An object of mass 8kg is attached to massless string of length 2m and swum with a tangential velocity of 3 what is the tension on the string
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
In an experiment, an object is heated.
The data from the experiment is shown.
The energy transferred to the object is 3.0 kJ.
The mass of the object is 2.0 kg.
The rise in temperature of the object is 10°C.
The specific heat capacity of the object is 150 J/(kg°C).
What is the thermal capacity of the object?
A 30J/°C
B 300 J/°C
C 3000J/°C D 9000 J/°C
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
What is heat capacity ?
"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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If I start with an 30 gram sample of Plutonium-244, how many grams would be left of Plutonium-244 after 1 half life
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.
how does the eye control the amount of light entering it?
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
Susie blows up a balloon. First, she places the balloon in a bucket of ice water. She observes the balloon. She then removes the balloon and places it into a bucket of hot water. She observes the balloon again.
1. Explain what Susie will observes when she puts the balloon in ice water.
2. Explain what Susie will observe when she puts the balloon in hot water.
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.
What is Charles's law of gas?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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Willing to give out Brainliest: 3.00 m^3 of water is at 20.0°C If you raise its temperature to 60.0°C, by how much will its volume expand ?
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
A cyclist travels 1850 m north and then 1200 m south. Find both the distance it has traveled and the magnitude of its displacement.
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.
9)A 64 kg parent and a 16 kg child meet at the center of an ice rink. They place their hands together and push. (A) Is the
force experienced by the child more than, less than, or the same as the force experienced by the parent? (B) is the
acceleration of the child more than, less than, or the same as the acceleration of the parent? Explain. (C) If the
acceleration of the child is 2.5 m/s^2 in magnitude, what is the magnitude of the parent's acceleration?
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
Through which gas in the table do sound waves travel at the slowest speed?
Air (dry)/Ammonia/Methane/Nitrous oxide
Speed of sound (m/s) 346/ 415/ 450/ 263
A. Ammonia
B. Nitrous oxide
C. Air
D. Methane
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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Question.
what is a crystal?
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
why do compass needles around a current carrying wire point in different directions
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.
How are points made in soccer ?
a- by kicking the ball into the goal net
b - by carrying the ball into end zone
c - by shooting the ball into the hoop
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
consequences and application of expansion in physics
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.
What are Application in physics?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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ten point on important of sports and games in human life
please help me I need to get this right
Circle the correct word(s) in brackets to complete each sentence.
i) Hooke's Law works for ( springs only / all materials / some materials ).
ii) Hooke's Law only applies ( up to / over ) a certain force.
iii) The force at which Hooke's Law stops working for springs is
( higher / lower ) than
for most other materials?
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.
Gravitational force depends on __________ and __________.
a.
mass, distance
c.
distance, strength
b.
mass, strength
d.
strength, speed
Please select the best answer from the choices provided
A
B
C
D
Answer: pretty sure it’s A
Explanation:
HELP ASAP please.
Determine if each picture is a high or low tide.
Note: only ONE picture can be a high tide and only ONE picture can be a low tide!
Answer:
1st one low tide 2nd high tide
Write a hypothesis about the use of an object’s physical characteristics to determine its density. Use the format "if . . . then . . . because . . .” and be sure to answer the lesson question "How can the density of an object be determined?” BE ORIGINAL AND SIMPLE
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:
how can we take advantage of waste materials
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.
What happens when a soccer player commits a foul ?
a - the opposite team gets a throw in the ball
b - the opposite team gets a free kick
c - the opposite team gets a point
Answer:
b - the opposite team gets a free kick
Explanation:
explain why in the construction of a lightning conductor one end is made into a sharp point
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.
What is included in the units of Velocity that make it different from speed?What is included in the units of Velocity that make it different from speed?
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.
Скільки тепла отримає цинкове тіло масою 2 кг, якщо воно підвищить свою температуру з 10 ° C до 60 ° C.
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.
2. Because it can take one year to form just a few centimeters of new soil, 3 points
it is important to protect Earth's soil. *
True
False
Answer:
False.
Explanation:
The action of large, massive sections of a glacier break off and falling into the ocean is called ____________.
Group of answer choices
an iceberg
an ice sheet
calving
In a nuclear station if the temperature of the superheated water starts to decrease what should the engineer in charge of the reactor do?
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.
What does the atomic number of an atom tell us?
How much the atom weighs
The number of protons in the atom
Which column the element is in on the periodic table
The number of electrons it is likely to lose
Answer:
the number of protons in the atom.
Explanation:
Answer:
the number of protons in the atom
Explanation:
a body is thrown vertically upward from the earth's surface and it took 8 seconds to return to its original position . find out the initial velocity with which it was thrown up
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.
i hang a 15 cm length spring in the classroom. the spring has a spring constant of 99 N/m. i the. attach a mass of 439 g to the spring. based on the information provided, use hookes law to predict the new length of the spring. (answer in cm)
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