which statement is wrong concerning luminosity? it is apparent brightness a star appears in night sky. it measures total power radiated by a star. it is also called absolute brightness.

Answer:

\(a=12.5\ m/s^2\)

Explanation:

Given that,

The speed of the bucket tied to a rope, v = 5 m/s

The radius of the circle, r =2 m

We need to find the magnitude of the centripetal acceleration of the bucket. The formula for the centripetal acceleration is given by :

\(a=\dfrac{v^2}{r}\\\\a=\dfrac{(5)^2}{2}\\\\a=12.5\ m/s^2\)

So, the centripetal acceleration of the bucket is \(12.5\ m/s^2\).

2.4N is the magnitude of the tension T in the string

Define tension force.

It is also possible to refer to tension as the action-reaction pair of forces acting at each end of the aforementioned elements. Tension is defined as the pulling force transmitted axially by a string, rope, chain, or other similar object, or by each end of a rod, truss member, or other comparable three-dimensional object.

When an object is compressed or stretched, spring forces come into play. The degree of compression or stretching has a direct relationship to the force a spring produces. In other words, the force a spring produces increases with the amount it is compressed or stretched.

T=Mgsin30−Ff +mg

T=(0.5)(9.8)sin30−1.5+(0.15)(9.8)

T=2.4 N

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Complete question:

A 500g trolly is placed on a runway that is tilted so that it makes an angle of 30 degrees to a horizontal table.A light inextensible string is attached to 150g mass piece.the trolly accelerates down the slope as a result of the force applied by the hanging mass piece.the frictional force between the trolly and the runway is 1.5N, what is the magnitude of the tension T in the string?

(a) The equation derived from energy considerations is

5v² = 318x - 5x² - 2420.

(b) To ensure the validity of the equation, x must be greater than 22 meters.

(c) The maximum value of x, when the cord is fully stretched, is approximately 4.45 meters.

(d) (i) At x = 31.8 meters, the speed of the bungee jumper is maximized according to the derived equation.

(d) (ii) The maximum speed of the bungee jumper is approximately 25.2 m/s, obtained from the equation and analysis of energy conservation.

(a) By considering energy, we can analyze the motion of the bungee jumper. Initially, the bungee jumper is at a height of 60 meters above the ground.

As the jumper falls, the elastic cord stretches and exerts an upward force on the jumper due to Hooke's Law.

The total energy of the system is conserved, and it can be divided into two components:

At the top of the fall (x = 0), all the energy is in the form of GPE:

        GPE = mgh (Gravitational potential energy)

When the bungee jumper has fallen x meters, his speed is vm m/s.

At this point, his potential energy has been converted into kinetic energy (KE) and elastic potential energy:

           KE = (1/2)mv² (Kinetic energy)

          EPE = (1/2)kx² (Elastic potential energy)

Since air resistance is negligible, the total energy remains constant:

           GPE + EPE = KE

          49 * 9.8 * 60 + (1/2)(1078)x² = (1/2) * 49 * v²

Substituting the given values:

          5v² + 318x - 5x² = 2420

(b) The equation in part (a) is derived under the assumption that the cord is taut and stretched.

(c) To find the maximum value of x, we need to determine the point at which the bungee cord reaches its maximum stretch.

              kx = mg

         1078x = 49 * 9.8

                 x = (49 * 9.8) / 1078

                 x ≈ 4.45 meters

(d) (i) To find the speed of the bungee jumper when it is at a maximum, we can differentiate the equation derived in part (a) with respect to x and set it equal to zero to find the maximum point.

Differentiating the equation:

     d(5v² + 318x - 5x²) / dx = 0

                            318 - 10x = 0

                                    10x = 318

                                        x = 31.8 meters

(ii) Now that we have the value of x at the maximum speed, we can substitute it back into the equation to find the maximum speed (vm):

       5v² + 318(31.8) - 5(31.8)² = 2420

       5v² ≈ 3178.4

         v² ≈ 635.68

        v ≈ √(635.68)

        v ≈ 25.2 m/s

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it will avoid the sun rays from penetrating into the glass to make it hot,and even fall on the seat and burn

Explanation:

Because of the type of metal it was made with

Answer:

The car gets hot in the photograph because of greenhouse effect. Most noticeably the fact that the sunlight enters the car through the windows to heat up the inside surfaces, which then gets trapped inside the car, causing a buildup of temperature.

Sunscreen can help keep the car cool by reflecting the sunlight, which in turn reduces the amount of heat that enters the car. This also decreases the inside surfaces to the exposure of UV lights.

The direction of this current's magnetic force on an electron that is moving perpendicular to the page and outward from it on the left side of the wire is downward.

What is Magnetic force?

The force exerted by a magnetic field on a moving charged particle is known as a magnetic force. It is described by the formula F = q(v x B), where F is the magnetic force, q is the particle's charge, v is the particle's velocity, and B is the magnetic field.

The right-hand rule states that when a wire-carrying current is held in the right hand with the thumb pointing in the direction of the current, the fingers will curl in the direction of the magnetic field lines created by the current.

The magnetic field lines will create clockwise circles around the wire because, in this instance, the current flows from the top of the page downward.

Now imagine an electron on the left side of the wire traveling perpendicular to the page. The electron will experience a magnetic force since it travels in a direction perpendicular to both the magnetic field and the current.

We can use the left-hand rule for a negative charge to determine the direction of this force. If the left hand is held with the fingers pointing toward the magnetic field and the thumb pointing toward the electron's velocity, the palm will face the order of the force on the electron.

The thumb points to the left because the electron leaves to the left. The fingers curl because the magnetic field lines go clockwise around the wire. Therefore, the magnetic force acting on the electron is directed downward because the palm is facing downward.

Therefore, the magnetic pull exerted by this current on an electron traveling outward and perpendicular to the page on the wire's left side is directed downward.

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Answer:

What do you need help with?

Answer:

a.) Total Momentum = 121 Kg•m/s

b.) Momentum of Azad = 94.5 Kg•m/s

c.) Momentum of Bike = 26.5 Kg•m/s

Explanation:

Now,

Mass of Azad = 21 Kg

Velocity = 4.5 m/s

P = 21 Kg × 4.5 m/s

P = 94.5 Kg•m/s

Mass of bike = 5.9 Kg

Velocity = 4.5 m/s

P = 5.9 Kg × 4.5 m/s

P = 26.5 Kg•m/s

Total Momentum = Momentum of Azad + Momentum of Bike

Total Momentum = 94.5 + 26.5 = 121 Kg•m/s

-TheUnknownScientist 72

Answer:

The concept of potential energy, often referred to as energy of position, is very simple: As the coaster gets higher in the air, gravity can pull it down a greater distance. ... The potential energy you build going up the hill can be released as kinetic energy — the energy of motion that takes you down the hill.

Potential energy, also known as energy of position, is a pretty straightforward idea. As the roller coaster rises in the air, gravity has a greater ability to pull it down.

An easy illustration involves a stopped car at the summit of a hill. The car drives faster as it goes down the hill, which results in an increase in kinetic energy and a decrease in potential energy. The vehicle changes kinetic energy into potential energy as it ascends the hill.

They are higher up at the top of the hill, thus they have more potential energy. Moving down a slope transforms potential energy into kinetic energy, while moving up a hill transforms kinetic energy into potential energy.

Therefore, You can release the potential energy you accumulate while climbing a hill as kinetic energy, which is the energy of motion that propels you down the hill.

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Answer:

The second law: When a force is applied to a car, the change in motion is proportional to the force divided by the mass of the car. This law is expressed by the famous equation F = ma, where F is a force, m is the mass of the car, and a is the acceleration, or change in motion, of the car

Answer: "Surface tension is a film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area."

Hope this helps!

Answer:

Explanation:

Surface tension is the property of a liquid surface. It is an effect where the surface of the liquid is strong.

example - small insects can walk on water as they do not have enough weight to penetrate it.

This image might help you

Hope it helps

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Answer:

30.5mm

Explanation:

There are 300 pages, so to find the number of pages we do 0.1mm*300 to get 30mm. There are two covers in the book (the front and the back). 0.25mm*2 = 0.5mm. To determine the total thickness of the book we do 30mm+0.5mm to get a total of 30.5mm

Your answer is 30.5mm.

Answer:

15.5mm

Explanation:

there are 150 pages(one page has 2 sides so 300/2 = 150) and 2 covers

page's thickness is 0.1mm, cover's thickness is 0.25

so books thickness = 150*0.1+0.25*2 = 15.5mm

In thermodynamics, heat refers to the transfer of energy from a set of particles with higher temperature to another set of particles with lower temperature. This transfer can occur through various methods such as conduction, convection, and radiation.

In thermodynamics, heat is defined as B) The transfer of energy from a set of particles with higher temperature to another. Heat is a form of energy transfer that occurs due to a temperature difference between two systems or objects, and it always flows from the system with a higher temperature to the one with a lower temperature.

                                                It is important to note that heat is a form of energy and not a substance, and it can be quantified and measured in terms of joules or calories. The amount of heat transferred is dependent on factors such as the temperature difference between the two sets of particles, the time over which the transfer occurs, and the nature of the material through which the heat is transferred.

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Answer:

11.3

Explanation:

The bridge increase at 70C is  7.7*\(10^{-11}\)  m.  when Golden Gate Bridge  longer (in meters) would the bridge be for an increase of 70C.

With a diameter of little over three feet, 7,659 feet in length, and 27,572 parallel wires, each of the two major cables is composed. The Golden Gate employs the world's longest bridge cables, which at the equator could circle the globe more than three times.

To cross the Golden Gate Bridge, how long does it take? Walking each direction takes roughly 35 minutes because the bridge is 1.7 miles long.

Change of Length: ΔL= aΔT

[remember that the product of ΔL must then be multiplied by the length of the steel bridge (1.3K)]

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Power is defined as the amount of energy used in a given amount of time. It is measured in watts (W) and is equal to the product of force and velocity. Therefore, to calculate the power required to keep the object in motion, we need to calculate the force required and the velocity at which the object is traveling.

Hence, the power required to keep the object in motion is 500 watt.

The power required to keep the object in motion can be determined using the formula:

Power = Force × Velocity

Given:

Force = Weight = 100 N (weight is the force due to gravity acting on the object)

Velocity = 5 m/s

Substituting these values into the formula, we have:

Power = 100 N × 5 m/s

Power= 500 Watts

Therefore, the power required to keep the object in motion is 500 Watts.

Substituting the values we get,

P = 100 N × 5 m/s

= 500 W.

Hence, the power required to keep the object in motion is 500 watt.

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The fastest rollercoaster in the world is the formula rossa in abu dhabi, united arab emirates, speed of this is 240 km/h (149.1 mph)

The rate at which an object's distance traveled changes is measured by its speed. In terms of measurement, speed is a scalar, meaning it has magnitude but no direction. Speed is the rate at which an object moves over a given distance. a thing that travels at a high rate of speed and covers a lot of distance quickly. A slow-moving object, on the other hand, travels a comparatively short distance in the same amount of time when moving at a low speed. An object with zero speed is completely immobile.

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Answer:

I say that the answer is D all of the above hope this helps ‍♂️

Answer:

The answers to your questions are given below

Explanation:

A. Definition of momentum.

Momentum of an object can be defined as the product of the mass of the object and its velocity. Mathematically, it expreessed as:

Momentum = mass x Velocity

From the above equation, we can derive the SI unit of momentum as follow:

Mass is measured in Kilogram (Kg)

Velocity is measured in meter per second (ms¯¹).

Momentum = mass x Velocity

Momentum = Kg x ms¯¹

Momentum = Kg•ms¯¹

Therefore, the SI unit of momentum is Kg•ms¯¹.

Bi. Determination of the force of the body from O to A.

Mass (m) = 5 kg

Velocity (v) = 40 ms¯¹

Time (t) = 2 secs.

Force (F) =?

Next, we shall determine the acceleration of the body.

Acceleration (a) = Velocity (v) /Time (t)

a = v /t

Velocity (v) = 40 ms¯¹

Time (t) = 2 secs.

Acceleration (a) =.?

a = v/t

a = 40/2

a = 20 ms¯²

Now, we can obtain the force as follow:

Mass (m) = 5 kg

Acceleration (a) = 20 ms¯²

Force (F) =?

Force (F) = mass (m) x Acceleration (a)

F = ma

F = 5 x 20

F = 100 N

Therefore, the force of the body from O to A is 100 N.

Bii. Determination of the force of the body from B to C.

Mass (m) = 5 kg

Velocity (v) = 40 ms¯¹

Time (t) = 10 – 6 = 4 secs.

Force (F) =?

Next, we shall determine the acceleration of the body.

Acceleration (a) = Velocity (v) /Time (t)

a = v /t

Velocity (v) = 40 ms¯¹

Time (t) = 4 secs.

Acceleration (a) =.?

a = v/t

a = 40/4

a = 10 ms¯²

Now, we can obtain the force as follow:

Mass (m) = 5 kg

Acceleration (a) = 10 ms¯²

Force (F) =?

Force (F) = mass (m) x Acceleration (a)

F = ma

F = 5 x 10

F = 50 N

Therefore, the force of the body from B to C is 50 N.

Answer

the answer is 6.25

Explanation:

Here, the mass of the stone (m) = 0.5 kg, velocity at which it is thrown (v) = 5 m/s, The kinetic energy of the stone (KE) =? We have, Kinetic energy of the stone (KE) = \ (\frac12mv^21) = \(\frac120.5\times5^2\) = 6.25 Joules Hence, the kinetic energy of the stone (KE) is 6.25 joules. Hope it will be helpful

Answer:

1. Following the recoil principle, rockets use combustion (a controlled explosion) to work against earth's gravitational attraction.

2. A force is a push or a pull that acts upon an object as a results of its interaction with another object. ... These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.

(via physicsclassroom.com)

3. The combustion throws out material with very high momentum and is, physically speaking, the action. In reaction to that that, the rocket moves away from it (upward when in starts and has the action underneath it)

4. To show the world that commercial manned space missions are safely possible. Some may also like the fact that the US can now do, or rather order, manned flights into space without the help of the russian space agency (Roskosmos).

5. Robert Behnken and Douglas Hurley

6. The international space station (ISS)

7. Yes, Stage 1 of the rocket landed on the drone ship. The crew opened the hatch to enter the space station after 21 hours and 39 minutes after the launch from Cape Canaveral.

8. To have private contractors such as SpaceX actively in the field, there are now more interest groups that participate in space travel. And they can interact with other companies as well.

Also, due to Musks dream and efforts of SpaceX, space travel seems to get a lot cheaper.

That might indeed open the way back to the moon and further to the Mars for human space flight.

Governments such as the US planned on such things for decades, but changed plans ever since, and routinely changed leadership and the opinion on what's important.

Now Spaceflights can become less politically motivated and more commercially. That seems to be a more stable way over long periods of time.

(wrote most of it for you myself, even tough I'm not a native English speaker. would really appreciate the brainliest if you appreciate the work)

Answer:

yhgfty

Explanation:

cdfgv

Answer:

e.g. means "for example" but is physics is also stands for gravitational potential energy

Answer:

4.

Explanation:

the paths and velocities of Earth and the asteroid would bring them closer and closer anyway, so their distance decreases, and so the gravity effect gets stronger and stronger.

what that answer ignores: also a steady pull (or push) by a force leads to acceleration.

in this case the force itself gets in addition even stronger and stronger due to the decreasing distance.

Answer:

1.69 T

Explanation:

Applying,

F = BvqsinФ.................. Equation 1

Where F = Force, B = magnetic field, v = velocity, q = charge on an electron, Ф = angle between the electron and the field.

make B the subject of the equation,

B = F/(vqsinФ)............. Equation 2

From the question,

Given: F = 2.0×10⁻¹³ N, v = 7.4×10⁵ m/s, Ф = 90°

Constant: q = 1.60×10⁻¹⁹ C

Substitute into equation 2

B =  2.0×10⁻¹³/(7.4×10⁵×1.60×10⁻¹⁹×sin90°)

B = 0.169×10

B = 1.69 T

A. Decreased shell formation. pH is a measure of the acidity or basicity (alkalinity) of a solution. It is defined as the negative logarithm of the concentration of hydrogen ions (H+) in the solution.

A decrease in shell formation in marine organisms, such as corals and mollusks, can lead to an increase in carbon dioxide levels in the oceans. This is because these organisms help remove carbon dioxide from the water during shell formation, which helps to regulate the pH of the oceans. Without them, there will be an excess of carbon dioxide, leading to a decrease in pH levels, or ocean acidification. This process can have significant impacts on marine ecosystems and the organisms that depend on them.

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An object which starts from its resting place & accelerates at a speed of 4 rad/sec², the angular displacement is 8 rad.

An object's angular displacement is described in the following:

Angle displacement is equal to θ\(f\)-θ\(i\).

The following methodology must also be applied to determine angular displacement when the object's acceleration, starting velocity, and time are known:

θ=ωt+ 1/2αt²

[where θ= the angular displacement of an object,

ω= initial angular velocity,

α= angular acceleration,

t= time]

In this case, the object starts from the rest position.

So, the initial angular speed, ω= 0 rad/sec

Provided angular acceleration ,α = 4 rad/sec²

Time ,t= 4 sec

So, θ= \(0*4+ (1/2)*4*4\)

⇒θ= 0+ 8

⇒θ= 8 rad

Therefore, it is concluded that the angular displacement is 8 rad.

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Answer:

1. The tightness of the wire has no effect on the strength of the electromagnet

2. The strength increases with the number of coils

3. The strength of the electromagnet increases with the number of dry cells used

4. The strength of the electromagnet increases with the wideness of the nail but not the length of the nail

Explanation:

The strength of an electromagnet is given by the following relation;

\(B = \dfrac{\mu_0 \cdot K \cdot N \cdot I}{L}\)

Where;

B = The magnetic field strength at the center

μ₀ = The magnetic permeability of free space = 4·π × 10⁻⁷ N·A⁻²

N = The number of loops formed by the conductor around the core

I = The current flowing through wire coiled around the nail

K = The magnetic permeability of the nail

L = The length of the coil

Therefore, we have;

1. From the above equation, the tightness of the wire coil around the nail (or the radius, 'R', of the wire) does not does not affect the magnetic field strength

2. The number of coils, 'N', is directly related to the magnetic field strength, 'B', and therefore, increasing the number of turns or coils around the nail, increases the magnetic field strength

3. The current in the circuit is directly related to the magnetic field strength and the number of dry cell used increases the current in the circuit and therefore, can increase the magnetic field strength

4. The size of the nail used in a solenoid and the magnetic field strength are directly related. The wider the nail, the stronger the magnetic field

In order for an object to have a perfectly circular orbit, an object must have the exact speed to achieve the circular orbit.

A circular orbit is a circular path which an object continuously follow in the course of its movement.

The earth and planets have a circular orbit around the sun.

The circular orbit is maintained by a balance between centripetal and centrifugal forces.

Therefore, in order for an object to have a perfectly circular orbit, an object must have the exact speed to achieve the circular orbit.

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