how much heat energy is required to vaporize a 1 g ice cube at 0 C. The heat of fusion of ice is 3.36 x 10^5 J/kg . The heat of vaporization of water is 2.26 x 10^6 J/Kg. ( specific heat of water = 4200 J/Kg C )

The magazine rack can turn through 73 degrees without falling over

We know that we can be able to obtain the angle that has been turned when we obtain the tangent of the angle that is made by the direction of the ball.

Now we know that we can be able to get the ange that has been turned when we apply the idrea of a righta ngled triangle. In which case, we would have the following;

Angle turned = tan-1 (16/5)

= 73 degrees

Thus, the angle that is turned is 73 degrees.

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Answer:

The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

Explanation:

The height of the cliff is approximately 248.5 meters. It's important to note that this estimate assumes that air resistance is negligible and that the stone is dropped vertically.

We can use the kinematic equation for the vertical motion of the stone to estimate the height of the cliff:

h = 1/2 * g * t^2

where h is the height of the cliff, g is the acceleration due to gravity (9.81 m/s^2), and t is the time taken for the stone to hit the water.

In this case, the time taken for the stone to drop is 7.1 seconds, so we have:

h = 1/2 * (9.81 m/s^2) * (7.1 s)^2

h = 248.5 meters (rounded to one decimal place)

Therefore, the height of the cliff is approximately 248.5 meters. It's important to note that this estimate assumes that air resistance is negligible and that the stone is dropped vertically. In reality, these assumptions may not hold true, so the actual height of the cliff may be slightly different.

One way to estimate the height of a cliff is to use the fact that sound travels at a fixed speed, which is approximately 343 meters per second at room temperature and standard atmospheric pressure. By measuring the time it takes for a sound to travel from the top of the cliff to the bottom and back up, we can estimate the distance between the top of the cliff and the ground.

However, it can be difficult to produce a sound that is loud enough to be heard at the bottom of a cliff, especially in outdoor settings with a lot of ambient noise. A simple alternative is to use the time it takes for a stone to fall from the top of the cliff to the bottom, and then use the kinematic equations of motion to estimate the height of the cliff.

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Total mass lost by the comet is 30.24 x 10¹⁰ kg.

Rate at which mass is lost, R = 35 x 10⁴ kg/s

Time period, T = 100 days = 8.64 x 10⁶s

Therefore,

Total mass lost by the comet, m = R x T

m = 30.24 x 10¹⁰ kg

So,

The fraction of loss = (30.24 x 10¹⁰)/(5 x 10¹⁵) = 60.48 x 10⁻⁵

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Answer:

Therefore, the 10 kg mass should be placed at x = 5.7 m along the x-axis to achieve a center of mass located at y = 4.5 m.

Explanation:

To find the position along the x-axis where a 10 kg mass should be placed such that the center of mass is located at y = 4.5, we can use the formula for the center of mass:

x_cm = (m1 * x1 + m2 * x2) / (m1 + m2)

Here, m1 and x1 represent the mass and position of the 8 kg mass, respectively. m2 is the mass of the 10 kg mass, and we need to find x2, its position.

Given:

m1 = 8 kg

x1 = 3 m

x_cm = unknown (to be found)

m2 = 10 kg

y_cm = 4.5 m

Since the center of mass is at y = 4.5, we only need to consider the y-coordinate when calculating the center of mass position along the x-axis.

To solve for x2, we can rearrange the formula as follows:

x2 = (x_cm * (m1 + m2) - m1 * x1) / m2

Substituting the given values:

x2 = (x_cm * (8 kg + 10 kg) - 8 kg * 3 m) / 10 kg

Simplifying:

x2 = (x_cm * 18 kg - 24 kg*m) / 10 kg

Now, we can set the y-coordinate of the center of mass equal to 4.5 m and solve for x_cm:

4.5 m = (8 kg * 3 m + 10 kg * x2) / (8 kg + 10 kg)

Simplifying:

4.5 m = (24 kg + 10 kg * x2) / 18 kg

Multiplying both sides by 18 kg:

81 kg*m = 24 kg + 10 kg * x2

Subtracting 24 kg from both sides:

10 kg * x2 = 81 kg*m - 24 kg

Dividing both sides by 10 kg:

x2 = (81 kg*m - 24 kg) / 10 kg

Simplifying:

x2 = 8.1 m - 2.4 m

x2 = 5.7 m

(brainlest?) ples:(

Answer:

the 10 kg mass should be placed at x = -2.4 m to achieve a center of mass at y = 4.5 m.

Explanation:

To find the position along the x-axis where the 10 kg mass should be placed so that the center of mass is located at y = 4.5, we can use the principle of the center of mass.

The center of mass of a system is given by the equation:

x_cm = (m1x1 + m2x2) / (m1 + m2),

where x_cm is the x-coordinate of the center of mass, m1 and m2 are the masses, and x1 and x2 are the positions along the x-axis.

Given:

m1 = 8 kg,

x1 = 3 m,

m2 = 10 kg,

y_cm = 4.5 m.

To solve for x2, we need to find the x-coordinate of the center of mass (x_cm) by using the y-coordinate:

y_cm = (m1y1 + m2y2) / (m1 + m2),

where y1 and y2 are the positions along the y-axis.

Rearranging the equation and substituting the given values:

4.5 = (83 + 10y2) / (8 + 10).

Simplifying the equation:

4.5 = (24 + 10*y2) / 18.

Multiplying both sides by 18:

81 = 24 + 10*y2.

Rearranging the equation:

10*y2 = 81 - 24,

10*y2 = 57.

Dividing both sides by 10:

y2 = 5.7.

Therefore, the y-coordinate of the 10 kg mass should be 5.7 m.

To find the x-coordinate of the 10 kg mass, we can use the equation for the center of mass:

x_cm = (m1x1 + m2x2) / (m1 + m2).

Substituting the given values:

x_cm = (83 + 10x2) / (8 + 10).

Since the center of mass is at x_cm = 0 (the origin), we can solve for x2:

0 = (83 + 10x2) / (8 + 10).

Rearranging the equation:

83 + 10x2 = 0.

24 + 10*x2 = 0.

10*x2 = -24.

Dividing both sides by 10:

x2 = -2.4.

Answer:

A.) Work function = 2.3 eV

B.) Max. K.E observed = 1.1 eV

Explanation:

A.) Millikan observed a maximum kinetic energy of 0.550 eV when electrons were ejected with 433.9-nm light. When light of 253.5 m was used, he observed a maximum kinetic energy of 2.57 eV. 

work function (f) is the minimum energy required to remove an electron from the surface of the material.

hf = Ø + K.E (maximum)

Where

h = Plank constant 6.63 x 10-34 J s

Ø = work function

hc/λ = Ø + K.E (max)

(6.63×10^-34 × 3×10^8)/433.9×10^-9 = Ø + 0.550 × 1.6×10^-19

4.58×10^-19 = Ø + 8.8×10^-20

Ø = 4.58×10^-19 - 8.8×10^-20

Ø = 3.7 × 10^-19 J

Converting Joule to eV

Ø = 3.7 × 10^-19/1.6×10^-19

Ø = 2.3 eV

B.) When light of wavelength 362.4 m is used

The maximum K.E observed = incident light K.E - (the work function).

Incident K.E = hf = hc/λ

Incident K.E =

(6.63×10^-34 × 3×10^8)/362.4

Incident K.E = 5.5 × 10^-28J

Let's convert joule to eV

Incident K.E = 5.5×10^-28/1.6×10^-19

Incident K.E = 3.4 × 10^-9

Max. K.E observed = 3.4 - 2.3

Max. K.E observed = 1.1 eV

Answer:

The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass.

Explanation:

Answer:

1. Information Gathering

2. Analysis and Planning.

3. Implementation of a solution.

4. Assessment of the effectiveness of the solution.

5. Documentation of the incident.

a. Upthrust on the solid:

\(Upthrust = volume of solid * density of fluid * g = 1000 kg/m^3 * volume of solid * 10 m/s^2\)

b. Volume of the solid:

\(volume = mass/density = 1.3 kg / (1000 kg/m^3) = 1.3 x 10^-3 m^3\)

c. Density of the solid:

So,\(density = mass/volume = 1.3 kg / (1.3 x 10^-3 m^3) = 1000 kg/m^3\)

Upthrust is the upward force exerted on an object immersed in a fluid. It is equal to the weight of the fluid displaced by the object and acts in the opposite direction to gravity. Upthrust helps to counteract the weight of the object and keep it afloat.

a. The upthrust on an object immersed in a fluid is equal to the weight of fluid displaced by the object. The weight of fluid displaced can be calculated using the formula:

Weight of fluid = volume of fluid * density of fluid * g

Since the solid is completely immersed in water, the volume of the fluid displaced is equal to the volume of the solid. The density of water is given as 1000 kg/m^3, and the acceleration due to gravity is given as\(10 m/s^2.\)

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Answer:

Explanation:

That's my answer hope it helped

Answer:

The correct option is d: 102 m/s.

Explanation:

The terminal velocity is given by:

\(v = \sqrt{\frac{2mg}{\rho AC}}\)   (1)

Where:

m: is the mass = 90 kg

g: is the gravity = 9.81 m/s²

A: is the area = 0.14 m²

C: is the drag coefficient = 1.0  

ρ: is the density of the air = 1.21 kg/m³  

Now, by entering the above values into equation (1) we have:

\(v = \sqrt{\frac{2mg}{\rho AC}} = \sqrt{\frac{2*90 kg*9.81 m/s^{2}}{1.21 kg/m^{3}*0.14 m^{2}*1.0}} = 102 m/s\)

Therefore, the correct option is d: 102 m/s.

I hope it helps you!  

Answer:

Option B

Explanation:

in all the 3 light moves from rarer medium to denser medium, so obviously experience refraction!!

Answer:

The answer is A

Explanation:

im pretty sure its A because i did it in class

If the volume of the solvent is increased, the additional solvent will simply dilute the solution without affecting the concentration or the amount of solute that is dissolved. The solution will still remain saturated, but the concentration of the solute will be lower due to the increased volume of the solvent.

If the volume of solvent is increased while keeping the concentration of the solution constant, the saturated solution would not change. This is because the concentration of a solution is defined as the amount of solute present in a given volume of solvent.

By increasing the volume of the solvent while keeping the concentration constant, the total amount of solute remains the same.

In a saturated solution, the solvent has dissolved as much solute as it can at a given temperature. Any additional solute added to the solution will not dissolve and will form a solid precipitate at the bottom of the container.

Increasing the volume of the solvent does not affect the amount of solute that has already dissolved and reached its maximum solubility.

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Answer:

Because it kills people. I have had 6 relatives who have died from it in the past 2 years. It's horrible.

Explanation:

If you're wondering what causes cancer, it is rapid and uncontrollable cell regeneration. The majority of cancers result from random mutations arising during DNA replication in the normal stem cells required during development and tissue maintenance.

Explanation:

Cancer kills by invading key organs such as

the intestines, lungs, brain, liver, and kidneys. cancer interfers with body functions that are necessary to live.

What is Alpha decay?

Alpha decay is that the nuclear decay method whereby the parent nucleus emits an particle. The alpha particle, structurally such as the nucleus of a element atom and denoted by the Greek letter α, consists of 2 protons and two neutrons.

This ejected particle is understood as an alpha particle and is solely a helium nucleus. Alpha particles have a comparatively giant mass and a positive charge.

In α-decay, the nucleon number of the merchandise nucleus (daughter nucleus) is four not up to that of the decaying nucleus (parent nucleus), whereas the number decreases by two. In general, the radioactive decay equation is painted as follows: Z A X → Z − two A − four Y + 2 4 He.

Hence final answer is

1. - a

2. - b

3. - c

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US President Biden signed an agreement to end the national emergency of COVID-19 in advance, but it was strongly opposed by the White House spokesman.

The new coronavirus SARS-CoV-2 is the cause of the extremely contagious disease COVID-19. The virus was discovered for the first time in Wuhan, China, in December 2019, and it spread fast over the world, causing a pandemic. When an infected person coughs, sneezes, or talks, respiratory droplets from their mouth or nose are the main means of disease transmission.

On April 10, 2023, President Biden approved legislation written by Republicans that put an end to the COVID-19 pandemic's state of emergency. Notwithstanding the fact that the White House intended to stop making emergency declarations on May 11, the GOP's proposed legislation received some bipartisan support in Congress. The measure, according to the White House, "would generate widespread turmoil and uncertainty throughout the health care system – for states, for hospitals and doctor's offices, and, most crucially, for tens of millions of Americans," A White House representative, however, downplayed the significance of the law, stating that the end of the emergency "does not affect our ability to wind down authorities in an orderly manner."

A White House representative later minimized the bill's effects, saying they would not have an impact on the scheduled wind-down of authority on May 11.

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Answer:

To establish this relationship we must examine the potentials that these forces create. The electrical potential is described by

        Ve = k q / r

The potential for strong nuclear force is

       Vn (r) = - gs / 4pir exp (-mrc / h)

Where gs is the stacking constant and r the distance between the nucleons,

We can compare these potentials where the force is derived from the relationship

       E = -dU / dr

       F = q E

Explanation:

a and b ik thats the awser becuse imjust did it

Answer:

Explanation:

if the frequency changes so does the energy and that doesn't happen to EM waves entering a medium by the conservation of energy

Correct me if im wrong but im 100% its B

Answer: 30m

Explanation:

Given:

Speed: 1.5m/s

Time: 20 seconds

Distance = speed × time

Distance = 1.5 × 20

= 30m

Therefore you will travel 30m

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Answer:

1. 10

2. 1000

3. 600

4. 420

5.  5

6. 0.1

7. 1.5e+6

8. 300

9. 6.5e+6

10. 120000

11. 7.2

12. 5.3

13. decimeter or dm

14. 1 dekagram = 1,000 centigrams

15. millimeter

Answer:

Half

Explanation:

If the half life of an isotope is 20 years, then half of the original amount will  remain after 20 years has passed.

That's what "half-life" means.

Similarly, after ANOTHER 20 years, 1\4 of the original amount remains.

And after ANOTHER 20 years, 1\8 of the original amount remains.

And after ANOTHER 20 years, 1\16 of the original amount remains.

And after ANOTHER 20 years, 1\32 of the original amount remains.

And after ANOTHER 20 years, 1\64 of the original amount remains.

And after ANOTHER 20 years, 1\128 of the original amount remains.

Answer:

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

Explanation:

The electron's distance from the nucleus in the 1s state of a hydrogen atom is A = [(r * (a^3 / 4√π) * ∫ e^(-2r/a) dr) - (a^3 / 4√π) * (∫ e^(-2r/a) dr)^2] from 0 to ∞ = [(r * (a^3 / 4√π) * (a/2)) - (a^3 / 4√π) * (a/2)^2].

To find the expectation value of the electron's distance from the nucleus in the 1s state of a hydrogen atom, we need to calculate the quantity Ar, where A is given by:

A = ⟨r⟩ = ∫ r * ψ(1s) * r^2 dr from 0 to ∞

First, let's express ψ(1s) in terms of the radial wavefunction R(r):

ψ(1s) = R(r) * Y(0,0)  [Since the 1s state has azimuthal quantum number l = 0 and magnetic quantum number m = 0]

The radial wavefunction R(r) for the 1s state is given by:

R(r) = (1 / √π * a^(3/2)) * e^(-r/a)

Now, let's calculate A:

A = ∫ r * ψ(1s) * r^2 dr from 0 to ∞

 = ∫ r * (1 / √π * a^(3/2)) * e^(-r/a) * r^2 dr from 0 to ∞

We can use integration by parts to simplify this integral. Let's define u = r and dv = (1 / √π * a^(3/2)) * e^(-r/a) * r^2 dr.

Taking the differentials, we have du = dr and v = ∫ (1 / √π * a^(3/2)) * e^(-r/a) * r^2 dr.

Integrating v, we can use the given integrals:

v = ∫ (1 / √π * a^(3/2)) * e^(-r/a) * r^2 dr

 = (a^3 / 4√π) * ∫ e^(-2r/a) dr  [Using the given integral]

Now, applying integration by parts:

∫ u dv = uv - ∫ v du

∫ r * (1 / √π * a^(3/2)) * e^(-r/a) * r^2 dr

= (r * v) - ∫ v du

= (r * (a^3 / 4√π) * ∫ e^(-2r/a) dr) - ∫ [(a^3 / 4√π) * ∫ e^(-2r/a) dr] dr

Simplifying the expression:

A = [(r * (a^3 / 4√π) * ∫ e^(-2r/a) dr) - (a^3 / 4√π) * ∫ ∫ e^(-2r/a) dr dr] from 0 to ∞

The integral ∫ ∫ e^(-2r/a) dr dr can be expressed in terms of the given integrals:

∫ ∫ e^(-2r/a) dr dr = (∫ e^(-2r/a) dr)^2

                     = (a/2)^2   [Using the given integral]

Now, substituting the values and evaluating the limits:

A = [(r * (a^3 / 4√π) * ∫ e^(-2r/a) dr) - (a^3 / 4√π) * (∫ e^(-2r/a) dr)^2] from 0 to ∞

 = [(r * (a^3 / 4√π) * (a/2)) - (a^3 / 4√π) * (a/2)^2]

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Answer:

d

Explanation:

reversing the current, reverses the poles of the electromagnet....this keeps the rotor spinning in the stationary mag field

Answer:

Explanation:

Distance of barrier = 40 m

Distance covered during reaction time = .75 x 40 = 30 m .

distance covered during deceleration can be calculated as follows .

v² = u² - 2 a s

0 = 40² - 2 x 10 x s

s = 80 m

Total distance covered before coming to rest = 30 + 80 = 110 m

Distance of barrier = 40 m , so it will hit the barrier .

Answer:

it is potential energy ---- kinetic energy

Answer:

what

you need to elaborate

Answer: Can you please write question clearly.

Explanation:

Answer:the ballon and the comb have the same electrical charge

Explanation:because I got the answer right

The comb is able to repel the balloon is that the balloon and the comb possess the same electrical charge. Therefore, option (B) is correct.

Electric charge is the physical property of matter that offers it to experience a force when keep in an electric or magnetic field. An electric charge is related to an electric field, and the moving electric charge produced a magnetic field.

The interaction of the charges creates an electromagnetic force and the combination of an electric field and magnetic field is called an electromagnetic field.

When the students rub a balloon and comb against his hair several times static charges are built up on the balloon and the comb.  When the students place the comb near the balloon and the comb repels the balloon means that both the comb and the balloon possess the same type of electrical charges.

Therefore, the balloon and the comb acquired the same electrical charge.

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