A 7.0 g ice cube at -20 ∘C is in a rigid, sealed container from which all the air has been evacuated. Steam has CV = 1500 J/kg⋅K and CP = 1960 J/kg⋅K.
How much heat is required to change this ice cube into steam at 170 ∘C ?

lol i’m in your physical science class what was the answer

Answer: false.

Explanation:

Doppler effect is caused to the relative motion of the source of light/sound with respect to the observer.

If the source is moving towards you, you will perceive the frequency to be larger (also called a blue shift), while if the wave is moving away, you will perceive the frequency to be smaller (also called a red shift).

Then the statement:

"Doppler effect is caused by sound or light wave being pushed together and spread apart due to motion."

Is false

If a magnet is pushed faster toward a solenoid, the voltage induced in the solenoid will be greater.

If a magnet is pushed faster toward a solenoid, the voltage induced in the solenoid will be greater. This is due to Faraday's law of electromagnetic induction, which states that the magnitude of the voltage induced in a conductor is proportional to the rate at which the magnetic field lines passing through the conductor change.

When the magnet is pushed faster, the rate of change of the magnetic field lines passing through the solenoid increases, which in turn increases the induced voltage. Therefore, the faster the magnet is pushed, the greater the voltage induced in the solenoid.

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Answer:

Explanation:

Swimming. When you go swimming, your body floats but somewhat sinks as well because we weigh less when we're in the water. We are less dense.

Or taking a bath, the soap sinks to the bottom and the washcloth somewhat floats and sinks because of the air trapped in the middle. But the rest of the washcloth is sinking because it's absorbed the water which makes it denser.

Brainliest??

Answer:

These are all the forces acting on the ball: friction, gravity, and a normal force.

Explanation:

At the middle of the ramp their will be potential energy associated with the ball and the total  mechanical energy  will be equal to its potential energy  . At the bottom of the ramp their will be kinetic energy associated with the ball  and  total  mechanical energy  will be equal to its kinetic energy .

Mechanical energy is the energy that is possessed by an object due to its motion or due to its position.

Total mechanical energy = potential energy + kinetic energy

When ball is positioned in the middle of the ramp , the ball is at rest , which implies that total mechanical energy is equal to   potential energy possessed by the ball and their is no kinetic energy at that instant of time , after that it came under the action of forces due to which it rolls down and its potential energy starts converting into kinetic energy and the total mechanical energy will be the sum of potential as well as kinetic energy  and when it reaches at the bottom of the ramp the total mechanical energy will be kinetic energy of the ball.

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Answer:

read the explanation

Explanation:

Purchased electricity is fed into our TVs and is converted to light and sound.

Electricity goes into an electric bulb and is converted to visible light and heat energy.

Chemical Energy is converted to Electrical Energy (stove)

Chemical food energy is converted to Energy to Work (person running).

Answer:

Gasoline/chemical is put into our cars, and with the help of electrical energy from a battery, provides mechanical energy/ kinetic energy

red is sus

The mass of Sylvanite that you would need to dig up approximately 264.29 grams of sylvanite to obtain 74.0 grams of gold.

The quantity of anything is stated as though it were a fraction of a hundred. A quarter of 100 can be used to express the ratio. Per 100 is what the term percent signifies. The symbol ‘%’ is used to symbolize it.

To determine the amount of sylvanite needed to obtain 74.0 g of gold, we can use the fact that sylvanite contains 28.0% gold by mass.

Let's assume the mass of sylvanite required is represented by "m" (in grams).

The mass of gold in the sylvanite can be calculated as:

Gold mass = 28.0% of m = (28.0/100) * m = 0.28m

According to the problem, the gold mass required is 74.0 g. We can set up the following equation:

0.28m = 74.0

To solve for "m", we divide both sides of the equation by 0.28:

m = 74.0 / 0.28 ≈ 264.29

Therefore, to get 74.0 grammes of gold, you would have to dig out about 264.29 grammes of sylvanite.

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Answer:

(a)A person moves a distance of 3 km towards east, then 2 km towards north and then 3.5 km towards east.

Find :

(i) the distance covered by the person

3 km+2km+3.5km

And at least total distance 8.5 km

___________________________

(ii) the displacement of this motion.

Displacement is the length of the shortest path between the initial and the final position. It is a vector quantity (Vector quantities are the ones which have both magnitude,called speed and direction)

Here displacement can be found out using Pythagorean theorem

Displacement 2=2²+6.5²

Displacement=√4+42.25

Displacement=√46.25-6.8(approx)

___________________________

(b) Name the type of motion in which a body has uniform speed but not uniform velocity ?

In circulation motion body has constant speed but do not have constant velocity.

The initial speed of the projectile is 18.5m/s

Projectile motion is the motion of an object thrown into the air under gravity. Examples of projectiles include a fired bullet, a thrown javelin e t.c

When a projectile is launched horizontal, it's horizontal range is given as R = u(√2h/g)

R = 300ft = 91.44meters

h= 120m

therefore 91.44= u( √ 2×120/9.8)

91.44 = u ( √24.49)

91.44 = 4.95 u

divide both sides by 4.95

u = 91.44/4.95

u = 18.5m/s

therefore the speed of the projectile is 18.5m/s

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a. The hydroxide concentration required to initiate precipitation is 2.50 x 10⁻² M.

b. To lower the Al³⁺ concentration in the solution to 2.00 x 10⁻⁷ M, we can use the common ion effect by adding excess OH⁻ ions.

(A). To initiate the precipitation of Al³⁺ from a 2.50 x 10⁻² M solution of Al(SO₄)₃, the solubility product constant (Ksp) of aluminium hydroxide (Al(OH)₃) is determined. The balanced equation for the dissociation of Al₂(SO₄)₃ is:

Al₂(SO₄)₃(s) ⇌ 2Al³⁺(aq) + 3SO₄²⁻(aq)

The Ksp expression for aluminium hydroxide is Ksp = [Al³⁺][OH⁻]³.

At the point of precipitation, the concentration of Al³⁺ will be equal to the concentration of OH- ions.

Therefore, [Al³⁺] = [OH⁻].

Given [Al³⁺] = 2.50 x 10⁻² M,

So,the hydroxide concentration required to initiate precipitation is also 2.50 x 10⁻² M.

(B). To lower the Al³⁺ concentration in the solution to 2.00 x 10⁻⁷ M, we can use the common ion effect by adding excess OH⁻ ions.

As the desired concentration is much lower than the initial concentration, we can assume that the OH⁻ concentration will be equal to the change in Al³⁺ concentration.

By using the solubility product expression,

Ksp = [Al³⁺][OH⁻]³, and substituting the given values, we have (2.00 x 10⁻⁷+ Δ[Al³⁺])(Δ[Al³⁺])³ = (2.50 x 10⁻² - Δ[Al³⁺])(2.50 x 10⁻² - Δ[Al³⁺])³.

Solving this equation will yield the value of Δ[Al³⁺], which corresponds to the change in Al³⁺ concentration. Subtracting this value from the initial Al³⁺ concentration of 2.50 x 10⁻² M will give us the desired concentration of 2.00 x 10⁻⁷ M.

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Answer: Initial velocity is independent of the slope of the graph; that is, the acceleration. An object thrown downward still accelerates after release at the same rate as an object that is dropped.

Explanation: hope this helps

No.

A stone has the SAME acceleration whether you throw it down, throw it up, throw it sideways, or just drop it.

YOU decide the stone's initial velocity, but it always has the same acceleration after it leaves your hand.

Answer:

Gold is metallic, with a yellow color when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength.

Formula  --

Molecular Weight (lb/m o l)  28.96

Critical Temp. (°F)  N/A

Critical Pressure (p s i a)  N/A

Boiling Point (°F)  -317.8

Melting Point (°F)  N/A

Psat  70°F (p s i a)  (note 1)

Explanation:

Answer:41xm/s

Explanation:

Answer:41xm/s

Explanation:

I found this for you hope it helps.

Given data:

1) Runner jogged 40 m at a slow pace for 40 sec.

2) Stopped for 40 sec.

3) Again funs for 60 m in 20 sec.

Answer:

Vinegar is a homogenous mixture of acetic acid and water. As the mixture created has only one phase it is a solution. ... There are no chemical bonds created between water and the acid and it is possible to separate the two without breaking any chemical bonds.

Explanation:

It is the true statement, that if we double the force acting on a body, the acceleration will double.

In terms of both speed and direction, acceleration is the rate at which velocity varies over time. Acceleration refers to the change in speed or direction of an item or point travelling straight forward. Due to the constant change in direction, motion on a circle accelerates even while the speed is constant. Both impacts help to accelerate all other types of motion.

In order to be a vector quantity, acceleration must have both a magnitude and a direction. As a vector quantity, velocity is also. A time interval's velocity vector change divided by that interval's duration is the definition of acceleration.

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Answer:

When we increase the applied force (push harder), the frictional force will also increase until it reaches a maximum value. When the applied force is larger than the maximum force of static friction the object will move. ... For kinetic friction the value remains the same regardless of the magnitude of the applied force.

Explanation:

a) Velocity and acceleration of a car are parallel when the car is moving along a straight line in the same direction. For example, when a car is gaining speed as it moves forward in a straight line, both velocity and acceleration are directed in the same direction.

b) Velocity and acceleration of a car are anti-parallel when the car is moving along a straight line in the opposite direction. For example, when a car slows down while moving in a straight line, its acceleration is directed opposite to the direction of its velocity, or the other way around.

Answer:

a)

There is only one case where velocity and acceleration are parallel only when they are moving in the same direction.

b)

There are 3 cases where velocity and acceleration are antiparallel.

(i) When both are moving in different direction

   It means :

(ii) When the object is slowing down, where velocity and acceleration are in the opposite direction.

(iii) In case of motion reversal.

Explanation:

The weight of the combined system is 58,800 N.

To determine the weight of the combined system, we need to consider the weight of the plastic tank and the weight of the water it contains.

Step 1: Weight of the Plastic Tank

The weight of an object is given by the equation W = m ×  g, where W is the weight, m is the mass, and g is the acceleration due to gravity. Since the mass of the plastic tank is 6 kg, and the acceleration due to gravity is approximately 9.8 m/s², we can calculate the weight of the tank as follows:

W_tank = 6 kg ×  9.8 m/s² = 58.8 N

Step 2: Weight of the Water

The weight of the water is determined by its mass and the acceleration due to gravity. The density of water is given as 1000 kg/m³, and the volume of the tank is 0.18 m³. We can calculate the mass of the water using the equation m = density * volume:

m_water = 1000 kg/m³ × 0.18 m³ = 180 kg

Now, we can calculate the weight of the water:

W_water = 180 kg × 9.8 m/s² = 1764 N

Step 3: Weight of the Combined System

To find the weight of the combined system, we sum the weights of the tank and the water:

W_combined = W_tank + W_water = 58.8 N + 1764 N = 1822.8 N

Therefore, the weight of the combined system, consisting of the 6-kg plastic tank filled with water, is 1822.8 N.

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In conclusion, to calculate the exact value of the instantaneous current at time t = 2.6 s, we need to know the resistance in the circuit. Without this information, we can only provide a general explanation of how the current behaves based on the given source voltage function.

The instantaneous current in the circuit can be determined by applying Ohm's law, which states that the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R). In this case, the source voltage (vsource) is given as v0cos(2πft), where v0 represents the peak voltage and f is the frequency.
To find the instantaneous current at time t = 2.6 s, we need to know the value of the resistance in the circuit. Without this information, we cannot determine the exact value of the current.
However, we can still provide a general explanation of how the current changes with time in this circuit. Since the source voltage is a cosine function, the current will also be a cosine function with the same frequency and a phase shift. The amplitude of the current will depend on the value of the resistance.
In conclusion, to calculate the exact value of the instantaneous current at time t = 2.6 s, we need to know the resistance in the circuit. Without this information, we can only provide a general explanation of how the current behaves based on the given source voltage function.

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The statement "They have a positive charge and are present in the nucleus of an atom along with the neutrons" correctly describes protons.

Protons are small particles that make up the nucleus of an atom. They carry a positive charge and have a mass of approximately 1 atomic mass unit. The number of protons within an atom's nucleus defines its atomic number and thus its identity as an element.

For instance, carbon atoms have 6 protons, and oxygen atoms have 8 protons. Protons are vital building blocks of all atoms and play a significant role in the chemical behavior and reactions of elements.

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Answer:

Pressure and force are related, and so you can calculate one if you know the other by using the physics equation, P = F/A. Because pressure is force divided by area, its meter-kilogram-second (MKS) units are newtons per square meter, or N/m2.

The magnification of the image is -1, which means that the image is inverted with respect to the object.

Part A:
The mirror should be placed at a distance of 2r from the object so that a real image is formed on the wall. This is because, for a concave mirror, when the object is placed at a distance equal to the radius of curvature, the image formed is at the same distance on the other side of the mirror. So, the distance from the object to the mirror would be r, and the distance from the mirror to the image would also be r. Therefore, the total distance from the object to the image would be 2r.

Part B:
The magnification of the image can be calculated using the formula:

m = - di/do

where di is the distance of the image from the mirror and do is the distance of the object from the mirror. Since the image is formed on the wall, which is at a distance equal to the radius of curvature of the mirror, di = r. And, as mentioned earlier, the distance of the object from the mirror is also r. Substituting these values in the above formula, we get:

m = - r/r = -1

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Answer:

3.88 m/s North

Explanation:

We are given that

\(m_1=136kg\)

\(m_2=100 kg\)

\(v_1=6 m/s\)

\(v_2=1m/s\)

We have to find  the speed and direction of the two players

immediately after the tackle.

Using linear conservation of momentum

\(m_1v_1+m_2v_2=(m_1+m_2)v\)

Substitute the values

\(136\times 6+100\times 1=(136+100)v\)

\(916=236v\)

\(v=\frac{916}{236}\)

\(v=3.88m/s\)

Direction of  the two players  immediately after the tackle is North.

Answer:

B.Converts the voltage of a current source

A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. It can be designed to "step up" or "step down" voltages and works on the magnetic induction principle. ... When voltage is introduced to one coil, called the primary, it magnetizes the iron core.

MARK ME BRAINLIEST THANKS MY ANSWER PLEASE

Answer:

1st: Radiation

2nd: Conduction

3rd: Convection

Explanation:

I actually learned this before in school. Yay

Answer:

1.439 × 10¹¹ m is the answer.

Explanation:

1 light-second = 2.998 × 10⁸m

480 light-seconds = 480 × 2.998 × 10⁸

= 1439.04 × 10⁸

= 1.439 × 10¹¹

∴ 1.439 × 10¹¹ m is the answer.

The distance converted into the meter will be 1.439×10¹¹ m.In one light second, there are 2.998 ×10⁸ m.

Distance is a numerical representation of the distance between two objects or locations.

The distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.

The given data in the problem is;

The  distance between the sun and moon is,d= 480 light second

\(\rm d_m\) is the distance in meter

As we know,

\(\rm 1\ light\ second = 2.998 \times 10^8m \\\\ 480\ light\ seconds = 480 \times 2.998 \times 10^8\ m \\\\ d_m= 1439.04 \times 10^8 \\\\ d_m = 1.439 \times 10^{11}\)

Hence the distance converted into the meter will be 1.439×10¹¹ m.

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A wind of 180mph will place a force of 32400 Ib on a surface of 4ft².

The force of the wind blowing on a vertical surface varies jointly as the area of the surface and the square of the velocity.

If a wind of 60mph exerts a force of 20lb on a surface of 1/5 ft², how much force will a wind of 180mph place on a surface of 4ft²

A force of 1250lb is exerted

since the force of the wind varies jointly as the area of the surface and the square of the velocity,

let f = force

a = area

velocity =v

from the above statement, we find out that

f ∝ a * v²----1

that is  f = k * a * v²    -----2

where k is a coefficient of proportionality

since velocity of wind in mph, v =60

and force in lb = 20

and surface area = 1/5 ft²

from equation 2

20 = 1/5 * k * 60²

20 * 5 /3600 = k

25/9 = k

A wind of 180mph will place a force of on a surface of 4ft².

f = 25/ 9 *4 * 180²

f = 32400

Therefore, a wind of 180mph will place a force of 32400 Ib on a surface of 4ft².

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