a child with mass 38.7 kg is running in circular motion around a pole at a distance 2.39 m from the pole. when the child has a speed of 7.83 m/s, what is the child's angular momentum about the pole?

A car accelerates from rest at a rate of 20 m/s2,  car would have traveled distance of 22.5 m by the time it reaches a speed of 30 m/s.

Acceleration is the rate at which the velocity changes with time, in terms of speed and direction both. An object moving in a straight line is accelerated if it speeds up/ slows down.

Given initial velocity is 0 ; acceleration, a = 20m/s²

Final velocity given 30m/s

v² = u² +2as

Distance, s = (v² - u²)/2a

= (30 - 0)/(2* 20)

Distance = 22.5 m

To know more about acceleration, refer

https://brainly.com/question/460763

#SPJ4

Answer:

I think top. of a mountain

Answer: You would weigh very slightly more at sea level than at the top of a mountain, not enough for you to notice, but a measurable amount. Weight, which really means gravitational force, is proportional to the product of the masses of two objects acting on each other, in this case the giant earth and the minuscule you.

Explanation:

Magnetic flux through each turn of the coil at an instant when the current is 3.51 A is 0.000547 Wb.

The induced emf in a coil is given by Faraday's law of electromagnetic induction as:

emf = - N(dΦ/dt)

where N is the number of turns in the coil, Φ is the magnetic flux through each turn, and dt/dt is the rate of change of magnetic flux.

Rearranging the above equation, we get:

Φ = - emf / (N (d/dt))

Substituting the given values, we get:

Φ = - (46.9 × 10⁻³ V) / (294 × (8.8 A/s)) = - 0.000191 Wb

At an instant when the current is 3.51 A, the rate of change of current is:

(d/dt) = 3.51 A/s

Substituting this value, we get:

Φ = - (46.9 × 10⁻³ V) / (294 × (3.51 A/s)) = - 0.000547 Wb

The negative sign indicates that the direction of the induced magnetic flux is opposite to the direction of the changing current.

Know more about Magnetic flux here:

https://brainly.com/question/30858765

#SPJ11

Answer:

The needed force is "1.5 Newtons". A further solution is provided below.

Explanation:

The given values are:

mass,

= 0.1 kg

acceleration,

= 15 m/s²

As we know,

⇒ \(Force= mass\times acceleration\)

On substituting the given values, we get

⇒            \(=0.1\times 15\)

⇒            \(=1.5 \ Newtons\)

Hi there!

To solve, we can use a summation of torques.

For the see-saw to balance, the sum of torques must equal 0, so:

∑τ = 0

Recall that:

τ = rFsinθ

r = distance from pivot (meters)

F = force (N)

In this case, the forces are the weight of the children. Also, we can leave the distance in centimeters for this type of problem, but others do require a conversion to meters.

Multiply each mass by 10 (g ≈ 10 m/s²) to get the weight:

Στ = 270(400) - x(300) = 0

270(400) = 300x

Solve for 'x', the distance in cm away from the fulcrum:

108000/300 = 360 cm

The given statement is true. A sight glass is a transparent or translucent window installed in a pipeline or vessel to visually inspect the presence, level, and characteristics of a fluid.

Explanation: When a sight glass is full of vapor, it may appear similar to when it is filled with liquid. This is because both vapor and certain liquids can be transparent or have similar optical properties. In such cases, it can be challenging to distinguish between a sight glass filled with vapor and one filled with liquid by visual observation alone.

To accurately determine whether a sight glass is filled with vapor or liquid, additional information or techniques may be required.

For example, measuring the temperature or pressure of the system, observing any condensation or evaporation occurring in the sight glass, or employing other complementary instruments or indicators can help differentiate between vapor and liquid contents.

To know more about translucent visit

https://brainly.com/question/18798041

#SPJ11

The he nickel has a greater density than the penny and quarter because it has the greater mass to volume ratio.

Density is the ratio of the mass and volume of a substance.

Density measures the compactness of the particles of a substance.

When comparing the density two objects of equal volume, the denser objects will have more mass or weight.

The model hypothesis is as follows:

If the nickel has a greater density than the penny and quarter, then it will have a greater mass to volume ratio. If the penny has a lower density than the nickel and quarter, then it will have a lower mass to volume ratio.

By taking measurements of the mass and volume of the nickel, penny and quarter, it will be observed that the nickel has the higher mass to volume ratio. Hence, nickel has a greater density than the penny and quarter.

In conclusion, the density of a substance is the mass and volume ratio of that substance.

Learn more about density at: https://brainly.com/question/952755

#SPJ1

Answer:

the answer is C a material or substance

Explanation:

BRAINLIEST PLZZZZZZZZZZZZZZZ

300 meters because 5x600=3000 and 3000÷10=300 please someone check me for this answer

Answer:

4.6 billion years

Explanation:

Answer:

A. Energy = 490 Joules

B. Power = 16.3 Watts

Explanation:

Given the following data;

Mass = 5kg

Height = 10m

Time = 3 seconds

To find the power;

First of all, we would have to determine the energy possessed by the object due to its height (potential energy).

We know that acceleration due to gravity is equal to 9.8m/s²

Energy = mgh

Energy = 5*9.8*10

Energy = 490 Joules

Now, we would find the power;

Power = energy/time

Power = 490/3

Power = 16.3 Watts

Answer:

2,340,000 J

Explanation:

Work done can be described as when energy or force is applied to an object to cause displacement

Work done is measured in joules

1 Watt = 1 Joule / second

650 watts = 650 Joules / second

convert 650 joules to seconds by multiplying by 3600

650 x 3600 = 2,340,000 J

The biker must convert all of his kinetic energy into thermal energy in order to come to a full stop. The work is resistive because the braking force resists movement, hence W = -10 214.4

Ours has Ek = 1/2m x v2 

Ek = 1/2mxv2

Ek = 1/2x79.8x162

Ek = 10214.4 J

As long as the forces being applied are conservative (don't rely on the route), the mechanical energy in a system stays constant, according to the rule of conservation of mechanical energy.

The combination of kinetic energy, or energy of motion, and potential energy, or energy stored in a system as a result of the arrangement of its components, is known as mechanical energy.

The mechanical energy of an item is just the product of its kinetic and potential energy. Depending on the direction and amount of the kinetic and potential energy, it can be either positive or negative.

learn more about mechanical energy refer

https://brainly.com/question/24443465

#SPJ10

Answer:

Increase height

Increase mass

Answer:

C - Branden believes that he is not okay unless he is perfect.

Explanation:

sorry im late but good luck <3

Answer:

c

Explanation:

Answer:

B my brother say that it was

The speed of the wave on a string is given by Taylor's formula:

where

F = tension force

μ = linear density = mass per unit length

But also we can say the speed of any wave is given by:

where:

λ = wave length

f = frequency

Plug the second equation in the first one. We get:

Now solve for f:

Lets say wave length is the same on the second case. Since it's the same string μ will also be the same.

See that 340 N = 2 x 170, so we can write:

75.064 cm

Explanation

to solve this we need to know the equivalence

then

let's use a equivalente fraction to convert the measure

hence, the answer is 75.064 cm

I hope this helps you

Answer: Kinetic energy is the energy an object has because of its motion

(if it needs to be a one worded answer than just type motion)

The potential energy of an object depends on its mass and its height.

The law of conservation of energy states that energy can be neither created nor destroyed, but it can change its form.

Answer:Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work.

As expressed by the equation, potential energy depends upon the mass and the height of the object. Any increase in these two quantities will lead to an increase in the amount of potential energy possessed by the object.

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.

Explanation:

sorry I need some points foe this

The image is located 52.63 cm away from lens B.

The image formed is real.

The equation of the constructor of geometric optics is used here. it is given as,

                                                  \(\frac{1}{q} = \frac{1}{f} - \frac{1}{p}\)

where,

q = distance of image from the lens

f = focal length of the lens

q = distance of the object from the lens

Lens A

To find the distance of the image from lens A

\(\frac{1}{qa} = \frac{1}{fa} - \frac{1}{p}\)

\(\frac{1}{qa} = \frac{1}{5.87} - \frac{1}{10.9}\)

\(\frac{1}{qa} = 0.08\)

\(qa = 12.5 cm\)

Lens B

The distance between the lenses minus the distance to the image is the distance from lens B to the object,

\(pb = d - qa\)

    \(= 61.1 - 12.5\)

\(pb = 48.6 cm\)

Now use the constructor's equation to find the distance of image from lens B,

\(\frac{1}{q} = \frac{1}{fb} - \frac{1}{pb}\)

\(\frac{1}{q} = \frac{1}{25.1} - \frac{1}{48.6}\)

\(\frac{1}{q} = 0.019\)

\(q = 52.63 cm\)

Hence, the image is located 52.63 cm away from lens B.

I understand the question you are looking for is this:

A 5.39 mm high firefly sits on the axis of, and 10.9 cm in front of, the thin lens A, whose focal length is 5.87 cm. Behind lens A there is another thin lens, lens B, with a focal length of 25.1 cm. The two lenses share a common axis and are 61.1 cm apart.  Is the image of the firefly that lens B forms real or virtual? How far from lens B is this image located?

Learn more about image formation through lens here:

https://brainly.com/question/15724130

#SPJ4

The maximum kinetic energy of the ejected electrons will be 0.71 eV.

The kinetic energy (KE) of electrons is defined as the product of one-half of the mass of the electron to the square of the velocity at which electrons spin in orbit.

Given data;

λ(Wavelength)= 400 × 10⁻⁹ m

Φ(Work function)=2.4 eV

c(Speed of light)= 3 ×10⁸ m/sec

h(Constant) = 6.626 * 10^-34

\(\rm \phi = 2.4 eV = 2.4 \times 1.6 \times 10^{-19} \\\\ \rm \phi =3.84 \times 10^{-19} \ J\)

The maximum kinetic energy is found as;

\(\rm KE= \frac{hc}{\lambda} - \phi \\\\ KE= \frac{6.64 \times 10^{-34}}{400 \times 10^{-9}} -3.84 \times 10^{-19} \\\\ KE=1.14\times 10^{-19} \ J\)

Unit conversion:

1 eV = 1.6 * 10⁻¹⁹ j

1 J=1/( 1.6 * 10⁻¹⁹) ev

KE=0.71 eV

Hence, the maximum kinetic energy of the ejected electrons will be 0.71 eV.

To learn more about the kinetic energy of electrons refers to:

https://brainly.com/question/13145345

#SPJ1

This is an exercise in Rectilinear Uniformly Varied Motion (MRUV) is a type of motion in which an object moves in a straight line and experiences changes in its velocity at a constant rate. In this type of motion, the acceleration of the object remains constant over time.

The distinctive feature of the MRUV is that the velocity of the object changes uniformly, that is, its velocity increases or decreases by a constant amount in each unit of time. If the object experiences a positive acceleration, its velocity increases with time. On the other hand, if the object experiences a negative acceleration, its speed decreases.

In an MRUV, constant acceleration has a direct impact on displacement and the time it takes for the object to reach a certain speed. Also, the direction of the acceleration determines whether the object is accelerating or decelerating relative to its initial motion.

This type of movement is found in various situations of daily life, such as the launch of an object upwards and its subsequent fall, the movement of cars on a road with acceleration or braking, or even the study of bodies in free fall.

Vf = V₀ + a × t

Where:

In this case, the initial velocity (vi) is 1 m/s, the acceleration (a) is -1 m/s^2 (negative because it indicates deceleration), and the time (t) is 4 seconds.

Substituting these values into the formula, we get:

Vf = V₀ + a × t

Vf = 1 m/s + (-1 m/s²) × 4 s

Vf = 1 m/s - 4 m/s

Vf = -3 m/s

Answer:

d

Explanation:

because earth does have more water than land so it would be d

Hard glass is a type of glass characterized by its high resistance to thermal and mechanical stress. It is commonly used in scientific and industrial applications. The components of glass can be classified into formers, intermediates, and modifiers.

Hard glass, also known as borosilicate glass, is a type of glass that possesses high resistance to thermal expansion and mechanical stress. It is composed mainly of silica (SiO2) and boron oxide (B2O3), which act as formers in the glass structure. The formers provide the basic framework of the glass and contribute to its high durability and thermal stability.

In addition to formers, glass can also contain intermediates and modifiers. Intermediates, such as alumina (Al2O3) and magnesia (MgO), help in reducing the melting point of the glass and improve its workability during the manufacturing process. Modifiers, such as sodium oxide (Na2O) and calcium oxide (CaO), alter the properties of the glass, such as its refractive index and chemical resistance.

By combining the right proportions of these components, glassmakers can produce glass with specific characteristics suitable for various applications, ranging from laboratory equipment and optical lenses to household items and industrial containers.

Learn more about thermal here:

https://brainly.com/question/14506133

#SPJ11

Answer:

It has several other objects in its orbit, though few are as massive as itself."

Answer:

Explanation:

Laminar Flow is a very important topic discussed in physics in the subject of fluid dynamics. Basically, it explains how fluid particles behave at lower velocities. In such cases and when the viscosity of the fluid is low, the fluid particles flow smoothly in perfectly perpendicular layers that do not collide or cross each other. Unlike turbulent flow, which is the opposite. An example of Laminar flow can be seen when you open up a water hose with little pressure, the water simply flows out of the hose and looks very clear and smooth.

Answer:

\(125\:\mathrm{minutes\: or\: }2.08\bar{3}\: \mathrm{hours}\)

Explanation:

Speed is given by \(s=\frac{d}{t}\), where \(d\) is distance travelled and \(t\) is time. Rearranging this equation, we have \(t=\frac{d}{s}\).

Plugging in our given information:

\(t=\frac{d}{s}=\frac{1500\:\mathrm{km}}{720\:\mathrm{km/h}}=2.08\bar{3}\: \mathrm{hours}\)

Thus, our answer is:

\(2.08\bar{3}\: \mathrm{hours}\cdot \frac{60\:\mathrm{minutes}}{1\:\mathrm{hour}}=\fbox{$125\:\mathrm{minutes}$}\)