During the swing of a frictionless pendulum, what energy form(s) remain constant?

Answer: Noise above 70 dB can cause hearing damage

Explanation:

Answer:

The decibel level that starts to have hearing damage is 120 dB.

Explanation:

9 ma at 1.9 v for 382 h (under other test conditions, the battery may have other ratings).The battery stores approximately 0.0066366 kJ of total energy.

The total energy stored in the battery can be calculated by multiplying the current (I) by the voltage (V) and the time (t) for which the battery is used. In this case, the current is 9 mA (0.009 A), the voltage is 1.9 V, and the time is 382 hours.
To calculate the total energy (E), we can use the formula:
E = I * V * t
First, we need to convert the current from milliamperes to amperes:
Current = 9 mA = 0.009 A
Now we can calculate the total energy:
E = 0.009 A * 1.9 V * 382 hours
To convert the energy from joules (J) to kilojoules (kJ), we divide the result by 1000:
E = (0.009 A * 1.9 V * 382 hours) / 1000
Simplifying the equation, we get:
E = 0.0066366 kJ
Therefore, the total energy stored in the battery is approximately 0.0066366 kJ, rounded to two decimal places.
In conclusion, the battery stores approximately 0.0066366 kJ of total energy.

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Answer:

Answer: B. 49 N

Explanation:

Friction Force

When an object is at rest on a rough surface, it encounters a friction force that opposes motion.

The friction force when an object is moving on a horizontal surface is calculated by:

\(Fr=\mu_k N\)

Where \(\mu_k\) is the coefficient of static friction and N is the normal force.  

If no forces other then the weight and the normal are acting upon the y-direction, then the weight and the normal are equal in magnitude:

N = W = m.g

Thus, the friction force is:

\(Fr=\mu_k W\)

We are given the coefficient of static friction \(\mu_k=0.5\) and the mass of the object m=10 Kg. The minimum force needed to make it start moving is the maximum friction force:

Fr=0.5*10*9.8

Fr = 49 N

Answer: B. 49 N

Answer:

1) 150 [m/min]; 2) 250 [m/min].

Explanation:

1) time=10min; distance=1,5km, then the speed=distance/time=1.5/10[km/min]= 0.15 [km/min] or 150 [m/min] or 2.5 [m/s];

2) time=10 min; distance=2.5 km, the the speed=distance/time= 2.5/10= 0.25[km/min] or 250 [m/min] or ≈4.17 [m/s].

Answer:

Below

Explanation:

The friction subtracts from the forward force

F = ma

(5000 - 1250) / 1500 = a    = 2.5 m/s^2

Answer:

red supergiants can

That is false. The oceanic crust is denser than the continental crust. The oceanic crust has an average density of 3g/cm^3. The continental crust has an average density of 2.7g/cm^3.

We must use the mechanical advantage formula to determine the length of the ramp:

Output force minus Input force equals Mechanical Advantage (MA). In this instance, the input force is the force required to hoist the object in the absence of the ramp, and the output force is the weight of the object being raised up the ramp

By dividing the length of the slope by its height, you may calculate the optimal mechanical advantage of an inclined plane. The ideal mechanical advantage of a ramp, for instance, is 3 metres 1 metre, or 3 metres, if you are loading a truck that is 1 metre high utilising it.

Basic Machines' Mechanical Advantage and Efficiency Calculated. The IMA is typically calculated as the resistance force (Fr) divided by the effort force (Fe). IMA is also equal to the product of the load's travel distance (d) and the distance over which the effort is applied (de).

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Given

\(m_1 = 2g\\\\m_2 = 0.2g\\\\v_1 = 2m/s\\\\v_2 = -8m/s\)

The expression for a perfectly inelastic collision,

\(m_1v_1 + m_2v_2 = (m_1+m_2)v_f\)

Therefore,

\(v_f = \frac{m_1v_1 + m_2v_2}{(m_1+m_2)} \\\\v_f = \frac{(2*2)+(0.2*-8)}{2+0.2}\\\\v_f = 1.09m/s\)

Since the bat and the bug fly towards each other, and after some time the bat swallows the bug, it is said to be a condition of perfectly inelastic collision.

The kinetic energy of the bat before it swallows the bug is,

\(KE_b = \frac{1}{2}m_1v_1^2\\\\KE_b = \frac{1}{2}2*2^2\\\\KE_b = 4gm^2/s^2\)

The kinetic energy of the bat after it swallows the bug is,

\(KE_f = \frac{1}{2}(m_1+m_2)v_f^2\\\\KE_f = \frac{1}{2}(2+0.2)1.09^2\\\\KE_f = 1.3gm^2/s^2\)

The total dissipation in the kinetic energy of the bat is calculated as,

\(\delta KE = KE_b - KE_f\\\\\delta KE = 4 - 1.3\\\\\delta KE = 2.7 gm^2/s^2\)

The fraction of the dissipated kinetic energy of the bat is calculated as,

\(d = \frac{\delta KE}{KE_b}\\\\d = \frac{2.7}{4}\\\\d = 0.67\)

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a)The amplitude of the wave will be 0.120m.

b)The period of the wave will be 1.60s.

Frequency is defined as the number of repetitions of a wave occurring waves in 1 second.

a)The amplitude of the wave will be 0.120m.

A is the initial displacement =0.120m

The amplitude represents the largest deviation from equilibrium. So that the amplitude of the wave will be equal to the maximum position.

Hence the amplitude of the wave will be 0.120m.

b)The period of the wave will be 1.60s.

The movement from maximum positive displacement to maximum negative displacement. The time period will be;

\(\rm \frac{T}{2} = 0.800 \\\\\ T= 1.6 \ sec\)

Hence the period of the wave will be 1.60s.

c) The frequency of the wave will be 0.625Hz.

The frequency is inversely proportional to the time period. Frequency is found as;

\(\rm f=\frac{1}{T} \\\\ \rm f=\frac{1}{0.625} \\\\ \rm f=0.625 \ Hz\)

Hence the frequency of the wave will be 0.625Hz.

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The displacement due to the constant speed and the displacement due to the deceleration gives a total displacement of 238.5 mi.

Displacement is the measurement of how far an object has moved from its initial position. It is commonly expressed in terms of distance and direction, and is often measured in terms of meters or kilometers. Displacement is a vector quantity, meaning it has both magnitude and direction.

The total displacement of the jetliner between touchdown and coming to rest can be calculated by adding the displacement due to the constant speed for 1.1 seconds and the displacement due to the deceleration over the same time period.

The displacement due to the constant speed of 143 mi/h for 1.1 s is found by multiplying the speed (143 mi/h) by the time (1.1 s) to get 159.3 mi.
The displacement due to the deceleration is found by calculating the average speed of the jetliner between touchdown and coming to rest, then multiplying this average speed by the time (1.1 s). The average speed of the jetliner is found by taking the difference between its initial speed (143 mi/h) and its final speed (0 mi/h) and dividing it by 2. This gives an average speed of 71.5 mi/h. Multiplying this average speed by the time (1.1 s) gives a displacement due to deceleration of 79.2 mi.
Adding the displacement due to the constant speed and the displacement due to the deceleration gives a total displacement of 238.5 mi.

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Answer:

the halfway point

Explanation:

As an object falls under the influence of gravity, kinetic energy and potential energy are equal at the halfway point only.

Answer:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Explanation:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

​

=

v

1

​

+

u

1

​

−20

1

​

=

v

1

​

−

25

1

​

⇒

v

1

​

=−

20

1

​

+

25

1

​

v=100cm

The image will be real, inverted magnified

Answer:

4.2 is the answer

Explanation

The image formed in a plane mirror is an equal distance behind the mirror as the object in front of it.

Step 1: the equation to this problem would be: 8.4/2

Step 2: 8.4 ÷ 2 = 4.2

Hope you could understand.

If you have any query, feel free to ask.

\(\sf{\pink{\underline{\underline{\blue{GIVEN:-}}}}}\)

\(\sf{\pink{\underline{\underline{\blue{TO\: FIND:-}}}}}\)

\(\sf{\pink{\underline{\underline{\blue{SOLUTION:-}}}}}\)

⚡ Let \(\rm{\vec{a}}\) and \(\rm{\vec{b}}\) are the two vectors .

✍️ We have know that,

\(\orange\bigstar\:\rm{\pink{\boxed{\green{\vec{a}\:.\:\vec{b}\:=\:ab\cos{\theta}\:}}}}\)

Where,

\(\rm{\implies\:\vec{a}\:.\:\vec{b}\:=\:ab\cos{90^{\degree}}\:}\)

\(\rm{\implies\:\vec{a}\:.\:\vec{b}\:=\:ab\times{0}\:}\)

\(\rm{\implies\:\vec{a}\:.\:\vec{b}\:=\:0\:}\)

\(\rm{\red{\therefore}}\) [1] The dot product of two vectors is “ 0 ” .

✍️ We have know that,

\(\orange\bigstar\:\rm{\pink{\boxed{\green{\vec{a}\:\times\:\vec{b}\:=\:ab\sin{\theta}\:}}}}\)

Where,

\(\rm{\implies\:\vec{a}\:\times\:\vec{b}\:=\:ab\sin{90^{\degree}}\:}\)

\(\rm{\implies\:\vec{a}\:\times\:\vec{b}\:=\:ab\times{1}\:}\)

\(\rm{\implies\:\vec{a}\:\times\:\vec{b}\:=\:ab\:}\)

\(\rm{\red{\therefore}}\) [2] The cross product of two vectors is “ ab ” .

the dot and cross product will become zero if the angle becomes 90°

hope it helps you...

#from india ✌✌✌

a) The magnitude of the electric field in the wall between the two layers of charge is 25 V/m.

(b) The potential difference between the inside and the outside of the cell is 0.125 V, with the inside being at a higher potential.

(a) To find the electric field in the wall, we can use Gauss's law. Since the cell wall material is air, which has a dielectric constant of approximately 1, the electric field inside the wall is equal to the electric field in a vacuum.

Therefore, the electric field magnitude is given by the charge density divided by the permittivity of free space (ε₀). Thus, E = σ/ε₀ = 5.0 / (8.85 × 10^(-12)) = 5.65 × 10^11 V/m. However, the electric field inside the cell wall will be half the magnitude of the electric field in the air, so E = 5.65 × 10^11 V/m / 2 = 2.83 × 10^11 V/m.

(b) The potential difference between the inside and outside of the cell can be obtained by multiplying the electric field by the thickness of the cell wall. V = Ed = (2.83 × 10^11 V/m) × 5.0 m = 1.42 × 10^12 V.

However, since the potential difference is defined as the difference in potential between two points, we need to divide by the unit charge (e) to get the potential difference per unit charge.

Therefore, the potential difference is V/e = (1.42 × 10^12 V) / (1.6 × 10^(-19) C) ≈ 0.125 V. The inside of the cell is at a higher potential since the positive charge layer is on the outside.

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Answer:

1.96 joules

Explanation:

PE = 1/2kx^2

Answer:

\(45 J\)

Explanation:

The equation for work is:

\(Work=Force*Distance\)

We can substitute the given values into the equation:

\(Work=15N*3m\\Work=45Nm\\Work=45J\)

Answer:

45 J

Explanation:

w =fd

w = 15(3)

Using the work done relation, the value of force is 25 Newton.

When a force is applied along a displacement, "work" in physics refers to the energy that is transported to or away from an object. The following situations include work: relocating a table. a door being pulled and pushed. Walking. raising a stone.

The work W that a force F traveling across a distance x exerts on an object is calculated using the formula W=Fs. If the object is moving in the opposite direction from how we expect it to, we add a minus sign.

Work done is equal to displacement times force.

50J = force × 2

f=50/2

Force = 25 Newton.

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D. Two substances must combine chemically.

One type of atom makes up an element, which is a white crystalline solid that cannot be divided into more than one component. Compounds are pure substances created by mixing two or more substances in a specific mass ratio.

Chemically pure substances that can be found in nature are called elements and compounds. An component is an object made of the same kinds of atoms as a compound, which is how they differ from one another.

It is common for the disorder to develop and the entropy of the system to increase as a result of the dispersion of molecules, atoms, and ions of one sort during the creation of a solution throughout a second substance.

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The acceleration of the car as it slowed down is -3.75 m/s². We can use the following formula to find the acceleration of the car: final velocity (v) = 0 m/s

initial velocity (u) = 30 m/s

time (t) = 8s

acceleration (a) = ?

We can use the formula: v = u + at

Rearranging the formula: a = (v - u) / t

Substituting the values of v, u, and t into the formula: a = (0 m/s - 30 m/s) / 8 s

a = -3.75 m/s²

The negative sign indicates that the car was decelerating or slowing down.

Therefore, the acceleration of the car as it slowed down was -3.75 m/s².

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a) A continuous visible light spectrum is one having all the wavelengths in the range 400 nm to 700 nm.

An emission spectrum has only a few wavelengths, while the continuous spectrum for the same element is a continuous spectrum with those same wavelengths missing.

a) A continuous visible light spectrum is one having all the wavelengths in the range 400 nm to 700 nm.

An emission spectrum has only a few wavelengths, while the continuous spectrum for the same element is a continuous spectrum with those same wavelengths missing.

b) The energy of a photon of light is directly proportional to its frequency and inversely proportional to its wavelength. This relationship is given by the equation E = hc/λ, where E is the energy of the photon, h is Planck's constant, c is the speed of light, and λ is the wavelength of the photon.

c) An emission spectrum is produced when electrons in an atom of a given element fall from higher energy levels to lower energy levels, releasing energy in the form of photons with specific wavelengths.

d) Emission spectra are obtained from hot gases because their atoms are relatively far apart so do not interact with each other.

The mass of a neutron is approximately 1.674 x 10^-27 kg.

e) The line spectrum from any given element is unique and can therefore be used to identify the element.

f) Line spectra are obtained when monochromatic light has passed through a cool gas and they consist of discrete lines on a continuous white light spectrum background.

g) An atom emits light when one of its electrons falls from a higher energy level to a lower energy level and this movement is called a transition. The energy of the emitted photon is equal to the energy difference between the two energy levels involved in the transition, and is given by the equation E = hf, where h is Planck's constant and f is the frequency of the photon.

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a) The magnitude of the net magnetic force that acts on the particle is 2.18 x 10-6 N.
b) The angle that the net force makes with respect to the x axis is 63.8°.

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.Magnetic Field is the region around a magnetic material or a moving electric charge within which the force of magnetism acts. A pictorial representation of the magnetic field which describes how a magnetic force is distributed within and around a magnetic material.

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The frequency and period of the hummingbird's wing flutter are 80 Hz and 0.0125 s respectively.

It can be defined as the number of flutter per second. The period is the time taken to complete a flutter.

Given here,

Hummingbirds can flutter wings 4800 times /minute.

The frequency of the wing flutter,

\(f = \dfrac {4800}{60}\\\\ f = 80 \rm \ Hz \ (times/s)\)

Period of the wing flutter,

\(P = \dfrac 1f\)

Now put the value in the formula,

\(P = \dfrac 1{80}\\\\ P = 0.0125\rm\ s\)

Therefore, the frequency and period of the hummingbird's wing flutter are 80 Hz and 0.0125 s respectively.

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Answer:

A hummingbird can flutter its wings 4,800 times per minute.

What is the frequency of wing flutters per second?

80

flutters/second

What is the period for one wing flutter in seconds? Round your answer to two significant figures.

 0.013  seconds

Explanation:

Explanation:

For 787 dreamliner airplane,

Mass, \(m_1=2450\ kg\)

Height, \(h_1=11500\ m\)

Potential energy of 787 dreamliner airplane is given by :

\(E_1=m_1gh_1\\\\E_1=2450\times 9.8\times 11500\\\\E_1=2.76\times 10^8\ J\)

For a boeing 747,

Mass, \(m_2=3150\ kg\)

Height, \(h_2=9000 \ m\)

:

Potential energy of a boeing 747 airplane is given by

\(E_2=m_2gh_2\\\\E_2=3150\times 9.8\times 9000\\\\E_2=2.77\times 10^8\ J\)

So, the potential energy of a boeing 747 airplane is more than the 787 dreamliner airplane.

Answer:

If the bicycle went down the hill, because if you are at the top of the hill, that is potential energy, when you start going down, it is turned into kinetic energy. Makes sense?

Explanation:

The mass flow rate of water is 0.087 Kg/s.

Contact tube diameter means no pressure head drop.

P=C heating done at P=C.

MC(T₁ - T₂) = Q = W

M × 1.015 (360-315) = 4000

M = 4000 / 1.015 × \(10^{3}\) × 45

M = 0.087 Kg/s

Pressure is defined due to the fact the pressure of all the gasoline particle/wall collisions divided thru the vicinity of the wall: All gases exert strain ; it's far one of the important measurable portions of this phase of depend.

From the weather to air tour, strain performs a dramatic position in our lives. It plays especially vital roles at some point of chemical reactions. through manipulating stress, chemists can pressure chemical reactions to occur and the transitions among solids, beverages, and gases to boost up.

The primary unit of pressure is the pascal, described because the stress exerted with the useful resource of a pressure of one newton perpendicularly upon a place of one square meter.

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Answer: I think the answer is C

Larry is an architectural drafter Francis is an architect Meka is a construction manager and Lacey's interior designer.

Using this illustration might also help with another idea: reducing the use of non-renewable energy. Enhancing the quality of the indoor environment is the design process' third objective. Thus, option C is correct.

A competent professional, an architect is responsible for the planning, design, and construction of buildings. Architects are well-trained in both the art and science of building design.

Building materials that are environmentally friendly are those that use resources efficiently, create little waste, and are both safe for the environment and people.

Industry trends are examined together with material types, environmentally friendly solutions, rating, and certification methods.

Therefore, Francis, Meka, Larry, and Lacey's interior designer, Lacey, are all architectural drafters; Francis is also an architect.

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