While an object is moving at a constant 20 m/s, a 5 N forcepushes the object to the left. At the same time, a 5 N force ispushing the object to the right. What will the object'svelocity be after 10 seconds?

To calculate the height of the cliff and the time it takes for the rock to reach the ground when thrown straight down, we can use the equations of motion.

(a) Height of the cliff:

When the rock is thrown straight up, it reaches its highest point before falling back down. The time it takes for the rock to reach its highest point is equal to the time it takes for the rock to fall back down to the ground.

Using the equation:

s = ut + (1/2)at^2

Where:

s is the distance traveled (height of the cliff),

u is the initial velocity (8.19 m/s),

t is the time (2.32 s),

a is the acceleration due to gravity (-9.8 m/s^2, taking downward direction as negative).

Rearranging the equation:

s = ut + (1/2)at^2

s = (8.19)(2.32) + (1/2)(-9.8)(2.32)^2

s = 19.004 - 25.798

s = -6.794 m

Since the height of a cliff cannot be negative, we take the absolute value of the result:

Height of the cliff = |s| = 6.794 m

So, the height of the cliff is approximately 6.794 meters.

(b) Time to reach the ground when thrown straight down:

When the rock is thrown straight down with the same speed, the initial velocity (u) is still 8.19 m/s, but the acceleration due to gravity (a) remains -9.8 m/s^2.

Using the equation:

s = ut + (1/2)at^2

Where:

s is the distance traveled (height of the cliff, which is now negative),

u is the initial velocity (8.19 m/s),

t is the time we want to find,

a is the acceleration due to gravity (-9.8 m/s^2, taking downward direction as negative).

Substituting the known values:

-6.794 = (8.19)t + (1/2)(-9.8)t^2

Rearranging the equation:

-6.794 = 8.19t - 4.9t^2

Rearranging further:

4.9t^2 - 8.19t - 6.794 = 0

Solving this quadratic equation, we find two possible values for t: 0.828 seconds and 1.303 seconds. Since we are considering the time it takes to reach the ground, the valid solution is t = 0.828 seconds.

Therefore, when the rock is thrown straight down, it takes approximately 0.828 seconds to reach the ground.

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Answer:

No the statement is incorrect.

Explanation:

Mathematically, force F experience of a charge particle of magnitude q in an uniform electric field E is given as

F = E/q

In uniform electric field is where the intensity of electric field remains same throughout. However, from the above equation it is clear that force experience by the charge particle also depends upon the magnitude of charge particle as well. So, with change in charge particles the force experienced by it also changes.

Answer:

Astronomers?

Explanation:

Answer:

Astrophysicist?

Explanation:

When a pulsed wave encounters an obstruction, the wavelength and frequency remain constant.

Representation in mathematics. Traveling sinusoidal waves are frequently mathematically characterized as having a velocity (in the x direction), frequency (f), and wavelength (A) as follows: where y seems to be the value of the wave at any place (x, t), and A is the wave's amplitude.

The space between two successive crests and troughs of light wave is referred to as the wavelength of light. The Greek letter omega (), which stands for it. Consequently, the wavelength is the separation between one wave's crest or trough and the following wave.

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Answer:

A farmer with a field of solar panels.

Explanation:

The closest to a locally sources energy would have been

A coal mine located in their county.

But coal as an energy source is not environmentally friendly due to carbon emission, and should not be what the group should advocate for.

The best bet for them is

A farmer with a field of solar panels.

As solar panels are a source of green energy and green energy is what the environmental group should often and always advocate for

Answer:

Option B. Decreases

Explanation:

Coulomb's law states that:

F = Kq₁q₂ / r²

Where:

F => is the force of attraction between two charges

K => is the electrical constant.

q₁ and q₂ => are the two charges

r => is the distance apart.

From the formula:

F = Kq₁q₂ / r²

The force of attraction (F) is inversely proportional to the square of their separating distance (r).

This implies that as the distance between them increase, the force of attraction between the two charges will decrease and as the distance between two charges decrease, the force of attraction between them will increase.

Considering the question given above and the illustration given above, the force of attraction will decrease as their distance of separation increases.

Option B gives the right answer to the question.

The final velocity of both the balls after collision is 2.17m/s and direction of movement is 45°.

mass of the the first clay ball = 28gm =0.028 kg

initial velocity of the first clay ball = u1 =3.4m/s

mass of the the second clay ball = 34gm =0.034g

initial velocity of the second clay ball = u2= 2.8m/s

Now, Initial momentum of the first ball: p1 = m1 × u1

p1 = (0.028)(3.4)

p1 = 0.0952 kg-m/s

Initial momentum of the second ball: p2 = m2 × u2

p2 =(0.034)(2.8)

p2 = 0.0952 kg-m/s

Resultant of initial momentum of both the balls:

Pi = √(Pxi² + Pyi²)

Pi = √{(0.0952)² + (0.0952)²}

Pi = 0.1346 kg-m/s

Finding final velocity by applying conservation of momentum-

Pi = Pf

mv = 0.1346

v = 0.1346 / 0.062

v = 2.17 m/s

Finding direction of the two balls's velocity-

tanθ = Pyi/Pxi

tanθ = 0.0952/0.0952

tanθ = 1

θ = 45°

Therefore, the final velocity of both the balls after collision is 2.17m/s and direction of movement is 45°.

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Explanation:

Work = power × time

W = (6000 W) (7.5 s)

W = 45,000 J

Answer:

the ball is travelling very fast and the player can get injured if he doesn't wear gloves

Explanation:

The acceleration of earth's moon relative to the earth is  toward the earth. Option B

We know that the term acceleration has to do with the way that the velocity of a body does change with time. We know that the earth is a long and a large gravitational field. We know that all the masses that are in the universe are attarcted to the center of the earth by the gravitational force.

In this case, the force that is able to cause the acceleration is the gravitational force and the acceleration that is imparted by the force is what we call the acceleration die to gravity of the object that is in question.

We know that the fact that the gravitational force is an attractive force implies that the force does exist between the moon and the earth.

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The image formed at the distance between the masquerade dancers and the man is -0.25m. The negative sign indicates the image is a virtual image.

A mirror is a reflective surface that includes the light that bounces back the light. The mirror produces a real and a virtual image. When an object is placed in front of a mirror, the image is produced in the mirror. The image is formed from the reflected rays from the object when light falls on it.

From the given,

the distance between the masquerade dancers (Do) = 6m

The mirror is placed at a distance from man = 0.25m

The image is formed between the man and dancers, Di = -Do

Di = -Do

   = -0.25 m

The image formation from an object is - 0.25 m and the negative sign indicates the image is a virtual image.

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Answer:

vaporation

Explanation:

latent heat also called the heat of vaporization is the amount of energy necessary to change a liquid to a vapour at constant temperature and pressure.

The vector (2, y) has an x-component with a length of 2.

A vector with an x-component of length 2 can be represented as:

Vector V = (2, y)

In this representation, the x-component of the vector is 2, and the y-component can have any value since it was not specified.

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Answer:

0.375 N

Explanation:

1250 * 3 mm^2 =0.375 N

Answer:

Exactly 0.03042 carbon-14 is remaining.

Roughly 0.03 Carbon-14 is remaining. (When/If Multiple Choice)

Explanation:

Not a physics question, this is chemistry, but I'll answer.

First, divide 17,000/5700 to find the t, or time.

t = 2.98245614 or 2.98.

If it originally contained .24 grams, and a half life means x/2,

you would use the formula x/2^p, with p being the number of half lives

(these variables are made up, you can use any you would like)

In 17,000 years, the palm fossil experienced 2.98 half lives.

Thus meaning, using our equation, we would find (.24)/2^2.98

This equals 0.030418784 carbon-14 remaining to be exact.

(For Multiple Choice, it may be required to round to For Multiple Choice, it may be required to round to 3, so .24/2/2/2 or .24/2=.12 then .06 then it equals :  .03 Carbon-14)

If the oscillation amplitude is 0.22m, from a 0.29kg harmonic oscillator which has a total of mechanical energy 3.6j, the oscillation frequency is 4.141Hz.

It is a number of oscillations in the one-time unit, says per second. For example, a pendulum that takes 0.5s to make one full oscillation has a frequency of 1 oscillation per 0.5s or 2 oscillations / second.

How to calculate the oscillation frequency?

mass (m) = 0.29kg

Total energy (E) = 3.6j

amplitude (x) = 0.22m

E = 1/2 k*x^2

k = 2*E / x^2

= 2 * 3.6 / 0.22^2

= 148.76 N/m

Frequency (v) = 1/2π √k/m

= 1/2*3.14 * √148.76 / 0.22

= 4.141Hz

Therefore, the oscillation frequency is 4.141Hz.

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Insufficient magnetic field strength, misaligned magnet and coil configuration, inadequate coil design, or insufficient voltage/current can all contribute to the LED bulb not shining when a magnet is spinning within a coil of wire.

There are a few possible reasons why the LED bulb may not shine when a magnet is spinning within a coil of wire connected to it:

1. Insufficient magnetic field strength: The spinning magnet may not generate a strong enough magnetic field to induce a significant current flow in the wire coil. The LED bulb requires a certain minimum current to illuminate, and if the magnetic field is weak, it may not generate enough current to power the LED.2. Incompatible magnet and coil configuration: The magnet's orientation or position relative to the coil may not be aligned properly. For efficient induction, the magnetic field lines need to intersect the coil perpendicularly. If the magnet is misaligned or too far away, the induction may be weak or non-existent, resulting in the LED bulb not lighting up.

3. Inadequate coil design: The coil of wire itself may not be designed optimally for efficient induction. Factors such as the number of turns, wire gauge, and coil size can affect the induction process. If the coil is not constructed properly, it may hinder the generation of sufficient current to illuminate the LED bulb.

4. Insufficient voltage or current: Even if there is some induction occurring, the voltage or current generated in the coil may not be enough to power the LED bulb. LEDs typically require a specific voltage and current range to operate correctly, and if the generated electrical energy falls below these thresholds, the LED may not shine.

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The free body diagram of the crate can be shown as,

Here, N is the normal force acting on crate, mg is the weight of crate, f is the frictional force and theta is the angle of inclination of plane.

Answer:

Reaction force

Explanation:

According to Newton's third law of motion, for every action, there is an equal opposite reaction.

Hence the reaction force is often equal in magnitude to the applied force but acts in a direction opposite to the direction of the applied force.

Hence, when a baseball player, gets a hit, the ball exerts a reaction force on the player which is equal in magnitude to the force with which the player hits the ball but opposite in direction.

The total resistance in the circuit is 144Ω, and the total current is approximately 0.694A.

To find the total resistance and total current in the given circuit, let's break down the steps:

1. Delta to Wye Transformation:

  - Identify the resistors in the delta configuration: 200Ω, 40Ω, and 120Ω.

  - Apply the delta to wye transformation to convert the resistors into a wye configuration:

    - R₁ = (Rb * Rc) / (Ra + Rb + Rc) = (40 * 120) / (200 + 40 + 120) = 16Ω

    - R₂ = (Ra * Rc) / (Ra + Rb + Rc) = (200 * 120) / (200 + 40 + 120) = 96Ω

    - R₃ = (Ra * Rb) / (Ra + Rb + Rc) = (200 * 40) / (200 + 40 + 120) = 32Ω

  - Replace the delta configuration with the wye configuration using the calculated values: R₁ = 16Ω, R₂ = 96Ω, R₃ = 32Ω.

2. Total Resistance Calculation:

  - The total resistance (RT) in the circuit is the sum of the individual resistances:

    - RT = R₁ + R₂ + R₃ = 16Ω + 96Ω + 32Ω = 144Ω.

3. Total Current Calculation:

  - The total current (I) can be calculated using Ohm's Law: I = V / RT, where V is the voltage across the circuit.

  - Given that the voltage (V) is 100V, the total current (I) is: I = 100V / 144Ω = 0.694A.

Therefore, the total resistance in the circuit is 144Ω, and the total current is approximately 0.694A.

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If p < AVC, firms would incur losses, leading them to exit the market, reducing supply, and eventually increasing the market price until p = min ATC is achieved in the long-run equilibrium.

a competitive industry with identical firms, long-run equilibrium is characterized by p = min ATC, where p represents the price and ATC stands for average total cost.

In this situation, firms cannot earn economic profits (p > min ATC) or incur losses (p < AVC, where AVC is average variable cost) in the long run, as the following steps explain:

1. If p > min ATC, firms are earning economic profits, which will attract new firms to enter the market.
2. As new firms enter the market, the supply increases, leading to a decrease in the market price.
3. This process continues until the market price reaches the minimum average total cost (p = min ATC), eliminating economic profits and creating a long-run equilibrium.

Similarly, if p < AVC, firms would incur losses, leading them to exit the market, reducing supply, and eventually increasing the market price until p = min ATC is achieved in the long-run equilibrium.

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The electric field inside and outside a spherical surface of radius a carrying a uniform surface charge density s is given by E = (s * r)/(3ε₀) and E = (q)/(4πε₀r²) respectively.

Inside the sphere, the electric field can be found using Gauss's Law. Since the charge is distributed uniformly on the surface, the total charge q on the sphere is given by q = 4πa²s, where a is the radius of the sphere and s is the surface charge density.

Applying Gauss's Law, we have ∮E⋅dA = (q)/(ε₀), where E is the electric field and dA is a differential area element on the Gaussian surface. As the electric field is constant and perpendicular to the surface at every point, we can simplify the integral to E⋅(4πa²) = (q)/(ε₀). Solving for E, we get E = (q)/(4πε₀a²), which is independent of the distance r from the center.

Outside the sphere, we can again use Gauss's Law with a Gaussian surface enclosing the entire sphere. The electric field is radially directed and has the same magnitude at every point on the Gaussian surface.

Applying Gauss's Law, we have ∮E⋅dA = (q)/(ε₀), where E is the electric field and dA is a differential area element on the Gaussian surface. The charge enclosed within the Gaussian surface is q, so we can rewrite the equation as E⋅(4πr²) = (q)/(ε₀). Solving for E, we get E = (q)/(4πε₀r²), where r is the distance from the center of the sphere.

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An opponent moving at a uniform speed of 4.0 m/s is caught by a hockey player standing on his skates on a frozen pond in 8.20 seconds and distance of  134 metres in that time.

Speed is the amount of distance covered in a given amount of time. It refers to how quickly an object is moving. The magnitude of the velocity vector is a scalar variable called speed. An opponent moving at a uniform speed of 4.0 m/s is caught by a hockey player standing on his skates on a frozen pond in 8.20 seconds and 134 metres in that time. It's unclear where it's going. A higher speed denotes a more rapid pace of movement. Lower speed is a sign of slower motion. If it isn't moving at all, it has no speed.

t = -(-6)+((-6)^2 -(4)(-18^2))^1/2)/2 = 8.20sec

X = 0+1/2(4^2)(8.20^2) = 134m

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Answer:

velocity and mass

Explanation:

Answer:

3 m/s

Explanation:

distance (rise) over time (run) gives speed, that is velocity

it can be found using the gradient (m) formula

m=(y2-y1)/(x2-x1)

m=(15-3)/(4-0) =12/4=3 m/s

Answer:

3 m/s

Explanation:

.....as the answer for your question is 3m/s ..

THANK YOU..

Answer:

hi

Explanation:

Answer:

*  most of the emission would be in the infrared part, the visible radiation would be very small.

*total intensity of the semition decreases that the intensity depends on the fourth power of the temperature

Explanation:

The radiation emitted by the Sun is approximately the radiation of a black body, if the Sun were to cool, the maximum emission wavelength changes

          λ T = 2,898 10⁻³

          λ = 2,898 10⁻³ / T

if the temperature decreases the maximum wavelength the greater values ​​are moved, that is to say towards the infrared. Therefore the emission curve also moves, in this case most of the emission would be in the infrared part, the visible radiation would be very small.

Furthermore, the total intensity of the semition decreases that the intensity depends on the fourth power of the temperature according to Stefan's law

           P = σ A eT⁴

Answer:

f =-20 cm

Explanation:

Given that,

The magnification of a spherical mirror, m = -1

The image distance, v = 40 cm (for negative magnification)

The magnification of a concave mirror is negative. The mirror showing -1 magnification is a concave mirror.

Let f be the focal length of the mirror. We know that,

\(m=\dfrac{-v}{u}\\\\-1=\dfrac{-v}{u}\\\\v=u\)

Object distance, u = -40 cm

Using mirror's formula i.e.

\(\dfrac{1}{f}=\dfrac{1}{u}+\dfrac{1}{v}\\\\f=\dfrac{1}{\dfrac{1}{-40}+\dfrac{1}{-40}}\\\\f=-20\ cm\)

So, the focal length of the mirror is 20 cm.

The least possible uncertainty in a measurement of the speed of an electron in an atom of lead, expressed as a percentage of the average speed, is approximately 0.85%.

The uncertainty in the measurement of the speed of an electron can be determined using the Heisenberg uncertainty principle, which states that there is a fundamental limit to the precision with which certain pairs of physical properties, such as position and momentum, can be known simultaneously. Mathematically, the uncertainty principle is expressed as:

\(\(\Delta x \cdot \Delta p \geq \frac{h}{4\pi}\)\)

where \(\(\Delta x\)\) is the uncertainty in position, \(\(\Delta p\)\) is the uncertainty in momentum, and h is the reduced Planck's constant.

In this case, we are interested in the uncertainty in the speed of the electron, which is related to its momentum. The momentum of an electron can be approximated as \(\(p = m \cdot v\)\), where m is the mass of the electron and v is its velocity. Since the mass of the electron remains constant, the uncertainty in momentum can be written as:

\(\(\Delta p = m \cdot \Delta v\)\)

To find the uncertainty in velocity, we can rearrange the equation as:

\(\(\Delta v = \frac{\Delta p}{m}\)\)

Now, we can substitute the values given in the problem. The mass of an electron is approximately \(\(9.10938356 \times 10^{-31}\)\) kg, and the average orbital speed is \(\(1.8 \times 10^8\)\) m/s. The uncertainty in velocity can be calculated as:

\(\(\Delta v = \frac{\Delta p}{m} = \frac{\frac{h}{4\pi}}{m} = \frac{h}{4\pi \cdot m}\)\)

Substituting the known values, we get:

\(\(\Delta v = \frac{6.62607015 \times 10^{-34}}{4\pi \cdot 9.10938356 \times 10^{-31}} \approx 2.20 \times 10^{-3}\) m/s\)

Finally, we can express the uncertainty in velocity as a percentage of the average speed:

\(\(\text{Uncertainty \%} = \frac{\Delta v}{\text{Average speed}} \times 100 = \frac{2.20 \times 10^{-3}}{1.8 \times 10^8} \times 100 \approx 0.85\%\)\)

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Option A. The absolute brightness of a star depends on its size and temperature

The absolute brightness of a star is the amount of light it emits at a standard distance from Earth, regardless of how far away it actually is.

The size and temperature of a star are the primary factors that determine its absolute brightness. The size of the star affects the amount of light it emits, with larger stars emitting more light. The temperature of a star affects the color of the light it emits, with hotter stars emitting bluer light and cooler stars emitting redder light. Both of these factors play a significant role in determining a star's absolute brightness.

Distance and color can also affect a star's brightness, but in different ways. The distance of a star affects its apparent brightness as seen from Earth, but not its absolute brightness. The color of a star can provide information about its temperature and composition, but does not directly determine its absolute brightness.

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