a thin-walled, hollow sphere of mass m and radius r is free to rotate around a vertical shaft that passes through the center of the sphere. initially, the sphere is at rest. a small ball of clay of the same mass m moving horizontally at speed v grazes the surface of the sphere at its equator. after grazing the surface, the ball of clay is moving at speed v/2 . what is the angular momentum of the ball of clay about the shaft before it grazes the surface? express your answer in terms of the variables

There are 90 degrees directly overhead. Barnard is at 74 degrees at Sam's position, 1300.0 kilometers south. The part of the 360 degree circle that corresponds to Hua's circumference is the difference between 90 and 74, or 16 degrees. 1300.0 km is therefore 16/360 of the circle, or 0.044 times the circumference. 29.250 km is the circumference (1300 divided by 0.044). Radius divided by two gives the circumference equation. Therefore, 2r=29250 and the radius of Hua=4655.3 km

Astronomy is a scientific science that examines celestial objects and phenomena (from the Ancient Greek "o" (astronoma), "science that investigates the laws of the stars"). In order to describe their creation and evolution, it makes use of mathematics, physics, and chemistry. Planets, moons, stars, nebulae, galaxies, and comets are among the interesting celestial bodies. Supernova explosions, gamma ray bursts, quasar, blazar, pulsar, and cosmic microwave background radiation are examples of relevant phenomena. Astronomy is the study of everything that comes from outside the atmosphere of the Earth. Astronomical cosmology is the study of the cosmos as a whole.

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Radii is a vital feature of the elements, and it can be useful in determining the characteristics of elements in various chemical and physical processes. The radii of atoms and ions of the same element differ due to their various charge and mass characteristics.

Atomic and ionic radii increase as you move down a group on the periodic table, and decrease as you move across a period from left to right due to increased nuclear charge, making the electrons closer to the nucleus. The size of an atom and ion also changes due to the number of electrons charge, and electronic configuration.In order of increasing radius, the arrangement of \(Ne, F-, O2-, Br-, Rb\) is given as follows:

\(Ne < F- < O2- < Br- < Rb+\)

Rb+ has the smallest radius due to its large nuclear charge and fewer electrons in the valence shell.

As a result, they are larger than Rb+. O2- has more electrons than Ne and is the largest among the given ions and atoms. It is important to note that in certain conditions, the trends in radii may not be valid because of hybridization and other factors. Nonetheless, this arrangement is valid for the given ions and atoms.

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Answer:  10 m/s

We're told the speed is constant, so it's not changing throughout the time period given to us. So throughout the entire interval, the speed is 10 m/s.

Place a piece of paper in front of and behind the monitor. If the numbers are reduced sufficiently, the source emits alpha particles.

The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that wants to give up some energy in order to move to a more stable form.

Determine the background count rate first, followed by the source count rate without an absorber, to identify the radiation type.

Put a piece of paper in front of the monitor and behind the source. The source emits alpha particles if the numbers are sufficiently decreased.

Hence by founding the count rate the teacher will find the type of radiation.

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Answer:

C

Explanation:

The starting skill level of the physical activities included in a personal fitness program should be determined from other individuals' fitness programs is a statement which is not true. Everyone starts their personal fitness journey at a different level which should be regarded . A fitness test should be taken to determine where an individual should start their new lifestyle.

Answer:

C. I got it right :)

Explanation:

So free point OK ty see ya!

Answer: 0

Explanation:

75 newtons will push back canceling it out make it 0

If I push on the wall with 75 Newtons of force, the wall will push back with 75 Newtons of force.

Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.

It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.

The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.

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The current produced by voltage in a circuit is impeded by Electric resistance

When charged electrons (current) are propelled through a conducting loop by the pressure of an electrical circuit's power source, they can complete activities like lighting a lamp. In an essence, voltage represents pressure and is measured in volts.

This is so because resistance arises from the collision of electrons with the conductor's atoms. In this situation, a longer conductor will result in more interactions and more resistance. The area of a conductor's cross-section has an inverse correlation with the conductor's resistance. An electrical circuit's resistance to current flow is measured as electrical resistance. The Greek letter omega () represents the measurement unit for resistance, known as ohms.

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Answer:

Explanation:

A change in an object’s motion—such as Xander speeding up on his scooter—is called acceleration. Acceleration occurs whenever an object is acted upon by an unbalanced force. The greater the net force acting on the object, the greater its acceleration will be, but the mass of the object also affects its acceleration. The smaller its mass is, the greater its acceleration for a given amount of force. Newton’s second law of motion summarizes these relationships. According to this law, the acceleration of an object equals the net force acting on it divided by its mass.

The ratio of MbO₂ to Mb at equilibrium with a partial pressure of oxygen pO₂ is 0.00002.

The ratio of MbO₂ to Mb in an aqueous solution at equilibrium with a partial pressure of oxygen pO₂ = 400 Pa can be calculated using the equation ΔG∘=−30.0 kJmol−1 at 298 K and pH = 7.
The equation used is: ΔG∘ = -RT ln (MbO₂/Mb), where R is the ideal gas constant and T is temperature in Kelvin. Rearranging this equation gives MbO₂/Mb = e^(-ΔG∘/RT).
Therefore, the ratio of MbO₂ to Mb at equilibrium with a partial pressure of oxygen pO₂ = 400 Pa is e^(-30.0/8.314*298) = 0.00002.

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Answer:

It takes 1.14 s to move the box 4.20 m.

Explanation:

Using Newton's second law we have:

\(Fcos(35)-F_{f}=ma\)

\(Fcos(35)-\mu mg=ma\)

F is the force exerted and m the mass of the books

\(Fcos(35)-\mu mg=ma\)

\(477cos(35)-(0.58*315)=\frac{315}{9.81}a\)

So, the books accelerate at:

\(a=6.48\: m/s^{2}\)

We know that the initial velocity is zero, so using the kinematic position equation, we have:

\(x=\frac{1}{2}at^{2}\)

So, we just need to solve the equation for t.

\(4.2=\frac{1}{2}6.48t^{2}\)

\(t=\sqrt{\frac{2*4.2}{6.48}}\)

Taking the positive value of t:

\(t=1.14\: s\)

Therefore, it takes 1.14 s to move the box 4.20 m.

I hope it helps you!

Answer:

a) 6498.84 kW

b) 0.51

c) 0.379

Explanation:

See the attached picture below for the solution

Given-

Temperature at state 1 \(T_{1}\) is 40 degree cel. This is equal to the 313 K.

Temperature at state 1 \(T_{2}\) is 650 degree cel. This is equal to the 923 K.

To know the mass flow rate use the idol gas equation. Idol gas equation for a substance can be given as,

\(PV=nRT\)

Rewrite this equation for \(n\),

\(n=\dfrac{PV}{RT}\)

Put the value of known variable from the question,

\(n=\dfrac{100\times\dfrac{850}{60} }{0.287\times 313}\)

\(n=15.77\)

Thus the value of n is 15.77 kg/sec.

Temperature at state 2 is,

In Bryon cycle we know that the processes 1-2 and 3-4 are isotropic. Hence,

\(T_{2} =T_{1}\left (1+ \dfrac{r_{p}^{\dfrac{\gamma-1}{\gamma}-1} }{c_{v} } \right )\)

\(T_{2} =313\left (1+ \dfrac{16^{\dfrac{1.35-1}{1.35}-1} }{0.821 } \right )\)

\(T_{2} =700\)

Temperature at state 3 is,

\(T_{3} =\dfrac{T_4}{1+c_p(r_p^{\dfrac{\gamma-1}{\gamma}-1}-1)}\)

Put the value in above equation we get,

\(T_3=1682\)

\(W=mc_p(T_i{n}-T_{out})\)

\(W=mc_p(T_3-T_2-T_4+T_{1})\)

\(W=15.77\times1.109(1682-700-923+313)\)

\(W=65\)

Thus the net power output is 70 watt.

\(r_b=\dfrac{T_2-T_1}{T_3-T_4}\)

\(r_b=\dfrac{700-313}{1682-923}\)

\(r_b=0.51\)

Hence the back work ratio is 0.51.

\(\eta=\dfrac{W}{Q_{in}}\)

\(\eta=\dfrac{65}{mc_p(T_3-T_2)}\)

\(\eta=0.379\)

Hence, for the given problem the net power output is 70 watt,the back work ration is 0.51, and the thermal efficiency is 0.379.

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Answer:

Newton's Second Law tells us that the more mass an object has, the more force is needed to move it. A larger rocket will need stronger forces (eg. more fuel) to make it accelerate. The space shuttles required seven pounds of fuel for every pound of payload they carry.

Explanation:

Answer:

Explanation:

3.011 x 10^24 atoms

Answer:

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Answer:

R= v/I

R= 9/1.05=8.5714 ohms

The focal length of the glasses needed is 18.04cm.

1) To determine the focal length (f) of the glasses needed when they are 2 cm away from her eyes, we can use the lens equation:

1/f = 1/do + 1/di

Where do is the object distance (25 cm), di is the image distance (60 cm - 2 cm = 58 cm). Plugging in the values:

1/f2cm = 1/25 + 1/58
f2cm = 1/(1/25 + 1/58) ≈ 18.04 cm

2) For the glasses that are 3 cm away from her eyes, di will be 60 cm - 3 cm = 57 cm. Using the lens equation:

1/f3cm = 1/25 + 1/57
f3cm = 1/(1/25 + 1/57) ≈ 17.32 cm

3) To find the focal length of the contact lenses needed for a nearsighted person, we need to use the lens equation:

1/f = 1/do + 1/di

Since he wants to see objects at a great distance (infinity), the image distance (di) will be at his farpoint. For the left eye, the farpoint is 482 cm, and the object is at infinity (do = ∞). Plugging in the values:

1/fleft = 1/∞ + 1/482
fleft = 1/(0 + 1/482) ≈ -482 cm

4) For the right eye, the farpoint is 632 cm. Using the lens equation:

1/fright = 1/∞ + 1/632
fright = 1/(0 + 1/632) ≈ -632 cm

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Answer:

D

Explanation:

Mgo is ionic and N2 has covalent bonds

Answer:

Give person above me brainliest

Explanation:

Answer:

Nitrogen has Electronic configuration 1s2 2s2 2p3. Fluorine has Electronic configuration 1s2 2s2 2p5 i.e. nitrogen has half filled p subshell that makes it more stable than fluorine and fluorine requires only 1 electron to complete it's octet to get stable..Therefore Fluorine is more reactive than Nitrogen.

Hope it helps you

Answer:

Explanation:

then

The reading on the thermometer after 3 more minutes will be -13∘C. The thermometer will never read -4∘C after being taken outdoors.

To solve this problem, we can assume that the rate of change in temperature follows a linear pattern.

Let's first calculate the rate of change in temperature per minute:

Rate of change = (Final temperature - Initial temperature) / Time

a) After one minute:

Rate of change = (11∘C - 19∘C) / 1 minute = -8∘C/minute

To find the reading on the thermometer after 3 more minutes, we can multiply the rate of change by the time:

Change in temperature = Rate of change × Time

After 3 more minutes:

Change in temperature = -8∘C/minute × 3 minutes = -24∘C

The initial temperature was 11∘C, so the final temperature after 3 more minutes will be:

Final temperature = Initial temperature + Change in temperature = 11∘C - 24∘C = -13∘C

b) To find when the thermometer will read -4∘C, we need to determine the time it takes for the temperature to change from -5∘C to -4∘C.

Rate of change = (-4∘C - (-5∘C)) / Time

Rate of change = 1∘C / Time

We can rearrange the equation to solve for time:

Time = 1∘C / Rate of change

Substituting the given rate of change:

Time = 1∘C / (-8∘C/minute) = -1/8 minute

Since time cannot be negative, we can conclude that the thermometer will never read -4∘C after being taken outdoors.

Please note that this calculation assumes a linear rate of change in temperature, which might not hold true in all situations.

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The centers of the two spherical objects that are apart is 4.55 x 10³m.

Two spherical objects have masses of 3.1 x 10⁵ kg and 6.5 x 10³ kg. The gravitational attraction between them is 65N. The centers of the two spherical objects that are apart is 4.55 x 10³m. The gravitational force between two objects with masses m1 and m2 that are separated by a distance r is given by the equation:

F = \(\frac{G m1 m2}{r^{2} }\)

where G is the gravitational constant, m1 and m2 are the masses of the objects in kilograms, and r is the distance between their centers in meters. In this problem, we are given the gravitational force between the two objects, F, and the masses of the objects, m1 and m2. We can use these values to solve for the distance r between the centers of the objects. Gravitational force is the force that attracts two bodies in the universe. it is applicable everywhere. it is applicable on every body whether it is small or big, it applies everywhere.

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4.55 x \(10^9\) m are distance between their centre.

The gravitational force between two objects with masses m1 and m2 that are separated by a distance r is given by the equation:

F =  \(\frac{Gm_1m_2}{r^2}\)  where G is the gravitational constant, m1 and m2 are the masses of the objects in kilograms, and r is the distance between their centers in meters.

In this problem, we are given the gravitational force between the two objects, F, and the masses of the objects, m1 and m2.

We can use these values to solve for the distance r between the centers of the objects.

Substituting the given values into the equation above, we get:

65 = G*(3.1 x 10^5 kg)(6.5 x 10^3 kg)/\(r^2\)

Solving for r, we find that the distance between the centers of the objects is approximately:

r = sqrt(G(3.1 x 10^5 kg)(6.5 x 10^3 kg)/65)

=> sqrt((6.674 x 10^11 )(3.1 x 10^5 kg)(6.5 x 10^3 kg)/65)

= 4.55 x \(10^9\) m

Thus, the distance between the centers of the two objects is approximately 4.55 x \(10^9\) m .

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When a bar magnet is oriented perpendicular to a uniform magnetic field, two important phenomena occur: the force and the torque on the magnet.

Force: The magnetic field exerts a force on the magnet due to the interaction between the magnetic field and the magnetic dipole moment of the magnet. In this case, the force will be perpendicular to both the magnetic field and the magnet. The force will tend to align the magnet with the magnetic field. If the magnet is free to move, it will experience a translational force that may cause it to move in the direction of the force.

Torque: The magnetic field also exerts a torque on the magnet, trying to rotate it. The torque is greatest when the magnet is perpendicular to the magnetic field lines. The torque will try to align the magnet with the magnetic field. If the magnet is free to rotate, it will experience a rotational force that may cause it to align itself with the magnetic field.

The exact magnitude and direction of the force and torque will depend on the strength of the magnetic field, the orientation of the magnet, and the magnetic properties of the magnet.

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Answer:

1)  "the acceleration of an object increases by force applied to it" is correct, as long as the force is increasing, acceleration will increase.

2) "acceleration of an object increases by force applied to it" is correct, but only if one assumes the force is increasing (directly proportional).

Explanation:

Newton's second law states that force is the product of mass times acceleration:  F=ma

1.  "acceleration of an object increases by force applied to it" is correct:  As  force is increased (and mass stays the same), the acceleration must also increase.

2.  "acceleration . . . decreases based on its mass" is confusing, since it does not say in what direction the mass is changing.  As the mass increases, the acceleration will decrease, assuming constant force.  If the mass decreases, the accelaration will increase.The statment should read "inversely proportional."

The type of switch that connects all devices in a rack to the rest of the network is called a "Top of Rack (ToR) switch".

Top of Rack (ToR) switch is a type of network switch that is typically installed in a data center or server room at the top of a server rack. The main purpose of a ToR switch is to provide high-bandwidth connectivity to the servers or other network devices within the rack and to connect them to the rest of the network.

ToR switches are commonly used in large-scale computing environments, such as cloud data centers, web hosting facilities and enterprise server rooms where they help to improve network efficiency and simplify network management.

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Answer:

Relative density is proportional to the frequency of a material's density to its water density. Because both have had the same proportions, their proportion is also dimensionless.

Explanation:

The dimension of relative density:-

Relative Density of a Substance (R.D.) = Substance Density / Water Density.

Therefore, R.D. Is just a ratio or a number. There are no units or dimensions to it.

For example:- The density of iron is 8.5 GM's/cm^3 & the density of water is 1 gm/cm^3 (in cgs units).

Tension:-   Surface tension is the propensity of the new worlds and infographics to reduce to the particle size which is least appropriate. Atmospheric pressure helps insects (e.g. water striders) can travel or move and on a water surface, typically object is sensed rather than water.

The speed of ultrasound waves on the surface of the heart is 0.64 Hz

The reflection of 2.70 mhz ultrasound waves from the surface of a fetus's beating heart is combined with the 2.70 mhz wave to produce a beat frequency that reaches a maximum of 65 hz. This means that if we double the speed at which it is reflected, we will find ourselves at 65 hz.

We know that the surface of a fetus's beating heart has an area of approximately 1 sq cm and a thickness of 1 mm. This means that its volume is approximately 1 mm cube. Since we have already calculated that the speed of ultrasound waves within the body is 1540 m/s, this means that they travel through one square centimeter per second.

If we multiply this by our previous calculation, we can determine an upper limit on how fast they can travel:

1 / (1 / π) * 1540 = 1 / 10^6

≈ 0.64 Hz

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The basic unit and symbol in the metric system is D) all of the above.

The metric system is a decimal-based system of measurement used worldwide. It utilizes a set of standard units and symbols to represent different quantities. In the metric system, there are three fundamental units commonly used: centimeter (cm) for length, kilogram (kg) for mass, and milliliter (mL) for volume. These units are considered basic because they form the foundation for measuring length, mass, and volume in the metric system.

The centimeter (cm) is used to measure small lengths, such as the height of a person or the width of an object. The kilogram (kg) is the unit for mass and is commonly used to measure the weight of an object. The milliliter (mL) is a unit of volume often used to measure the capacity of liquids or small amounts of substances.

All three units (centimeter, kilogram, milliliter) are widely recognized and used in scientific, industrial, and everyday contexts. They provide a standardized and consistent way of measuring and comparing quantities. Therefore, the correct answer is "D) all of the above" because each of these units is a basic unit and symbol in the metric system.

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Sound travels at a known speed, the time interval between the flash and the thunderclap can be used to calculate the approximate distance to the lightning strike.Light travels at a speed of approximately 299,792 kilometers per second in a vacuum, while sound travels at a much slower speed of around 343 meters per second in dry air at 20 degrees Celsius.

The scientist observed the lightning flash several seconds before hearing the sound of the thunderclap because light travels much faster than sound. Light travels at a speed of approximately 299,792 kilometers per second in a vacuum, while sound travels at a much slower speed of around 343 meters per second in dry air at 20 degrees Celsius.Given that the scientist was several kilometers away from the lightning flash, the light from the flash reached the scientist's location almost instantaneously. In contrast, the sound waves generated by the thunderclap took time to travel through the air over the distance between the scientist and the lightning. Consequently, it took several seconds for the sound to reach the scientist's ears.The time difference between seeing the lightning flash and hearing the thunder allows us to estimate the distance of the lightning strike.

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