We need to find the maximum kinetic energy of the photoelectrons when light of wavelength 300.0 nm falls on the same surface.

We know that the maximum kinetic energy of the photoelectrons is given byK.E = (hc/λ) - Φwherehc = 4.14 x 10⁻¹⁵ eV s.

Planck's constant = 6.63 x 10⁻³⁴ JsΦ = work function of the metal surface.

The work function of the metal surface is the energy required to remove an electron from the metal surface. It is the minimum energy required to emit an electron from the surface of the metal.

For metals, it lies between 2 eV and 6 eV. We can write K. E₁ = (hc/λ₁) - ΦK.E₂ = (hc/λ₂) - ΦDividing equation (1) by equation (2), we getK.E₁/K.E₂ = λ₂/λ₁.

Substituting the given values, we get

1.10 eV/K.E₂ = 300.0 nm/400.0 nmK.E₂ = (1.10 eV)(400.0 nm)/(300.0 nm)K.E₂ = 1.83 eV

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Answer:

C voltage

Explanation:

Voltage is the change in electric potential so basically current flows from high potential to low potential due to voltage.

Answer:

You dont need BRAINLY there is an app called slader where you scan the textbook barcode and it shows you the answers for the question in the textbook.

Explanation:

At the location marked by the red line, the total internal loading is -4 kN of shear force and 8 kNm of the moment.

The internal loading due to the support at the wall can be determined using the equation for the shear force (V) and the moment (M) at any point along the beam:

V = -wL/2 = -4*6/2 = -12 kN

M = 0 kNm

Next, we will determine the internal loading due to the uniform distributed load. The shear force (V) and the moment (M) at any point along the beam due to the uniform distributed load can be determined using the following equations:

V = wx = 42 = 8 kN

M = (wx)(x/2) = (42)(2/2) = 8 kNm

Finally, we will add the internal loading due to the support at the wall and the uniform distributed load to find the total internal loading at the location marked by the red line:

V_total = V_support + V_load = -12 + 8 = -4 kN

M_total = M_support + M_load = 0 + 8 = 8 kNm

So at the location marked by the red line, the total internal loading is -4 kN of shear force and 8 kNm of moment.

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The complete question is:

A horizontal beam of length L = 6 m is supported by a wall at one end and a uniform distributed load of w = 4 kN/m is applied to the beam along its entire length. The internal loading at the location marked by the red line, which is located at a distance x = 2 m from the left end of the beam, needs to be determined.

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Explanation:

Specific heat of a substance is defined as the amount of heat that is required to raise the temperature of one mole or mass of a substance by 1°C.

The total amount of heat of a substance is the amount of heat required to raise the temperature of the given mass of the substance by 1°C.

Specific heat is an intensive property and does not depend on the amount of matter that is present within a substance.

Total amount of heat is an extensive property of matter and it is predicated on the amount of matter present.