If a liter of water is heated from 20 C to 50 C, what happens to its volume?
a. The volume decreases.
b. The volume increases.
c. The volume first increases, then decreases.
d. The volume first decreases, then increases,
Please select the best answer from the choices provided

Explanation:

mass of the body=30kg

area on which it is exerting pressure=400 cm2 to m2

=4m2

pressure it exerts=?

the formula for finding pressur in physics is F/A where the mass of the body is the force implied while area is taken as area

therefore:pressure=F/A

=30/4

=7.5 kgm/s2

=

Answer:

7500 N/m²

Explanation:

The formula for finding pressure = force/area

force = 30 kg we convert this to newtons.this is because pressure is in N/m²

30 x 10 = 300N

Area = 400cm² we convert to m² = 400/10000 = 0.04

pressure = force/ area

 pressure   = 300/0.04 = 7500 N/m²

If you need any more explanation pls do mention in the comment section so that i can help more.

Hope this helps and if it does mark as branliest answer thx

Explanation:

Let's begin with the cup's free body diagram (figure attached), there we are able to see the forces acting on this object:

On the X axis:

[tex]F_{x}=F_{1}+F_{2}[/tex]   (1)

Where:

[tex]F_{1}=17.8N[/tex] is the force of the wind

[tex]F_{2}=-2N[/tex] is the opposing force (that is why it has the negative sign)

So:

[tex]F_{x}=17.8N-2N=15.8N[/tex]   (2)

In addition we know by Newton's 2nd law:

[tex]F_{x}=m.a[/tex]   (3)

Where:

[tex]m[/tex] is the mass of the cup

[tex]a=7m/s^{2}[/tex] is its acceleration

Substituting (2) in (3):

[tex]15.8N=m(7m/s^{2})[/tex]   (4)

Finding [tex]m[/tex]:

[tex]m=\frac{15.8N}{7m/s^{2}}=2.25kg[/tex]   (5)

On the other hand we have the forces acting on the Y axis:

[tex]F_{y}=N-W=0[/tex]   (6)

Where:

[tex]N[/tex] is the normal force

[tex]W=m.g[/tex] is the weight of the cup, being [tex]g=9.8m/s^{2}[/tex] the acceleration due gravity

This means:

[tex]N=W=m.g[/tex]   (7)

Substituting (5) in (7):

[tex]W=(2.25kg)(9.8m/s^{2})[/tex]   (8)

Finally:

[tex]W=22.05N[/tex]   This is the weight of the cup

An electric motor changes electrical energy into mechanical energy, often found in household appliances like vacuum cleaners or blenders. They use the interaction between a spinning coil of wire and a magnet.

An electric motor is a device that transforms electrical energy into mechanical energy. This is accomplished through the interaction between a spinning coil of wire and a magnet, a mechanism called electromagnetic induction. Many common appliances with moving parts, such as vacuum cleaners or blenders, contain electric motors in their design to facilitate desired functionalities, such as rotation or movement.

Option B, which suggests an electric motor can be powered by a hand crank, is incorrect. This describes a manual or mechanical system, not an electric motor.

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Electric motors convert electrical energy into mechanical energy through magnetic interactions.

Electric motors are devices that convert electrical energy into mechanical energy. They operate based on the interaction of magnetic fields and current-carrying conductors, generating force to produce motion. Electric motors are commonly found in various applications like industrial fans, household appliances, power tools, and more.

Answer:    True

Explanation:

edgen 2022

B. The current the battery equals to the sum of the currents in the resistors  describes the current in a circuit that is made up of any two resistors connected in parallel with a battery

When two or more resistances are connected between the same two points, they are said to be connected in parallel combination

Resistors are connected in parallel combination  , and its been known that if resistors are connected in parallel combination  than current gets divided in each branch according to the value of resistance attached in that branch and voltage remains same across each resistance .

Also total current in the circuit or current in the battery  is equal to the algebraic sum of current in each branch of the circuit

correct answer will be B. The current the battery equals to the sum of the currents in the resistors

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Answer:

b. 20%

Explanation:

Efficiency of an engine is a ratio in percentage of the work done to the energy intake of the engine.

η=(Q₁-Q₂)/Q₁×100%

η is efficiency, Q₁ is the energy intake, Q₂ is energy wasted.

The information provided is:

Energy intake = 400 J

Work done = 80 J = (400-320) =Q₁-Q₂

Energy wasted =320 J

η= 80/400×100%

=20%

Answer:

B.20 %

Explanation:

Answer:

A. Tension force

Explanation:

These are bridges that use cables to hold the road way up.

The cables in a suspension bridge receive the tension force of the bridge. These cables transmit these forces to the towers supporting the bridge and are compressed into the ground.

Answer:

The correct answer is option A. "tension force".

Explanation:

Suspension bridges, like the Golden Gate Bridge or the Brooklyn Bridge, use tension force as the primary source of force that cables use to hold their spans up. The supporting cables receive the tension forces of the bridge, and this same force passes to the anchorages and into the ground. This equilibrium that the tension force gives among the different elements of the bridge, gives the support to hold the bridge together.

Answer:

84 m/s2.

Explanation:

A. 0.0051

B. 0.43

C. 25

D. 84

Answer:

84 m/s^2

Explanation:

The density of the ring is calculated by dividing its mass (16.5 g) by its volume (1.5 cm^3). The resulting density is 11.0 g/cm^3.

The density of an object can be calculated by dividing its mass by its volume, according to the formula Density = Mass/Volume. In this case, Francois found the mass of the ring is 16.5 g. The volume can be determined by the displacement of water in the graduated cylinder, which is 11.5 cm - 10.0 cm = 1.5 cm3. Now we can calculate the density using the given values: Density = 16.5 g / 1.5 cm3 = 11.0 g/cm3. So, the option C, 11.0 g/cm is the correct answer.

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the answer is D) The air in the aquarium is saturated

none of the other answers were realistic AND I took this before so I know the right answer.

Answer:

d.

Explanation:

Look at it this way, when a sponge is saturated it cannot take in any more water. When air (a mixture of gasses) is saturated it cannot take in any more water vapour and water vapour will condense out as liquid water. This is termed the saturation point.

Air is classed usually as a percentage of saturation, dry air being 0% and saturated 100%

However, unlike the sponge ananalogy, 1kg of air will have a different capacity for water vapour depending on its temperature (and pressure). Charts (Psycrometric Charts) are available that allow the degree of saturation to be calculated, usually by determining the dew point (temperature at which 100% saturation occurs) by using a wet bulb thermometer and comparing it with the normal dry bulb temperature.

Answer:

A. 30 m/s

D. 15 kilometers

Explanation:

Vector quantities have both magnitude and direction. Among the provided choices, B and C are scalar quantities as they have no direction.

30 m/s is the magnitude for velocity, a derivative of displacement.

15 kilometers is the metric magnitude (10³m) for displacement.

Answer:

0.26 m³

Explanation:

There are three forces on the boat: weight of the boat, weight of the passengers, and buoyancy.

∑F = ma

B - mg - Mg = 0

Buoyant force is equal to the weight of the fluid displaced.

ρVg - mg - Mg = 0

ρV - m - M = 0

V = (m + M) / ρ

Given m = 20 kg, M = 110 kg, and ρ = 1000 kg/m³:

V = (20 + 110) / 1000

V = 0.13 m³

Since this is half of the boat's volume, the total volume is 0.26 m³.

The total volume of the boat is  0.0265 cubic meters.

Archimedes' principle, which states that the buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by the object.

Here in the Question,

Let's begin by finding the weight of the water displaced by the submerged part of the boat. Since we know that 50% of the boat is submerged, we can assume that the volume of water displaced is equal to half of the volume of the boat.

The weight of the water displaced can be found using the density of water, which is 1000 kg/m³. The formula for the weight of water displaced is:

Weight of water displaced = density of water x volume of water displaced x gravitational acceleration

where gravitational acceleration is 9.8 m/s².

Let V be the total volume of the boat. Then, the volume of water displaced is V/2, since 50% of the boat is submerged.

The weight of the boat is 20 kg, and the weight of the passengers is 110 kg. Therefore, the total weight of the boat and passengers is:

Total weight = weight of boat + weight of passengers

Total weight = 20 kg + 110 kg

Total weight = 130 kg

Now we can use Archimedes' principle to find the buoyant force on the boat:

Buoyant force = weight of water displaced = density of water x V/2 x gravitational acceleration

The buoyant force must be equal to the weight of the boat and passengers for the boat to float, so we have:

Buoyant force = Total weight

Substituting the values we have found, we get:

density of water x V/2 x gravitational acceleration = 130 kg x gravitational acceleration

Simplifying and solving for V, we get:

V = 130 kg / (density of water x 9.8 m/s² x 0.5)

Substituting the value of the density of water, we get:

V = 130 kg / (1000 kg/m³ x 9.8 m/s² x 0.5)

V = 0.0265 m³

Therefore, the total volume of the boat is approximately 0.0265 cubic meters.

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Answer:

False

Explanation:

Gravity and impact puts a toll on it.

Answer:

1. at the top of swing 2. at the top of swing 3. at the bottom of swing 4.at the bottom of swing

Explanation:

Answer:

The pendulum has the most potential energy at the top of swing.

The pendulum has the least kinetic energy at the top of swing.

The pendulum has the most kinetic energy at the bottom of swing.

The pendulum has the least potential energy at the bottom of swing.

Answer:

1. heat engine ~~ •a machine that converts the internal energy of a fuel into mechanical energy.

2. heat pump ~~ •an appliance that extracts heat energy from one source and deposits it

elsewhere.

3. Boiler ~~ •a heating appliance that uses heat energy released from fossil fuels to warm water for use in radiant or

convection heating systems.

4. Thermostat ~~ •an appliance that controls the maintenance temperature of a heating

system

Final answer:

Heat engine is a machine converting internal energy to mechanical energy; a heat pump moves heat from cool to warm areas; a boiler heats water with fossil fuel energy; and a thermostat maintains temperature in heating systems.

Explanation:

To answer your question of matching each term with the correct definition:

Answer is :

retina- last choice

The film in a camera serves the same role as the d) retina in the eye.

Both the film and the retina are responsible for capturing images. In a camera, light enters through the lens, passes through the aperture (similar to the pupil), and is focused onto the film, where the image is recorded. Similarly, in the human eye, light passes through the cornea and lens, is focused by the lens, and hits the retina at the back of the eye.

The retina contains photoreceptor cells that convert the light into electrical signals, which are then sent to the brain for processing, forming the image we see. Therefore, the film in the camera acts as the light-sensitive part that captures and stores the image, just like the retina functions as the light-sensitive layer that detects and processes visual information in the eye.

Answer:

c. 1600J

Explanation:

The loss in potential energy of the boy is given by:

[tex]U=mg \Delta h[/tex]

where

m = 40 kg is the mass of the boy

g = 9.8 m/s^2 is the acceleration of gravity

[tex]\Delta h = 4 m + 0.02 m = 4.02 m[/tex] is the total change in the height of the boy (4 metres + 2 cm due to the compression of the spring)

Substituting, we find

[tex]\Delta U = (40 kg)(9.8 m/s^2)(4.02 m) = 1577 J \sim 1600 J[/tex]

V=IR

35=I(175)

*Divide both sides by 175*

0.2=I

C. 0.200 A

Hope this helps!!

The current in a lightbulb with a voltage of 35.0 V and a resistance of 175 ohm is 0.2 A.

Given:

As the equation is given,

V= IR

where I is current, R is resistance and V is the voltage.

Now, I = V/R

As the value of Voltage and resistance of the lightbulb is given, we will put in the above equation, we get;

I = 35.0/ 175 A

I = 0.2 A.

Hence, the current of the lightbulb is 0.2 A.

Therefore, Option C is the correct answer.

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Chlorine and bromine would likely share electrons to form a covalent bond, not a common reaction. Answer C is correct, as halogens generally share electrons when bonded together.

When chlorine reacts with bromine, the outcome depends on the specific conditions of the reaction, such as the presence of other substances and the reaction environment. However, chlorine and bromine are both halogens, and a reaction between them is not typical because they are both nonmetals with high electronegativity. Chlorine is more electronegative than bromine, but not enough to draw electrons away from bromine to form an ionic bond. Instead, if they were to react directly, they would most likely form a covalent bond where electrons are shared between the atoms. Therefore, the most applicable answer to this particular multiple-choice question would be, "C. Electrons are shared between the Chlorine atoms and the Bromine atoms."

It's important to note that this type of reaction isn't common, and the halogens more typically form compounds with metals, where a metal donates electrons to the halogen, as in the formation of ionic bonds such as sodium chloride (NaCl). An example of such electron transfer is seen when sodium (Na), which has a low ionization potential, reacts with chlorine (Cl), which has a high electron affinity, resulting in the chlorine atom gaining an electron and sodium donating one.

Answer:

Buoyant force.

Explanation:

When we are immersed in a pool of water, we experiences a force pushing us in upward direction due to which our weight is decreased and this force is called Buoyant force.

This is also called upthrust.

Answer: Buoyant force

Explanation:

Answer:

Your answer will be 6.0kg•m/s

Explanation:

In the given question all the required details d given. Using these information's a person can easily find the momentum of the object. In the question it is already given that the mass of the object is 5 kg and the velocity at which it is traveling is 1.2 m/s.We know the equation of finding momentum asMomentum = mass * velocity                   = 5 * 1.2                    = 6So the momentum of the object is 6 Newton.

Answer:

Momentum of an object, p = 6 kg-m/s

Explanation:

It is given that,

Mass of an object, m = 5 kg

Velocity of that object, v = 1.2 m/s

We need to find the momentum of an object. It is equal to the product of mass and its velocity. Mathematically, it is given by :

p = m v

[tex]p=5\ kg\times 1.2\ m/s[/tex]

p = 6 kg-m/s

So, the momentum of an object is 6 kg-m/s. Hence, this is the required solution.

Answer:

your answer would be Sebaceous glands

Explanation:

these glands secrete oil/wax called sebum to lubricate and waterproof your skin. Hope this helps :)

"The correct term for the glands responsible for lubricating the skin and minimizing water loss is sebaceous glands.

The skin has several types of glands, each with a specific function. Sebaceous glands are the glands that produce sebum, an oily substance that lubricates the skin and hair. Sebum helps to form a protective layer on the skin's surface, which serves multiple purposes:

1. It prevents the skin from drying out by reducing water loss through the epidermis, which is the outermost layer of the skin.

2. It provides a barrier against foreign pathogens and substances, helping to protect the skin from infections.

3. It contributes to the skin's flexibility and suppleness.

 These glands are located all over the body, except for the palms of the hands and the soles of the feet, and are usually associated with hair follicles. The secretion of sebum is an essential process for maintaining healthy skin and hair.

In summary, sebaceous glands play a crucial role in skin health by secreting sebum, which lubricates and waterproofs the skin, thereby minimizing water loss and protecting against external threats."

The answer is torque.

The turning effect of force is torque.

Answer:

The turning effect of force is called Torque

Answer:

Testable

Explanation:

A good hypothesis must always be testable.

Answer:

Must be testable and falsifiable

Answer:

23.5 m/s

Explanation:

The velocity of the car in decelerated motion is given by

v = u + at

where

v = 0 is the final velocity

u is the initial velocity

a is the acceleration of the car

t = 3.0 s is the time it takes for the car to stop

The acceleration of the car is given by the frictional force, which is the only force acting on the car along the direction of motion, so:

[tex]ma = -\mu mg\\a = -\mu g = -(0.80)(9.8 m/s^2)=-7.84 m/s^2[/tex]

where

[tex]\mu=0.80[/tex] is the coefficient of friction

Solving the previous equation for u, we find the initial velocity:

[tex]u=v-at=0-(-7.84 m/s^2)(3.0 s)=23.5 m/s[/tex]

Answer:

as a result of its motion

Explanation:

Explanation:

The kinetic energy of an object is given by due to its motion. Mathematically, it is given by :

[tex]E_k=\dfrac{1}{2}\times m\times v^2[/tex]

Where

m = mass of an object

v = velocity

The kinetic energy of an object depends on its mass and the velocity with which it is moving. So, basically kinetic energy of an object depends on its motion.                            

Answer:hot

Explanation:

Ice don’t move at all. cold makes it move slowly. Room temperature it’s ok it might be kinda fast but hot water moves fastest.

Answer: Option (D) is the correct answer.

Explanation:

In a hot source, molecules will have more kinetic energy. As a result, they tend to move randomly and at a rapid rate from their initial position.

So, when a wave travels through hot source then vibrations caused by it will also move at a faster rate due to high kinetic energy in the molecules of the source.

Whereas in ice or cold source molecules have very less kinetic energy. As a result, these molecules will be held much more closer to each other.

So, when a wave travels through it then it will find difficulty to pass through the molecules as they are held closer to each other due to which there is very less or no vacant space for the wave to pass on from one end to another.

At room temperature, a wave will travel less fast as compared to wave in a hot source.

Thus, we can conclude that in hot source of water would a wave travel the fastest.

The plant absorbs the sunlight which serves as source of energy for the plant. Therefore, the form of energy which gets converted to “chemical potential energy is the solar energy”.

Explanation:

In process of photosynthesis, the plant makes the food and release oxygen, this occurs only in presence of solar energy that is sunlight. Therefore, the source of energy for the plants are sunlight which provides solar energy which is used up in energy conversion through various process.

The end product of the energy resource is the conversion to chemical potential energy gained over the growth of the cereal plants.