Calculate the force exerted by a machine that does 4800 J of work over a distance of 22.5 m?​

Answer:

Given Mas (m) =63kg

velocity (v) =4.3m/s

momentum (p) =?

p=mv

63kgx4.3m/s

270.9kg.m/s

the momentum =270.9kg.m /s

If a ball of mass 0.63 kilograms is moving at 4.3 meters/seconds, then the momentum of the ball would be 2.709-kilogram meters/second.

It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle.

Momentum = mass of the object × velocity of the object

As given in the problem we have to calculate the momentum of the ball if it has a mass of 0.63 kilograms and moving with a speed of  4.3 meters/seconds,

The momentum of the ball = 0.63× 4.3

                                             =2.709 kilogram meters/second

Thus, the momentum of the ball comes out to be 2.709-kilogram meters/second.

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Answer:

40.90 mph if I did the math right

The angular speed of the wheel is **100π** radians per minute.

The linear speed of a rotating wheel is the distance traveled by a point on the circumference of the wheel per unit time. In this case, the linear speed is given as 200f(t)/(m)in, where f(t) represents an arbitrary function of time and m represents an arbitrary unit of measurement.

To find the angular speed of the wheel, we need to convert the linear speed into angular speed. Angular speed is defined as the rate at which an object rotates or travels around a circular path. It is measured in radians per unit time.

To convert the linear speed into angular speed, we need to relate the linear speed to the circumference and radius of the wheel. The circumference of a circle is given by 2π times the radius. In this case, the radius of the wheel is given as 2 feet.

Since the linear speed is the distance traveled per unit time, we can calculate the distance traveled in one minute by multiplying the linear speed by 60. Dividing this distance by the circumference of the wheel gives us the number of revolutions per minute. To convert this into radians per minute, we multiply the number of revolutions by 2π.

In summary, to calculate the angular speed of the wheel, we take the given linear speed and convert it into the number of revolutions per minute. We then multiply this value by 2π to obtain the angular speed in radians per minute.

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Answer:

Galileo Galilei developed the first ever telescope

As the electric field gets stronger, the distance between equipotential lines decreases.

Equipotential lines are hypothetical paths through space that link places with an identical electric potential. Equipotential lines, then, are a group of electric field sites where the electric potential is constant. These lines enable a way to see and comprehend the electric field in a specific area because they are always perpendicular to the electric field lines at every point.

In several branches of physics, including electrostatics, electromagnetism, and quantum mechanics, equipotential lines are helpful. They are used to explain and comprehend how charged particles and electric fields behave.

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The refraction angle of the transmitted light is 32.02 degrees (approx.).

The incident light, angle, and refraction angle of transmitted light.

We have to determine the refraction angle of the transmitted light. The angle of incidence is the angle at which an incoming ray intersects a surface, measured between the incident ray and a line perpendicular to the surface at the point of intersection.

As the reflected light is 100% polarized, the angle of reflection is equal to the angle of incidence (i = r).The angle of refraction is the angle between the refracted ray and the normal drawn at the point of incidence.

Using Snell's law, we can determine the angle of refraction. Snell’s law states that:n1 sin i = n2 sin rWhere, n1 and n2 are the refractive indices of the two media.

Here, the incident medium is air and the other medium is unknown. Therefore, we can assume its refractive index to be n2.

The refractive index of air is 1.

n2 sin r = 1 sin 32.9

n2 = 1.000241 (approx.)

The angle of refraction is given by:

The relationship between the sine of the angle of incidence (i) and the refractive index of the first medium (n1) is expressed as the ratio of the sine of the angle of refraction (r) to the refractive index of the second medium (n2).

Substituting the values, we get:

sin r = 1 sin 32.9 / 1.000241

sin r = 0.5374

r = sin-1 (0.5374)

r = 32.02 degrees

Therefore, the refraction angle of the transmitted light is 32.02 degrees (approx.).

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Answer: Friction is the resistance to motion of one object moving relative to another. For example, when you try to push a book along the floor, friction makes this difficult. Force: Force is essentially a push, or a pull action, that can lead to certain outcomes.

Answer:

.12 m or 12 cm.

Explanation:

Interesting question.

The car weights 12000 Newtons.

The spring constant = 25000 n/m

Each spring will support (this isn't true, but it is all you have) 1/4 of the weight of the car.

1/4 * 12000 = 3000 N

Now look at the formula

F = k*x

You know F and you know k.

All you need to do is solve for x.

3000N = 25000 N/m * x        Divide by 25000

3000 N / 25000 N/m  = x

3/25 of a meter = x

x = 12 cm.

Each spring should compress 12 cm.

What makes this question really interesting is what happens when the car hits a bump?

Answer:

It allows people to not float around in the air, it allows earth to orbit, and it holds down the air from the atmosphere so that we could breathe

Answer:

gravity is important bc we cant live without it. The sun's gravity keeps earth in orbit around it. It holds down our atmosphere and air we need to breath.

Explanation:

An object much more massive than Jupiter, but too small to support thermonuclear fusion is called a brown dwarf.

Brown dwarfs are often referred to as failed stars because they are too small to sustain the fusion reactions that occur in the cores of true stars.

They are typically between 13 and 80 times the mass of Jupiter and can emit some heat and light from residual energy left over from their formation, but they are not able to sustain the fusion of hydrogen into helium like a true star. Instead, they slowly cool over time, eventually becoming difficult to detect with telescopes.

Hence, An object much more massive than Jupiter, but too small to support thermonuclear fusion is called a brown dwarf.

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Answer:

You decide to drop two different objects from a tall building and discover that one of the objects lands on the ground five seconds before the other object. What can you conclude? Newton's second law is not valid because each object should experience the same force of gravity and therefore should land at the same time.

Explanation:

You decide to drop two different objects from a tall building and discover that one of the objects lands on the ground five seconds before the other object. What can you conclude? Newton's second law is not valid because each object should experience the same force of gravity and therefore should land at the same time.

You decide to drop two different objects from a tall building and discover that one of the objects lands on the ground five seconds before the other object. What can you conclude? Newton's second law is not valid because each object should experience the same force of gravity and therefore should land at the same time.

Equal download and upload speeds are provided by symmetric DSL (SDSL), which evenly divides the upstream and downstream frequencies.

Users are able to utilize the internet and telephone lines simultaneously. And the reason for that is that voice and digital signals utilize different frequencies to be sent.

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Answer:

bring each tube close to the plastic ball and note any movement of the ball

Explanation:

study island

just took the test!!!!!

Answer:

bring each tube close to the plastic ball and note any movement of the ball

Explanation:

Electric fields can exert forces on objects, even if the objects involved are not touching. One way to demonstrate that electric fields exist around charged objects is to observe the effects of their forces at a distance.

Since the plastic ball of the electroscope is made of insulating plastic and is uncharged, it will be attracted to any charged object brought near it. So Jen can observe the effects of the tube's electric fields by bringing each tube close to the plastic ball and noting any movement of the ball. If the ball moves toward a tube, then the process that Jen used on the tube generated an electric field.

The question is fishing for "balanced force".

But the description in the question is terrible.

The degree mass of many different spiral galaxies close by after which takes a median. They add up all the observations at 21-cm wavelengths because the mass of hydrogen gas is some distance greater than the mass in all of the stars.

Astronomers have four simple techniques to degree the hundreds of galaxies and clusters: rotation curves, random velocities, X-ray emission, and gravitational lensing. Rotation curves: In astronomy, we often infer loads from orbits.

Because it's impossible to weigh a galaxy virtually by way of searching at it tons less when the observer occurs to be inner of it, as is the case with our Milky way researchers deduce a galaxy's mass by means of analyzing the motions of celestial gadgets as they dance across the host galaxy, led by using its gravitational pull.

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The quantity used to measure an object's resistance to changes in rotational motion is called moment of inertia or rotational inertia. Moment of inertia quantifies how mass is distributed in an object relative to its axis of rotation. It determines how difficult it is to accelerate or decelerate an object's rotational motion.

Definition: Moment of inertia, often represented by the symbol I, is calculated by summing the product of each individual mass element in an object and its square distance from the axis of rotation. Mathematically, it is expressed as:

I = ∫ r² dm

Where r is the perpendicular distance from the mass element to the axis of rotation, and dm represents an infinitesimally small mass element within the object.

Distribution of Mass: The moment of inertia depends not only on the total mass of an object but also on how that mass is distributed relative to the axis of rotation. Objects with more mass concentrated farther from the axis of rotation have higher moments of inertia and are more resistant to changes in rotational motion.

Rotational Analog of Mass: In linear motion, mass is a measure of an object's resistance to changes in linear motion (acceleration or deceleration). Similarly, moment of inertia serves as the rotational analog of mass. Objects with higher moments of inertia require more torque (a rotational force) to accelerate or decelerate their rotational motion.

Shape Dependence: The moment of inertia also depends on the object's shape. Objects with more mass concentrated farther from the axis of rotation have larger moments of inertia. For example, a solid disk has a greater moment of inertia compared to a hollow disk with the same mass and outer radius, as more mass is distributed farther from the axis in the solid disk.

Application: The concept of moment of inertia is essential in understanding rotational motion and is used in various practical applications. For instance, it is crucial in engineering and design to determine the stability of rotating systems, such as flywheels, gears, and spinning tops. It is also relevant in physics, explaining phenomena like angular acceleration, conservation of angular momentum, and the behavior of objects rolling or sliding down inclined surfaces.

In summary, the moment of inertia is the quantity used to measure an object's resistance to changes in rotational motion. It takes into account the distribution of mass relative to the axis of rotation and determines how difficult it is to alter an object's rotational speed or change its direction of rotation.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 6500 × 0.3

We have the final answer as

Hope this helps you

The atoms must have the same natural frequency as the light, allowing the atoms to vibrate at the same frequency. The atom collides with other atoms absorbing the energy and converting it to heat.

The absorption of light by a particular material occurs when the frequency of the light wave matches the frequency at which electrons in the atoms of that material vibrate.

The asbroption of this light causes heat to be generated.

Thus, we can conclude that, the atoms must have the same natural frequency as the light, allowing the atoms to vibrate at the same frequency. The atom collides with other atoms absorbing the energy and converting it to heat.

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Answer:

Answer: mechanical advantage is always less than velocity ratio due to friction. So the efficiency of a machine is always less than 100%.

Answer: Although low frequency sound travels further than high-frequency sound, calls at higher frequencies give the bats more detailed information--such as size, range, position, speed and direction of a prey's flight. Thus, these sounds are used more often.

Explanation:

Answer:

b

Explanation:

a Gravity pulls the rock toward the center of Earth.

b The forces between you and the rock are balanced.

c The force of your push is greater than the opposing force.

d There is no friction to help you move the object.

The correct answer would be that the forces between you and the rock are balanced.

In order to get the rock rolling, both the frictional force between the rock and the surface on which it stands as well as the gravitational force acting on its mass must be exceeded. If the applied force balances these forces or falls short, the rock will not move.

The correct option is b.

Answer:

2.4J

Explanation:

Given parameters:

Spring constant  = 120N/m

Extension  = 0.2m

Unknown:

Amount of energy  = ?

Solution:

The energy stored in this stretched spring is called the elastic potential energy.

It can be derived using the expression below:

 Elastic Potential energy  = \(\frac{1}{2}\) ke²  

k is the elastic constant

e is the extension

  Insert the parameters;

        Elastic potential energy  =  \(\frac{1}{2}\)  x 120 x 0.2²  = 2.4J

Hydrogen has partial positive charge and oxygen has partial negative charge.

The link between water is known to be H-O-H. The octet rule states that oxygen must be surrounded by 8 electrons. Four is provided by the two bonds with H. The remaining 4 therefore happen as non-bonding electrons. Since oxygen is more electronegative than hydrogen, it receives a partial negative charge as indicated in image as follows. Covalent bond is present between oxygen and hydrogen atom.

The Lewis structure, also referred to as an electron dot structure, uses a diagram to show how many valence electrons are available in an atom and ready to form bonds with other atoms to create molecules and, eventually, compounds.

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Answer:

The velocity of the rock is 47.24 m/s

The displacement of the rock is 110.48 m

Explanation:

The initial velocity u = 8.0 m/s

time t = 4.0 s

Using

\(v = u + gt\)

where v is the final velocity of the rock after 4.0 s

u is the initial speed = 8 m/s

g is acceleration due to gravity = 9.81 m/s

t is the time = 4.0 s

substituting, we have

\(v = 8 + (9.81*4)\)

\(v = 8 + 39.24\) = 47.24 m/s

Also, using

\(s = ut + \frac{1}{2} gt^{2}\)

where

s is the distance that the stone fell

t is the time = 4.0 s

g is the acceleration due to gravity = 9.81 m/s^2

substituting values, we have

\(s = (8 * 4) + (\frac{1}{2}*9.81*4^{2})\)

s = 32 + 78.48

s = 110.48 m

Given:

By using the relation, we get

→ \(v = u+gt\)

By substituting the values, we get

     \(= 8+(9.8\times 4)\)

     \(= 8+39.24\)

     \(= 47.24 \ m/s\)

hence,

→ \(s = ut+\frac{1}{2} gt^2\)

     \(= (8\times 4)+(\frac{1}{2}\times 9.81\times 4^2 )\)

     \(= 32+78.48\)

     \(= 110.48 \ m\)

Thus the above answer is appropriate.    

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Answer:

C

Explanation:

If a pulley system has an efficiency of 74.2%, then only that fraction of the work performed will be useful. 74.2%=0.742. 0.742*200 is about 148J. Hope this helps!

\(▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪\)

Let's solve ~

Given terms :

The formula to find kinetic Energy is ~

\( \boxed{ \boxed{ \sf{ \frac{1}{2} m{v}^{2} }}} \)

Now, apply the formula according to given situation

\({ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \: \dfrac{1}{2} \times 7 \times ( {4)}^{2} \)

\({ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \: \dfrac{1}{2} \times 7 \times 16\)

\({ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:7 \times 8\)

\({ \qquad{ \sf{ \dashrightarrow}}}  \:  \: \sf \:56 \: \: joules\)

Therefore, the kinetic Energy of the car is 56 joules

Answer:

56 J

Explanation:

Formula to find the kinetic energy is :

\(E_k\) = \(\frac{1}{2} \)  × m × v²

Here ,

m ⇒ mass

v ⇒  velocity

Let us solve now

 \(E_k\) = \(\frac{1}{2} \) × m × v²

     = \(\frac{1}{2} \) × 7 kg × ( 4 ms⁻¹ )²

     = \(\frac{1}{2} \) × 7 × 16

     = \(\frac{1}{2} \) × 112

     = 56 J

Hope this helps you :-)

Let me know if you have any other questions :-)

Answer:

B

Explanation:

Two locomotives approach each other on parallel tracks. Each has a speed of v with respect to the ground. When two trains are travelling towards each other, the effective speed at which they are approaching is the sum of their velocities.

This is since the distance between them is decreasing at the pace of the sum of their speeds. Since the two trains are travelling at the same speed, we can say that they are moving towards each other at a combined speed of 2v. Since the initial distance between them is 8.5 km, the time it takes for them to meet can be calculated by dividing the initial distance by the combined speed.

Therefore,time required = 8.5 km / 2v. If we want to express the time in terms of hours, we must first convert the distance from kilometres to metres and the speed from km/h to m/s.1 km = 1000 m 1 h = 3600 sSo, 8.5 km = 8500 m and v km/h = (1000 v)/3600 m/sHence, the time required = 8500 m / (2 (1000 v)/3600 m/s)) = (15/2) (v/c) seconds, where c is the speed of light. Therefore, the two locomotives will meet in (15/2) (v/c) seconds.

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