A group of particles of total mass 37 kg has a total kinetic energy of 352 J. The kinetic energy relative to the center of mass is 88 J. What is the speed of the center of mass

Answer:

1.....

2.....

Explanation:

1. For the elements in column 1,2 and 13-18 the atoms in the same column have the same amount of outermost electrons, called valence electrons. Atoms in column 1 (H, Li and Na for example) have 1 valence electron.

2. Electron affinity increases from left to right across the periodic table. This is caused by the decrease in atomic radius. As we already explained, moving from left to right across a period, atoms become smaller and smaller as the atomic number increases.

Answer: 8.75 km/hr

Explanation:

Concept to know

Average speed: total distance/total time

-------------------------------------------------------

 total distance/total time

=(12.2+19.3)/(1.4+2.2) ⇔ add the numbers of two time running together

=31.5/3.6 ⇔ simplify

=8.75 km/hr

Hope this helps!! :)

Please let me know if you have any question

Answer: b

Explanation:

Laura will increase the force she needs. When Laura puts her file cabinet on a small cart with wheels, the cart will experience less friction compared to the file cabinet directly resting on the ground. The correct answer is option D.

The presence of wheels reduces the contact area between the cart and the ground, leading to lower frictional forces. As a result, it becomes easier for the cart to move. However, the file cabinet still possesses its original mass, so to accelerate the cart (and the cabinet) to a certain speed or maintain a constant velocity, Laura will need to exert a greater force on the cart due to the reduction in friction. Therefore, the correct answer is D - Laura will increase the force she needs.

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Answer:

please let me know when you find it

Explanation:

i have the same question and cant find it

Answer:

It’s 5m/s^2

Explanation:

The average force required to stop a 900 kg car in 7.0 s if the car is traveling at 90 km/h is -3213 N.

First, we need to convert the speed from km/h to m/s,

90 km/h = 25 m/s (approx)

We can use the equation,

a = (v_f - v_i) / t

where a is the acceleration, v_f is the final velocity (which is zero since the car comes to a stop), v_i is the initial velocity (which is 25 m/s), and t is the time it takes to come to a stop (which is 7.0 s).

Plugging in the values,

a = (0 - 25 m/s) / 7.0 s = -3.57 m/s^2

The negative sign indicates that the acceleration is in the opposite direction to the car's initial velocity.

Now, we can use Newton's second law of motion, which states that force is equal to mass times acceleration,

F = ma

where F is the force required to stop the car, m is the mass of the car (which is 900 kg), and a is the acceleration we calculated earlier.

Plugging in the values,

F = 900 kg x (-3.57 m/s^2) = -3213 N

The negative sign indicates that the force is in the opposite direction to the car's motion.

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One advantage of transferring energy by electromagnetic waves is that they can propagate through a vacuum or empty space. The ability of electromagnetic waves to propagate through a vacuum or empty space enables wireless communication, harnessing solar energy, astronomical observations, and non-invasive medical imaging.

The ability to transfer energy through a vacuum has several important implications and advantages:

1) Wireless communication: The absence of the need for a physical medium allows for convenient and versatile communication methods.

2) Solar energy: Such as generating electricity through solar panels or utilizing solar thermal energy for heating and power generation.

3) Astronomical observations: Electromagnetic waves allow astronomers to study distant objects in the universe.

4) Medical imaging: These waves can penetrate tissues and allow for non-invasive diagnostic imaging techniques, providing valuable information about the internal structures of the human body.

The ability of electromagnetic waves to propagate through a vacuum or empty space enables wireless communication, harnessing solar energy, astronomical observations, and non-invasive medical imaging. This versatility and convenience make electromagnetic wave-based energy transfer advantageous in various fields of technology and scientific exploration.

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One advantage of transferring energy by electromagnetic waves is that they can travel over long distances without significant loss of energy.

Electromagnetic waves are a form of energy transfer that does not require a medium. They can travel through a vacuum, such as outer space, as well as through air, water, and other substances. One advantage of transferring energy by electromagnetic waves is that they can travel over long distances without significant loss of energy. This makes them ideal for long-distance communication, such as radio and television broadcasting, satellite communication, and wireless internet.

Unlike other forms of energy transfer, such as conduction or convection, electromagnetic waves do not require a physical medium to propagate. This means that they can travel through empty space, which is why we can receive signals from distant stars and galaxies. The ability to travel through a vacuum also makes electromagnetic waves suitable for communication in space missions and satellite-based technologies.

Another advantage of electromagnetic waves is their high speed of propagation. Electromagnetic waves travel at the speed of light, which is approximately 299,792,458 meters per second in a vacuum. This high speed allows for fast transmission of information, making electromagnetic waves essential for modern communication systems.

Furthermore, electromagnetic waves can be easily focused and directed. This property allows for efficient energy transfer in specific directions. For example, satellite dishes are designed to receive and transmit electromagnetic waves in a specific direction, ensuring reliable communication between satellites and ground stations.

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The actual distance beneath the surface of the plastic cube where the beetle appears to be embedded is 1.80 cm.

When an object is observed through a transparent medium, such as the polystyrene plastic cube in this case, it appears to be at a different position than its actual location due to the phenomenon of refraction. The apparent position is determined by tracing the path of light rays as they pass through the medium. In this scenario, the beetle appears to be located 1.80 cm within the plastic cube. Therefore, the actual distance beneath the surface of the plastic, where the beetle is positioned, is indeed 1.80 cm.

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Answer:The mass number of this carbon atom is six.

Explanation:

Thats the answer on plato

Answer:

1.2×10¹² kg

Explanation:

from

\(f = \frac{gm1m2 }{r {}^{2} } \)

\(m2 = \frac{fr {}^{2} }{gm1} \)

\(m2 = \frac{1.14 \times (75000 { )}^{2} }{6.67 \times {10}^{ - 11} \times 8 \times {10}^{7} } \)

HENCE M2= 1.2×10¹²kg

Hello!!

For this, use the formula:

\(\boxed{I=V/R}\)

\(\textbf{Being:}\)

\(\sqrt{}\) \(I = Current = ?\)

\(\sqrt{}\) \(V = Voltage = 160 \ V\)

\(\sqrt{}\) \(R = Resistance = 10\ \varOmega\)

\(\textbf{If we replace and resolve it}\)

\(I = 160\ V / 10\ \varOmega\)

\(I = 16\ A\)

\(\text{The current of that circuit is \textbf{16 Amperes}}\)

The expression for the object's speed at the bottom of the slope is:

v = sqrt(2gh - 2gLsinθ/mu_k)

To solve this problem, we can use the conservation of energy principle, which states that the total energy of a system remains constant as long as there are no external forces acting on it.

At the top of the slope, the object has only potential energy, given by:

Ep = mgh

where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the slope.

As the object slides down the slope, it loses potential energy and gains kinetic energy. The work done by the force of gravity is equal to the change in potential energy, so we have:

mgLsinθ = mgh - (1/2)mv^2

where θ is the angle of the slope, and v is the speed of the object at the bottom of the slope. The left-hand side of this equation represents the work done by the force of gravity as the object slides down the slope, while the right-hand side represents the loss of potential energy and the gain of kinetic energy.

Solving for v, we get:

v = sqrt(2gh - 2gLsinθ/mu_k)

where mu_k is the coefficient of kinetic friction between the object and the surface.

Therefore, the expression for the object's speed at the bottom of the slope is:

v = sqrt(2gh - 2gLsinθ/mu_k)

in terms of the variables m, mu_k, L, h, and appropriate constants.

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The given question is incomplete, the complete question is:

An object of mass m is at rest at the top of a smooth slope of height h and length L. The coefficient of kinetic friction between the object and the surface, mu k, is small enough that the object will slide down the slope if given a very small push to get it started. Part A Find an expression for the object's speed at the bottom of the slope. Express your answer in terms of the variables m, mu k, L, h, and appropriate constants.

The amount of heat that must be carried away by the cooling system is -3391 Joules. The negative sign indicates that heat is released by the engine during this process.

Thermodynamics is a branch of physics which deals with the energy and work of a system. It was born in the 19th century as scientists were first discovering how to build and operate steam engines. Thermodynamics deals only with the large-scale response of a system which we can observe and measure in experiments.

To calculate q, the amount of heat that must be carried away by the cooling system, we can use the first law of thermodynamics:

ΔU = q + W

Where ΔU is the change in internal energy, q is the heat, and W is the work.

Given:

ΔU = -2825 J (change in internal energy)

W = 516 J (work done)

Rearranging the equation, we can solve for q:

q = ΔU - W

q = -2825 J - 516 J

q = -3391 J

Therefore, the amount of heat that must be carried away by the cooling system is -3391 Joules. The negative sign indicates that heat is released by the engine during this process.

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The required work to hold the crate above the ground is 150 joule.

We need to know about the work done to solve this problem. The work done by an object depends on the force applied and the distance. The work is proportional to force and displacement. It can be written as

W = F . s

where W is work done, F is the force and s is displacement

From the question above, the given parameters are

F = 100 N

s = 1.5

Thus, the required work to hold the crate above the ground can be calculated

W = F . s

W = 100 . 1.5

W = 150 joule

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Answer:

B is right at first I thought I was wrong

Explanation:

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This tendency to resist changes in a state of motion is inertia.

Answer:

I don't think so

Explanation:

Answer:

10

Explanation:

This indicates that about \(3.13 x 10^{10}\) electrons have been extracted from the glass rod.

(a) Electrons have been removed from the glass rod. This is because when the rod is rubbed, electrons are transferred from the glass to the material it is rubbed against. Since electrons are negatively charged, the glass rod becomes positively charged as a result of losing electrons.

(b) The number of electrons removed can be calculated using the formula Q = ne, where Q is the charge on the rod, n is the number of electrons transferred, and e is the charge of an electron. Therefore, we can rearrange the formula to find n = Q/e. Plugging in the values for Q \((+5.0 nC)\) and e \((-1.6 x 10^-19 C)\), we get:

\(n = (+5.0 x 10^-{9 C}) / (-1.6 x 10^{-19 C}) ≈ -3.13 x 10^{10\) electrons

This means that approximately \(3.13 x 10^{10}\) electrons have been removed from the glass rod.

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Answer:

8km per hour

Explanation:

10 / 1.25 = 8km per hour

So, the speed of the runner is 8km per hour

The required number of grams of Kr gas needed to inflate the baggie is 2.66 grams.

The given information are: Volume of baggie,

V = 829 mL Pressure of gas,

P = 0.900 atm Temperature of gas,

T = 287 K

We need to find the number of grams of Kr gas required to inflate the baggie.

To find the required mass, we will use the Ideal Gas Law which is given by

PV = nRT

Where, n = number of moles of gas

R = Gas constant = 0.0821 L atm/(mol K)From this equation, we can find the number of moles of the gas.

n = (PV)/(RT)On substituting the given values,

n = ((0.900 atm) × (0.829 L)) / ((0.0821 L atm/(mol K)) × (287 K))

= 0.0317 mol

Now, we can calculate the mass of gas required using the formula:

mass = number of moles × molar mass For Kr gas,

molar mass = 83.798 g/mol

Therefore, the mass of Kr gas required = 0.0317 mol × 83.798 g/mol

= 2.66 g

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Answer:

Drums, harps, recorders, and bagpipes.

Explanation:

The answer to the digits rounded to one significant figure is 100.

Significant figures are the most important figures in a number of digits.

The closer a digit is to the beginning of a number, the more important  or significant  it is.

But, the rule for rounding up a set of numbers to the first significant or to one significant figure is that:

From the numbers 98.907, 9 is the most significant digit followed by 8.

8 is greater than 5 so we should round up by adding one to 9 making the number 100.

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Answer:

A magnetic field surrounds any electric charge in motion. ... The distance between the lines indicates relative strength of the magnetic field. The closer the lines are, the stronger the magnetic field is. Iron filings and a compass may be used to trace the shape, strength, and direction of magnetic field lines.

Explanation:

Answer:

first change their units

15km = 15000m

2hrs = 7200secs

now,

speed = distance/timetaken

= 15000/7200

= 2.08 m/s

The name of the theory that states our Solar System formed through the gravitational contraction of a gas cloud is the Nebular Hypothesis. This theory explains that our Solar System originated from a rotating cloud of gas and dust, which contracted due to gravitational forces, eventually forming the Sun and the planets.

According to this hypothesis, about 4.6 billion years ago, a molecular cloud composed mostly of hydrogen and helium, along with trace amounts of other elements, began to collapse under its own gravity. As the cloud contracted, it started to spin faster and flatten into a rotating disk shape.

The central region of the collapsing cloud became denser and hotter, eventually forming the protosun or the pre-Sun. Meanwhile, the material in the surrounding disk began to clump together due to gravity, leading to the formation of protoplanetary disks or accretion disks. Within these disks, dust and gas particles collided and gradually formed planetesimals, which further accumulated to become planets, moons, asteroids, and comets.

The nebular hypothesis provides a comprehensive explanation for the origin and formation of our Solar System, and it is widely accepted by the scientific community.

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Mass can be thought of as the amount of matter in a given volume. No matter where one is (whether in space on Earth or on the moon) mass will always be the same.

Weight, similar to mass but distinctly different, can be thought of as the force that an object exerts on a planet. The weight of an object is based on two major factors, the mass of the object, and the gravitational force of the object that the given object is on. Weight changes depending upon where one is, if an object will weigh more on Earth than it will on the moon or in outer space.

Explanation:

Mass

It is a scalar quantity

It does not change depending on the surrounding

It is use to measure mangtitude

It is the amount of matter a body/object have

It SI unit is Kilograms(kg) or Gram(g)

It is measure using a balancing scale

Weight

It is a vector quantity

It does change depending on the surrounding

It is use to measure mangitude in a specfic direction

It is the amount of gravity pulling an oject or a body toward its core

It SI unit is Newton (N)

It is measure using a newton hand balance or the newton electrical balance

weight =mass* 10g

or (9.8 = 10 are both GRAVITY measurment)

weight=mass*9.8g

Answer: A

Explanation: The mass of a thing never changes but weight is the act of gravity on mass. This rules out B and C since mass can’t change. Leaving A as the only possible answer.

Answer:

proximal

Explanation:

The upper arm is  proximal part to the forearm .

The head of the radius articulates with the capitulum of the humerus and the radial notch of the ulna at the elbow. The articulation between the radius and the ulna at the elbow is known as the proximal radioulnar joint. Distally, it articulates with the ulna again at the distal radioulnar joint.

According to the question

The upper arm is to the forearm  

As per definition of  proximal part  of forearm

The articulation between the radius and the ulna at the elbow is known as the proximal radioulnar joint.

Hence, The upper arm is  proximal part to the forearm .

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OPTION  B IS THE ANSWER

Answer:

The real answer is A 2023 answer -_-

Explanation:

The opposite direction is exerted on the object, so that the forces camel The object is is brought to rest rapidly.

Direction is a term used to describe the way something is moving or pointing. It is often used in reference to the orientation of objects, or the path something is taking. Direction can be described in terms of three-dimensional coordinates, including length, width, and height. Direction can also be described in terms of four cardinal directions (north, south, east and west), and eight ordinal directions (north-east, south-east, south-west and north-west). Direction can also be expressed in terms of angles and compass bearings. Direction is an important part of navigation, and is used to calculate distances. It is also essential for planning journeys and understanding the environment.

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