A rubber band that has been stretched has gained ____ energy
OA) heat
OB) kinetic
OC) potential
D) chemical​

Answer:

the correct answer is 3 meters

Answer:

220.46 lbs

Multiply the mass by 2.205 for an approxinate result.

The answer is 220.462.

The car will skid at 80m

As we know that In mechanics, acceleration is the rate of change of the velocity of an object with respect to time.

It is a vector quantity

The velocity is the distance covered by an object per unit time

Given

Initial velocity (u) = 15m/s

Final Velocity (v) = 0m/s

Distance (s) = 20 m

Deceleration (a) =?

Now we know that ,

v² = u² + 2as

Substituting the value

0² = 15² + (2)*(a)*(20)

0 = 225 + 40a

Collecting the  like terms

0 – 235 = 40a

–225 = 40a

To find the value of a divide  both side 40

a = –225 / 50

a = –5.625 m/s²

Determination of the distance

Deceleration (a) = –5.625 m/s²

Initial velocity (u) = 30 m/s

Final velocity (v) = 0 m/s

Distance (s) =?

v² = u² + 2as

0² = 30² +(2 × –5.625 × s)

0 = 900 – 11.25s

Collecting  like terms

0 – 900 = –11.25s

–900 = –11.25s

To find the value of s divide both side by –11.25

s = –900 / –11.25

s = 80 m

Hence the car will skid 80 m

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All three balls of equal mass will have the same speed at the bottom of their respective ramps.

When the balls roll down the ramps, they convert their potential energy (due to their height) into kinetic energy (due to their motion). The potential energy of each ball is the same since they all start from the same height. According to the law of conservation of energy, this potential energy is converted entirely into kinetic energy when they reach the bottom of the ramps.

Since all the balls have the same mass, the kinetic energy depends solely on their speed. Therefore, the balls will have the same speed at the bottom of their ramps. The mass of the balls does not affect their speed in this scenario.

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Answer:

By pointing one's right thumb along the direction of the current, the direction of the magnetic field can by found by curving one's fingers around the wire. The strength of the magnetic field depends on the current I in the wire and r, the distance from the wire.

The energy of the ejected photoelectron is 1.89 eV.


Energy of radiation, E = 4.2 eV Work function of photocell, φ = 2.31 eV

Energy of ejected photoelectron is given by the difference of the energy of incident radiation and the work function of the metal. That is, KE = hυ - φ where, h is Planck's constant, υ is the frequency of radiation, c = λυ is the speed of lightλ is the wavelength of radiation and c is the speed of light.

From the energy formula of radiation, E = hυE = hc / λ, by substituting h and c values

KE = hc / λ - φ

Given, h = 6.626 x 10^-34 J-s, c = 3 x 10^8 m/s

λ = hc / E

= (6.626 x 10^-34 J-s x 3 x 10^8 m/s) / (4.2 eV x 1.6 x 10^-19 J/eV)

= 4.93 x 10^-7 m

KE = hc / λ - φ

= (6.626 x 10^-34 J-s x 3 x 10^8 m/s) / (4.93 x 10^-7 m) - (2.31 eV x 1.6 x 10^-19 J/eV)

= 1.89 eV

Therefore, the energy of the ejected photoelectron is 1.89 eV.

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Answer:

20mA

Explanation:

because it is connected in series with the ammeter

The current through the 40Ω resistor in the given circuit is 20mA, which is explained below.

The volate across resistor R is 1V, as indicated by the voltmeter.

Since the potential of the battery is 3V, according to Kirchoff's voltage law, the voltage drop across 20Ω resistors must be 1V each since they are indentical.

Let a total current I passes through 20Ω resistor as it is connected to the battery in series. From Ohm's law:

20Ω × I = 1V

I = 50mA

Now the current indicated by the ammeter is 20mA which splits according to the reistors of 15Ω and 30Ω which are connected in parallel. Then again the current adds up to 20mA when leaving the set of parallel resistors, through the 40Ω resistor.

So the current through the 40Ω resistor is 20mA

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Given,

The mass of the board, m=5 kg

The reading on the weighing board near the feet of Annabelle, F₁=380 N

The reading of the weighing board near the head of Annabelle, F₂=280 N

The total distance between the two weighing boards, d=2.50 m

Let us assume that the centre of mass of the board lies exactly at its geometrical centre. Thus the distance of the centre of mass of the board from either of the weighing boards is l=2.50/2=1.25 m

a)

As the system is in equilibrium, the total downward gravitational force is equal to the upward reaction force applied by the boards. Thus,

Where M is the mass of Annabelle and g is the acceleration due to gravity.

On substituting the known values,

Thus Annabelle's mass is 62.35 kg

b)

The entire system is also in rotational equilibrium and net torque is zero.

Let us assume that the weighing board near Annabelle's feet is the pivot point of the system.

Therefore,

Where d_c is the distance of the centre of mass of Annabelle from her feet.

On rearranging the above equation,

On substituting the known values,

Thus the centre of mass of Annabelle is 1.05 m from her feet.

Answer:

d = 8 m

Explanation:

Given that,

Initial speed, u = 0

Final speed, v = 4 m/s

Time, t = 4 s

We need to find the distance traveled by a bike. Let it is equal to d. Using second equation of kinematics as follows :

\(d=ut+\dfrac{1}{2}at^2\\\\\text{a=acceleration of bike and u = 0}\\\\d=\dfrac{1}{2}\times \dfrac{v-u}{t}\times t^2\\\\d=\dfrac{(v-u)t}{2}\\\\d=\dfrac{(4-0)4}{2}\\\\d=8\ m\)

So, the car cover a distance of 8 m.

The bike will travel the distance of 8 m during the given time interval.

Given data:

The initial speed of bike is, u = 0.0 m/s.

The final speed of bike is, v = 4.0 m/s.

The time interval is, t = 4 s.

In given problem, we need to obtain the magnitude of acceleration first. Then we can use this value in the third kinematic equation of motion, to find the distance covered by bike.

Then by first kinematic equation of motion,

v = u + at

Solving as,

4.0 = 0 + a(4)

a = 1 m/s²

Now, we can use the third kinematic equation of motion to find the distance travelled as,

\(v^{2}=u^{2}+2as\)

Solving as,

\(4.0^{2}=0^{2}+2(1)s\\\\16 = 2s\\\\s = 8\;\rm m\)

Thus, we can conclude that the bike will travel the distance of 8 m during the given time interval.

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Answer:

15 V

Explanation:

From the question,

For series connection: (i) Both resistor have a common current flowing through the (ii) The combined resistance = R1+R2

Rt = R1+R2.................. Equation 1

Given: R1 = 5 ohms, R2 = 7.5 ohms.

Rt = 5+7.5 = 12.5 ohms.

Applying Ohm's law,

V = IRt................... Equation 2

Where V = Voltage, I = current.

make I The subject of the equation

I = V/Rt.............. Equation 3

Given: V = 25 V, Rt = 12.5 ohms.

Substitute into equation 3

I = 25/12.5

I = 2 A.

Now,

Voltage drop across the 7.5 ohms resistor = R2×I

Voltage drop across the 7.5 ohms resistor = 7.5×2

Voltage drop across the 7.5 ohms resistor = 15 V

Answer:

Explanation:

the average speed of the object is 6.67 m/s

Answer:

Below

Explanation:

CO2 buildup during exercise stimulates respiration

Frequency is perceived by humans as pitch; The sound intensity is the amplitude; Humans can only hear a specific range of sound, usually from 20 Hz to 20,000 Hz; The factors that go into a sound are its intensity, frequency and overtones (which are like interference, or background noises).

It's "Pitch" on edge.

Answer:

Explanation:1.6 N

Explanation:

Weight, W = mg where m = mass = 0.16 kg and g = 10 N/kg

W = mg = 0.16 kg × 10 N/kg = 1.6 N

The weight of the cricket ball is 0.588 N.

Given data:

The mass of cricket ball is, m = 0.06 kg.

The weight of any object can be expressed as the product of mass and gravitational acceleration. Then the weight of cricket is given as,

W = mg

Here, g is the gravitational acceleration.

Solving as,

\(W = 0.06 \times 9.8\\\\W =0.588 \;\rm N\)

Thus, we can conclude that the weight of the cricket ball is 0.588 N.

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Main answer-

PE=mgh

KE=E-PE

V = (2*g*h)^½

at point A

PE = 10*9.8*50=4900 J

KE = 0 J  ( because the velocity of the body is 0)

V=0

at point B

PE = 10*9.8*35=3430 J

KE = 4900-3430=1470 J

V= ( 2*9.8*15)^ ½

V=17.14 m/s

at point C

PE= 10*9.8*25=2450 J

KE=4900-2450=2450 J

V= (2*9.8*25)^ ½

V=22.135 m/s

at point D

PE=10*9.8*0=0 J

KE=4900-0=4900 J

V=(2*9.8*50)^ ½

V=31.30 m/s

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After 15 minutes :

M = M₀ (1/2)^(t/T)

M = 2 (1/2)^(15/3)

M = 0.0625 gr

In order to get 0.1 gr :

M = M₀ (1/2)^(t/T)

0.1 = M₀ (1/2)^(30/3)

0.1 = Mo / 1024

Mo = 102.4 gr

Given data:

* The mass of the cannonball is m_1 = 49 kg.

* The initial velocity of the cannonball is u_1 = 0 m/s.

* The final velocity of the cannonball is v_1 = 134 m/s.

* The mass of the boat and pirate is m_2 = 356 kg.

* The initial velocity of the boat and pirate is u_2 = 0 m/s.

Solution:

According to the law of conservation of momentum, the net momentum of the system in the initial state is equal to the net momentum of the system in the final state.

Thus,

Substituting the known values,

By simplifying,

Here, the negative sign indicates the motion of the boat and pirate is opposite to the direction of the cannonball.

Thus, the velocity of the boat and pirate after the cannonball fired is -18.44 meters per second.

The magnitude of the magnetic field (b) required to balance the weight of the bird and the wire is determined by the equation F = BIL, where F is the weight of the bird and the wire, I is the current flowing through the wire, and L is the length of the wire.

When a wire carrying a current is placed in a magnetic field, a force is exerted on the wire due to the interaction between the magnetic field and the moving charges in the wire. This force can be determined using the equation F = BIL, where F is the force, B is the magnitude of the magnetic field, I is the current, and L is the length of the wire.

In this case, the force due to the magnetic field needs to balance the weight of the bird and the wire. Therefore, the weight of the bird and the wire is equal to the force exerted by the magnetic field, and we can set F equal to the weight. By rearranging the equation, we have F = mg, where m is the mass of the bird and g is the acceleration due to gravity.

Equating the weight (mg) to the force (BIL), we can solve for the magnitude of the magnetic field (B). Rearranging the equation gives B = mg/(IL). By knowing the values of the mass of the bird, the length of the wire, and the current flowing through the wire, we can calculate the magnitude of the magnetic field required to balance the weight of the bird and the wire.

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1.875

Explanation:

speed = distance moved ÷ time taken

Answer:

frictional force in units of newton

Answer:

A.) Oxidation

Explanation:

:p

Hydrogen reacts with oxygen, hydrogen loses electrons. The term

applies to what happens to hydrogen in this reaction is

A. Oxidation

Oxidation is a process where a substance: Loses one or more electrons or gains an oxygen atom or we can say that oxidation is a process which involves the addition of oxygen or any electronegative element or the removal of hydrogen or any electropositive element.

Reduction is the gain of electrons or reduction is a process which involves the addition of hydrogen or any electropositive element or the removal of oxygen or any electronegative element.

A synthesis reaction is a type of reaction in which multiple reactants combine to form a single product. Synthesis reactions release energy in the form of heat and light, so they are exothermic.  

correct option is A. Oxidation

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Answer:

If a star is moving towards the earth, its light is shifted to higher frequencies on the color spectrum (towards the green/blue/violet/ultraviolet/x-ray/gamma-ray end of the spectrum). A higher frequency shift is called a "blue shift".

Explanation:

It just means that the entire spectrum is shifted up in frequency.

The time constant of the circuit can be determined from the formula τ = RC. The values given in the question are R = 4.00 MΩ and C = 3.00 µF. Thus, the time constant is given as:τ = RC = (4.00 × 10^6 Ω) × (3.00 × 10^-6 F) = 12 secondsb. The current in the circuit can be found by using Ohm’s law, which states that I = V/R, where V is the voltage across the circuit.

The voltage across the circuit is 12.0 V, so the current is given as:I = V/R = (12.0 V)/(4.00 MΩ) = 3.00 µAThe charge on the capacitor as a function of time can be found using the formula Q = Qmax (1 - e^(-t/τ)), where Qmax is the maximum charge that can be stored by the capacitor. The maximum charge can be found using the formula Qmax = CV, where V is the voltage across the capacitor.

The voltage across the capacitor is the same as the voltage across the circuit, which is 12.0 V. Thus, the maximum charge that can be stored by the capacitor is:Qmax = CV = (3.00 × 10^-6 F) × (12.0 V) = 36 µCThe charge on the capacitor as a function of time is given as:Q = Qmax (1 - e^(-t/τ)) = (36 µC) (1 - e^(-t/12)).

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Answer:

x = - 8 atau 3

Explanation:

3ˣ² × 3⁵ˣ = 3²⁴

Penarikan:

Mᵃ × Mᵇ = Mᵃ⁺ᵇ

3ˣ² × 3⁵ˣ = 3ˣ²⁺⁵ˣ

Karena itu

3ˣ² × 3⁵ˣ = 3²⁴

3ˣ²⁺⁵ˣ = 3²⁴

x² + 5x = 24

Mengatur kembali

x² + 5x - 24 = 0

Pemecahan dengan faktorisasi

x² - 3x + 8x - 24 = 0

x (x - 3) + 8 (x - 3) = 0

(x + 8) (x - 3) = 0

x + 8 = 0 atau x - 3 = 0

x = - 8 atau x = 3

Karena itu,

x = - 8 atau 3

Answer:

2. Mathew Maury

Explanation:

2. Mathew Maury

4. Cousteau and Gagnon

Explanation:

they made the first successful scuba in 1942

Answer:

The Correct Answer is

The U.S. Constitution says powers not given to the federal government belong to the states.

Explanation:

In the paragraph, Jefferson states defending the rights of states is one of the fundamental, or most significant, policies of our administration. Did that get you to remember the Tenth Amendment? It restrains the authority of the central government, defending the rights of states. It states that the central government only has the authorities listed in the Constitution. Unlisted authorities belong to the states.

Answer:

D

Explanation:

Answer: \(-1.51*10^-6 C/m^2\) According to the question,A 10.0-g piece of Styrofoam carries a net charge of -0.700 μC and floats above the center of a large

horizontal sheet of plastic that has a uniform charge density on its surface.To determine the charge per unit area on the plastic sheet we can use the given formula below,where r is the distance between the charged object and the surface, and s is the charge density on the surface.

(s = Q/A), where Q is the total charge on the surface and A is the area of the surface.`V = kQ/r = s*r`We have the mass of Styrofoam, m = 10.0 gWe have the charge on Styrofoam, Q = -0.700 μCWe also know that Styrofoam is floating above the center of the plastic sheet, thus, r is the distance between them.

To determine r, we can consider the forces acting on the Styrofoam.mg \(= kQ^2/r^2\) We can solve for

r.r = \(sqrt(kQ^2/mg)\)The formula for k is given by

\(k = 8.99*10^9 N.m^2/C^2\) Substituting the values

r = \(sqrt((8.99*10^9 N.m^2/C^2)(0.700*10^-6 C)^2/(0.0100 kg)(9.81 m/s^2))\)

On solving we get r ≈ 7.89*10^-4 mThe distance between the Styrofoam and the plastic sheet is

r = \(7.89*10^-4\)mNow we can find s.

From the formula,V = kQ/r = s*rwe

get,s =\(V/r = kQ/r^2\)

\(= (8.99*10^9 N.m^2/C^2)(-0.700*10^-6 C)/(7.89*10^-4 m)^2\) On solving, we get the charge per unit area on the plastic sheet s ≈\(-1.51*10^-6 C/m^2\)

Answer: \(-1.51*10^-6 C/m^2\)

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The novelty clock consists of a 0.0185-kg mass object bouncing on a spring with a force constant of 1.25 N/m.

The force constant of a spring, denoted by k, represents its stiffness or resistance to deformation. In this case, the spring in the novelty clock has a force constant of 1.25 N/m. The force exerted by a spring is given by Hooke's Law, which states that the force is proportional to the displacement from the equilibrium position. Mathematically, this can be expressed as F = -kx, where F is the force, k is the force constant, and x is the displacement.

The 0.0185-kg mass object in the novelty clock is subject to the force exerted by the spring. As the object compresses or stretches the spring, a restorative force is generated, causing the object to bounce. The characteristics of this bouncing motion, such as the amplitude and frequency, will depend on the mass of the object, the force constant of the spring, and any external factors affecting the system.

Overall, the combination of the 0.0185-kg mass object and the spring with a force constant of 1.25 N/m creates the bouncing motion that defines the behavior of the novelty clock.

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Answer:inertia

Explanation:

A car hits a tree and doesn’t stop, but keeps going until severely damaged. This is because of the principle of Inertia.

It states that" When a body s at rest it remains at rest, and IF the body is in motion It remains in motion until an external force is applied to that object."

i.e

If F=0, Then v= constant

and when that constant =0 then the body is at rest.

Where F= force

v = velocity.

Inertia is the tendency of an object to resist changes in its state of motion. In this case, the car was moving at a certain speed before it hit the tree, and because of its inertia, it continued to move forward even after the collision with the tree.

The car only stopped when another force acted on it, such as the force of the tree, or the force of friction with the ground, which slowed it down and eventually brought it to a stop. The severe damage to the car was a result of the force of the impact, which was a combination of the car's speed and its mass.

Hence the car does not stop because of the principle of inertia.

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