which of the following is not a technique used to measure the total mass of a cluster of galaxies? observations of gravitational lensing of galaxies behind the cluster observations of the temperature of the hot intracluster medium observations of the luminosity of the galaxies observations of the motions of galaxies within the cluster

Answer:

Distance = 2m

Explanation:

Given the following data;

Workdone = 270J

Force = 135N

To find the height (distance);

Workdone = force * distance

Substituting into the equation, we have

270 = 135 * distance

Distance = 270/135

Distance = 2m

Answer:

Jupiter Neptune moon Uranus

Explanation:

Answer:

The orbital speed can be found using v = SQRT(G*M/R). The R value (radius of orbit) is the earth's radius plus the height above the earth - in this case, 6.59 x 106 m.

The velocity of an object orbiting at height 2Re above the surface of earth be 14380 m/s.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

The orbital velocity of an object orbiting around the Earth can be expressed as:

v = √(GM/R).

Where:

G = universal gravitational constant = 6.67408 × 10⁻¹¹N m² kg⁻².

M = mass of Earth = 5.97219 × 10²⁴ kilograms.

R = distance between the object and the center of Earth.

According to the question,  the object orbiting at height 2\(R_e\) above the surface of earth. So,  distance between the object and the center of Earth is: R = radius of Earth + 2\(R_e\)

= 3\(R_e\)

= 3 × 6,371 km

= 1.9113 × 10⁶ m.

So, the velocity of the object : v =  √(GM/R).

= √( 6.67408 × 10⁻¹¹× 5.97219 × 10²⁴/1.9113 × 10⁶ ) m/s

= 14380 m/s.

Hence,  the velocity of the object be 14380 m/s.

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True. When a muscle contracts, the actin myofilaments slide past the myosin myofilaments.

This process, called cross-bridge formation, is the basis of skeletal muscle contraction. It occurs when myosin heads bind to actin filaments and create tension, which causes the actin filaments to slide past the myosin filaments and shortens the muscle. The energy for this process is provided by adenosine triphosphate (ATP). Cross-bridge formation is a continuous cycle of the myosin head binding to the actin filament, pulling the filament forward, and then releasing the filament in order to bind to a new site. As this cycle is repeated, the muscle fibers contract.  

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The diagram of  free body diagram represents the forces acting on an object the moment the applied is removed ,but while the object is still moving forward is attached in the answer.

The relative strength and direction of all forces operating on an object in a specific circumstance can be depicted using free body diagrams (FBDs), which are helpful tools. The careful creation of a free-body diagram is a prerequisite for the analysis and description of the majority of physical processes. In a free body diagram, the size of the arrow represents the force's magnitude, while the direction of the arrow represents the way it acts.

Describes what a free body diagram is: A graphic, dematerialized, symbolic representation of the body (a structure, element, or fragment of an element) in which all connecting "parts" have been eliminated is known as a free-body diagram.

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Answer:

B.

Explanation:

Intrusive and extrusive rocks are igneous rocks and marble is metamorphic, by the process of elimination, B would be the correct answer.

Answer:

answer is B

Explanation:

Answer:

amplitude

Explanation:

wave is a called the crest, and the low point is called the trough. For longitudinal waves, the compressions and rarefactions are analogous to the crests and troughs of transverse waves. The distance between successive crests or troughs is called the wavelength. The height of a wave is the amplitude.…

The statement "before each trial one should reshape the bob into something like a ball" is false regarding the experiment.

If we assume the collision between the bob and the box is completely inelastic, then shape of the bob does not play any role in the time period of the plumb bob or the collision impact of the bob on the box. However the second statement which says that the initial position for the box should be just touching the pendulum bob, is true. This is because then initial position of the bob will become the mean position and we know at the mean position the kinetic energy of the bob is maximum.

For the third statement, the pendulum bob should hit close to the bottom of the box during the collision to make the box move, is also true. This is because the bottom surface experiences the maximum friction force, which can be reduced at maximum amount if bob impact closer to the bottom.  

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In conclusion, doubling the distance between two objects of the same mass would result in the gravitational force between them to decrease by a factor of four. This demonstrates the inverse square relationship between distance and gravitational force.

Doubling the distance between two objects of the same mass would result in the gravitational force between them decreasing by a factor of four.

This is because the force of gravity is inversely proportional to the square of the distance between the objects.

To understand this, let's consider Newton's Law of Universal Gravitation. According to this law, the gravitational force (F) between two objects is given by the equation:

F = G * (m1 * m2) / d²

Where G is the gravitational constant, m1 and m2 are the masses of the objects, and d is the distance between them.

Now, if we double the distance (d) between the objects, the equation becomes:

F' = G * (m1 * m2) / (2d)²

Simplifying this equation, we get:

F' = G * (m1 * m2) / 4d²

Comparing the two equations, we can see that the force (F') is one-fourth (1/4) of the original force (F). In other words, doubling the distance decreases the gravitational force between the objects by a factor of four.

In conclusion, doubling the distance between two objects of the same mass would result in the gravitational force between them to decrease by a factor of four. This demonstrates the inverse square relationship between distance and gravitational force.

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Answer:

i. rubbing the material against a magnet

ii. placing the material in a magnetic field of opposite polarity

iii. placing the material near a strong magnet

Explanation:

Ferromagnetic materials are majorly metals which can be easily attracted by a magnet. ferromagnetic materials are made up of domains, behaves as minute pieces of magnet. They can be rearranged to align when under the influence of an external magnetic field.

The alignment of the domains in a ferromagnetic material can be caused by either of the following: rubbing the material against a magnet, placing the material in a magnetic field of opposite polarity, placing the material near a strong magnet.

Answer:

B, D, E

Explanation:

edg2020

Based on the observed redshift of the star's light, we can conclude that the star is moving away from Earth.

When the wavelengths of light emitted by a star appear to be shifted toward the red end of the electromagnetic spectrum, it indicates a phenomenon known as redshift. Redshift occurs when an object, such as a star, is moving away from the observer.

This phenomenon is a result of the Doppler effect, which describes how the observed frequency (or wavelength) of a wave changes relative to an observer's motion. When an object is moving away from the observer, the wavelengths of light it emits are stretched or "stretched out," causing them to appear redder. This is because the motion of the source of the light causes the waves to have a longer wavelength, resulting in a redshift.

Therefore, based on the observed redshift of the star's light, we can conclude that the star is moving away from Earth.

Therefore, the correct answer is d. moving away from Earth.

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Answer:

Even your pencil and a piece of paper attract one another. You can't feel this force because the masses of the pencil and paper are so small. Even you exert a gravitational force on other objects. Because your mass is so much less than the mass of the Earth, you can't feel your gravitational force.

In simple word gravitational force is directly proportional to weight of and objects and indirectly proportional to distance.

F=G(m1 x m2) /r^2

F = force

G = gravitational constant

m_1 = mass of object 1

m_2 = mass of object 2

r = distance between centers of the masses

Answer:

The number of beats is 10.58 in 35°C.

Explanation:

The beat frequency is given by : f₁-f₂

At 5°C, f₁-f₂ = 4

We need to find the number of beats in 35°C​.

The frequency in a standing wave is proportional to \(\sqrt T\).

So,

\(\dfrac{f_1-f_2}{f_1'-f_2'}=\dfrac{\sqrt {T}}{\sqrt{T'}}\\\\f_1'-f_2'=(f_1-f_2)\times \dfrac{\sqrt{T'}}{\sqrt{T}}\\\\f_1'-f_2'=4\times \dfrac{\sqrt{35}}{\sqrt{5}}\\\\f_1'-f_2'=10.58\)

So, the number of beats is 10.58 in 35°C.

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:

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

Answer:

hope this helps you :)

Explanation:

An object is in motion if its position changes relative to another object. To decide if you are moving, you can use your chair as a reference point. A reference point is a place or object used for comparison to determine if something is in motion.

The claim can be Cosmetics, hygiene, and cleaning product emissions may be dangerous.

Evidence 1: Effect of Air Quality

Volatile organic compounds (VOCs), including formaldehyde, benzene, and toluene, can be found in a variety of cosmetic, hygiene, and cleaning goods. These VOCs have the potential to evaportate and cause indoor air pollution.

Environmental impact is evidence number two

Cosmetics, hygiene, and cleaning goods can have a detrimental environmental impact during manufacturing, usage, and disposal. Microplastics and certain chemicals are among the substances present in these items that may find their way into rivers and endanger aquatic life.

Evidence 3: Worker health effects

Occupational health risks can be present for workers who manufacture and produce hygiene, cleaning, and cosmetic items.

Reasoning: It is clear from the research that emissions from cosmetic, hygiene, and cleaning goods have the potential to be harmful.

Thus, this way, harmful are the emissions from cosmetics, hygiene, and cleaning products.

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Answer:

B mate

Explanation:

Projectile motion is  a motion where an object moves in a bilaterally symmetrical path

Projectile motion is a form of motion experienced by an object or particle that is projected near Earth's surface and moves along a curved path under the action of gravity only.

If an object is thrown up by making a certain angle with respect to  ground ( let say theta) up in the sky , it will reach a maximum height after which it follows a symmetrical path as it comes down due to  the action of gravity . The path followed from the beginning till end will be a parabolic in this case .

It is a motion where an object moves in a bilaterally symmetrical path .

Projectile motion only occurs when there is only one force applied at the beginning of the trajectory, after been released object comes in the action of gravity .

General form of equation of trajectory  of Projectile motion   can be written as :

y = x tan(theta ) - g(x^2)/(2(u^2)cos^2(theta))

where y = horizontal component

           x = vertical component

           g = gravity

           u = initial velocity

           theta = angle of inclination of the initial velocity from horizontal axis

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Answer:

F

Explanation:

F is not a molecule, a molecule contains two or more cells. But F stands for fluorine, which I think is a singular cell.

Answer:

43.3 m/s.

Explanation:

Assuming the potential energy is due to the gravitational potential energy, we can use the conservation of energy to find the kinetic energy:

Total energy = Potential energy + Kinetic energy

Kinetic energy = Total energy - Potential energy

Kinetic energy = 300 J - 40 J = 260 J

However, we need to know the mass of the object to convert the kinetic energy to velocity. We can use the potential energy to find the mass:

Potential energy = mgh

40 J = m(9.81 m/s^2)(300 m)

m = 0.137 kg

Now we can use the kinetic energy to find the velocity:

Kinetic energy = (1/2)mv^2

260 J = (1/2)(0.137 kg)v^2

v^2 = (2*260 J) / 0.137 kg

v = 43.3 m/s (rounded to one decimal place)

Therefore, the kinetic energy is 260 J and the velocity of the object when it reaches the ground is 43.3 m/s.

Answer: Remove your foot from the gas pedal and slow down

Explanation:

Hydroplaning also refers to aquaplaning and this refers to the scenario whereby there's a layer of water that builds between the tyres of a car and the surface of the road which then brings about a loss of traction which eventually leads to a situation whereby the car doesn't respond to control inputs.

This lack of traction with the pavement takes away your control of the vehicle and to regain control of the vehicle, one should remove your foot from the gas pedal and slow down.

The kinetic energy of an object is the energy it possesses due to its motion. In this problem, the car comes to a stop without skidding, meaning that all of its initial kinetic energy is dissipated as work done by the brakes.

The work done by the brakes is given as 50,000 J, and we know that work is equal to the change in kinetic energy. Therefore, the initial kinetic energy of the car is also 50,000 J. This means that the car was moving with a significant amount of energy before the brakes were applied, which highlights the importance of braking systems in ensuring safety on the road.

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Hi there!

\(\large\boxed{D. \text{ } 3.0 kg}}\)

Use the following equation to solve:

F = ma, where:

F = Force (N)

m = mass (kg)

a = acceleration (m/s²)

Thus:

15 = 5m

15/5 = m

mass = 3 kg

The foreman shouts at John to hurry up and he increases his pushing force to 50N. Calculate the wheelbarrow's acceleration. When the foreman shouts at John to hurry up and John increases his pushing force to 50N, the wheelbarrow's acceleration can be calculated as follows:

F = 50N and m = 20 kg. Now, the acceleration of the wheelbarrow can be calculated using the formula below;

F = m × a, Where, F is the force applied, m is the mass of the object and, a is the acceleration of the object.

Rearranging the formula, we have; a = F/m.

Substituting the values in the formula; a = 50/20a = 2.5 m/s².

Therefore, the wheelbarrow's acceleration is 2.5 m/s².

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Answer:

She was her mother.

:-)

Answer:

She was her mother.

Explanation:

The velocity of the projectile when it lands is 71.218 m/s.

The resultant velocity of the projectile when it lands is calculated by applying the following formula.

V = √ ( Vx²  + Vy² )

where;

The given parameters include the following;

the vertical velocity of the projectile = 44 m/s

the horizontal velocity of the projectile = 56 m/s

V = √ ( Vx²  + Vy² )

V = √ ( 56²  + 44² )

V = 71.218 m/s

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Answer: 1,270 J

Explanation: APEX

Answer: 1,270 J

Explanation:

Just did it!!

Answer:

the answer is at the BOTTOM OF THEIR QUESTION

Explanation:

IT IS CORRECT BTW

Answer:

the magnets share forses when they come in contact with the other making them the same