PRACTICE IT Use the worked example above to help you solve this problem. An ideal gas at 24.3°C and a pressure 1.70 x 105 Pa is in a container having a volume of 1.00 L. (a) Determine the number of m

The speed of a person is the ratio of the distance travelled to the time taken. The speed of the person run up to 400 m in 72 seconds is 5.5 m/s.

Speed is a physical quantity measuring the distance covered by an object per unit time. The rate of speed is called the velocity. The change in magnitude of speed causes velocity.

The average speed of an object depends on the mass of the object. if the object covers greater distance within  short time, the object is having greater speed.

Given that, distance  = 400 m

time taken = 72 s

speed = distance/ time

           = 400/72 = 5.5 m/s

Therefore, the speed of the person is 5.5 m/s.

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Answer:

Magma from the core

Explanation:

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To determine the position u of the mass at any time t, we can use the equation of motion for a mass-spring system without damping:n m * u''(t) + k * u(t) = 0

m = 2 lb / (32.2 ft/s^2) = 0.062 lb·s^2/ft

The spring constant k can be determined using Hooke's law:

k = F / x

where F is the force exerted by the mass and x is the displacement. In this case, the force F is the weight of the mass, and the displacement x is 6 in:

k = (2 lb) / (6 in) = (2 lb) / (6 in) * (1 ft/12 in) = 0.111 lb/ft

The equation of motion now becomes:

0.062 * u''(t) + 0.111 * u(t) = 0

To solve this second-order linear homogeneous differential equation, we assume a solution of the form u(t) = A * cos(ωt + φ).

Substituting this assumed solution into the equation of motion, we get:

-0.062 * A * ω^2 * cos(ωt + φ) + 0.111 * A * cos(ωt + φ) = 0

-0.062 * ω^2 + 0.111 = 0

Solving for ω, we get:

ω = sqrt(0.111 / 0.062) = 2.258 rad/s

From ω, we can determine the frequency f and period T:

f = ω / (2π) = 2.258 / (2π) ≈ 0.359 Hz

T = 1 / f ≈ 2.786 s

The amplitude A is determined by the initial conditions. When the mass is pulled down an additional 3 in (0.25 ft) and released, it reaches its maximum displacement, so A = 0.25 ft.

Therefore, the position u of the mass at any time t is given by:

u(t) = 0.25 * cos(2.258t)

To draw the graph of u(t), plot the position u on the y-axis and time t on the x-axis, using the equation u(t) = 0.25 * cos(2.258t). The graph will be a cosine wave with an amplitude of 0.25 ft.

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The change in the momentum of the bus is 10600 kg-m/s, if bus of 1600 kg crashes with a SUV of 600 kg.

The mass of the bus, m₁ = 1600 kg

The mass of the SUV, m₂ = 600 kg

Initial velocity of the bus, v₁ = 10 m/s

initial velocity of the SUV, v₂ = 0 (at rest)

Velocity of the bus after collision, v₃ = 3 m/s

Velocity of the SUV after collision, v₄ = 1 m/s

The change in momentum(Δp) is given by,

Δp = (m₁v₁ + m₂v₂) - (m₁v₃ + m₂v₄)

Δp = (1600 × 10 + 600 × 0) - (1600 × 3 + 600 × 1)

Δp = 16000 - 5400

Δp = 10600 kg-m/s

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The correct answer is c. alpha particles. Radon is a radioactive gas that can be found in homes and buildings. It is detected through the measurement of alpha particles, which are emitted by the decay of radon atoms.

This measurement is usually done using a device called a radon detector, which can provide an accurate reading of the radon levels in a home. It is important to regularly test for radon in order to ensure that the levels are safe for occupants.

Radon is detected in a home through the measurement of alpha particles.

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Explanation:

Hope this helps,

Juno entered a polar orbit of Jupiter on July 5th 2016 UTC, to begin a scientific investigation of the planet. After completing its mission, Juno will be intentionally deorbited into Jupiters atmosphere. Junos mission is to measure Jupiters composition, gravitational field, magnetic field, and polar magnetosphere.

Answer:

1

3

4

5

or

a

c

d

e

Explanation:

Answer:

a) (0.0004·\(\mathbf{\hat i}\) - 1.55·\(\mathbf{\hat j}\)) m

b) 0.31 km/h·\(\mathbf{\hat i}\) + 0.00008 km/h·\(\mathbf{\hat j}\)

Explanation:

The given parameters are;

The circular motion of the airplane = 600 km/hour

The radius of the circular path = 3 km

The time it takes the cup to reach the floor of the airplane is given as follows;

s = u·t + 1/2·g·t²

1.5 = 1/2 × 9.81 × t²

t² = 1.5/(1/2 × 9.81)

t = √(1.5/(1/2 × 9.81)) ≈ 0.553 s

The location of the plane in 0.533 s is 600 km/hour × 0.533 s ≈ 83.83 meters

The angular velocity, ω = v/r = 600 km/hour/3 km = 200°/hour

Therefore, the angle covered in 0.533 s is 0.533 s × 200°/hour ≈ 0.0296°

tan(0.0296)*3000 ≈ 1.55 m vertical

3000 - cos(0.0296)*3000 ≈ 0.0004 m horizontal

The location of the cup relative to the plane will be

0 - (-0.0004·i + 1.55·j) = 0.0004·i - 1.55·j m

b) The speed of the cup relative to the plane when it hits the floor is given by the

The speed of the plane = 600 km/hour × cos(90 - 0.0296)j + 600 km/hour × sin(90 - 0.0296)j = -0.31 km/hour·i + 599.99 km/hour·j

The speed of the cup = 600 km/hour·j

The relative speed = 600 km/hour·j - ( -0.31 km/hour·i + 599.99 km/hour·j) = 0.31 km/hour·i + 0.00008 km/hour·j

The relative speed of the cup to the plane = 0.31 km/h·i + 0.00008 km/h·j

Therefore, given that there will be no relative speed in an inertia frame, the speed of the cup relative to the plane will be higher than when dropped in an inertia frame

If the inner test tube contained water, the freezing point of the pure solvent would not be affected.

The freezing point of a substance is a characteristic physical property that is not impacted by the presence of another substance, such as water in the inner test tube. The freezing point of a pure solvent is only affected when a solute is added, which lowers the freezing point. Therefore, the presence of water in the inner test tube would have no effect on the freezing point of the pure solvent.

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The frequency difference between the emitted sound (407.83 Hz) and the reflected sound (413.81 Hz) is caused by the Doppler effect.

This effect occurs when there is relative motion between the source of sound (the boy on the bicycle) and the observer (the wall). The speed of the boy can be determined using the formula for the Doppler effect:
f' = f * (v + vo) / (v + vs)
Where f' is the reflected frequency (413.81 Hz), f is the emitted frequency (407.83 Hz), v is the speed of sound in air (340 m/s), vo is the velocity of the observer (the wall, 0 m/s), and vs is the velocity of the source (the boy, which we need to find).

413.81 = 407.83 * (340 + 0) / (340 + vs)
Solving for vs, we get:
vs = ((413.81 * 340) / 407.83) - 340
vs ≈ 4.91 m/s
Therefore, the boy is riding his bicycle toward the wall at a speed of approximately 4.91 meters per second.

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The energy technology that does not rely on a generator to produce electricity is D. photovoltaic solar.

Photovoltaic (PV) solar technology directly converts sunlight into electricity using solar panels. It does not require a generator to produce electricity. PV solar systems consist of solar panels made up of photovoltaic cells, which generate electricity when exposed to sunlight.

These cells utilize the photovoltaic effect, a process where sunlight excites electrons in the cells, creating a flow of electricity. The generated electricity can be used immediately or stored in batteries for later use.

This direct conversion of sunlight into electricity distinguishes PV solar technology from other energy technologies that rely on generators for electricity production.

Therefore, the correct option is D. photovoltaic solar

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Use Newton's second law.

The object's mass is the same everywhere, so first compute the mass using the object's weight on Earth:

F = ma   ⇒   59 N = m (9.8 N/kg)   ⇒   m ≈ 6.02041 kg

Now compute the acceleration on the other planet:

F = ma   ⇒   40.5 N ≈ (6.02041 kg) a

⇒   a ≈ 6.72712 m/s² ≈ 6.7 m/s² ≈ 1.5g

where g = 9.8 m/s², just to express this acceleration relative to the gravitational acceleration at Earth's surface.

Answer:

they both use power how much it has

Explanation:

i think

Answer:

1 horsepower is a unit of power equal to 746 watts 1 watt is a unit of power equal to 1 joule per second.

Explanation: Working on it for homework right now and using my textbook

Answer:

A, D, C

Explanation:

Part 1: The number of pathways in a circuit determines the possible routes for electric current to flow.

There are maximum of five pathways in this circuit, depending on its complexity and the arrangement of components.

Part 2: Determining whether the circuit is series or parallel requires more information.

In a series circuit, components are connected in a single path, and the current flows through each component sequentially.

If the circuit has only one pathway (zero or one pathway), it suggests a series circuit.

However, if the circuit has multiple pathways (two or more pathways), it indicates a parallel circuit.

To conclusively determine the circuit's nature, we need to analyze the circuit diagram or obtain additional details regarding the component connections and their interactions.

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An atom with great electronegativity is able to attract electrons towards itself in a chemical bond. This means that it is able to form strong covalent bonds with other atoms, and can also participate in ionic bonding by attracting electrons away from other atoms.

Additionally, an atom with high electronegativity is able to exert a greater degree of control over the distribution of charge within a molecule, making it an important factor in determining the overall reactivity and behavior of the molecule.

Electronegativity is a measure of an atom's ability to attract electrons towards itself when it is part of a chemical bond. In other words, it is a measure of an atom's ability to pull electrons away from other atoms in a molecule. Electronegativity is an important concept in chemistry, as it helps predict how atoms will behave in chemical reactions.

Electronegativity is typically measured on a scale called the Pauling scale, named after the American chemist Linus Pauling. The scale ranges from 0.7 (for the least electronegative element, francium) to 4.0 (for the most electronegative element, fluorine). Elements towards the right side of the periodic table, such as the halogens and oxygen, are generally more electronegative than elements towards the left side, such as the alkali metals.

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When you turn the ignition switch to the ENG STOP position after the engine fails to start, you must wait for approximately 15 seconds before attempting to start the engine again.

This waiting period allows the starter motor to cool down and prevents damage to the vehicle's electrical system.

The ENG STOP position cuts off fuel and ignition to the engine, effectively stopping its operation.

By turning the ignition switch to this position, you interrupt the starting process and give the starter motor time to rest.

Waiting for 15 seconds ensures that the starter motor is not overheated and allows it to regain its normal operating temperature.

This prevents potential damage to the motor and the vehicle's electrical system.

Once the 15-second waiting period has passed, you can then turn the ignition switch back to the RUN position and attempt to start the engine again.

If the engine still fails to start, it may be necessary to troubleshoot further or seek assistance from a qualified mechanic.

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Answer:

Calculating the question of whether or not to take it serious

Given:

• Mass of ice = 295 g ==> 0.295 kg

• Initial temperature, T1 = -5°C

• Final temperature, T2 = 20°C

Let's find the amount of heat necessary to change the ice to water.

To find the amount of heat, let's apply the Specific Heat Capacity formula:

Where:

m is the mass in kg = 0.295 kg

T1 is the initial temperature

T2 is the final temperature.

c is the specific heat capacity

Let's first find the amount of heat required to change ice from -5°C to 0°C.

Now, let's find the heat required to change from 0°C(ice) to 0°C(water).

We have:

Where L is the latent fusion of water:

Now, let's find the heat required to change 0°C (water) to 20°C(water).

We have:

Therefore, the total heat required is:

Q = Q1 + Q2 + Q3

Thus, we have:

Therefore, the amount of heat neccesary is

As the raindrops do not provide a continuous path to flow the electrons because the air between the rain droplets acts as an insulator, therefore, the person walking under an electric transmission line would not be electrocuted.

In physics, a conductor can be described as a type of material that allows the flow of charge in one or more directions. Electric current is produced by the flow of negatively charged electrons or ions in some cases.

Raindroplets have dissolved impurities which make them somewhat conductive of electricity, but conductors should be continuous to create a conducting path at normal voltages.

The electric current can only flow when there is a continuous path of conductive material providing a conductor for electrons to travel through. The continuous flow of electrons needs to be an unbroken path to allow it to flow.

Since the air can be considered an insulating material and an air gap separates prevents a continuous path has been broken therefore electrons cannot flow.

Therefore, due to the absence of the closed circuit, you would not be electrocuted during a rainstorm if you walked under an electric transmission line.

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Answer:

Copper

Explanation:

Ini kerana copper(aku lupa bm nya apa) mempunyai tahap ketebalan yang paling tinggi berbanding yang lain.

ps: tak sangka ada budak melayu kat sini. hahaha

have a good day ;)

The average speed of swimmer is 10 km/hr.

Speed is the rate of change of position of an object in any direction.

Distance is the total movement of an object without any regard to direction.

Given distance of pond is 1 km.

She swims 20 laps , i.e. total distance = 20 * 1 km = 20 km

Time taken to complete = 2 hr

There a relation between speed distance and time which is given by:                      

                         Speed = Distance / Time

                      ⇒Speed = 20/2 = 10 km/hr

So the average speed of swimmer is 10 km/hr.

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The values for the combustion heat and specific heat capacity given in the question are incomplete or possibly mistyped, making it difficult to provide an exact numerical answer. However, with the correct and complete values, you can use the above approach to calculate the mass of water that can be boiled.

To calculate the amount of water that can be boiled while lowering 8.4 kg of coal to release heat, we need to consider the heat released by the combustion of coal and the heat required to raise the temperature of the water.

First, let's calculate the heat released by the combustion of coal using the given combustion heat value of 27-10 J/kg:

Heat released = mass of coal * combustion heat

Heat released = 8.4 kg * 27-10 J/kg

Next, let's calculate the heat required to raise the temperature of the water from 0°C to its boiling point, which is 100°C:

Heat required = mass of water * specific heat capacity * temperature change

Heat required = mass of water * 4200 J/(kg·°C) * (100°C - 0°C)

To find the amount of water that can be boiled, we need to equate the heat released by the coal to the heat required to raise the temperature of the water:

Heat released = Heat required

8.4 kg * 27-10 J/kg = mass of water * 4200 J/(kg·°C) * 100°C

Now we can solve for the mass of water:

mass of water = (8.4 kg * 27-10 J/kg) / (4200 J/(kg·°C) * 100°C)

To calculate the amount of water that can be boiled while lowering 8.4 kg of coal to release heat, we need to consider the heat released by the combustion of coal and the heat required to raise the temperature of the water.

First, let's calculate the heat released by the combustion of coal using the given combustion heat value of 27-10 J/kg:

Heat released = mass of coal * combustion heat

Heat released = 8.4 kg * 27-10 J/kg

Next, let's calculate the heat required to raise the temperature of the water from 0°C to its boiling point, which is 100°C:

Heat required = mass of water * specific heat capacity * temperature change

Heat required = mass of water * 4200 J/(kg·°C) * (100°C - 0°C)

To find the amount of water that can be boiled, we need to equate the heat released by the coal to the heat required to raise the temperature of the water:

Heat released = Heat required

8.4 kg * 27-10 J/kg = mass of water * 4200 J/(kg·°C) * 100°C

Now we can solve for the mass of water:

mass of water = (8.4 kg * 27-10 J/kg) / (4200 J/(kg·°C) * 100°C)

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Different electromagnetic waves have different applications in our daily life.

Radiowaves: Radiowaves are mainly used for communication purposes, for example, cell phones and radios.

Microwaves: Microwave is used in communication. Microwaves are also used in the oven for cooking purposes.

Infrared waves: Infrared waves are used in tv remote controls, night visions, and for other thermal imaging.

X-rays: X-rays are mainly used for their application in the medical field. The images of broken bones and teeth are taken using x-rays. They are also used in cancer therapy. They are also used for security purposes in airport scanners.

Gamma rays;

Gamma rays are waves that have higher energy than all the other electromagnetic waves. They are used in the imaging of different body parts in the medical field.

As they have high energy a long exposure to gamma rays can cause cancer.

the first equation of motion, is determined as v = u + at.

The derivation of the first equation of motion by graphical representation​ is determined as follows;

Consider the diagram in the image attached;

Let, OE = time (t)

From the graph:

BE = AB + AE

v = DC + OD (QAB = DC  and AE = OD)

v = DC + v [QOD = u]

v = DC + v -------(1)

Now, Acceleration, a= Change in Velocity/ Time taken

a = (v – u)/ t

a = (OC – OD)/ t = DC/ t

at = DC --------(2)

By substituting the value of DC from (2) in (1):

We get:

v = at + u

v = u + at

Thus, the first equation of motion, is the relationship between the final velocity, initial velocity, acceleration and time of motion.

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Answer:

The atomic number tells us the number of protons.

Explanation:

Hope this helps and I hope u have an Amazing day!!

Answer:

mass 3.67 kg, density 600 kg/m3) is fitted

with lead (density 1.14 * 10^4 kg/m3) so that it floats in water with

0.900 of its volume submerged. Find the lead mass if the lead is fitted

to the block’s (a) top and (b) bottom.

This is due to the fact that occluded fronts combine two cold air masses, which causes one of the cold air masses to go downward.

When a warm air mass is sandwiched between two cold air masses, an occluded front occurs. In an occlusion, the warm front passes over the cold front, which dives beneath it.

In a front is obscured, the warm front is fully supplanted by the cold front, in which the warm air masses have completely disappeared. Furthermore, there are frequent shifts in the various weather producing circumstances because of the cold front's relatively low temperature.

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