HELP!!!!

A student did an experiment to determine the
specific heat capacity of an unknown metal.
She heated 1.00 x 10- kg of the metal to 225°C
and quickly placed it in an insulated container
(negligible specific heat capacity) that contained
0.0900 kg of water at a temperature of 18.0°C.
What is the final temperature of the water if the
specific heat capacity of the metal is
2.11 x 102 J/kg.°C?

Answer:

Any food made from wheat, rice, oats, cornmeal, barley, or another cereal grain is a grain product. Anything else is not

Explanation:

An autobiography, like a memoir, is the writer's recounting of his or her life and is written in the first person, making the writer the protagonist of the narrative.

Contemporary/Realistic: In order to accurately portray our environment and society, realistic fiction develops fictional people and circumstances. Growing up and dealing with social and personal issues are the main themes. Characters in this genre are depicted as they learn about both themselves and others.

Historical and contemporary fiction make up realistic fiction's two subgenres. Unlike current fiction, which takes place in the present or recently past, historical fiction takes place at a period that is far enough back in history to be deemed history.

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Answer: the answer is b

Explanation:

edge

Answer:

1.9

Explanation:

The molality of a solution prepared from 5.25 g LiF and 45.0 g H2O is 4.49 m LiF.

Molality is useful in many chemical applications, particularly in the study of colligative properties of solutions. Colligative properties are properties of solutions that depend only on the concentration of solute particles and not on their chemical identity. Examples of colligative properties include boiling point elevation, freezing point depression, and osmotic pressure.

Molality is often used in laboratory settings where accurate measurement of concentration is important. It is also used in industrial processes such as the production of pharmaceuticals, where precise control of concentration is critical. In summary, molality is an important measure of concentration that is widely used in chemistry to describe the properties and behavior of solutions.

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Complete Question: -

Molality is a common unit of concentration which is used when temperature changes are a factor since its value will not change with temperature.

Molality is calculated by determining the number of moles of the solute, or the substance being dissolved, in 1 kilogram of solvent. This is summarized as follows:

Molality (m) = moles of solute/1 kg of solvent

What is the molality of a solution prepared from 5.25 g LiF and 45.0 g H2O?

Answer:

Here is something that may help you!!

Explanation:

I found it in a cite (not that I'm plagiarizing, or anything).

From conservation of energy, the potential energy will begin to reduce as soon as it starts to fall to the ground to gain kinetic energy.

Conservation of energy state that energy can not be created nor destroyed but can only be transformed from one form to another.

Given that a football is punted to its maximum height. At this maximum height, the kinetic energy is zero while the potential energy is maximum.

As soon as it starts to fall to the ground it starts to gain kinetic energy. And what will happen to the potential energy of the football as it starts to gain kinetic energy is the reduction of the potential energy.

Therefore, the potential energy will begin to reduce as soon as it starts to fall to the ground to gain kinetic energy.

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An action which could increase the pair's angular velocity is the figure skater on the left pointing his right arm down instead of up.

Angular velocity simply refers to the rate of change of angular displacement of a physical object (body) with respect to time.

This ultimately implies that, angular velocity is a measure of how fast and quickly a physical object (body) rotates with respect to another point or how its angular displacement (position) changes with respect to time.

In this scenario, an action which could increase the pair's angular velocity is when the figure skater on the left points his right arm down instead of up.

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the skater on the left pulls the skater on the right closer to him

Explanation:

apex bliches

Answer:

the air particles dont move as fast in the cold air as in warm, so it doesnt push as often and shrinks.

Explanation:

see above

could you vote me brainliest plz? thx :)

Since the air molecules in cold air travel more slowly than they do in warm air, the air pushes less frequently and contracts.

Refraction is the process by which a wave changes direction while transitioning through one medium to another in physics. As an illustration, waves move much faster in the open ocean than in the shallow.

A tsunami will swing until it is moving perpendicular to the coastline if it is approaching a beach at an angle because the wave's outermost layer goes quicker than its inner portion. In warm air compared to cold, sound waves move more quickly. A lake's surface cools at night, and any sound waves that ascend are bent down by the warmer upper levels of the atmosphere. Because of their varying speeds, the electromagnetic waves which make up light are distorted when they move through a clear substance.

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The mass density of the violin A4 string should be approximately 1800 kg/m^3.

The mass density of a string can be calculated using the following formula:

ρ = T / ((π/4) * d^2 * L)

where:

ρ is the mass density of the string in kg/m^3

T is the tension in Newtons (N)

d is the diameter of the string in meters (m)

L is the length of the string in meters (m)

π is the mathematical constant pi, approximately equal to 3.14159

We are given the length of the violin A4 string (L = 0.35 m) and the tension on the string (T = 60 N). We are asked to find the mass density of the string (ρ).

The diameter of the string (d) is not given, so we cannot solve for it directly. However, we can make an assumption about the diameter based on typical values for violin strings.

A common diameter for a violin A4 string is 0.6 mm, or 0.0006 m. We will use this value for d.

Now we can solve for ρ:

ρ = T / ((π/4) * d^2 * L)

ρ = 60 N / ((π/4) * (0.0006 m)^2 * 0.35 m)

ρ ≈ 1800 kg/m^3

Therefore, the mass density of the violin A4 string should be approximately 1800 kg/m^3.

What is mass density?

Mass density, also known as density, is a measure of how much mass is contained within a given volume of a substance. It is usually denoted by the Greek letter rho (ρ) and is expressed in units of kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3).

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The change in the Gibb's free energy per mole (G) is 1.96 J.

The given parameters:

The change in the Gibb's free energy per mole (G) is calculated as follows;

\(\Delta G = V(P_2-P_1) \\\\\)

where;

V is the volume of the ice

\(Density = \frac{Mass}{Volume} \\\\Volume = \frac{Mass}{Density} \\\\Volume = \frac{18 \times 10^{-3} \ kg}{917 \ m^3} \\\\Volume = 1.96 \times 10^{-5} \ m^3\\\\Volume = 1.96 \times 10^{-5} \ m^3 \times \frac{1000 \ L}{m^3} \\\\Volume = 0.0196 \ L\)

Change in pressure;

\(P_2 - P_1 = 2.0 \ bar \ - \ 1.0 \ bar = 1.0 \ bar = 0.987 \ atm\)

The change in the Gibb's free energy per mole (G);

\(\Delta G= V(P_2-P_1)\\\\\Delta G = 0.0196\ L \times 0.987\ atm \\\\\Delta G = 0.0193 \ L.atm\\\\1 \ L.atm = 101.325 \ J\\\\\Delta G = 0.0193 \ L.atm \times \frac{101.325 \ J}{1 \ L.atm} \\\\\Delta G = 1.96 \ J\)

Thus, the change in the Gibb's free energy per mole (G) is 1.96 J.

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At 30°C, the rms speed of a sample of oxygen with a molar mass of 16 g/mol is approximately 482.34 m/s.

The root mean square (rms) speed of a gas molecule is a measure of the average speed of the gas particles in a sample. It can be calculated using the formula:

vrms = √(3kT/m)

Where:

vrms is the rms speed

k is the Boltzmann constant (1.38 x 10^-23 J/K)

T is the temperature in Kelvin

m is the molar mass of the gas in kilograms

To calculate the rms speed of oxygen at 30°C (303 Kelvin) with a molar mass of 16 g/mol, we need to convert the molar mass to kilograms by dividing it by 1000:

m = 16 g/mol = 0.016 kg/mol

Substituting the values into the formula, we have:

vrms = √((3 * 1.38 x 10^-23 J/K * 303 K) / (0.016 kg/mol))

Calculating this expression yields the rms speed of the oxygen sample:

vrms ≈ 482.34 m/s

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Answer:

a)40 meters

b)2 m/s

c)2 m/s

d)0 m/s

e)45 degrees northeast

Explanation:

a) The displacement from C to A is the distance directly across the river, which is 40 meters.

b) The speed of the boat as seen by people standing at A is the magnitude of the boat's velocity vector, which is equal to the displacement divided by the time taken:

Speed = displacement / time = 40 m / 20 s = 2 m/s.

c) Let v be the speed of the water in the river. The boat is moving at right angles to the flow of the river, so the water exerts a perpendicular force on the boat. The time taken for the boat to travel from A to C is 20 seconds, during which time the boat will have been carried downstream by the river by a distance equal to v times the time taken.

Distance carried downstream = v × time = v × 20 m.

Since the boat landed at C, which is directly across the river from A, the distance it traveled horizontally is 40 meters. Therefore:

40 m = (boat speed) × (time taken) = (boat speed) × 20 s.

Hence, the speed of the boat is:

Boat speed = 40 m / 20 s = 2 m/s.

So, we have two equations:

Distance carried downstream = v × 20 m

Boat speed = 2 m/s

From the first equation, we get:

v × 20 m = 40 m

Therefore, the speed of the water in the river is:

v = 40 m / 20 m = 2 m/s.

d) The speed of the boat as seen by a fish drifting with the river is the difference between the speed of the boat and the speed of the water in the river:

Boat speed - Water speed = 2 m/s - 2 m/s = 0 m/s.

So, the speed of the boat as seen by a fish drifting with the river is zero.

e) The boat should head in a direction that makes its velocity vector point directly from A to B. Since A and B are directly opposite each other, this means the velocity vector should be perpendicular to the line connecting A and B.

We know the boat's velocity vector has a magnitude of 2 m/s and is at right angles to the velocity vector of the water in the river, which has a magnitude of 2 m/s. So, we can draw a vector diagram with the velocity vector of the boat pointing straight up and the velocity vector of the water pointing straight to the right. The vector connecting the tail of the water velocity vector to the head of the boat velocity vector will then point directly from A to B.

The angle between the boat's velocity vector and the line connecting A and B can be found using trigonometry. Let θ be this angle. Then:

tan(θ) = (boat speed) / (water speed) = 2 m/s / 2 m/s = 1.

Taking the inverse tangent of both sides gives:

θ = tan^(-1)(1) = 45°.

So, the boat should head in a direction 45 degrees to the right of straight up, or northeast.

A) Torque exerted on the pivot point P by force F is: 17.02 Nm  B)  torque exerted on the pivot point P by force F at an angle of 56.3 degrees above the radial line is: 13.83 Nm.

Torque is a measure of the rotational force on any object around an axis or pivot point.

A) Torque = Force x Lever arm

Given force F is 51.2 N and the lever arm is 33.3 cm.

Lever arm = 33.3 cm = 0.333 m

Therefore, torque exerted on the pivot point P by the force F is:

Torque = 51.2 N x 0.333 m = 17.02 Nm

B) If the force F is applied at an angle of 56.3 degrees above the radial line,  Perpendicular force = Force x sin(angle)

Perpendicular force = 51.2 N x sin(56.3°) = 41.48 N

The lever arm is still 0.333 m. Therefore, torque exerted on the pivot point P by force F at an angle of 56.3 degrees above the radial line is:

Torque = Perpendicular force x Lever arm = 41.48 N x 0.333 m = 13.83 Nm.

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(a) When the system does work on the surroundings, the change in the internal energy is - 700 J.

(b) When the surroundings performs work on the system, the change in the internal energy is 3,700 J.

The change in the internal energy of the system is determined by applying the first law of thermodynamics as shown below.

Mathematically, the formula for first law of thermodynamics is given as;

ΔU = Q ± W

where;

When the system does work on the surroundings, the equation is given as;

ΔU = Q - W

ΔU = 1500 J - 2200 J

ΔU = -700 J

When the surroundings performs work on the system, the equation is given as;

ΔU = Q + W

ΔU = 1500 J + 2200 J

ΔU = 3,700 J

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Answer:

Pin, rightwards

Explanation:

The acceleration of the rocket will be "56.2 m/s²".

According to the question,

The initial speed during launch,

The speed at fuel running out point,

Height,

           = 1250 m

As we know,

→ \(vf^2 = u^2+2ah\)

or,

→    \(a = \frac{v_f^2-u^2}{2h}\)

By putting the values, we get

→       \(=\frac{(375)^2-(0)^2}{2\times 1250}\)

→       \(=\frac{140625}{2500}\)

→       \(= 56.2 \ m/s^2\)

Thus the above solution is correct.

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Answer:

Component

Explanation:

All circuits have some basic parts, called components. One component is the power source, also called a voltage source. The power source is what pushes the electricity through the circuit.

The ball will strike the ground after 8.04 seconds.

Using the kinematic equation for displacement:

y = y0 + v0t - 1/2g*t^2

where:

We want to findt, let's substitute the values:

0 = 58.52 + 19.50t - 1/2(9.81)*t^2

4.905t^2 - 19.50t - 58.52 = 0

Using the quadratic formula:

t = (-b ± sqrt(b^2 - 4ac)) / 2a

where:

t = (-(-19.50) ± sqrt((-19.50)^2 - 4(4.905)(-58.52))) / 2(4.905)

t = (19.50 ± 31.37) / 9.81

The two possible solutions are:

t1 = 5.61 s (ball on the way up)

t2 = 8.04 s (ball on the way down)

Since the question is asking for when the ball strikes the ground, we take the larger solution, which is:

t = 8.04 s

In other words, the ball will strike the ground after 8.04 seconds.

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Answer: 12,339

Explanation:

Answer:

2.1m/s towards your grandmother's house

Explanation:

Given parameters:

Time taken  = 204s

Distance  = 430m

Unknown:

Velocity  = ?

Solution:

The velocity is determined by:

    Velocity  = \(\frac{displacement}{time}\)  

   Velocity  = \(\frac{430}{204}\)   = 2.1m/s towards your grandmother's house

Answer:

Explanation:

The charge must be negative so that force in a downward electric field will be upward so that its weight is balanced .

Let the charge be - q .

force on charge

= q x E where E is electric field

= q x 680

weight = 1.6 x 10⁻³ x 9.8

so

q x 680 = 1.6 x 10⁻³ x 9.8

q = 1.6 x 10⁻³ x 9.8 / 680

= 23 x 10⁻⁶ C

- 23 μ C .

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 Shiny

Explanation:

Trust me it's right

Energy conservation is the principle that energy is neither created nor destroyed, but can only be converted or transferred. It involves using energy-efficient appliances and transitioning to renewable energy sources to reduce consumption and environmental impact.

Energy conservation refers to the principle that energy cannot be created or destroyed; it can only be converted from one form to another or transferred between systems. This principle is based on the law of conservation of energy, also known as the first law of thermodynamics. In other words, the total amount of energy in a closed system remains constant over time.

One example of energy conservation is the use of energy-efficient appliances in households. By using appliances that are designed to minimize energy waste, such as energy-saving light bulbs, efficient refrigerators, or insulated windows, individuals can reduce their energy consumption and lower their electricity bills. These appliances are designed to convert electrical energy into useful forms, such as light or heat, with minimal energy losses.

Additionally, energy conservation plays a crucial role in sustainable practices and environmental preservation. For instance, reducing reliance on non-renewable energy sources like fossil fuels and transitioning to renewable energy sources such as solar or wind power helps conserve natural resources and reduces greenhouse gas emissions.

In summary, energy conservation is the principle that states energy cannot be created or destroyed but can only be converted or transferred between different forms. By adopting energy-efficient practices and utilizing renewable energy sources, individuals and society can contribute to conserving energy and mitigating environmental impact.

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The question probable may be:

Explain the concept of energy conservation and provide an example of how it applies in real-life situations.

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) T1 = 269.63 K

T2 = 192.59 K

B) W = -320 KJ

Explanation:

We are given;

Initial volume: V1 = 7 m³

Final Volume; V2 = 5 m³

Constant Pressure; P = 160 KPa

Mass; m = 2 kg

To find the initial and final temperatures, we will use the ideal gas formula;

T = PV/mR

Where R is gas constant of helium = R = 2.0769 kPa.m/kg

Thus;

Initial temperature; T1 = (160 × 7)/(2 × 2.0769) = 269.63 K

Final temperature; T2 = (160 × 5)/(2 × 2.0769) = 192.59 K

B) world one is given by the formula;

W = P(V2 - V1)

W = 160(5 - 7)

W = -320 KJ

So let's simplify the circuit

This section has two resistors in series, therefore they can be combined like this.

Now that we can simplify these two resistors like this, let's simplify the next two.

This is because 1/T = 1/5 + 1/5; and therefore T = 2.5

After simplifying all the resistors, we get the total resistance is 2.5 ohms

a. traction

If your vehicle has a high center of gravity or if the surface traction is less than ideal, it is important to enter a curve slower than the posted speed. This is because vehicles with a high center of gravity or poor surface traction are more prone to instability and are more likely to roll over or lose control when negotiating sharp turns or curves at high speeds.

Traction refers to the friction or grip between the tires of a vehicle and the road surface. Poor surface traction can be caused by a variety of factors, such as wet or slippery roads, loose gravel or debris, or worn or damaged tires. When surface traction is poor, it becomes more difficult for the tires to maintain contact with the road and to transmit the forces of acceleration, braking, and steering to the road.

By entering a curve slower than the posted speed, you can reduce the lateral forces acting on your vehicle and give your tires more time to grip the road. This can help you maintain control and stability, and reduce the risk of accidents or injuries. It is important to always adjust your speed and driving style to suit the conditions of the road and the capabilities of your vehicle.

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Answer:

Diffrent

Explanation:

Electrical energy is electrical charges moving. When you play soccer kinetic energy is used. Kinetic energy is the movement of atoms, objects, and electrons.