The work function of a material refers to the minimum energy required to remove an electron from the material. Assume that the work function of tantalum is 4.22 eV and that of barium is 2.50 eV. Calculate the maximum wavelength of light for the photoelectric emission of electrons for tantalum and barium.​

The density of the liquid in the drum is 459.184 kg/m³.

To find the density of a liquid, we must know its pressure, the depth to which it is filled, and the gravitational acceleration acting on it. Using the equation for pressure at a depth h below the surface of a liquid in a container of height H, P = ρgh, where P is the pressure, ρ is the density, g is the gravitational acceleration, h is the height of the liquid, and H is the height of the container.Let's substitute the given values in the above formula:P = 9000800 Pa; h = 2m; g = 9.8m/s²Therefore, ρ = P/gh = 9000800/(9.8 × 2) ≈ 459184.

This means that the density of the liquid in the drum is 459.184 kg/m³ (kilograms per cubic meter).

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Based on the weight of the objects in the water, the water level in the given scenario is as follows;

The rise or fall of a fluid when an object is placed in it is determined by the density, mass, and volume of the object.

According to Archimedes' principle, the upthrust or upward force acting on a body fully or partially  immersed in a fluid, is equal to the weight of the fluid displaced.

Considering the given situations:

In conclusion, the rise in water level depends on the weight of the objects.

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Answer:

We can conclude by saying that in the beginning current will increase but after sometime, it becomes saturated.

Explanation:

Note: No information on change in number of electron generated.

Since there is a collision, the electrons emitted will not reach the collector at same time. As the voltage is increased, the the speed with which the electrons will reach the collector starts to increase. Due to this, electric current will first increases till all the emitted electrons reach the collector. Since we are not provided with the information that number of electrons generated are changing, after increasing voltage current will increase for some time and then reaches a saturated state.

We can conclude by saying that in the beginning current will increase but after sometime it becomes saturated.

A car of mass 1364 kg which is moving at a constant velocity of 23 m/s then the net force acting on the car is 31,372 N.

In physics, a strain is an effect with the ability to alter the velocity of an object. A force can influence a surplus object's velocity to alter or rise. To describe force, a pushing or a pulling makes intuitive sense. Forces have both size and direction, since they are vector quantities. It is measured in newtons using the SI system (N). F is the symbol that denotes force.

Given data provided by the question,

Mass, m = 1364 kg and,

Velocity, v = 23 m/s

Force, F = 1364 × 23

F = 31,372 N.

Therefore, the force is 31,372 N.

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Answer:

O pH is a measure of the concentration of H+ ions in a solution of an acid or base. The pH plots

the concentration of solutions in a range from 0-14.

Explanation:

pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral.

a) The average force with which the woman pushed the man is 210 N.

b.  the woman's recoil speed is still 3.68 m/s

c.  If  she now throws her 2.50-kg purse at him at a 20.0° angle, the speed is 0.

We first calculate  the Momentum  = (70.0 kg)(-1.50 m/s) + (55.0 kg)(v) + (2.50 kg)(-1.50 m/s)

0 = (70.0 kg)(0 m/s) + (55.0 kg)(v) + (2.50 kg)(-1.50 m/s) - (70.0 kg)(-1.50 m/s)

v = 3.68 m/s

Δp = (70.0 kg)(1.50 m/s) - (70.0 kg)(0 m/s) = 105 kg·m/s

The average force exerted on the man by the woman is:

Average force =   Δp / Δt

Average force  = 105 kg·m/s / 0.500 s

Average force  = 210 N

b) The woman's recoil speed is :

0 = (70.0 kg)(-1.50 m/s) + (55.0 kg)(v) + (2.50 kg)(-1.50 m/s)

v = 3.68 m/s

c) If the woman throws her 2.50-kg purse at the man at a 20.0° angle, we apply the conservation of momentum equation in two dimensions and get the speed as 0.

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Answer:

potential energy is stationary, with stored energy to be released; kinetic energy is energy in motion, actively using energy for movement.

Explanation:

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Answer:

Let lo be the length of the rod in the frame in which it is at rest and s' is the frame which is moving with a speed 0.8c in a direction making an angle 60° with x-axis. The components of lo along and perpendicular to the direction of motion are lo cos 60° and lo sin 60° respectively.

Now length of the rod along the direction of motion

= lo cos 60°_/1-(0.8) 2/c2

= lo/2×0.6

= 0.3 lo.

Length of the rod perpendicular to the direction of motion.

= lo sin 60°

=_/3/2 lo

Length of moving rod

l = [(0.3lo)2+{lo_/3/2} 2] 1/2

= 0.916 lo.

Percentage contraction

= lo-0.916lo/lo×100

= 8.4%.

Explanation:

Answer:

Therefore, the GPE of the fish from the given height is 26.19 J.

Explanation:

The gravitational potential energy (GPE) of an object at a height h is given by the formula:

GPE = mgh

where m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object.

In this case, the mass of the fish is 0.3 kg, the height from which it was dropped is 9 meters, and the acceleration due to gravity on Earth is approximately 9.81 m/s². Thus, the GPE of the fish can be calculated as:

GPE = (0.3 kg) × (9.81 m/s²) × (9 m) = 26.19 J

Therefore, the GPE of the fish from the given height is 26.19 J.

I like puffins

Answer:

Explanation:

The formula for angular momentum is

L = mvr where L is the angular momentum, m is the mass of the object, v is the velocity of the object, and r is the radius of the object. The problem we have that prevents us from just throwing those numbers in there is that mass has to be in kg and it's not, and radius has to be in meters and it's not.

Changing the mass to kg:

750 g = .750 kg

Changing the radius to m:

35 cm = .35 m

Now we can fill in the variables with their respective values:

L = .750(10.0)(.35) gives us

\(L=2.625\frac{kg*m^2}{s}\)

Answer:

Quarks

Quarks are among the smallest particles in the universe, and they carry only fractional electric charges. Scientists have a good idea of how quarks make up hadrons, but the properties of individual quarks have been difficult to tease out because they can't be observed outside of their respective hadrons.

Answer:

Quarks

Quarks are among the smallest particles in the universe, and they carry only fractional electric charges. Scientists have a good idea of how quarks make up hadrons, but the properties of individual quarks have been difficult to tease out because they can't be observed outside of their respective hadrons.

The magnitude of the force P provided that the stress in the part AB is two times that of BC part is 0.8 kN.

The magnitude of the force P provided that the stress in the part AB is two times that of BC part is calculated as follows;

Take moment about the joint to determine the magnitude of the force along part BC.

120 kN x 750 mm  =  F x 1000 mm

F = ( 120 kN x 750 mm ) / ( 1000 mm )

F = 90 kN

Stress is given as force divided by area. The following equation can be used to determine the magnitude of force P.

Stress in AB = 2 times stress in BC

P/A₁  = 2F/A₂

where;

A₁ =  πd²/4  =  π(50 x 10⁻³)²/4

A₁ = 1.96 x 10⁻⁵ m²

A₂ = πd²/4  =  π(75 x 10⁻³)²/4

A₂ = 4.42 x 10⁻³ m²

P/A₁ = 2F/A₂

P = (2F x A₁) / (A₂)

P = (2 x 90 kN x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = (2 x 90,000 N x 1.96 x 10⁻⁵ m² ) / ( 4.42 x 10⁻³ m² )

P = 798.2 N

P = 0.798 kN

P ≈ 0.8 kN

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The glycerin index predicts the way certain foods affect​ the blood glucose.

The glycemic index is a numerical scale that ranks carbohydrates in foods based on how they affect blood glucose levels compared to a reference food, typically pure glucose  or white bread. Foods with a high glycerin index cause rapid increase in blood sugar levels, while foods with a low glycerin index result in a slower and more gradual increase.

The glycerin index is often used as a tool for managing blood sugar levels, particularly in individuals with diabetes. Foods with a lower glycerin index are generally considered healthier as they provide more sustained energy and have a lesser impact on blood sugar levels.

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The final pressure in the container will be 2P. The correct answer is a)

According to Boyle's Law, at a constant temperature, the product of pressure and volume of a gas is constant. Therefore, if the volume is reduced to half, the pressure must double to maintain the constant product of pressure and volume.

Mathematically, we can represent this as P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume. Since the volume is reduced to half (V2 = V1/2), the final pressure (P2) must be twice the initial pressure (P1).

Therefore, the final pressure is 2P. The answer is (a).

Note that the value of n (number of moles) and T (temperature) are not relevant to the solution, as the problem statement specifies that they remain constant during the process.

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The change in the electric potential of the charge is 324,000 V.

The change in the electric potential is the change in the work done in moving the charge between the two points.

Mathematically, the formula for change in electric potential is given as;

ΔU = kq ( 1/r₁ - 1/r₂ )

where;

ΔU = ( 9 x 10⁹ x 12 x 10⁻⁶ ) ( 1/0.2 - 1/0.5)

ΔU = 324,000 V

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Answer:

A. Reversibility

Explanation:

Because if you don't progress then you do the opposite, you reverse.

Sorry if my explanation is confusing it made sense in my head i just didn't know how to put it.

hope this help. ;)

Answer:

A. Reversibility

Explanation:

Answer:

1836 N

Explanation:

Given that

Initial speed = 86 km/h

Total distance = 47 m

Mass of the car = 1210 kg

The steps are captured in the calculation attached.

The correct statement is Molecular collisions transfer thermal energy between the system and its surroundings. Thus, option D is correct.

The energy moves between a system of reacting substances and the surroundings by the collision of molecules. The transfer of heat or thermal energy between the system and its surroundings by the process of Conduction. Conduction is the process of transmitting the heat to the neighboring atoms or collisions by the process of collisions.

The conduction takes place more steadily in solids and liquids where the molecules are closer together. When the molecules are collided with the nearby molecules, the potential energy is converted into kinetic energy and hence the heat energy is transferred between the system and its surroundings.

Hence, Molecular collisions transfer thermal energy between the system and its surroundings. Thus, the correct option is D.

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The second step of the scientific method is to form a hypothesis. Thus, the correct option for this question is A.

A scientific method may be defined as the complete procedure through which the objectives of any experiment are established facts through testing and experimentation. There are numerous steps of the scientific method exist.

The basic steps of the scientific methods are as follows:

It is a systematic and well-regulated approach that involves in obtaining information about a scientific nature or obtaining a desired material or product.

Therefore, the second step of the scientific method is to form a hypothesis. Thus, the correct option for this question is A.

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Based on the given diagram, we can only reasonably conclude statement c, that the upper plate is positive and the lower plate is negative

What is Electric Field?

Electric field is a concept used in physics to describe the influence that an electric charge exerts on other charges in its vicinity. It is defined as the force experienced by a positive test charge placed in the vicinity of an electric charge, divided by the magnitude of the test charge

The upper plate is positive and the lower plate is negative: This statement is a common convention for charged parallel metal plates in a capacitor. The positive plate is usually considered as the plate with electric field lines originating from it (in this case, the upper plate), and the negative plate is usually considered as the plate with electric field lines terminating on it (in this case, the lower plate). So, this statement is likely to be true based on convention.

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If two gliders of unequal mass, labeled A and B, are on a frictionless air track collides, the magnitude of momentum of A is higher than the magnitude of momentum of B after the collision.

According to law of conservation of momentum,

( pA ) i + ( pB ) i = ( pA ) f + ( pB ) f

( pA ) i = Initial momentum of A

( pB ) i = Initial momentum of B

( pA ) f = Final momentum of A

( pB ) f = Final momentum of B

Since A is initially at rest,

( pA ) i = 0

Taking left as negative and right as positive,

- ( pB ) i = - ( pA ) f + ( pB ) f

- ( pA ) f + ( pB ) f = - ( pB ) i

- ( pA ) f + ( pB ) f < 0 ( Because ( pB ) i is negative )

( pB ) f < ( pA ) f

Therefore, after the collision, the magnitude of momentum of A is higher than the magnitude of momentum of B.

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Answer:  Therefore, the change in entropy when 536 g of gold are melted is 0.132 J/K.

Explanation:  To calculate the change in entropy when 536 g of gold are melted, we need to know the entropy of fusion of gold and the temperature at which it melts.

The entropy of fusion of gold is 2.35 J/g·K, and the melting point of gold is 1064 °C or 1337 K.

The change in entropy when gold is melted can be calculated using the formula:

ΔS = Q/T

where ΔS is the change in entropy, Q is the heat absorbed during the process, and T is the temperature at which the process occurs.

The heat absorbed when gold is melted can be calculated using the formula:

Q = m × ΔH_fus

where m is the mass of the gold and ΔH_fus is the enthalpy of fusion of gold, which is 64.9 kJ/mol.

Converting the mass of gold to moles:

536 g / 196.97 g/mol = 2.72 mol

The heat absorbed by the gold when it is melted is:

Q = 2.72 mol × 64.9 kJ/mol = 176.2 kJ

Finally, we can calculate the change in entropy:

ΔS = Q/T = 176.2 kJ / 1337 K = 0.132 J/K

These two statements are true: the wood's momentum is lower than the bullet's starting momentum, and the total energy is lower than the bullet's original kinetic energy.

Pi = Pf, Pbi+Pwi = Pbf+Pwf, MbVbi+MwVwi = Mb Vbf + Mw Vwf, MbVbi + Mw (0) = (Mb + Mw)Vf, and MbVbi = (Mb + Mw)Vf according to the rule of conservation of linear momentum.

As a result, the bullet's initial momentum is smaller than that of the wood.

Consequently, the appropriate choice is (c).

(2) The formula for kinetic energy is Ki = Pi2/2Mb Kf = Pf2 / 2(Mb + Mw).

By dividing the two energies by their ratio, Kf = (Mb / Mb + Mw)Ki and Kf = Pf2 / 2(Mb + Mw) / Pi2/2Mb.

as a result, the appropriate choice is (a).

According to the rule of conservation of momentum, if two objects collide, the force obtained by one object equals the force lost by one.

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The dome will have approximately 0.1176% more interior space in the summer than it does in the winter.
The dome will have approximately 88.6 m³ more interior space in the summer than it does in the winter.

The dome will have more interior space in the summer due to thermal expansion of the aluminum framework. To calculate the change in volume, we can use the coefficient of thermal expansion for aluminum, which is approximately 2.4 x 10⁻⁵ /°C.

The temperature change from -15°C to 34°C is a difference of 49°C. So, the fractional change in volume is:

ΔV/V = αΔT

ΔV/V = (2.4 x 10⁻⁵/°C) x 49°C

ΔV/V = 0.001176

As a result, the dome will have 0.1176% more internal area in the summer than it does in the winter.

To find the actual change in volume, we can use the formula for the volume of a hemisphere:

V = (2/3)πr³

The diameter of the dome is 58.0 m, so the radius is 29.0 m. Therefore, the volume of the dome is:

V = (2/3)π(29.0 m)³

V = 75344 m³

Increasing the volume by 0.1176% gives us:

ΔV = 0.001176 x 75344 m³

ΔV = 88.6 m³

As a result, the dome will have 88.6 m³ more internal room in the summer than it does in the winter.

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Answer:

Approximately \(0.10\), assuming that \(g = 9.81\; {\rm N\cdot kg^{-1}}\) and a level surface.

Explanation:

Under the assumption, the normal force between the ice and the hockey puck is equal to the weight of the puck:

\(\begin{aligned}m\, g &= (0.16\; {\rm kg})\, (9.81\; {\rm N\cdot kg^{-1}}) \\ &\approx 1.57\; {\rm N}\end{aligned}\).

The friction on the puck is considered "static" when as long as the puck is not moving relative to that surface. In this question, the maximum value of this static friction is \(0.157\; {\rm N}\). When the external horizontal force exceeds \(0.157\; {\rm N}\!\), the puck would start moving relative to the ice.

Divide maximum static friction by the normal force to find the coefficient of static friction:

\(\begin{aligned}\mu_{s} &= \frac{(\text{maximum static friction})}{(\text{normal force})} \\ &\approx \frac{0.157\; {\rm N}}{1.57\; {\rm N}} \\ &\approx 0.10\end{aligned}\).

The statement" The direction of the force on the charge placed in the electric field is upward" is false because the direction of the force on a negative charge (-6 C) placed in an upward-directed uniform electric field of magnitude 24 N/C would be downward.

The direction of the force on a charged particle placed in an electric field is determined by the charge of the particle and the direction of the electric field. In this case, a charge of -6 C is placed in an electric field directed upward with a magnitude of 24 N/C.

The force on a charged particle in an electric field can be calculated using the formula:

F = q * E

Where F is the force, q is the charge of the particle, and E is the electric field.

Since the charge q in this case is negative (-6 C) and the electric field E is directed upward, we can substitute the values into the formula:

F = (-6 C) * (24 N/C)

F = -144 N

The negative sign in the force value indicates that the force is in the opposite direction to the electric field. Therefore, the force on the charge placed in the electric field is downward, not upward.

The force on a negative charge is always opposite to the direction of the electric field. This is because negative charges experience an attractive force towards positive charges, and electric fields are directed from positive charges to negative charges.

Therefore, the statement "The direction of the force on the charge placed in the electric field is upward." is false.

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