An inclined plane is set at an angle of 29 degrees above horizontalWhat is the acceleration of a 420 g block of ice sliding down the inclined plane? Assume no friction

Answer:

39000 Дж теплової енергії поглинається тілом цинку.

Explanation:

З наведеного вище питання із запитання були отримані наступні дані:

Маса (М) = 2 кг

Початкова температура (T₁) = 10 ° C

Кінцева температура (T₂) = 60 ° C

Тепло (Q) =?

Далі ми перетворимо 2 кг у грами (g). Це можна отримати наступним чином:

1 кг = 1000 г.

Отже,

2 кг = 2 кг × 1000 г / 1 кг

2 кг = 2000 г.

Таким чином, 2 кг еквівалентно 2000 г.

Нарешті, ми визначимо тепло, що поглинається тілом цинку, як показано нижче:

Маса (М) = 2000 г.

Початкова температура (T₁) = 10 ° C

Кінцева температура (T₂) = 60 ° C

Питома теплоємність (С) цинку = 0,39 Дж / гºС

Тепло (Q) =?

Q = MC (T₂ - T₁)

Q = 2000 × 0,39 (60-10)

Q = 780 × 50

Q = 39000 Дж

Отже, 39000 Дж теплової енергії поглинається тілом цинку.

Answer:

i) Hooke's Law works for some materials

ii) Hooke's Law only applies up to a certain force

iii) The force at which Hooke's Law stops working for springs is lower than for most materials

Explanation:

Hooke's Law of elasticity states that the deformation of an elastic material is proportional to the applied for small deformations

The law is applicable to elastic materials whose values of deformation or extension as well as the applied load or stress are expressible by a single real number

Hooke's Law is applicable when the force and the extension of the elastic material are proportional, at larger force, the elastic material is observed to expand more than as expected based on Hooke's Law

The nature of springs is such that its elastic limit is reached by a much lower force than for most materials. Therefore, Hooke's law stops working for springs at a lower force than for most materials.

Answer:

Direction

Explanation:

Speed is a measure of the distance covered by a moving object relative to the time it takes. It is a scalar quantity and, hence, measured irrespective of the direction the object is moving.

Velocity, on the other hand, is the speed of a moving object in a particular direction. It is a vector quantity, meaning that the direction of the moving object is important.

Therefore, the difference in the unit of speed and velocity is direction. The direction must be included in the unit of velocity.

Answer:

(A) The same

(B) More

(C) The magnitude of the parent's acceleration is 0.625 m/s²

Explanation:

The given parameters are;

The mass of the parent, m₁ = 64 kg

The mass of the child, m₂ = 16 kg

(A) By Newton's third law of motion, action and reaction are equal and opposite

Therefore, the action of the parent on the child is equal to the reaction of the child on the parent and vice versa

Therefore, the force experienced by the child is the same as the force experienced by the parent

(B) Newton's second law states that an objects acceleration is directly proportional to the applied force and inversely proportional to the mass of the object

Therefore, the parent and the child both experience the same force but the mass of the child is less than the mass of the parent and therefore, by Newton's second law, the acceleration of the child will be more than the acceleration of the parent for the same given force

(C) The acceleration of the child, a₂ = 2.5 m/s²

Let F₁ represent the force experienced by the parent, let F₂ represent the force experienced by the child and let a₁ represent the magnitude of the parent's acceleration

By Newton's third law, we have;

F₁ = F₂

Force, F = Mass, m × Acceleration, a

We can write, F = m × a

Therefore;

F₁ = m₁ × a₁ and F₂ = m₂ × a₂

∴ F₁ = F₂ gives;

m₁ × a₁ = m₂ × a₂

a₁ = (m₂ × a₂)/m₁ = (16 × 2.5)/64 = 0.625

∴ The magnitude of the parent's acceleration = a₁ = 0.625 m/s²

Answer:

The initial velocity with which the body was thrown up is 39.2 m/s

Explanation:

The given parameters for the body are;

The time it takes the body to return back to its initial position = 8 seconds

To answer the question, we make use of the kinematic equation of motion, v = u - g·t

Where

v = The final velocity of the body = 0 m/s at the maximum height

u = The initial velocity

g = The acceleration due to gravity = 9.8 m/s²

t = The time in which the body spends in the air

Therefore, at maximum height, we have;

v = 0 = u - g·t

u = g·t

t = u/g

From h = 1/2gt², which gives t = √(2·h/g), the time the body takes to maximum height = The time the body takes to return to its original position from maximum height.

Therefore, the total time in which the body is in the air = 2 × t = 2× u/g

∴

The total time in which the body is in the air = The time it takes the body to return back to its initial position after being thrown = 2 × t =  8 seconds

∴ 2 × t = 8 s = 2 × u/g

8 s = 2 × u/g

u = (8 s × g)/2

∴ u = (8 s × 9.8 m/s²)/2 = 39.2 m/s

The initial velocity with which the body was thrown up = u = 39.2 m/s.

Answer:

15 g

Explanation:

Given,

Plutonium-244 = 30 g

We have to find the gram of Plutonium-244 left after 1 half-life.

We know that the half-life of a radioactive isotope is constant. The half-life of a Radioactive isotope does not depend on the initial amount of isotope.

Now,

After 1 half-life

Plutonium-244 left = [tex]\dfrac{30}{2}[/tex]

                               = 15 g

Hence, 15 g of the Plutonium-244 will be left after 1 half-life.

Answer:

the number of protons in the atom.

Explanation:

Answer:

the number of protons in the atom

Explanation:

Answer:

False.

Explanation:

Answer:

we can incinerate waste materials and use the product as fuel rather than dumping them. It may produce carbon dioxide but we can create a machine that can convert carbon into energy.

Answer:

If an object has a high density then the molicules making up that object are closly packed togeather. Because of this, objects with a higher density will have more mass than objects of the same size that have a lesser density.

Answer:

If an object has a high density then the molicules making up that object are closly packed togeather. Because of this, objects with a higher density will have more mass than objects of the same size that have a lesser density.

Explanation:

Answer: the answer would be methane if the problem is asking for the fastest

Explanation:

Methane (CH₄) is a chemical compound and a primary component of natural gas. The gas in the table through which sound waves travel at the slowest speed is D. Methane. According to the given speeds of sound in the table, methane has the lowest speed of sound at 263 m/s.

Methane is formed through various natural processes, including the decay of organic matter in anaerobic (oxygen-deprived) environments such as wetlands, landfills, and the digestive systems of animals.

The speed of sound in a gas depends on factors such as the density and elastic properties of the gas. The molecular composition and temperature of the gas can also affect the speed of sound. In this case, the properties of methane result in a slower speed of sound compared to the other gases mentioned.

Therefore, the gas in the table through which sound waves travel at the slowest speed is D. Methane. According to the given speeds of sound in the table, methane has the lowest speed of sound at 263 m/s.

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Answer:

b - the opposite team gets a free kick

Explanation:

A crystal or is a solid material whose constituents are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions

hope this helps

Answer: because of the magnetic

Explanation:  If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.

Answer:

The answer is below

Explanation:

Charlee's law states that the volume of a gas is directly proportion to the temperature of the gas at constant pressure. That is:

V = kT, where V = volume and T = temperature, k = constant. Therefore:

V / T = k

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

Given that: [tex]V_1=3\ m^3, T_1=20^oC=(20 + 273)K=293\ k,T_2=60^oC=(60 + 273)K=333\ k.\\\\\frac{V_1}{T_1}=\frac{V_2}{T_2}\\\\\frac{3}{293}=\frac{V_2}{333} \\\\V_2=\frac{3}{293}*333\\\\V_2=3.41\ m^3\\[/tex]

The new volume is 3.41 m³. That is it expands by 0.41 m³

Answer:

0.02484

Explanation:

Trust me bro

Answer:

1st one low tide 2nd high tide

Answer: 0.19 m

Explanation:

Spring constant (k) = 99 N/m

Length of spring hung = 15cm = 0.15m

Mass attached to the spring = 498g

The new length of spring :

F = kdx

F = mass (m) * acceleration due to gravity (g)

g = 9.8 m/s²

dx = L2 - L1 (Change in length)

m = 439 / 1000 = 0.439kg

L2 = new length

L1 = initial length

mg = k(L2 - L1)

0.439 * 9.8 = 99(L2 - 0.15)

4.3022 = 99(L2 - 0.15)

4.3022 = 99L2 - 14.85

4.3022 + 14.85 = 99L2

19.1522 = 99L2

L2 = 19.1522 / 99

L2 = 0.1934565

L2 = 0.19 m

New length of spring = 0.19 m

Answer:

They sh0uld g0 t0 the reactor and then, see what the issue is...

Explanation:

then, see if they can fix the problem, im sorry if its wr0ng.

Answer:

When solid material expands in response to an increase in temperature (thermal expansion), it can increase in length in a process known as linear expansion. for an example application of expansion and contraction. ... Strain, a material's response to stress, can cause it to deform.

When solid material expands in response to an increase in temperature (thermal expansion), it can increase in length in a process known as linear expansion.

Application of expansion and contraction.  Strain, a material's response to stress, can cause it to deform. The study of matter, its nature, and qualities is the subject of physics, which also examines heat, mechanics, light, electricity, magnetism, the structure of atoms, and sound.

In the science of physics, fundamental questions about life are asked, and through observation and investigation, solutions are discovered.

The fundamental problems of life are addressed by physicists using just observational and investigative techniques.

Therefore, When solid material expands in response to an increase in temperature (thermal expansion), it can increase in length in a process known as linear expansion.

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Answer:

A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.

Explanation:

A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good conductor) connected directly to the ground. ... The lightning conductor is placed higher than the roof so that if lightning strikes, it strikes the conductor before it can reach the house.

Answer:

36 N

Explanation:

If the object of mass, m = 8 kg is swung in a horizontal circle of radius, r = 2m = length of string with tangential velocity v = 3 m/s, the tension in the string is the centripetal force which is T = mv²/r

= 8 kg × (3 m/s)²/2 m

= 4 kg × 9 m/s²

= 36 N

Answer:

Dilating the pupils.

Answer:

the retina of the eye contains photoreceptor cells that detect the light intensity, whether it is dim or bright, changing shape of iris.

Explanation:

in dim light, the receptors detect the light intensity, and in order to allow us to see more clearly, the radial muscles in iris contract, making the pupil widen(dilate), so more light enters eye.

in case of bright light, he receptors detect the light intensity, and in order to allow us to see more clearly, the circular muscles in iris contract, making the pupil narrow(constrict), so less light enters eye

Answer:

B) 300 J/°C

Explanation:

Q = 3kJ = 3000J

ΔT = 10°C

3000J/10°C = 300J/°C

To calculate heat capacity, use the formula: heat capacity = E / T, where E is the amount of heat energy supplied and T is the change in temperature.

E = 3kJ = 3000J

ΔT = 10°C

Heat capacity = E / T,

3000J/10°C = 300J/°C

"Heat capacity or thermal capacity is a physical property of matter, defined as the amount of heat to be supplied to an object to produce a unit change in its temperature." The SI unit of heat capacity is joule per kelvin. Heat capacity is an extensive property.

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Answer:

a- By kicking the ball into the goal net

Explanation:

You cant pick the ball up so b is not the answer and there is no hoop so c is also not the answer. The answer is A

Answer:

The distance it has traveled is 3,050 m and the magnitude of its displacement is 650 m north.

Explanation:

Distance refers to the length between any two points in space, while displacement refers to the distance from a start position to an end position regardless of the path.

In other words, distance refers to how much space an object travels during its movement; is the quantity moved. It is also said to be the sum of the distances traveled. The distance traveled by a mobile is the length of its trajectory and it is a scalar quantity. In this case, the distance is calculated as:

1850 m + 1200 m= 3,050 m

Displacement refers to the distance and direction of the final position from the initial position of an object. The displacement effected is a vector quantity. The vector representing the displacement has its origin in the initial position, its end in the final position, and its module is the distance in a straight line between the initial and final positions. That is, when expressing the displacement it is done in terms of the magnitude with its respective unit of measurement and the direction because the displacement is a vector type quantity. Mathematically, the displacement (Δd) is calculated as:

Δd= df - di

where df is the final position and di is the initial position of the object.

In this case, the displacement is calculated as:

1850 m - 1200 m= 650 m

Since the distance to the north is greater, the direction of travel will be to the north.

The distance it has traveled is 3,050 m and the magnitude of its displacement is 650 m north.

Answer: pretty sure it’s A

Explanation:

1. When Susie puts the balloon in ice water, she will observe the contraction of the balloon.

2.  When Susie puts the balloon in hot water, she will observe  the expansion of the balloon.

According to Charles' law, assuming the pressure is constant, the volume occupied by a fixed amount of gas is directly proportional to its absolute temperature. French physicist J.-A.-C. Charles initially proposed this empirical relationship.

1.  When Susie puts the balloon in ice water, the temperature of the gas inside the balloon will decreases and according to Charles' law  its volume also decreases. That's why, she will observe the contraction of the balloon.

2. When Susie puts the balloon in  hot water, the temperature of the gas inside the balloon will increases and according to Charles' law its volume also increases. That's why, she will observe the expansion of the balloon.

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