the yo-yo is released from rest and falls/unwinds for a distance of h [see fig (b)]. the string does not slip during the descent. what is the total kinetic energy of the yo-yo now?

Answer: 11

Explanation: In addition to nuclear reprocessing units at Sellafield and Urenco's Tails Management Facility (TMF) in Capenhurst, the UK has 11 active nuclear reactors in five locations (10 advanced gas-cooled reactors (AGR) and one pressurised water reactor (PWR)).

Please give brainliest or whatever brainlyest if this has helped :)

The tangental acceleration of the flywheel of  radius 2.12 cm with a final angular velocity of 1820 rev/min and an angular acceleration of 16.2 rad/s is 0.34 m/s².

This is the rate of change of tangental velocity of an object in circular motion.

To calculate the tangental acceleration, we use the formula below.

Formula:

Where:

From the question,

Given:

Subsitute these values into equation 1

Hence, The tangental acceleration of the flywheel of  radius 2.12 cm with a final angular velocity of 1820 rev/min and an angular acceleration of 16.2 rad/s is 0.34 m/s².

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Answer:

around 30 grays

Explanation:

Hope this helps :)

Answer: Wrong

Explanation:

The statement that accurately describes  the relationship between bond strength and the melting and boiling points of a substance is; "substances held together by ionic bonding have higher melting  and boiling points than those held together by hydrogen bonding."

Intermolecular forces refers to forces of attraction that holds molecules together in a particular state of matter. The nature and magnitude of intermolecular forces impacts on the magnitude of the melting and boiling points of substances.

Substances held together by ionic bonding have higher melting  and boiling points than those held together by hydrogen bonding. The bonds between ionic substances can only be broken at very high temperature.

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Answer:

The answer is (60 mph - 0 mph) / 8s = (26.8224 m/s - 0 m/s) / 8s = 3.3528 m/s 2 (meters per second squared) average acceleration. That would be 27,000 miles per hour squared.

Answer:

I HAD THE SAME QUESTION AND SEARCHED IT UP AND GOT THE ANSWERS.

Explanation:

Answer:

1.8 x 10⁴ kg m/s east

Explanation:

Answer:

the higher up an object is, the more potential energy it has

Explanation:

The surface temperature of Venus is significantly higher than the surface temperatures on Earth. Venus has an average surface temperature of about 462 degrees Celsius (864 degrees Fahrenheit), while Earth's average surface temperature is around 15 degrees Celsius (59 degrees Fahrenheit).

The extreme temperature on Venus is primarily due to its dense atmosphere and the greenhouse effect. Venus has a thick atmosphere composed mainly of carbon dioxide, which traps heat and creates a strong greenhouse effect. This results in a runaway greenhouse effect, causing the surface temperature to rise significantly.

The dense atmosphere prevents heat from escaping, leading to a severe greenhouse effect and a much higher surface temperature compared to Earth. The thick cloud cover on Venus also contributes to the heat retention, reflecting sunlight back to the surface and further increasing the temperature.

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The slope of a velocity-time graph gives the acceleration of the object.

A - The part A shows that there is no increase in the velocity of the object. That means the object is at rest.

B - In the part B of the graph, it is shown that the velocity of the object is increasing linearly. That means, the velocity is changing, thus the object has an acceleration in the positive direction.

C - In the part C of the graph, it is shown that there is no change in the velocity of the object, but it is moving with a non-zero velocity. Therefore, we can say that the object is moving with a constant speed.

D - In the part D of the graph, it is shown that the velocity of the object is decreasing linearly. That means the object is having a negative acceleration, but in the positive direction.

E - In the part E of the graph, it is shown that the velocity of the object is again increasing from zero, but in the opposite direction.

F - In the part C of the graph, it is shown that the object is moving with a constant velocity, but in the opposite direction.

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Answer:

can be called kinetic or potential energy

Explanation:

Answer:

Therefore, the magnitude of the acceleration of the particle at the instant when its velocity is zero is approximately 18.258 m/s².

Explanation:

To find the magnitude of acceleration at the instant when velocity is zero, we need to differentiate the given velocity equation with respect to time (t) to obtain the acceleration equation.

Given:

Velocity equation: v(t) = 22 - 3.8t^2

Differentiating the velocity equation with respect to time, we get:

a(t) = d(v(t))/dt = -2 * 3.8t

To find the magnitude of acceleration at the instant when velocity is zero, we need to solve for t when v(t) = 0.

0 = 22 - 3.8t^2

3.8t^2 = 22

t^2 = 22/3.8

t^2 ≈ 5.789

Taking the square root of both sides, we find:

t ≈ √(5.789)

t ≈ 2.403

Now we can substitute this value of t into the acceleration equation to find the magnitude of acceleration at that instant:

a(t) = -2 * 3.8 * 2.403

a(t) ≈ -18.258

Therefore, the magnitude of the acceleration of the particle at the instant when its velocity is zero is approximately 18.258 m/s².

The wave carries energy and momentum, and can interact with matter, causing phenomena such as absorption, reflection, refraction, and diffraction. Understanding the behavior of electromagnetic waves is crucial for many fields of science and technology, such as optics, electronics, telecommunications, and energy.

The proposed form for the electric and magnetic fields of the electromagnetic wave traveling at speed v in the x direction in a vacuum is given by E(x,t) = Emax sin(kx - wt) and B(x,t) = Bmax sin(kx - wt), where Emax and Bmax are the maximum values of the electric and magnetic fields, respectively, k is the wave number, w is the angular frequency, and t is time.
This form satisfies Maxwell's equations for the wave in vacuum, which state that the curl of the electric field is equal to the negative time rate of change of the magnetic field, and the curl of the magnetic field is equal to the time rate of change of the electric field.
The wave propagates through the vacuum as a disturbance in the electromagnetic field, consisting of oscillating electric and magnetic fields that are perpendicular to each other and to the direction of propagation. The magnetic field is created by the motion of charged particles, such as electrons, while the electric field is created by the changing magnetic field.
In vacuum, the wave travels at a constant speed of v = c, the speed of light, and is unaffected by the presence of charges or currents. The wave can be polarized in different ways, such as linear, circular, or elliptical polarization, depending on the orientation and amplitude of the electric and magnetic fields.

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Answer:

friction acts upon the ball when it is sliding down the slide and this action creates thermal energy

A magnitude charge of 1.0 μC (microcoulomb) creates a 1.0 N/C (newton per coulomb) electric field at a point 1.0 mm away.

The electric field strength (E) created by a point charge (Q) at a given distance (r) is given by Coulomb's law:

E = k × (Q / \(r^2\))

where k is the electrostatic constant (approximately 9 × \(10^9\) N·\(m^2/C^2\)). We can rearrange this equation to solve for the charge (Q):

\(Q = E \times r^2 / k\)

Given that the electric field strength (E) is 1.0 N/C and the distance (r) is 1.0 mm (which is equivalent to 0.001 m), we can substitute these values into the equation to calculate the magnitude of the charge (Q).

\(Q = (1.0 N/C) \times (0.001 m)^2 / (9 \times 10^9 N.m^2/C^2)\)

Simplifying the equation, we find:

Q ≈ 1.0 μC

Therefore, a magnitude charge of approximately 1.0 μC (microcoulomb) creates a 1.0 N/C (newton per coulomb) electric field at a point 1.0 mm away.

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We are given the vector v = -12i + 19j, and we are required to find its magnitude and direction angle.Step-by-step solution:Given vector is, v = -12i + 19jWe can find the magnitude of vector v using the Pythagorean theorem, i.e.,  v = √((-12)² + 19²)

Using a calculator, we get,v ≈ 22.455So, the magnitude of vector v is approximately equal to 22.455.Now, to find the direction angle of vector v, we need to first find its angle with respect to the positive x-axis. This can be done using the formula:θ = tan⁻¹(y/x)θ = tan⁻¹(19/-12)θ ≈ -56.31°

Since this angle is measured in the clockwise direction from the positive x-axis, we need to add 360° to it to get the angle measured in the counterclockwise direction from the positive x-axis.θ = 360° - 56.31°θ ≈ 303.69°Hence, the direction angle of vector v is approximately equal to 303.69° (rounded to one decimal place).Therefore, the magnitude of the vector v is ≈ 22.455, and its direction angle is ≈ 303.69°.

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When a white dwarf cools and stops emitting light, it undergoes a transformation known as a black dwarf.

A white dwarf is the remnant core of a low to medium-mass star that has exhausted its nuclear fuel. Initially, it is hot and radiates intense thermal energy, mainly in the form of visible light.

Over an extremely long timescale, on the order of trillions of years, a white dwarf gradually loses its heat and fades away. As it cools down, it transitions into a black dwarf, which is essentially a cold, dark stellar remnant. A black dwarf lacks the necessary energy to sustain any nuclear fusion or emit significant amounts of light.

However, it is important to note that the universe is currently not old enough for any white dwarf to have reached the black dwarf stage. The estimated age of the universe is around 13.8 billion years, while the process of a white dwarf cooling to become a black dwarf takes many orders of magnitude longer.

Therefore, at present, black dwarfs are purely theoretical objects, as none are expected to exist yet due to the vast timescales involved.

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Answer:

So this is just a ratio/proportion problem

so lets say its in boys:minutes

so in the first scenario

20:8

and we want to find

x:10

So proportion really

20/8=x/10

cross multiply

25

25 boys can sweep it in 10 minutes

We cannot determine the speed at which a star in the galaxy is moving away from us based on its mass, luminosity, age, or color alone. it is false

The speed at which a star in the galaxy is moving away from us is determined through the measurement of its spectrum using a technique known as redshift.

When a star or galaxy moves away from us, its light is shifted towards longer wavelengths, resulting in a redshift. By analyzing the degree of redshift, astronomers can estimate the speed at which the star is receding.

However, factors such as mass, luminosity, age, and color do not provide direct information about the star's motion away from us.

These characteristics are important for studying other properties of stars, such as their composition, brightness, evolutionary stage, and temperature. To determine the motion of a star in the galaxy, redshift measurements are essential.

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The angle θ for connecting member a to the plate so that the resultant of f a fa and f b fb is directed along the positive x axis are:

Fa=8sin54.93 in x direction

Fb=6sin40 in x direction

Resultant=10.4

The term magnitude is defined as the “how much of a quantity”. For instance, magnitude can be used for explaining the comparison between the speeds of a car and a bicycle. It can also be used to explain distance travelled by an object or to explain the amount of an object in terms of its magnitude.

In Physics, magnitude is defined as maximum extent of the size and the direction of an object. Magnitude is used as a common factor in the vector and scalar quantities. By definition, we know that the scalar quantities are those quantities that have magnitude only. Whereas the vector quantities are those quantities that have both magnitude and direction.

There are the different ways in which magnitude can be used. Some of them are:

The magnitude of a number, unlike magnitude of a physical quantity, is not relative to a scale or set of units: the magnitude of 100 is 100. By contrast, magnitude of a ruler is 12 in inches but is 30.48 in centimeters. Outside of the pure mathematics one has to be careful to specify the units in which the magnitude of some quantity is measured.

Therefore magnitude of resultant is:

=\(\sqrt{8sin54+936sin40}\)

=10.4

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Answer:

2 lol

Explanation:

Answer:

18

Explanation:

12 - 5 + 8 = 15

12 - 8 = 4

7 - 4 = 3

15 + 3 = 18

Answer:

Initial y-component of speed

Vy = 28 * sin 30 = 14 m/sec vertically

1/2 m Vy^2 = 2 m g h    conservation of energy of y-component

h = Vy^2 / (2 * g) = 14^2 / (2 * 9.8) = 10 m

Answer:

I think letter A

Explanation:

Hope it helps mwehehe

Answer:

   I = 2.667 kg m²

Explanation:

The moment of inertia of a body can be calculated by the expression

         I = ∫ L² dm

For high symmetry bodies the expressions of the moment of inertia are tabulated, for a rod with its axis of rotation at its midpoint it is

         I = \(\frac{1}{12}\) m L²

let's calculate

         I = \(\frac{1}{12}\)  2  4²

         I = 2.667 kg m²

When using an ammeter, the following describes the correct method of connecting the meter: the ammeter should be connected in series with the circuit. An ammeter is an electronic instrument that measures the electric current in a circuit in amperes (A) or milliamperes (mA).

An ammeter is utilized to calculate current. It is mostly utilized in circuits to measure current because measuring voltage on live circuits can be dangerous. It must be connected correctly to the circuit to get the proper measurement. It is important to connect an ammeter properly. An ammeter connected improperly can damage the ammeter or cause an explosion. An ammeter should be connected in series with the circuit.

A series circuit is an electrical circuit in which components are connected to one another such that the current passes through each component in turn. The positive terminal of the source is connected to the positive terminal of the first component, and the negative terminal of the first component is connected to the positive terminal of the second component.

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The speed of the car having kinetic energy 458,350 J  is 28.03m/s

What is What is Kinetic Energy ?

Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion. The type of motion can be vibration, rotation on an axis, translation (or travel along a path from one place to another), or any combination of these.

K.E = 1/2*m*v2

K.E = kinetic energy

m = mass

v = velocity/speed

458350 = 1/2*1167*v2

v2= 458350*2/1167

v = 28.03 m/s

The speed of the car having kinetic energy 458,350 J  is 28.03m/s

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Excessive exercise during early pregnancy may produce changes associated with an increased risk of miscarriage or premature birth.

In the early stages of pregnancy, excessive exercise can have a negative effect on fetal growth. As a result, women who engage in regular strenuous exercise may have an increased risk of miscarriage or premature birth. In addition, excessive exercise can lead to a decreased blood supply to the uterus and placenta, which can also cause problems for the developing fetus.

A pregnant woman should be cautious about exercising too much, especially during the first trimester when the fetus is still developing. The amount of exercise that is safe during pregnancy varies depending on the individual and their level of fitness. It is always recommended that women consult with their healthcare provider before starting any exercise program during pregnancy.The effects of excessive exercise during early pregnancy include an increased risk of miscarriage or premature birth. This is because excessive exercise can cause a decrease in blood supply to the uterus and placenta, which can lead to problems with fetal growth. It is important for pregnant women to consult with their healthcare provider before engaging in any exercise program during pregnancy.

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