Cristina mixed 10kg of water at 70° with 20 kg of water at 20°C,if an equilibrium temperature of 40°C was obtained,find the heat absorbed by the mass of 20kg.A:400 kcalB:300 kcalC:450kcalD:350 kcal

Answer:

b) the earth did not orbit the sun

Explanation:

The sun appears to move through the background stars due to parallax . Parallax is a phenomenon when the near object appears to move faster than the distant object . If we travel in a train , the near object like electric poles on rail track or trees and fields nearby appear to move faster against the distant background .

Hence when the earth moves around the sun , the sun appears to move against the background the stars which are far away . Had earth remained stationary at a place on its orbit around the sun , the sun would have appeared stationary against the background the   stars .

The earthquake would occur 13 minutes before 10:05 a.m. which will be at 9.52 am.

The p-waves travel with a constant velocity of 7 km/s

The time can be calculated by using the formula

t = d / v

where

T1 =  10:05 a.m

d is the distance they take to travel from the epicenter

v is the speed of the p-waves

On average, the speed of p-waves is

v = 7 km/s

d = 5600 km (given)

Substituting the values in the formula;

t = d / v

t = 5600 ÷ 7

t = 800 seconds

Converting into minutes,

t = 800 ÷ 60

t = 13.3

≈ 13 mins

T1 -  13 mins = T2

10:05 - 13 mins = 9.52 am

It means the earthquake occurred prior 13 minutes, that is at 9.52 am.

Therefore, the earthquake occurred at 9.52 am.

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Answer: A liquid to gas

Explanation: I just got it wrong :(

In solid state, particles are closely packed and have no space to move past. When they gain a thermal energy, they get enough energy to move past each other and starts to converts liquid state. Thus, option B is correct.

Phase transition is a physical process in which substance changes from one state to other. Like a solid substance changes to liquid or liquid changes to gas etc.

In solid state the particles are closely packed and have no space to move across. Whereas in liquids state, particles have some space to move thus they flow and have no definite shape.

In gaseous state, particles are far apart and they are spread over the atmosphere. When substances gain energy to reduce the intermolecular force of attraction and moves away. Therefore, the the solid particles changes to liquid form when they get enough thermal energy.

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Answer:

If there are more molecules present, or there's a bigger surface area on which the reaction happens, there will be more successful collisions and the reaction will go faster. Also, if the temperature is higher, more molecules will have enough energy to react, and the reaction will be faster.

Answer: Endothermic  Reaction

Explanation: Photosynthesis requires energy right, making it an endothermic reaction. Light, generally sunlight, is the source of this energy. The process converts the sun's electromagnetic energy into chemical energy, which is then stored in chemical bonds in the plant. Which then leads to Photosynthesis occuring.

Answer:

The rate of rotation is 1123.6 rpm.

Explanation:

diameter of tub =50 cm

radius of tub, r = 25 cm = 0.25 m

Acceleration, a = 3 g

The centripetal acceleration is given by

\(a = r w^2\\\\3\times 9.8 =0.25 \times w^2\\\\w = 117.6 rad/s\\\\w = 2\pi n \\\\117.6 = 2\times 3.14 \times n\\\\n = 18.73 rps = 1123.6 rpm\)

Answer:

It will turn back into a solid but it will take some time.

Explanation:

Answer:

15.7

Explanation:

Since N1 sin(angle1)= N2 sin(angle2), you can set up the equation to find the missing angle using inverse sin( 1.00 sin(21.2)/ 1.33). You would then get that the other angle is equal to 15.7 or 15.8 if you round up. I hope this helped! :)

Answer:

15.7

Explanation:

Acellus

An electron in a Hydrogen atom goes from the n=3 energy level to the n=1 energy level by emitting light. The energy of this light is (E)= 19.38×10⁻¹⁹ J.

Energy is a physical term. If a object is affected by some forces and move a distance that means object has some energy. It can be measured in Joule.

To calculate the energy we are using the formula,

E= hc/λ

To calculate the energy we have to calculate the wavelength= λ  first, we are using the formula,

1/λ=R[(1/n₁²)-(1/n₂²)]

Here we are given,

R= the Rydberg constant.=1.097×10⁷ /m

n₁= the final energy level.=1

n₂= the initial energy level.=3

we have to calculate the wavelength. = λ m

Now we put the values in above equation we get,

1/λ=R[(1/n₁²)-(1/n₂²)]

Or, 1/λ= 1.097×10⁷×[(1/1²)-(1/3²)]

Or,  1/λ= 1.097×10⁷×[(1/1)-(1/9)]

Or,  1/λ=0.975×10⁷ /m

Now we put the value in first equation, we get

E= hc/λ

Here we are given,

h=  the Planck's constant.= 6.626×10⁻³⁴ J.s

c= The speed of light.= 3×10⁸ m/s

we have to calculate the energy. = E J

Now we put the values in above equation,

E= hc/λ

Or, E= 6.626×10⁻³⁴×3×10⁸×0.975×10⁷

Or, E= 19.38×10⁻¹⁹ J

From the calculation we can say that, The energy of this light is (E)= 19.38×10⁻¹⁹ J.

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Answer:

All atoms have a dense central core called the atomic nucleus. Forming the nucleus are two kinds of particles: protons, which have a positive electrical charge, and neutrons, which have no charge. All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is.

Explanation:

Answer:

The total surface area of the seven little spheres is 1.91 times the total surface area of the bigger sphere.

Explanation:

Volume of a Sphere

The volume of a sphere of radius r is given by:

\(\displaystyle V=\frac{4}{3}\cdot \pi\cdot r^3\)

The volume of each little sphere is:

\(\displaystyle V_l=\frac{4}{3}\cdot \pi\cdot 2^3\)

\(V_l=33.51\ mm^3\)

When the seven little spheres coalesce, they form a single bigger sphere of volume:

\(V_b=7*V_l=234.57\ mm^3\)

Knowing the volume, we can find the radius rb by solving the formula for r:

\(\displaystyle V_b=\frac{4}{3}\cdot \pi\cdot r_b^3\)

Multiplying by 3:

\(3V_b=4\cdot \pi\cdot r_b^3\)

Dividing by 4π:

\(\displaystyle \frac{3V_b}{4\cdot \pi}= r_b^3\)

Taking the cubic root:

\(\displaystyle r_b=\sqrt[3]{\frac{3V_b}{4\cdot \pi}}\)

Substituting:

\(\displaystyle r_b=\sqrt[3]{\frac{3*234.57}{4\cdot \pi}}\)

\(r_b=3.83\ mm\)

The surface area of the seven little spheres is:

\(A_l=7*(4\pi r^2)=7*(4\pi 2^2)=351.86\ mm^2\)

The surface area of the bigger sphere is:

\(A_b=4\pi r_b^2=4\pi (3.83)^2=184.33\ mm^2\)

The ratio between them is:

\(\displaystyle \frac{351.86\ mm^2}{184.33\ mm^2}=1.91\)

The total surface area of the seven little spheres is 1.91 times the total surface area of the bigger sphere.

Temperature of iron (Ti) = 415 °C Temperature of water (Tw) = 15.0 °CTemperature at equilibrium (Te) = 100 °CMass of water (m) = 0.625 kgMass of steam evaporated (ms) = 0.144 kgHeat lost by iron (Q1) = Heat gained by water (Q2) + Heat required to evaporate steam .

Heat lost by iron  = (mass of iron (m) x specific heat capacity of iron (c) x change in temperature of iron (ΔT1))Heat gained by water = (mass of water (m) x specific heat capacity of water (c) x change in temperature of water (ΔT2))Heat required to evaporate steam  = (mass of steam (ms) x specific latent heat of vaporization of water (L))Now, using the above formula we can calculate the mass of the iron block as:

Q3m x c x ΔT1 = m x c x ΔT2 + ms x L

Let's calculate the value of Q1 first.

Q1 = m x c x ΔT1m = Q1 / (c x ΔT1)

We know that

c = 450 J/kg °C and ΔT1 = Ti - Te = 415 - 100 = 315°CQ1 = m x c x ΔT1= m x 450 J/kg

°C x 315°C= 141750 m Jm = Q1 / (c x ΔT1)= 141750 / (450 x 315)= 1.002 kg

Now, let's calculate the value of Q3.Q3 = ms x L= 0.144 kg x 2.26 x 10^6 J/kg= 325440 J

Now, let's calculate the value of Q2

.Q2 = m x c x ΔT2m = (Q2 + Q3) / (c x ΔT2)

We know that ΔT2 = Te - Tw = 100 - 15 = 85°CQ2 = m x c x ΔT2= 0.625 kg x 4186 J/kg °C x 85°C= 276981.25 JNow, let's calculate the mass of the iron block.m =

(Q2 + Q3) / (c x ΔT2)= (276981.25 + 325440) / (450 x 85)= 1.003 kg

Hence, the mass of the iron block is 1.003 kg rounded off to 3 significant figures.

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Goal posts at the end of football field are padded as a safety measure to players who might run into them,these thick paddings of the goal posts are done to prevent injuries to the players because the padding of the goal post increases the time of impact and this in-turn decreases the force on the the players body or the force it will have when a player's body hit against it and therefore decreasing the force applied to bring the player to a stop.

We can also say that it increases the time of collision between the player's body and the post.

Answer:

the initial velocity of the  ball is 17.14 m/s

Explanation:

Given;

maximum height reached by the ball, h = 15 m

let the initial velocity of the ball = u

at maximum height, the final velocity of the ball is zero, v = 0

The initial velocity of the ball is calculated by using the following upward motion kinematic equation;

v² = u² - 2gh

0 = u² - 2(9.8 x 15)

u² = 294

u = √294

u = 17.14 m/s

Therefore, the initial velocity of the  ball is 17.14 m/s

List these drinks in order of kinetic energy, starting with the drink whose particles have the highest kinetic energy:

hot chocolate > juice > milk > water.

The average kinetic energy of the particles in an object is measured by its temperature. The velocity of these particles likewise increases as the temperature rises.

A thermometer or a calorimeter is used to determine the temperature. In other words, a system's internal energy is determined by its temperature.

Hence, the kinetic energy of molecules is proportional to temperature of the liquid. So, list these drinks in order of kinetic energy:

hot chocolate > juice > milk > water.

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When a positive scaler is multiplied by a vector changes only the magnitude of vector but not the direction of the vector. Therefore, option (4) is correct.

Answer:

It determines how long you do a certain workout.

Answer: B

Explanation: B is the correct statement describing the positions of the Moon, the Sun, and the Earth during a new moon. The Moon is between Earth and the Sun.

During a new moon, the Moon is positioned between the Sun and the Earth, with the illuminated side of the Moon facing away from the Earth. This means that the side of the Moon that faces the Earth is not receiving any sunlight, making it invisible to us from Earth. The new moon is the first phase of the lunar cycle and occurs roughly every 29.5 days.

The momentum of the blobs after the collision of a 1 kg blob of putty moving at 10 m/s with another 1 kg stationary blob will be 5 m/s.

The term "completely inelastic collision" is used to describe every time two masses cling together after colliding. Any inelastic collision will result in the internal energy of the objects being transformed into kinetic energy. Because of this, even though the system's energy is conserved (no outside forces are at action), its internal energy is changing in an unknowable and unpredictable fashion. This implies that the concept of energy conservation in inelastic collisions is absolutely meaningless to us. However, the conserved quantity that we can monitor is momentum.

Initial momentum is expressed as p = m1v1 + m2v2,

where, I denotes vector quantities.

v2 = 0  (because the second blob is at rest).

As a result, p=m1v1, |p|=m1|v1|=1*10= 10 kg*m/s,

The total amount of momentum is conserved in a closed system. The end momentum is 10 kg*m/s and is therefore also directed in the same direction as the beginning momentum.

The combined mass is now M=m1+m2= 1+1 = 2 kg due to the fact that two blobs are now clumped together. As a result, p = mv= 10 =2v; from this, v= 10/2 = 5 m/s, headed in the same direction as the first blob's starting velocity.

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Answer:

B) work-energy

Explanation:

It is the work-energy theorem as there is no theorem called "mass-acceleration theorem" [unless you consider Newton's Second Law (maybe?) but not really].

Its postulates are :

The wavelength of this wave is the distance between two consecutive points in the curve.

Wavelength is the distance between two successive peaks or troughs in a wave. It is the physical quantity that is used to measure the frequency of a wave. Wavelength can be used to measure a variety of waveforms, including electromagnetic waves, such as light and radio waves, sound waves, and even gravitational waves. Wavelengths are typically measured in meters or centimeters. The shorter the wavelength, the higher the frequency of the wave.

a) Wavelength: The wavelength of this wave is the distance between two consecutive points in the curve. In this case, the distance between points A and B is approximately 10 cm. Therefore, the wavelength is 10 cm.

b) Speed: The speed of this wave is equal to the product of its wavelength and frequency. The frequency of this wave can be calculated by dividing the time between the two snapshots (10 ms) by the distance between two points (10 cm). This gives a frequency of 0.1 Hz. Therefore, the speed of this wave is equal to its wavelength times its frequency, or 1 cm/s.

c) Frequency: As calculated above, the frequency of this wave is 0.1 Hz.

d) Amplitude: The amplitude of this wave is the difference in height between its maximum and minimum values. In this case, the maximum value is at point B (3 cm) and the minimum value is at point A (2 cm). Therefore, the amplitude of this wave is 1 cm.

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The stationary spectator hears a frequency of approximately 175 Hz as the car approaches, and the stationary spectator hears a frequency of approximately 146 Hz as the car moves away.

Frequency refers to the number of cycles of a periodic waveform that occur in a unit of time, usually measured in Hertz (Hz). It is a fundamental concept in physics and is used to describe a wide range of phenomena, from sound waves to electromagnetic radiation.

a) The frequency heard by a stationary spectator as the car approaches can be calculated using the formula:

f' = f * (v + v_s) / (v + v_source)

where f is the frequency emitted by the source (engine), v is the speed of sound in air (approximately 343 m/s), v_s is the speed of the spectator (assumed to be zero), and v_source is the speed of the source (engine).

Substituting the given values, we get:

f' = 160 * (343 + 0) / (343 + 40) ≈ 175 Hz

Therefore, the stationary spectator hears a frequency of approximately 175 Hz as the car approaches.

b) The frequency heard by a stationary spectator as the car moves away can also be calculated using the same formula:

f' = f * (v - v_s) / (v - v_source)

where v_s is still zero, but v_source is now negative since the car is moving away from the spectator. Substituting the given values, we get:

f' = 160 * (343 - 0) / (343 - (-40)) ≈ 146 Hz

So, the stationary spectator hears a frequency of approximately 146 Hz as the car moves away.

Therefore, When the car is coming closer, the stationary observer hears a frequency of about 175 Hz, and when it is leaving, they hear a frequency of about 146 Hz.

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The total distance of Bella's trip through the jungle is 24 kilometers.

To find the total distance of Bella's trip, we need to calculate the distance traveled during each leg of her journey and then sum them up.

Let's calculate the distance traveled in each segment:

Trekking in the thick jungle:

Bella trekked for 1 hour at an average speed of 6 km/h.

Distance = Speed × Time

Distance = 6 km/h × 1 hour

Distance = 6 km

Crossing the lake by boat:

Bella rode a boat at an average speed of 20 km/h for 0.5 hours.

Distance = Speed × Time

Distance = 20 km/h × 0.5 hour

Distance = 10 km

Hiking for the remaining part:

Bella hiked for 2 hours at an average speed of 4 km/h.

Distance = Speed × Time

Distance = 4 km/h × 2 hours

Distance = 8 km

Now, let's calculate the total distance:

Total distance = Distance of trekking + Distance of crossing the lake + Distance of hiking

Total distance = 6 km + 10 km + 8 km

Total distance = 24 km

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Answer:

a. 0.32 m/s²

b. 12.5 s

Explanation:

We know that the final velocity vf = 8 m/s, the initial velocity vi = 4 m/s and the distance traveled x = 150 m. Then, we can calculate the acceleration using the following equation

Replacing the values, we get

Therefore, the acceleration of the runner was 0.32 m/s²

Now, the amount of time elapsed is equal to

Therefore, the amount of time elapsed during the change of velocity was 12.5 seconds.

Answer:

Asalamalikum maryam

Following are the characteristics that help to distinguish between man's and women's voice

The potential energy of the roller coaster is 176,400 J (joules).

The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.

In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).

Using the formula, we can calculate the potential energy:

PE = mgh

= (900 kg)(9.8 \(m/s^2\))(20 m)

= 176,400 J

Therefore, the potential energy of the roller coaster is 176,400 J (joules).

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Answer:

b

Explanation:

convert heat energy into mechanical