Electrons are emitted form a certain metal with a maximum kinetic energy of 2 eV when 6-eV photons are inicident on its surface. What is the maximum kinetic energy of electrons emitted if photons of twice the wavelength are inicdent on this metal? Explain your answer

The true total mass of a galaxy cluster is much greater than the mass measured by adding up all the stars in all the galaxies of the cluster.


This is because the majority of the mass in a galaxy cluster is actually in the form of dark matter, which cannot be detected through traditional methods like observing stars. Dark matter is a mysterious substance that interacts only through gravity and is thought to make up about 85% of the matter in the universe.

Therefore, the true total mass of a galaxy cluster is much higher than what is visible through telescopes. Scientists use a variety of methods, such as gravitational lensing and the motions of the galaxies within the cluster, to estimate the amount of dark matter present and thus determine the true mass of the cluster. Understanding the distribution and amount of dark matter in galaxy clusters is an important part of studying the large-scale structure of the universe.

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Answer:

It depends...

Explanation:

If you know how much watts the pair of hair straighteners use, you can use that as the energy every second. A normal flat iron for hair would be 300 watts, so we could say that it uses 300 jolts or watts of energy per second.

Answer:

The final graph

Explanation:

The graph that curves downwards is negative acceleration. While the position decreases the slop increases.

Answer:

1. Beryllium

2. 4

3. 9

4. 0

Explanation:

• The element shown in the image is beryllium because the atom shown contains four protons and the only element with four protons is beryllium.

• The atom's atomic number is 4, because atomic number is the number of protons of an element, and the atom shown contains 4 protons.

• The mass number of the atom is 9. Mass number is the sum of the number of protons and neutrons in the nucleus of an atom, and the atom shown contains 4 protons and 5 neutrons; therefore its mass number is (4 + 5 =) 9.

• The charge of the atom is 0. This is because it has 4 protons which give it a +4 charge, but it also has 4 electrons which give it a -4 charge. Therefore its net charge is: 4 + (-4) = 0.

Answer:

Which month has the longest daytime? shortest daytime?

Explanation:

Answer:

1200

Explanation:

f=ma

f_ force

m_ mass

a_ acceleration

Answer:

1560 m

Explanation:

Constant velocity of 120m/s for 8 seconds is 120 x 8 = 960, but it was already 600 m above ground so 960 + 600 = 1560 m.

Answer:

Comprobar explicación

Explanation:

Si el árbitro toma una decisión en el medio del juego, a pesar de estar equivocado, normalmente, como humano, las emociones están destinadas a superarlo, pero de acuerdo con el reglamento, hay conductas aceptables y una protesta llena de emociones. en el árbitro puede salirse de las manos y conducir a más castigos de acuerdo con los libros de reglas.

Después del partido, por lo general, aún me despediría y expresaría mi desagrado tan cortésmente como pueda, pero porque cuando uno se equivoca, las emociones que lo acompañan pueden volverse increíblemente incontrolables, por lo tanto, es mejor mantener el control y no obtener castigado aún más.

¡¡¡Espero que esto ayude!!!

To find an, we can take the cross product of the velocity vector (v(t)) and the acceleration vector (a(t)) and divide by the magnitude of the velocity vector (|v(t)|): an = |v(t) × a(t)| / |v(t)|

To find the tangential and normal components of the acceleration vector, we first need to find the acceleration vector. Given that R(t) = 7t i cos^2(t) j sin^2(t) k, we can differentiate it twice with respect to time to obtain the acceleration vector.

First, we differentiate R(t) with respect to time:
v(t) = dR(t)/dt = 7 i cos^2(t) j sin^2(t) k + 7t (-sin^2(t)) j sin(2t) k + 7t cos^2(t) j cos(2t) k

Next, we differentiate v(t) with respect to time to find the acceleration vector:
a(t) = dv(t)/dt = 14 i cos^2(t) j sin^2(t) k + 7 (-sin^2(t)) j sin(2t) k + 7t (-sin^2(t)) (-sin(2t)) k + 7t cos^2(t) j (-2sin(2t)) k + 7t cos^2(t) j cos(2t) k + 7t (-sin^2(t)) j (-sin(2t)) k + 7t cos^2(t) (-2sin(2t)) k + 7t cos^2(t) j (-sin(2t)) k + 7t cos^2(t) j cos(2t) k

Now that we have the acceleration vector, we can find the tangential and normal components. The tangential component (at) is the component of the acceleration vector in the direction of the velocity vector, while the normal component (an) is the component perpendicular to the velocity vector.

To find at, we can take the dot product of the acceleration vector (a(t)) and the unit vector in the direction of the velocity vector (v(t)/|v(t)|):
at = a(t) · (v(t)/|v(t)|)

To find an, we can take the cross product of the velocity vector (v(t)) and the acceleration vector (a(t)) and divide by the magnitude of the velocity vector (|v(t)|):
an = |v(t) × a(t)| / |v(t)|

I apologize, but the given terms "at" and "an" are not clear in the question. However, you can use the above methods to find the tangential and normal components of the acceleration vector.

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Answer:

none

Explanation:

~both of them show to the nearest metre.

~millimeter has (mm) unit eg 0.7mm

0.76cm is the correct answer

bcoz after Mili metre there is centi metre so option c is correct

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Answer:

v = 4.79 10³ m / s

Explanation:

For this exercise we will use the universal law of gravitation and Newton's second law

          F = G M m / r²

where G is the gravitational constant, m the mass of the satellite, M the mass of the Earth, r the distance from the center of the planet to the satellite

           F = m a

since the satellite has a circular path, the acceleration is centripetal

          a = v² / r

we substitute

          G M m / r² = m v² / r

           G M / r = v²

We calculate

          v² = 6.67 10⁻¹¹ 5.98 10²⁴ / 6.96 10⁶

          v = √ (22.94 10⁶)

          v = 4.79 10³ m / s

Answer:

7570 m/s

Explanation:

take the square root of: 6.67E-11× 5.98E24/6.96E6

Answer:  By multiplying mass by velocity

Explanation:  By multiplying mass by velocity

A force of 15 Newton stretches a spring to a total length of 30 cm and an additional force of 10 Newton's stretches to a Spring of 5 cm, the natural length of the spring is 58.5 cm

To find the natural length of the spring, we can use Hooke's law, which states that the force applied to a spring is directly proportional to the displacement of the spring from its natural length.

Let's denote the natural length of the spring as L.

According to the problem, a force of 15 Newton stretches the spring to a total length of 30 cm. This means that the displacement of the spring is 30 cm - L.

Using Hooke's law, we can set up the following equation:

Force = k * Displacement

where k is the spring constant.

For the first scenario, we have:
15 N = k * (30 cm - L)

Next, we are given that an additional force of 10 Newton's stretches the spring to a length of 5 cm. This implies that the displacement of the spring is 5 cm - L.

Using Hooke's law again, we can set up the following equation:

10 N = k * (5 cm - L)

Now we have two equations:

15 N = k * (30 cm - L)
10 N = k * (5 cm - L)

We can solve this system of equations to find the value of L, the natural length of the spring.

By dividing the second equation by 10, we get:

1 N = k * (0.5 cm - 0.1L)

Rearranging the equation, we have:

1 N = 0.5 k - 0.1kL

Now, let's substitute the value of k from the first equation into this equation:

1 N = 0.5 (15 N / (30 cm - L)) - 0.1 (15 N / (30 cm - L)) * L

Simplifying the equation, we get:

1 = 0.75 / (30 cm - L) - 1.5L / (30 cm - L)

Combining the terms on the right side of the equation, we have:

1 = (0.75 - 1.5L) / (30 cm - L)

Cross-multiplying, we get:

30 cm - L = 0.75 - 1.5L

Simplifying the equation, we have:

L - 1.5L = 0.75 - 30 cm

Combining like terms, we get:

-0.5L = -29.25 cm

Dividing both sides of the equation by -0.5, we get:

L = 58.5 cm

Therefore, the natural length of the spring is 58.5 cm.

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Geothermal energy is heat that occurs deep within the earth. Geothermal energy is a clean, renewable resource that can be used for heat and electricity.

Humans can harvest geothermal energy in the following ways. A geothermal power plant uses heat from deep underground to generate steam and generate electricity. Geothermal heat pumps use heat from near the surface to heat water or heat buildings. Geothermal power plants uses the steam to generate electricity. The steam comes from reservoirs of hot water several miles or more underground. The steam spins turbines and drives generators to generate electricity. These are the features of geothermal energy within the earth.

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The initial velocity of the sled will be 7.34 m/sec. V is the initial velocity of the sled.

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

The given data in the problem is;

(m₁)  mass of child = 38 kg

(u₁) is the initial velocity child = 2.2 m/s

(m₂) is the mass of sled = 68 kg

(u₂) is the initial velocity of sled = ?

(v) is the velocity after collision = 5.5 m/s

According to the law of conservation of momentum;

Momentum before collision =Momentum after collision

\(\rm m_1u_1 + m_2u_2 = v(m_1 + m_2)\\\\(38 \times 2.2) + (68 \times V) = 5.5 \times (38+68) \\\\ 83.6 + 68V = 5.5 \times 106 \\\\ 83.6 + 68V =583 \\\\ \rm 68\ V= 583 -83.6 \\\\ \rm 68 \ V= 499.4\\\\ V= 7.34 \ m/sec\)

Hence,the initial velocity of the sled will be 7.34 m/sec.

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The new electrostatic force between the charges, given that q₁ is reduced to 1/2q₁ and q₂ is tripped is 3/2Fₑ (Option C)

First, we shall determine the initial electrostatic force between the charges. Details below:

F = Kq₁q₂ / r²

Fₑ = Kq₁q₂ / r²

Finall, we shall determine the new electrostatic force. The is illustrated below:

F = Kq₁q₂ / r²

F = (K × 1/2q₁ × 3q₂) / r²

F = 3/2Kq₁q₂ / r²

But,

Fₑ = Kq₁q₂ / r²

Thus

F = 3/2Fₑ

Thus, we can conclude that the new electrostatic force is 3/2Fₑ (Option C)

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-- impurities in the water

-- air pressure is higher than standard

The value of the resistor is 24Ω.

A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance. Resistors have a variety of purposes in electronic circuits, including lowering current flow, adjusting signal levels, dividing voltages, biassing active components, and terminating transmission lines.

We are given that,

Voltage = δv =8v

Current = i =6a

So that , the resistance can be calculated by the formula by,

R = Vi

R = 8v × 6a

R = 24 Ω

Therefore , the of resistor would be 24Ω.

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Answer: Force

In physical science, a force is something that acts on an object by pushing or pulling it. If the force is strong enough, it changes the position or shape of the object. Forces such as friction, air resistance and simple physical contact touch the object directly, while forces like gravity, magnetism and electrostatics act on the object from a distance. Force is a vector quantity, meaning you can measure both its strength and its direction. The formula to find the measure of a force is force = mass times acceleration, written as f = ma.

Velocity

The faster something is moving, the higher its velocity.

When an object is moving, one way to measure how fast it is moving is by finding its velocity, which is the rate at which it is changing position. Like force, velocity is a vector quantity, so it includes direction. To find the average velocity of an object, divide the change in its position by the time the movement took, and state its direction. For example, if a car is driving north and in one hour's time it travels 30 miles, its velocity is 30 miles per hour, north.

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The escape velocity from the white dwarf is approximately 4.12 × \(10^5\) m/s, and the escape velocity from the neutron star is approximately 2.12 × \(10^8\) m/s.

To calculate the escape velocity from a white dwarf and a neutron star, we can use the escape velocity formula:
\(v_{escape\) = √(2 * G * M / R)
where \(v_{escape\) is the escape velocity,
G is the gravitational constant (approximately 6.674 × \(10^{-11} m^3 kg^{-1} s^{-2}\)),
M is the mass of the celestial body (in this case, 1 solar mass, which is approximately 1.989 × \(10^{30\) kg), and
R is the radius of the celestial body.

For the white dwarf with a radius of \(10^4\) kilometers (or 1 × \(10^7\) meters):
\(v_{escape\) = √(2 * (6.674 × \(10^{-11} m^3 kg^{-1} s^{-2}\)) * (1.989 × \(10^{30\) kg) / (1 × \(10^7\) m))
\(v_{escape\) ≈ 4.12 × \(10^5\) m/s

For the neutron star, we need its radius. However, since the radius is not provided in the question, I'll assume a typical value for a neutron star's radius, which is about 10 kilometers (or 1 × \(10^4\) meters):
\(v_{escape\) = √(2 * (6.674 × \(10^{-11} m^3 kg^{-1} s^{-2}\)) * (1.989 × \(10^{30\) kg) / (1 × \(10^4\) m))
\(v_{escape\) ≈ 2.12 × \(10^8\) m/s

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Answer:

Hi! can you give me BRAINLIEST ANSWER please.

I would appreciate it

The divers final speed before hitting the bottom is 14.0 m/s.

The time taken for the skydiver to fall from the given height affects the  final velocity  of the diver and it is calculated by using the following kinematic equation.

v² = u² + 2gh

where;

Substitute the given parameters and solve for the final velocity.

v² = 0 + 2gh

v = √2gh

v = √(2 x 9.8 x 10)

v = 14.0 m/s

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Answer:

If an object has a fast velocity, the dots on a ticker tape diagram will be far apart.

The wild offers more natural structures and temperatures that keep animals adapted to their surroundings. However, in captivity animals tend to differ from their wild counterparts. For one thing, the wild cultivates an animal's hunting skills but, when or if they are releasing into the wild, they do not know what to do whereas they have been sheltered their entire life. They don't know how to find natural structures to keep warm in, what places are safe or even survival strategies. The conditions in the wild teach an animal to survive while the conditions from man-made structures just give them an easy survival.

Hope this helps and have a nice day.

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The main answer for the question is that the magnitude of the force associated with the potential energy function is zero at a distance of 10m from the object's initial position. The explanation for the answer is given below.When an object moves, it possesses the potential to do work because of its position relative to other objects.

Potential energy is the energy that is stored in an object due to its position in a gravitational field or due to its deformations and configuration. The potential energy is often referred to as gravitational potential energy because of the gravitational force that it has.A potential energy function is a mathematical formula that describes the amount of potential energy that a system possesses at any given time.

The formula for potential energy is P.E. = mgh where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object above a reference point.In the given problem, we are given that the object has moved a distance of 10m from its initial position. However, we are not given the mass or height of the object, which is needed to calculate the potential energy function. Therefore, we cannot calculate the magnitude of the force associated with this potential energy function.Therefore, the main answer to the problem is that the magnitude of the force associated with the potential energy function is zero at a distance of 10m from the object's initial position.

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Firefighter can hit with water while standing at distance of 153 m from building.

The projectile travels the path with a parabolic trajectory due to the effect of gravity. No horizontal forces so there is no horizontal acceleration.

The velocity of a projectile has horizontal component and the vertical component.

The vertical component of the velocity, \(\displaystyle V_y = Vsin\theta\)

The horizontal component of the velocity, \(\displaystyle V_x = Vcos\theta\)

Given the angle θ with the X- axis = 40°

The velocity of the stream V = 39 m/s

The Y component of the velocity, Vy = 39× sin 40°

Vy = 25.1 m/s

The X component of the velocity, Vx = 39× cos 40°

Vx = 29.88 m/s

The time , t = Vy/g = 25.2/9.8 = 2.56 sec

The distance from the building, \(x = V_x\times 2t\)

x = 29.88 ×2×2.56

x = 153 m

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According to Newton's law, the greater the mass of the object, the greater force will be required.

The mass of the bowling ball is more than that of the tennis ball.

Thus, the bowling ball requires more force.