can i get help please

Answer:

W = m g h      increase in PE due to lfting bag

W1 = 90 kg * 9.8 m/s^2 * 6 m

W2 = 45 kg * 9.8 m/s^2 * 12 m

W2 / W1 = 1        the work is the same in both cases

The power required is different

P = W / t

Since t is smaller for W2 and the work output is the same the power required to produce W2 is twice as great

The event horizon is directly related to the mass of the black hole, with larger black holes having larger event horizons.

What is Black Hole?

A black hole is an astronomical object that has collapsed to such a small size that its gravitational pull is so strong that nothing, not even light, can escape it. Black holes are formed from the remnants of massive stars that have run out of fuel and undergone a catastrophic collapse, or from the merging of two or more smaller black holes.

M87 and Ton 618 are both supermassive black holes, with masses estimated to be around 6.5 billion and 66 billion times the mass of the Sun, respectively. However, the size of their event horizons would depend not only on their mass but also on their spin and the density of the surrounding matter. It is therefore not possible to predict which black hole would be bigger without additional data and calculations.

It is worth noting that the first image of a black hole that was released in 2019 was actually an image of the event horizon of the black hole in M87, not the black hole itself. The event horizon of M87's black hole was estimated to be around 40 billion km in diameter, which is larger than the entire solar system.

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The negative angular acceleration required to bring the wheel to rest is approximately -0.126 rad/s^2, and the time needed to bring the wheel to rest is approximately 20.04 seconds.

Let's first find the initial and final angular velocities of the wheel.

The initial angular velocity is zero because the wheel is initially at rest.

The final angular velocity can be found using the formula:

ωf = ωi + αt

where

ωf = final angular velocity

ωi = initial angular velocity (which is zero)

α = angular acceleration (5.0 rad/s^2)

t = time (8.0 s)

ωf = 0 + (5.0 rad/s^2)(8.0 s) = 40.0 rad/s

The negative angular acceleration can be found using the formula:

Δω = ωf - ωi = αt

where

Δω = change in angular velocity (which is equal to the final angular velocity because the initial angular velocity is zero)

α = angular acceleration (which is negative because the wheel is slowing down)

t = time

So we have:

Δω = 40.0 rad/s

αt = -α(10 rev)(2π rad/rev)/t

where we have converted 10 revolutions to radians (2π radians per revolution).

Setting these two expressions equal to each other and solving for α, we get:

α = -Δω/t = -(40.0 rad/s)/(10 rev x 2π rad/rev x t)

α = -2.53/t rad/s^2

Finally, we can use the formula for angular deceleration to find the time needed to bring the wheel to rest:

ωf^2 = ωi^2 + 2αΔθ

where

Δθ = angle through which the wheel rotates during the deceleration (which is 10 revolutions)

ωf = final angular velocity (which is zero)

ωi = initial angular velocity (which is 40.0 rad/s)

α = angular acceleration (which is negative)

So we have:

0 = (40.0 rad/s)^2 + 2(-2.53/t)(10 rev x 2π rad/rev)

0 = 1600 - 318.48/t

t = 20.04 s

Therefore, the negative angular acceleration required to bring the wheel to rest is approximately -0.126 rad/s^2, and the time needed to bring the wheel to rest is approximately 20.04 seconds.

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The force line which shows the force of gravity that the Earth exerts on the Moon is line A.

The reason Line A is thicker than arrow B is because the Earth exerts a greater force of gravity on the Moon.

According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. Therefore, the gravitational force exerted by the Earth on the moon is equal in magnitude and opposite in direction to the gravitational force exerted by the moon on the Earth.

The force of gravity between two objects depends on their masses and the distance between them, so the force of gravity between the Earth and moon is proportional to their masses and the distance between them. While the moon's gravity does have an impact on the Earth, such as causing ocean tides, it is not a greater force than the Earth's gravity.

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The power the force developed in pushing the box up the ramp is 2759.009 watts

Power is simply defined as the rate at which work is done. It can be expressed mathematically as

Power (P) = work (W) / time (t)

But

Work = force (F) × distance (d)

Therefore,

P = Fd / t

But

velocity (v) = distance (d) / time (t)

Thus,

Power = force (F) × velocity (v)

With the above formula, we can obtain the power developed by the force. Details below:  

Power = force (F) × velocity (v)

Power = 1283.26 × 2.15

Power = 2759.009 watts

Thus, the power is 2759.009 watts

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The kinetic energy of an object is the energy that is associated with its motion. The average kinetic energy of the particles that make up an object is a measure of the temperature of the object.

What is kinetic energy?

Kinetic energy is the energy that an object possesses due to its motion. Any object that is moving has kinetic energy. The amount of kinetic energy that an object has depends on its mass and its velocity. The equation for calculating the kinetic energy of an object is KE = 0.5 * m * v^2, where KE is the kinetic energy, m is the mass of the object, and v is the velocity (speed) of the object.

The correct answer is A: the average kinetic energy of the particles that make up an object.

The kinetic energy of an object is the energy that is associated with its motion. The average kinetic energy of the particles that make up an object is a measure of the temperature of the object. The higher the temperature of an object, the greater the average kinetic energy of its particles.

Option B describes potential energy, which is the energy stored in an object due to the position of its particles. This energy can be converted into kinetic energy if the object is allowed to move.

Option C describes thermal energy, which is the total energy of all the particles within an object, including both kinetic and potential energy.

Option D describes heat transfer, which is the transfer of thermal energy from one object to another due to a temperature difference.

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When Weight of 7294.3 N can be supported by boom if force 7800 is applied on the cable and there is no resultant rotation at point C.

Torque is defined as force times perpendicular distance from axis of rotation to the point at which force is applied. Torque is denoted by τ and its SI unit is Nm. i.e Torque is given by, τ = F×d sinθ. Torque is vector quantity.

Torque is analogous to force in rotational motion. like there angular velocity ω is analogous  linear velocity v. means Torque is a force in rotational motion.

Looking at the answered figure I have resolved forces, there will be no resultant rotation when opposite torques due to opposite horizontal forces gets balanced.

We get,

τ₁ = τ₂

F×d Cos40⁰ = W×d Sin55°

F Cos40° = W Sin55°

W = F×(Cos40°÷Sin55°)

W = F×0.93516

W = 7800 ×0.93516

W = 7294.3 N

Hence Weight that can be supported is 7294.3 N.

b) When we assume that there is no cable, Then

Torque τ = W×d Sin35°

τ = 7294.3×10 Sin35°

τ = 41838.3 Nm

bloom will rotate with 41838.3 Nm torque.

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The pith balls are having same charge and that is why they are held apart by the force of repulsion. When they both touched by the experimenter's finger they both gets attracted to the finger and comes in contact as in B.

Electrostatic force between two charges are arise when the charged bodies comes in contact. There are both force of attraction and repulsion. The electrostatic force of attraction results from the two unlike charges and the force of repulsion arise between two like charges.

Here, the pith balls are charged alike, hence they will get repelled. Ig they are negatively charged, the electrons will flow from them to the other body in touch.

When the experimenter touch his finger on the charged ball, the finger gets polarized and attracted to the ball , they gets in contact as in figure B.

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The velocity of Missy, given that she has a kinetic energy of 13700 J and a mass of 55 Kg is 22.32 m/s

Kinetic energy is defined mathematically as

KE = ½mv²

Where

The following data were obtained from the question:

The velocity of missy can be obtained as follow:

KE = ½mv²

13700 = ½ × 55 × v²

13700 = 27.5 × v²

Divide both side by 27.5

v² = 13700 / 27.5

Take the square root of both side

v = √(13700 / 27.5)

v = 22.32 m/s

Thus, the velocity is 22.32 m/s

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The words that fill the blanks are;

increases

decreases

Force and acceleration are directly proportional to each other, according to Newton's second law of motion. The law states that the acceleration of an object is directly proportional to the force applied to it, and inversely proportional to its mass. Mathematically, this can be expressed as:

F = ma

where F is the force applied to an object, m is its mass, and a is its resulting acceleration.

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Cory's displacement vector has a magnitude of 4.62 km, which is the closest to the 4.6 km value.

The length of the arrow is a symbol for the displacement vector's magnitude, which represents the distance between the locations. The arrow's direction corresponds to the displacement vector's direction.

d = 3 m + 5 m + 6 m = 14 m is the total distance travelled. Visualizing the walking makes it possible to determine the displacement's size. The real distance between A and B is 3 metres, followed by 5 metres from B to D and 6 metres from D to E. |S| =√92+52 = 10.29 m.

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Well to be honest i probably could answer this if I had the thing to look at to solve it but if not i saw try lucky C. although that doesn't seem like the answer to be honest, either A. or B. seem like reasonable answers to Since D. Does not make sense for this specific question stated, inches for Celsius? Seems a bit off. I say maybe 1. or b. But if your daring choose D. It is really up to you to decide, After all I really do not have anything to base this off of.

The amount of resistance that each resistor has, in this closed circuit, given the batteries is 3 ohms.

In a closed circuit, the total resistance (R_total) is equal to the sum of the individual resistances. We can use Ohm's law to solve for the resistance of each resistor:

Resistance (R) = Voltage (V) / Current (I)

Using Ohm's law, we can solve for the total resistance (R_total) of the circuit:

= V_total / I

= 18V / 2A

= 9 ohms

Since there are three identical resistors in the circuit, we can divide the total resistance by 3 to find the resistance of each resistor:

= 9 / 3

= 3 ohms

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The angle formed by cables AB and AC is approximately 72.4 degrees.

b^2 = a^2 + c^2 - 2ac cos A

Since the tower height is given as a = 58m, we can substitute this into the equation:

b^2 = 58^2 + c^2 - 2(58)(c) cos A

Simplifying, we get:

cos A = (c^2 + 58^2 - b^2) / (258c)

Now we can plug in the values given in the problem. Let's say cable AB has a length of 70m and cable AC has a length of 80m. Then we have:

cos A = (80^2 + 58^2 - 70^2) / (25880)

cos A = 0.292

Taking the inverse cosine of this value, we get:

A = 72.4 degrees

A cable is a flexible structure made of one or more long, thin, and strong wires or fibers. Cables are used to transmit forces, motion, or electricity between two points. They are widely used in engineering, construction, transportation, and power generation.

The strength and flexibility of cables depending on the material and structure used in their construction. Steel cables are commonly used for their strength and durability, while synthetic fibers such as nylon and kevlar are used for their flexibility and resistance to corrosion.

Cables are often used in tension, meaning that they are stretched between two points and used to transmit a pulling force. They can also be used in compression, where they are used to resist a pushing force.

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Answer:

PE = 2450 Joules

KE = Assuming the child is at rest (not moving or accelerating), there is no Kinetic Energy

Explanation:

PE = potential energy

m = mass

g = gravity

h = height

PE = mgh

m = 25 kg

h = 10 m

g = 9.8 (when on Earth, gravity is always this number with more or less decimals)

[tex]PE = (25)(9.8)(10)=2450J[/tex]

Answer:

Explanation:

Greetings!!!

Mass(m)= 1900kg

Acceleration (a)= 6.0m/s²

Force (F)= ?

Firstly, recall Newton's second law.

Substitute known variables into the equation

Solve for Force

If you have any questions tag me on comments

Hope it helps!!!

The frequency of a wave is the speed of the wave divided by its wavelength. The frequency of the wave travelling through at 2.6 m/s with the wavelength of 1.3 meters is 2 Hz.

Frequency of a wave is the number of wave cycles travelling per unit time. It is the inverse of the time period thus has the unit of s⁻¹ which is equivalent to the unit Hz.

The frequency of a wave is inversely proportional to the wavelength of the wave. The speed of the wave is related to its frequency and wavelength as:

c = νλ

given, c = 2.6 m/s

wavelength, λ = 1.3 m.

then, frequency ν = c/λ

ν  = 2.6 m/s / 1.3 m

   = 2 Hz.

Therefore, the frequency of the wave is 2 Hz.

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Assuming the car is driving across a flat road with no air resistance, the direction of net force acting on the car will depend on the direction of the car's motion and the forces acting on it.

If the car is traveling at a constant velocity, then the net force acting on it is zero. This is because the forces acting on the car - such as the force of the engine, friction from the tires, and air resistance - are balanced and cancel each other out. However, if the car is accelerating or decelerating, then there is a net force acting on it. For example, if the car is accelerating forward, then the net force acting on it is in the forward direction. This is because the force of the engine pushing the car forward is greater than the opposing forces, such as air resistance and friction. Similarly, if the car is decelerating, then the net force acting on it is in the opposite direction of its motion. This is because the opposing forces are greater than the force of the engine, causing the car to slow down.

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The refractive index of the crown glass block can be calculated using Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the velocities in the two media.

Refraction is the bending of light that occurs when it passes through a medium. It occurs when light moves from one medium to another and is caused by the change in the speed of light as it passes through different mediums. When light passes through a medium, the light waves are bent and the angle of the wave changes. This wave bending is what causes the phenomenon of refraction.

In this case, the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the velocities in the two media, which is the refractive index of the crown glass block.

The refractive index of the crown glass block is calculated as follows:

Refractive index = Sin(49°) / Sin (28.1°)

Refractive index = 1.75

Therefore, the refractive index of the crown glass block is 1.75.

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A weight lifter does 1700.44 Joules of work to lift the barbell from the floor to a height of 9.90 meters.

To calculate the work done by the weightlifter, we need to use the formula:

Work = force x distance x cos(theta)

where force is the weight of the barbell, distance is the height it is lifted, and theta is the angle between the force and the direction of motion. Since the weightlifter is lifting the barbell straight up, theta is 0 degrees and cos(theta) is 1.

So, we have:

Work = 171.60 N x 9.90 m x 1

Work = 1700.44 Joules

Therefore, the weightlifter does 1700.44 Joules of work to lift the barbell from the floor to a height of 9.90 meters.

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The lines of iron fillings will be attracted towards the poles of the magnet on the paper. The fillings gets sticked on the magnet. The glass or plastic will stop the passage of the magnetic lines of force .

Magnetic field lines are lines of force generated by a strong magnetic field. For a bar magnet, the magnetic south pole and north pole are having stronger magnetic fields than the middle part.

When magnetically susceptible materials comes in contact with a magnet they gets attracted to the poles of the magnet. The fields lines of the material gets aligned parallel to the applied field.

Some materials such as paper and glass are not showing magnetic properties. Hence, they can stop the passage of magnetic field lines. If we place a glass or paper in between the poles of a two magnets, they will stick to the glass from both ends due to the attraction to the opposite pole.

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ΔU = mgh is the expression to Gravitational Potential Energy for Height (h).

A book on even a high shelf, for instance, has more energy potential than a book here on bottom shelf since it requires a longer distance to fall. Items having gravitational potential energy can also include the following: a heavier burden. water retentive to a dam.

The energy held within an item as a result of its height above the ground is known as gravitational potential energy. The object's height, gravitational acceleration caused by the Earth, and mass all play a role in this. The energy an item possesses as a result of its motion is known as kinetic energy.

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Answer:

A. A force can be a push or pull

D. A force can have mass or weight

Answer:

C.

Explanation:

c. the source is written by the person who conducted the experiment. A primary source is an original piece of information created at the time under study. It can be a diary, a letter, a photograph, a recording, or any other type of artifact. It provides firsthand information about an event or topic, and is created by a person who was directly involved or witnessed it.

Answer:

Density of iron = 7.87 g/cm^3

Explanation:

Answer:

17.0 kg

Explanation:

The kinetic energy (KE) of the system can be expressed as:

KE = (1/2)mv^2

where m is the mass of the cart and student combined, and v is the velocity of the cart.

We know that KE = 4896 J and v = 12 m/s. We can rearrange the equation to solve for m:

m = 2KE/v^2

m = 2(4896 J) / (12 m/s)^2

m = 17.0 kg

Therefore, the mass of the student and cart combined is 17.0 kg.

There is a requirement for 1,638,000 Joules of heat.

Q=I2Rt provides the Joule's heating formula. Joule's heating formula states that the amount of heat produced is proportional to the length of time that the electrical resistance and current are both constant.

The following equation must be used:

Q = m × Lfus + m × Cp × ΔT

Ethyl alcohol has a heat of fusion of 105 J/g and a specific heat capacity of 2.44 J/g°C.

The amount of ethyl alcohol is specified as 7.2 kg, or 7,200 g.

The ethyl alcohol must be melted at a temperature of:

Q1 = m × Lfus =

7,200 g × 105 J/g

= 756,000 J

In order to raise the temperature of the liquid ethyl alcohol from 0°C to 50°C, we must determine the amount of heat needed:

ΔT = 50°C - 0°C

= 50°C

The amount of heat required to raise the temperature of the liquid ethyl alcohol is:

Q2 = m × Cp × ΔT

= 7,200 g × 2.44 J/g°C × 50°C

= 882,000 J

As a result, the total amount of heat needed to transform 7.2 kg of solid ethyl alcohol from -211°C to 50.0°C into a liquid is:

Q = Q1 + Q2 = 756,000 J + 882,000 J

= 1,638,000 J

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Answer:

Explanation:

Given :-

Solution :-

Frequency of a wave is given by :

where,

On substituting the values we get :

[tex]\dashrightarrow \sf F = \dfrac{240}{0.20} \\ \\ \dashrightarrow \rm F = 1200 \: Hz \\[/tex]

Answer:

The speed of a wave (v) is equal to the product of its wavelength (λ) and frequency (f), i.e., v = λf. Rearranging this equation, we get:

λ = v/f

Substituting the given values, we get:

λ = 2.3 m/s / 5 Hz

λ = 0.46 meters

Therefore, the wavelength of the water wave is 0.46 meters.

Explanation:

Answer:

The wavelength is 0.46 meters.

Explanation:

The speed of a wave is given by the formula:

v = λf

where v is the wave speed, λ is the wavelength, and f is the frequency.

We are given v = 2.3 m/s and f = 5 Hz. Rearranging the formula above to solve for λ, we get:

λ = v/f

Substituting the given values, we get:

λ = 2.3 m/s / 5 Hz = 0.46 m

Therefore, the wavelength of the water wave is 0.46 meters.