A man stands on a platform that is rotating (without friction) with an angular speed of 1.5 rev/s; his arms are outreached and he holds a weight in each hand. The rotational inertia of the system of man, weights, and platform about the central axis is 16.00 kg m2. If by moving the weights the man decreases the rotational inertia of the system to 10.88 kg m2, what is the resulting angular speed of the platform

When a fan is switched on, it achieves an angular acceleration of 250 rad/s2. after 1.2 s, the angular velocity in revolutions per minute would be 1989 rev/minute.

The total displacement covered by any object per unit of time is known as velocity. The velocity of an object depends on the magnitude as well as the direction of the object.

velocity = total displacement /time

As given in the problem When a fan is switched on, it achieves an angular acceleration of 250 rad/s2. after 1.2 s,

By using the equation of motion for the rotational motion,

α = ω₀ + ωt

250 = 1.2 ω

ω = 250/1.2

   = 208.33 rad/s

2π radian = 1 revolution

1 radian = 1/2π revolution

208.33 rad = 208.33 /2π revolution

                   =33.15 revolution

The number of revolutions in one minute = 33.15 ×60

                                                                =1989

Thus, the angular velocity comes out to be 1989 rev/minute.

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Answer:

The answer is A

Explanation: i took k12

ANSWER- I GUESS IT SHOULD BE GRAVITATIONAL FORCE.......

Answer:

GRAVITATIONAL FORCE

Answer: Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.

Explanation:

Answer:

7.5 m/s2

Explanation:

F = ma

300 = 40 kg (a)

divide both sides by 40 to single out the variable a (acceleration)

300/40 = 7.5 m/s2

The value of the point charge is zero.

What do you mean by charge?

Charge, also known as electric charge, electrical charge, or electrostatic charge and denoted by the symbol q, is a property of a unit of matter that indicates how many more or fewer electrons than protons it contains.

When a subatomic particle is exposed to an electric and magnetic field, its electric charge causes it to feel a force. There are two sorts of electric charges: positive and negative. The electric field outside the sphere is the same as the field from a point charge with a net charge of Q, according to Gauss' law, whereas the electric field inside the sphere is zero. For a solid or hollow sphere, this conclusion holds valid.

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Answer:

The resultant velocity is 86.1 mi/h.    

Explanation:

The law of cosines is given by:

\( c^{2} = a^{2} + b^{2} - 2abcos(\theta) \)

Where:

c: is the resultant velocity =?

a: is the velocity of the plane = 75.0 mi/h

b: is the velocity of the wind = 15.0 mi/h  

θ: is the angle between "a" and "b"                          

The angle between "a" and "b" can be found as follows:

\( \theta = 180.0 - 46.0 = 134.0 ^{\circ} \)

Now, by using the law of cosines we have:

\( c^{2} = (75.0)^{2} + (15.0)^{2} - 2*75.0*15.0*cos(134.0) = 7413.0 \)

\( c = 86.1 mi/h \)    

Therefore, the resultant velocity is 86.1 mi/h.    

The law of sines is:

\( \frac{a}{sin(\gamma)} = \frac{b}{sin(\alpha)} = \frac{c}{sin(\theta)} \)

Where:

γ: is the angle between "b" and "c"

α: is the angle between "a" and "c"

So, if we want to find "c" by using the law of sines, we need to know another angle besides θ (γ or α), and the statement does not give us.

I hope it helps you!        

Reinforcement can be positive, meaning that a desirable consequence is provided, or negative, meaning that an undesirable consequence is removed

Reinforcement in psychology is an important tool for motivating behavior. It works by providing a consequence after a behavior occurs that makes it more likely to happen again in similar situations. Positive reinforcement is providing a desirable consequence, such as praise or a reward, after a behavior. Negative reinforcement is the removal of an undesirable consequence, such as a punishment, after a behavior. Reinforcement can be used to shape and strengthen desirable behaviors, as well as decrease undesirable behaviors. It is an effective way of motivating people and can be used in a variety of different contexts.

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Answer:

75% is the efficency of this maxhine

As the south pole leaves the loop of wire, the induced current (as viewed from above) will be in the clockwise direction. 

Whenever a magnet is moved near a closed circuit or wire loop, an emf (electromotive force) is generated in the conductor. When the magnet moves in and out of the coil or loop, the magnitude and direction of this voltage changes, generating an induced current. This is referred to as Faraday's law of electromagnetic induction, which states that an emf is induced in a closed conductor when the magnetic flux through the surface enclosed by the conductor changes over time.

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Answer:

An image is formed on the retina with light rays converging most at the cornea and upon entering and exiting the lens. Rays from the top and bottom of the object are traced and produce an inverted real image on the retina. The distance to the object is drawn smaller than scale

A fighter jet being launched from such an aircraft carrier using a steam-powered catapult and its own engines. Its engines produce 2.3 x 105 N of thrust.

What speed is reached when a jet fighter aircraft is fired from a slingshot on an aircraft carrier?

42 m/s On an aircraft carrier, a catapult is used to launch a jet fighter. Just at end of the sling, it takes 2 seconds to achieve velocity of 42 m/s. What is the catapult's length if the acceleration is constant?

How strong is the aircraft carrier's catapult?

Catapults A 48,000-pound aeroplane was launched 300 feet and increased in speed from 0 to 165 miles an hour in two seconds by four steam-powered catapults. On every

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This is a time dilation exercise. The time taken for the CD to last as measured by a clock on earth is given as: 67.08 minutes.

Under the theory of special relativity, time dilation is the "slowing down" of a clock as determined by an observer in relative motion with respect to that clock.

Recall that the equation for time dilation is given as:

t = t₀/√(1- (v²/c²)

Where:

t₀ is the observer in the space craft

t  is the observer on earth

v is the speed of the space craft which is given as 2 x 10⁸m/sec

c is the speed of light which is given as 3 x 10⁸m/sec

Hence

v/c = 2 x 10⁸/ 3 x 10⁸

= 2/3

Thus,

t = 5/√(1-(4/9)

= 50 √(9/5)

= 150/√5

= 150 /2.2361

= 67.08 min

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Answer:B

Explanation:

The mass of the scoreboard is 1313.7 kg.

To find the scoreboard's mass, we need to calculate the total force acting on the scoreboard and then use the equation F = ma to find the mass.

First, let's calculate the vertical component of the force from the six cables that make an angle of 8.0° with the vertical. The vertical component of the force is given by:

Fv = F * cosθ

Where F is the tension in each cable (1300.0 N) and θ is the angle between the cable and the vertical (8.0°).

Fv = 1300.0 * cos(8.0°)

Fv = 1289.1 N

The total vertical force from these six cables is:

Fv,total = 6 * 1289.1

Fv,total = 7734.6 N

Now, let's calculate the vertical component of the force from the four cables that make an angle of 10.0° with the vertical. The vertical component of the force is given by:

Fv = F * cosθ

Where F is the tension in each cable (1300.0 N) and θ is the angle between the cable and the vertical (10.0°).

Fv = 1300.0 * cos(10.0°)

Fv = 1284.8 N

The total vertical force from these four cables is:

Fv,total = 4 * 1284.8

Fv,total = 5139.2 N

The total vertical force acting on the scoreboard is the sum of the vertical forces from the six cables and the four cables:

Fv,total = 7734.6 + 5139.2

Fv,total = 12873.8 N

Now, we can use the equation F = ma to find the mass of the scoreboard. The acceleration due to gravity is 9.8 m/s^2:

F = ma

12873.8 = m * 9.8

m = 12873.8 / 9.8

m = 1313.7 kg

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Answer:

5000 W

Explanation:

you are technically correct, but the question is asking for units in Watts

Recall that Power rating is the energy per unit time

= Energy ÷ Time

= 300,000 ÷ 60

= 5000 j/s

but we are told that the unit is a single letter, and recall that joules/s = watts

hence

5000j/s = 5000 W

edit: typo. Missing a zero from answer

Debris collecting around pilings is most likely to create a boating hazard around river bridges.

The option (c) is the correct option.

Boating Hazards:

Dams, submerged items, freezing water, rapidly changing weather, sunstroke, and current are just a few of the dangers that boaters may encounter. It's not always easy to see these risks. These risks must be recognized by boaters, and they must always be prepared to prevent hazards.

Operator negligence is the most frequent reason for boating accidents, according to US Coast Guard (USCG) recreational boating statistics from 2019. Inattentiveness on the part of the operator can result in crashes, people falling overboard, and slip-and-fall incidents on board, all of which can result in life-threatening injuries.

The greatest places to find more about any potential local risks are marinas and local boaters. Check any nearby marine charts as well to learn about potential dangers and how to avoid them.

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Before the collision, the velocity of the orange marble is -2 m/s which is equal to the velocity of the blue marble.

The velocity of an object is the speed of the object in a specified direction.

The distance traveled by an object in a specified direction is known as the displacement of the object.

Hence velocity can be defined as the ratio of displacement and the time taken.

Velocity = displacement/time taken.

Considering the velocity of the two marbles;

Before the collision, the blue marble has an equal velocity as the orange marble but in an opposite direction. Taking the direction of the blue velocity as positive, the velocity of the orange marble will be equal to the velocity of the orange marble in a negative direction.

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Answer:

v = 150 m/s

Explanation:

Given that,

The acceleration of the ball, a = 10 m/s²

Time, t = 15 s

We need to find the increase in ball's velocity. When it is dropped its initial velocity is equal to 0. Let v be the velocity,

v = u+at

v = 0 +10(15)

v = 150 m/s

So, the ball's final velocity is 150 m/s.

The life expectancy of the given stars are:a) 0.2-solar mass, 0.01-solar luminosity red dwarf: 10 trillion yearsb) 3-solar mass, 30-solar luminosity star: 10 million yearsc) 10-solar mass, 1000-solar luminosity star: 10 million years.

The life expectancy of a star is determined by its mass and luminosity. The more massive and luminous the star is, the shorter its life expectancy is. Hence, using this information, we can estimate the life expectancy of the following stars:a) 0.2-solar mass, 0.01-solar luminosity red dwarfRed dwarfs are known to have the longest life expectancies among all types of stars. They can live for trillions of years.

Hence, a 0.2-solar mass, 0.01-solar luminosity red dwarf is expected to have a much longer life expectancy than the Sun. It could live for up to 10 trillion years or more.b) 3-solar mass, 30-solar luminosity starA 3-solar mass, 30-solar luminosity star is much more massive and luminous than the Sun. As a result, it will have a much shorter life expectancy than the Sun.

Based on its mass and luminosity, it is estimated to have a lifetime of around 10 million years.c) 10-solar mass, 1000-solar luminosity starA 10-solar mass, 1000-solar luminosity star is extremely massive and luminous. It will burn through its fuel much faster than the Sun, resulting in a much shorter life expectancy. Based on its mass and luminosity, it is estimated to have a lifetime of only around 10 million years as well.

Therefore, the life expectancy of the given stars are:a) 0.2-solar mass, 0.01-solar luminosity red dwarf: 10 trillion yearsb) 3-solar mass, 30-solar luminosity star: 10 million yearsc) 10-solar mass, 1000-solar luminosity star: 10 million years.

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Answer: a= ff+fh/m

Explanation: bc khan academy said it was d. a=ff +fh/m

Answer:

answer is

m= Ff-Fh/a

The observer (point H) must be positioned to the right of the person and to the left of the lamppost, to the left of the person and to the right of the lamppost, or behind the lamppost to see the person obstructed by it.

To determine the possible positions of the observer (point H) relative to the mirror showcase, we need to consider the given information about the position of the person and the lamppost.

If the person is to the left of the lamppost (point C) as seen in the window, then the observer (point H) must be positioned to the right of the person and to the left of the lamppost. This is because the mirror will reflect the image of the person to the right, and the observer must be positioned to the right of the reflected image to see it.

If the person is to the right of the lamppost (point C) as seen in the window, then the observer (point H) must be positioned to the left of the person and to the right of the lamppost. This is because the mirror will reflect the image of the person to the left, and the observer must be positioned to the left of the reflected image to see it.

If the lamppost (point C) obstructs the view of the person as seen in the window, then the observer (point H) must be positioned behind the lamppost, either to the left or to the right of it. This is because the mirror will not be able to reflect the image of the person due to the obstruction caused by the lamppost.

In summary, the possible positions of the observer (point H) relative to the mirror showcase are:

To the right of the person and to the left of the lamppost, to see the person to the left of the lamppost. To the left of the person and to the right of the lamppost, to see the person to the right of the lamppost. To the left or right of the lamppost, behind it, to see the obstruction of the person caused by the lamppost.

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Complete question:

Using the given information, determine the possible positions of the observer (point H) relative to the mirror showcase such that the following are observed:

1 - The person is to the left of the lamppost (point C) as seen in the window.

2 - The person is to the right of the lamppost (point C) as seen in the window.

3 - The lamppost (point C) obstructs the view of the person as seen in the window.

The speed of the wave of wavelength 0.21 m is 23.1 m/s. And the correct answer is 0A. 23.1 m/s.

The speed of a wave is calculated by multiplying the wavelength and the frequency of the wave.

To calculate the speed of the wave, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the speed of the wave is 23.1 m/s.

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Answer:

4:A battery with 15 loops or wire around the nail

Explanation:

More loops equals more force

A battery with \(15\) loops or wire around the nail have the stronger force.

So, option 4 is correct.

An electromagnet is a system that contains of a magnetic encircled by a coil that conducts an electric current to ionize the core.

Wherever controllable magnetism are required, such as in devices where the magnetic flux must be adjusted, reversed, or turned on and off, an electromagnet is utilized.

A battery with \(15\) loops or wire around the nail have the stronger force.

So, option 4 is correct.

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Answer:

we have to use the formula f=ma to find out the unknown force

Explanation:

mass = 9kg

accelration=3m/s^2

force = mass * acceleration

force = 9 * 3

force = 27 N(newton)

Answer:

Explanation:g

the mass of an object if it took 270 Joules of work to move it 15 meters is 1.83 Kg.

A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely considered to be tied to the amount of matter in a physical body. It was discovered that, despite having the same quantity of matter in theory, various atoms and elementary particles had varied masses. There are several conceptions of mass in contemporary physics that are theoretically different but practically equivalent. The resistance of the body to acceleration (change of velocity) in the presence of a net force may be measured experimentally as mass.[1] The gravitational pull an item has on other bodies is also influenced by its mass.

The kilogramme (kg) is the SI's fundamental unit of mass. The concept of mass differs throughout physics.

Given,

Work W = 270 joules

Displacement s = 15 m

Work = F.s

270 = F  × 15

F = 18 N

F = m*g

18 N = m*9.8

m = 1.83 Kg

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The angular displacement of the car tires during the 0.65-second acceleration period is 7.17 radians.

To find the angular displacement, follow these steps:

1. Calculate the final velocity: vf = vi + at, where vi = 14 m/s, a = 1.22 m/s², and t = 0.65 s.

2. Calculate the average velocity: v_avg = (vi + vf) / 2.

3. Find the linear displacement: d = v_avg * t.

4. Convert linear displacement to angular displacement: θ = d / r, where r = 0.33 m (converted from 33 cm).

so θ = 2.3661/0.33

=> 7.17 radians

By following these steps, we determine the angular displacement of the car tires during the period of acceleration.

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Answer:

The electrical energy consumed in boiling the water is 0.0788 kWh

Explanation:

Given;

mass of the water, m = 600 g = 0.6 kg

power rating of the kettle, P = 1500 W = 1.5 kW

specific heat capacity of water, c = 4,200 J/kg⁰C

density of water, = 1000 kg/m³

time taken to boil the water, t = 3 mins + 9 s = (3 x 60s) + 9 s = 180 s + 9 s = 189 s = \(189 \ s \times \frac{1 hr}{3.600 \ s} = 0.0525 \ hr\)

The electrical energy consumed in boiling the water is calculated as;

E = P x t

E = 1.5 kW  x 0.0525 hr

E = 0.0788 kWh

Therefore, the electrical energy consumed in boiling the water is 0.0788 kWh

When the core temperature rises, stars start burning helium to carbon. This rise in temperature is brought on by. creating helium by fusing hydrogen in a shell.

When carbon and helium are combined, oxygen is created. Helium burns to create carbon. The star's surface temperature rises as it develops into a horizontal branch star as its core becomes rich in carbon and oxygen nuclei. When their brilliance remains constant, stars with masses larger than or equal to the Sun shrink and get hotter.

When it becomes heated enough, hydrogen in a shell outside the core can begin to fuse. The exterior is expanding.

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Answer:

Sh = Vh t         horizontal distance traveled

Sh = 10.2 m/s * 3.7 s = 37.74 m