100 g of water at 25 °C is poured into an insulating cup. 50 g of ice at 0 °C is added to the water. The water is stirred until the temperature of the water has fallen to 0 °C. 18 g of ice remains unmelted. The specific heat capacity of water is 4.2 J / g °C. Which value does this experiment give for the specific latent heat of fusion of ice? ​

Answer:The correct answer should be C. is filled with medication used to administer a fixed amount of medication per inhalation through the mouth.

Explanation:

Answer:

c. is filled with medication used to administer a fixed amount of medication per inhalation through the mouth.

Answer:

10.2 mL.

Explanation:

From the question given above, the following data were obtained:

Original Volume (V₁) at temperature θ₁ = 500 mL

Initial temperature (θ₁) = 5 °C

Final temperature (θ₂) = 22 °C

coefficient of volume expansion (γ) = 1200×10¯⁶ / °C

Rise in volume (ΔV) =?

Next, we shall determine the volume (V₂) of the methanol at 22 °C. This can be obtained as follow:

Original Volume (V₁) at temperature θ₁ = 500 mL

Initial temperature (θ₁) = 5 °C

Final temperature (θ₂) = 22 °C

coefficient of volume expansion (γ) = 1200×10¯⁶ / °C

Volume 2 (V₂) at temperature θ₂ =?

γ = V₂ – V₁ / V₁ (θ₂ – θ₁)

1200×10¯⁶ = V₂ – 500 / 500 (22 – 5)

1200×10¯⁶ = V₂ – 500 / 500 × 17

1200×10¯⁶ = V₂ – 500 / 8500

Cross multiply

V₂ – 500 = 1200×10¯⁶ × 8500

V₂ – 500 = 10.2

Collect like terms

V₂ = 10.2 + 500

V₂ = 510.2 mL

Thus, the volume of the methanol at 22 °C is 510.2 mL

Finally, we shall determine the rise in volume of methanol as illustrated below:

Original Volume (V₁) at temperature θ₁ = 500 mL

Volume (V₂) at temperature θ₂ = 510.2 mL

Rise in volume (ΔV) =?

ΔV = V₂ – V₁

ΔV = 510.2 – 500

ΔV = 10.2 mL

Thus, 10.2 mL of the methanol will overflow when the temperature reaches 22 °C.

Natural gas, hydrogen, electricity, hybrid vehicles, biofuels, five major alternative energy sources in transportation. Producing energy from fossil fuels no releases of greenhouse gases, lowering forms of pollution.

The relative ease with which petroleum-derived fuels may be stored and utilized in internal-combustion engines accounts for their supremacy. However, they need a more intricate storage system than other fossil fuels, such as natural gas, gas, and methanol, which can also be utilized as transportation fuels.

Use your personal automobiles sparingly. When possible, strive to use public transportation. Reduce the car's additional BOOT weight. Unnecessary objects like a flat tire and unwanted luggage—especially hefty ones—in the car might lower its mileage.

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Two parallel conducting plates are charged with equal and opposite charges. Then the correct statement about the magnitude of the electric potential is greater at point B.

Here electric field exists between the positive and negative plates. Its direction will be from the positive plate to the negative plate. The electrostatic potential is the work done in moving a unit charge in the electric field. The relationship between the electric field and electric potential is electric field is the negative gradient of electric potential.

E = -dV/dr

V = -∫E.dr

E.dr = E×dr×cos(theta)

Here on moving from the positive plate to the negative plate Electric field and distance are in the same direction.

Hence the value of the angle theta between them will be 0 degrees. Then we will potential as negative. That is on moving from the positive plate to the negative plate potential decreases. So, point B near the positive plate is having higher potential compared to others.

Point A is outside the plates where the electric field and hence potential is zero.

This question is accompanied by an image and Option B is the correct one.

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Answer:

Ex; If the robot traveled 20 cm around the octagon then the circle circumference = 20 cm

Use the equation circumference = 2 π radius to calculate radius(C = 2πr)

          If circumference = 20cm;  radius = circumference / ( 2 π) = 20/6.28= 3.18 cm. Use your scale to express your answer in meters, km, etc

now set the protractor distance measure as 3.18 cm, place the protractor's metal spike at the octagon center and draw the circle.

Explanation:

Answer:

144 meters

Explanation:

the ball is thrown with a speed of 24 meters per second right so if the ball reaches the ground in 6 seconds. the hight of the cliff must be S=v.t

S (height cliff)=24m/s×6s=144

Answer:

15 A (15 amperes of current)

Explanation:

From Ohm's Law,

Voltage, V = Current, I × Resistance, R

Making Current, I the subject:

Current, I = Votage, V/ Resistance,R

= V/R

= 120volts /8ohms

= 15 A

Answer:

Group 1A (or IA) of the periodic table are the alkali metals: hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Explanation:

Hope it helps! Correct me if I am wrong :>

(a) The impulse of the force is 8 N.s

(b) The final velocity of the object if it is initially at 5.33 m/s

(c) The final velocity of the object if it is initially moving along the x - axis with velocity of 22.0 m/s is 3.33 m/s

The change in momentum is equal to the product of impact force applied while colliding and time for that impact.

Impulse = F. Δt  = m (Vf -Vi)

where, Vf is the final velocity and Vi is the initial velocity.

Given, the force shown in the force vs. time diagram acts on a 1.5-kg object.

(a) Impulse is given by

Impulse = F. Δt

Put the values, we get

Impulse = 2x3 + 1/2 x2x2

Impulse = 6+2 = 8N.s

Thus, the impulse from the graph is 8 N.s

(b)

Impulse= F. Δt  = m (Vf -Vi)

Substitute the values into the expression, we get

8 = 1.5 x (Vf  - 0)

Vf  = 5.33 m/s

Thus, the final velocity of the object if it is initially at 5.33 m/s

(c)

Impulse= F. Δt  = m (Vf -Vi)

Substitute the values into the expression, we get

8 = 1.5 x (Vf  +2)

Vf  = 3.33 m/s

Thus the final velocity of the object if it is initially moving along the x - axis with velocity of 22.0 m/s is 3.33 m/s.

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Answer:

Ionic charges refer to the electrical charges of ions, which are atoms or molecules that have gained or lost electrons. These charges result from the loss or gain of electrons during chemical reactions.

When an atom loses one or more electrons, it becomes a positively charged ion known as a cation. The cation carries a positive charge equal to the number of electrons lost.

Conversely, when an atom gains one or more electrons, it becomes a negatively charged ion known as an anion. The anion carries a negative charge equal to the number of electrons gained.

The magnitude of the ionic charge depends on the number of electrons gained or lost, which is determined by the element's position in the periodic table and its electron configuration. For example, sodium (Na) loses one electron to become a +1 charged cation (Na+), while chlorine (Cl) gains one electron to become a -1 charged anion (Cl-).

Explanation:

density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.

The relative density of a substance is defined as the ratio of the density of that substance to the density of water at 4oC. It is also defined as the ratio of the mass of substance to the mass of equal volume of water at 4oC. i.e., R.D. = Mass of the substance / mass of an equal volume of water at 4oC

Answer: A

Explanation:

No Jackie is not correct. UV rays are highly energetic relative to visible light and lower energy radiation like microwave or radio. UV rays are most definitely enough to damage human skin. If you have a bottle of sunscreen near you, it will say it protects from UV rays. UV rays is what causes sunburn.

Answer:

A

Explanation:

Im   sure that its A because it provides evidence of this anwser

Answer:

- the power rating of the resistance heater is 24139.5 W

- the inner surface temperature of the pipe at the exit is 96.34°C

Explanation:

Given the data in the question;

Flow rate of water in the tube V" = 5L/min = 8.333 × 10⁻⁵ m³/s        

The water is to be heated from 10°C to 80°C;

so Average or mean temperature \(T_{avg\) will be;

\(T_{avg\) = (T₁ + T₂) / 2 = (10 + 80) / 2 = 90/2 = 45°C

Now, from the Table " Properties of Water " at average temperature;

at \(T_{avg\) = 45°C

density p = 990.1 kg/m³

specific heat \(C_p\) = 4180 J/kg-k

thermal conductivity k = 0.637 W/m-°C

Now, we determine the mass flow;

m" = pV"

we substitute

m" = 990.1 × 8.333 × 10⁻⁵

m" = 0.08250 kg/s

we know that the power rating of the resistance heater is equal to the heat transfer rate to the water;

Q' = m"\(C_p\)( T₂ - T₁ )

we substitute

Q' = (0.08250 × 4180 ) ( 80 - 10 )

Q' =  344.85 × 70

Q' = 24139.5 W

Hence, the power rating of the resistance heater is 24139.5 W

Next, we determine the average velocity of water in the tube;

\(V_{avg\) = V" / \(A_c\)

\(V_{avg\) = V" / ( \(\frac{1}{4}\)πD² )

given that;  flows through a 2-cm-internal-diameter; D = 0.02 m

we substitute

\(V_{avg\) = (8.333 × 10⁻⁵) / ( \(\frac{1}{4}\)π × (0.02)² )

\(V_{avg\) = (8.333 × 10⁻⁵) / ( 3.14159 × 10⁻⁴ )

\(V_{avg\) =  0.265 m/s

Also, from table " saturated water property table "

At 45°C

viscosity μ = 0.596 × 10⁻³ kg/m-s

Prandtl number Pr = 3.91

Now, we determine the kinematic viscosity

v = μ / p

we substitute

v = ( 0.596 × 10⁻³ ) / 990.1

v = 6.01959 × 10⁻⁷ m²/s

so, Reynolds number in the flow region will be;

Re = (\(V_{avg\) × D) / v

we substitute

Re = ( 0.265 × 0.02) / (6.01959 × 10⁻⁷)

Re = 8804.586

we can see that our Reynolds number (  8804.586 ) more than 2300 and less than 10,000.

Hydraulic and thermal entry length are equal in this flow region,

such that;

\(L_h\) = \(L_t\)

⇒ 10 × D = 10 × 0.02 = 0.2 m

we can see that the entry length ( 0.2 m ) is smaller than the given length ( 13 m ) in the question; the flow is a turbulent flow.

So we the Nuddelt number

Nu = \(0.023Re^{0.8} Pr^{0.4\)

Nu = 0.023 × \(8804.586^{0.8\) × \(3.91^{0.4\)

Nu = 56.8

Hence, the heat transfer coefficient h will be;

h = \(\frac{k}{D}\) × Nu

we substitute

h = \(\frac{0.637}{0.02}\) × 56.8

h = 31.85 × 56.8

h = 1809.1 W/m²-°C

Now, area of the heat transfer will be

A\(_s\) = πDL

we substitute

A\(_s\) = π × 0.02 × 13

A\(_s\) = 0.8168 m²

Finally we determine the inner temperature of the pipe at exit. using the relation;

Q' = hA\(_s\)( T₃ - T₂ )

we substitute

24139.5 = 1809.1 × 0.8168( T₃ - 10 )

24139.5 = 1477.67288( T₃ - 80 )

24139.5 = 1477.67288T₃ - 118213.8304

24139.5 + 118213.8304 = 1477.67288T₃

1477.67288T₃ = 142353.3304

T₃ = 142353.3304 / 1477.67288T

T₃ = 96.34°C

Therefore, the inner surface temperature of the pipe at the exit is 96.34°C

Answer:

Therefore, the force required to accelerate a 500 kg object at a rate of 10 m/s^2 is 5000 Newtons (N).

Explanation:

The force required to accelerate an object can be calculated using the formula:

force = mass x acceleration

where "mass" is the mass of the object being accelerated, and "acceleration" is the rate at which the object's velocity is changing.

In this case, the mass of the object is 500 kg, and the acceleration is 10 m/s^2. Plugging these values into the formula gives:

force = mass x acceleration

force = 500 kg x 10 m/s^2

force = 5000 N

Therefore, the force required to accelerate a 500 kg object at a rate of 10 m/s^2 is 5000 Newtons (N).

The velocity, measured in the Earth reference frame, of an inertial reference frame in which the cat's kinetic energy does not change is equal to the velocity of the skier before the collision. The velocity of the skier before the collision is 15 m/s.

According to the law of conservation of momentum, the total momentum before the collision must be equal to the total momentum after the collision. This can be expressed as m1*v1 + m2*v2 = (m1 + m2)*vf, where m1 and m2 are the masses of the skier and the cat respectively, v1 is the velocity of the skier, and vf is the velocity of the skier and the cat after the collision.

The kinetic energy converted to internal energy in the Earth reference frame can be determined by applying the law of conservation of momentum.

The amount of kinetic energy converted to internal energy can be calculated as follows:

m1*v1 = (m1 + m2)*vf

vf = (m1*v1)/(m1 + m2)

KE = (1/2)*m2*v2²

KE converted = KE initial - KE final

KE converted = (1/2)*m2*v2² - (1/2)*m2*((m1*v1)/(m1 + m2))²

KE converted = (1/2)*m2*v2² - (1/2)*m2*((60*15)/(60 + 5))²

KE converted = (1/2)*5*3.8² - (1/2)*5*(15²/65)

KE converted = 28.8 - 22.15

KE converted = 6.65 J

The velocity, measured in the Earth reference frame, of an inertial reference frame in which the cat's kinetic energy does not change is equal to the velocity of the skier before the collision.

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(a) The volume of asphalt needed is 6400 m³.

(b) The number of dump truck loads required is 320.

(c) The gross mass of each truck is 34400 kg.

The dimension of the two-lane highway 20 km long, 8 m wide, and 4 cm thick.

The mass of a dump truck is 20 metric tons, and carrying capacity is 20 m³ and the density is 0.72 g/cm³.

The two-lane highway:

length, l = 20 km = 20 × 10³ m

breadth, b = 8 m

Thickness, h = 4 cm = 4 × 10⁻² m

(a) The volume of the asphalt will be:

V = l × b × h

V = 20 × 10³ × 8 × 4 × 10⁻² m³

V = 64 × 10² m³

V = 6400 m³

V = 6400 × 10⁶ cm³

(b) The carrying capacity of 20 m³ asphalt.

Therefore, the number of truckloads required will be:

= 6400 m³ / 20 m³

= 320

(c) Now,

Density, d = 0.72 g/cm³ = 720 kg/m³

The empty mass is 20 metric tons which is equal to 20 ×10³ kg.

Therefore, the gross mass of each truck will be

m = 20 ×10³ kg + 720 kg/m³ × 20 m³

m = 20000 kg + 14400 kg

m = 34400 kg

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Answer: when the ground is very hot and the air is cool. The hot ground warms a layer of air just above the ground. When the light moves through the cold air and into the layer of hot air it is refracted (bent). A layer of very warm air near the ground refracts the light from the sky nearly into a U-shaped bend.

Explanation:

In the circuit on the right, the capacitor is initially uncharged a) When the switch is closed in the circuit, the initially uncharged capacitor starts charging through the resistor (bulb).; b) If the capacitor were twice as large, it would take a longer time to charge, since it has a greater capacity to store charge.; c) If the bulb had half as much resistance, the current in the circuit would increase.

a. When the switch is closed in the circuit, the initially uncharged capacitor starts charging through the resistor (bulb). As the capacitor charges, the current in the circuit decreases, which causes the bulb to gradually dim. Eventually, the capacitor becomes fully charged, the current stops flowing, and the bulb goes off.
b. If the capacitor were twice as large, it would take a longer time to charge, since it has a greater capacity to store charge. Consequently, the bulb would take a longer time to dim and eventually go off.
c. If the bulb had half as much resistance, the current in the circuit would increase. As a result, the capacitor would charge faster, and the bulb would dim and go off more quickly.

The behavior of an RC circuit with a capacitor and a resistor depends on the values of the resistance and capacitance in the circuit. The time for the capacitor to charge and discharge depends on the time constant of the circuit, which is proportional to the product of the resistance and capacitance. A larger resistance or capacitance will cause the circuit to respond more slowly, while a smaller resistance or capacitance will cause the circuit to respond more quickly.

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Answer: A. New, high-tech materials are used to make prosthetic limbs for  people who need them

Explanation:

Engineering is an immensely important science to us as humans for through its development of tools, machines, engines and structures, human lives have been made better in just about every field.

One of these fields is the medical field. In the past people who lost limbs could say good bye to a normal life or at least a semblance of one but now, due to advancements in Engineering, high-tech materials can now be used to make prosthetic limbs for people who need them.

The magnetic field strength of the solenoid of radius 2 m is 2.0096 T.

Magnetic field is the region or space around which magnetic force is felt or experienced.

To calculate the magnetic field strength inside a solenoid, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the magnetic field strength is 2.0096 T.

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When a ball is dropped from a height, its velocity increases linearly due to gravity.

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Answer:

B. 0.45

Explanation:

You just need to plug this into a calculator.

Answer:

= 24.04  B  

Explanation:

Vertical component is found by

   26.43  *  sin 65.43°       <==== I do not know the units 'B'

The value added by the baker is $3. The bread's contribution to GDP is the final sale price of the bread, which is $6

In this scenario, each person involved in the production and sale of the bread adds value to the final product. The concept of value added refers to the increase in the market value of a product at each stage of production.

The farmer grows the wheat and sells it for $1. The value added by the farmer is $1.

The miller processes the wheat into flour, increasing its value. The miller sells the flour to the baker for $3, so the value added by the miller is $3 - $1 = $2.

The baker uses the flour to make bread, further adding value to the product. The baker sells the bread to the engineer for $6, so the value added by the baker is $6 - $3 = $3.

The engineer consumes the bread, but since no further economic value is added, there is no additional value added by the engineer.

The bread's contribution to GDP (Gross Domestic Product) is the final sale price of the bread, which is $6. GDP measures the total value of all goods and services produced within a country's borders, and the sale of the bread represents the final output of the production chain.

Overall, the value added at each stage contributes to the final price of the bread, and the final sale price of the bread represents its contribution to GDP.

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Answer:

sugar

Explanation:

Answer:

Explanation:

It's graph A because the pressure in the tire is increasing as the amount of air going into it increases. B says the pressure drops exponentially as air goes in, and C says that the pressure stays the same as air goes in. Pressure in a tire increases proportionally to the amount of air in it.

Answer:

a)\(F_{net} =275000N\)

b)\(F_{net}'= 386718.75N\)

Explanation:

From the question we are told that:  

Man's Mass \(M=75kg\)

Speed of man \(V_m=5.5m/s\)

a)

Landing time \(t_l=1.5ms\)

Generally the equation for average net force F_{ net}  is mathematically given by

\(F_{net} = 75 *5.5 /(0.0015) N\)  

\(F_{net} =275000N\)

b)

Landing time \(t=0.08s\)

Generally the equation for average net force\(F_{ net}\)  is mathematically given by

\(F_{net}' = impulse /time \\ F_{net}'= \frac{m * u}{t}\)

\(F_{net}'= \frac{75 * 5.5}{0.08}\)

\(F_{net}'= 386718.75N\)