what evidence is there that sound Travels through gases

A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a colloid. A heterogeneous mixture that has larger dispersed particles that settle over time is a suspension.

A heterogeneous suspension is a mixture of components in which the solid particles cannot dissolve into the solution and they can be easily observed, while a colloid consists of macroscopic substances.

Therefore, with this data, we can see that a suspension is any heterogeneous mixture where major solid particles are not mixed.

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Answer:

The second one

Answer:

The highness or lowness of sound

Explanation:

Answer:

C

Explanation:

in the leaves of a plant where photosynthesis occurs

Answer:

32 m/s

Explanation:

The speed of a bus is 30 m/s due East wrt the passenger

He also sees a  passenger on the bus walking to the back at 2 m/s.

We need to find the passenger's velocity relative  to the bus. As the observer sees that the bus and the passenger are moving in opposite direction. Let v is the relative velocity. So,

v = 30 m/s + 2 m/s

v = 32 m/s

Hence, the passenger's velocity relative  to the bus is 32 m/s.

Answer:

1m every 0.28 seconds

Explanation:

she travelled 5 m in 1.4 s, so divide it by itself, 1.4s divided by 5 m gets you 0.28s for 1m

If the albedo of a planet is 40% then it means that 40% of the sun's energy is reflected by the planet.

Albedo of a planet is the amount of solar energy that is reflected by a planet of surface. This term is used in astronomy to describe the reflective properties of a planet, satellite, or asteroids. Venus planet has the highest albedo in our solar system, which is 0.7 as a ratio of the light strikes the surface of the planet to the light reflected by the planet. Venus reflect 70% of the sunlight.

Albedo can be measured using  a pyranometer device or satellite imagery, which detects the solar radiation of shorter wavelength in the form of watts per square meter (W/sq m).  

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Answer:

Explanation:

Acceleration is the change in velocity with respect to time.

Acceleration = change in velocity/Time

Acceleration = final velocity - initial velocity/Time

Given initial velocity = 10m/s

Final velocity = 20m/s

Time taken = 4s

Acceleration = 20-10/4

Acceleration = 10/4

Acceleration =2.5m/s²

For the second part of the question:

Given parameters

initial velocity = 15m/s

acceleration = -3m/s²

time = 4seconds

a = v-u/t

-3 = v-15/4

cross multiply

-12 = v-15

add 15 from both sides

-12+15 = v-15+15

3 = v

Hence the final velocity of the car is 3m/s

If the distance between two point charges is tripled, the mutual force attraction between them will be reduced by a factor of 1 by 9th.

The square of the separation distance is inversely correlated with the electrostatic force which is the mutual force of attraction. F is therefore nine times smaller, or one-ninth the original value if the distance between the charges is made three times larger.

A point charge is defined as a charge which doesn't have any area or volume and hence it appears as a point.

The mutual force of attraction which is also referred to as the electrostatic force of attraction is defined as the force that exists between two charged particles in a 3D space.

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The body's response to a cold involves various immune cells and processes. Here is a simplified flow chart depicting the step-by-step response:

This flow chart demonstrates the coordinated response of B cells, helper T cells, macrophages, mucus production, lymph, cytokines, receptor proteins, antibodies, memory cells, and plasma cells in combating a cold virus and eventually eliminating it from the body.

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The total voltage drop across all resistors is equal to the battery voltage, which is 120 V. The formula to calculate the total resistance in a series circuit is: Rtotal = R₁ + R₂ + R₃

Rtotal = R₁ + R₂ + R₃

Rtotal = 5.0 + 7.5 + 9.5

Rtotal = 22.0 ohms

The total resistance in the circuit is 22.0 ohms.

The formula to calculate the total current in a series circuit is:

I = Vtotal / RtotalI

= 120 / 22.0I

= 5.45 A

The total current in the circuit is 5.45 A.

The formula to calculate the voltage drop across each resistor is:

V = IRV₁

= 5.45 A × 5.0 ohms

= 27.3 VV₂

= 5.45 A × 7.5 ohms

= 40.9 VV₃

= 5.45 A × 9.5 ohms

= 51.8 V

The voltage drop across resistor 1 is 27.3 V.

The voltage drop across resistor 2 is 40.9 V.

The voltage drop across resistor 3 is 51.8 V.

The total voltage drop across all resistors is equal to the battery voltage, which is 120 V.

Therefore, 27.3 V + 40.9 V + 51.8 V

= 120 V.

The total voltage drop across all resistors is equal to the battery voltage, which is 120 V.

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Answer:

The anwser is b

Explanation:

Answer:

the answer is B

I know  because i just did it

1. The part that shows the body is accelerating is the first 2 hours (ABE). The acceleration is 20 Km/h²

2. The part that shows the body is coming to rest the last 2 hours (CDF)

3. The distance travelled in the first 2 hours is 40 Km

Acceleration is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

From the diagram (ABE), we can see that the body starts from rest and attain a final velocity (40 Km/h) within the first 2 hours. This clearly indicates that the body is accelerating.

The acceleration can be obtained as followed:

a = (v – u) / t

a = (40 – 0) / 2

a = 20 Km/h²

From the diagram (CDF), we can see that the object velocity changes from 40 to 0 within the last 2 hours. This clearly indicates that the object caming to rest.

v² = u² + 2as

v² = 2as

s = v² / 2a

s = 40² / (2 × 20)

s = 40 Km

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Answer: 12

Explanation: Acellus

The voltage at the equipment decreases as the line current rises because of the conductor's rising voltage drop. By lowering the voltage drop in the conductor, an improved power factor raises the equipment's voltage.

The maximum power that a resistor can dissipate before failing catastrophically is parameterized by the resistor's power rating. As you may be aware, power is expressed in Watts (W), and the equation is P (power) = I (current) x E. (voltage)

The power rating of a resistor is measured in watts and commonly falls between 18W (0.125W) and 1W.Power resistors are typically referred to as resistors with power ratings more than 1W and are utilized specifically for their capacity to dissipate power.

Therefore, 12 power will the resistor use. It is obvious that when current is twice, power is dissipated four times as much.

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The force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

The spring constant is the force needed to stretch or compress a spring, divided by the compressive or expansive distance. It's used to determine stability or instability in the spring, and therefore the system it's intended for. we know,

F = kx

Therefore,

k = F/x

We also know that the force being exerted on the spring is equal to the mass of the object. Hence, F = mg = 5.13 * 9.8 N = 50.174 N and we know compression due to the mass is 0.25m. Therefore,

K = 50.174/0.25 N/m

K = 200.696 N/m

Therefore, The Spring Constant is 200.696 N/m

On release, the spring potential energy gets converted to kinetic energy. Hence, on release, the height attained by the object is given by:

h = \(1/2 kx^{2}\)

We know that k=200.696 N/m and x=0.25 m. Therefore the height is:

h = \(1/2 (200.696 N/m)(0.25 m)^{2}\)

h = 2.5087 m

Therefore, the force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

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i. The gravitational force between the earth and sun can be obtained as follow:

F = GM₁M₂ / r²

F = (6.67×10¯¹¹ × 5.987×10²⁴ × 1.989×10³⁰) / (1.5×10¹¹)²

F = 3.53×10²² N

Thus, the gravitational force between the earth and sun is 3.53×10²² N

ii. The gravitational force between the earth and moon can be obtained as follow:

F = GM₁M₂ / r²

F = (6.67×10¯¹¹ × 5.987×10²⁴ × 7.347×10²²) / (3.844×10⁸)²

F = 1.99×10²⁰ N

Thus, the gravitational force between the earth and moon is 1.99×10²⁰ N

Comparison = G₁ / G₂

G₁ / G₂ = 3.53×10²² / 1.99×10²⁰

G₁ / G₂ = 177

Cross multiply

G₁ = G₂ × 177

Thus, we can say that the gravitational force between the earth and sun is 177 times bigger than the gravitational force between the earth and moon

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The correct order of increasing impedance is:

C. PZT, gel, skin, matching layer

Impedance is a measure of the opposition to the flow of sound waves in a medium. It depends on the density and speed of sound in the material. In the given options, the order of increasing impedance can be determined by considering the properties of the materials involved.

PZT (lead zirconate titanate) has a higher impedance than gel, skin, and the matching layer. PZT is a piezoelectric material commonly used in ultrasound transducers and has a higher density and speed of sound, leading to higher impedance.

Gel has a lower impedance compared to PZT but higher impedance than skin and the matching layer. Gel is used as a coupling medium between the transducer and the skin to enhance acoustic coupling and minimize impedance mismatch.

Skin has a lower impedance than both gel and the matching layer. It is the outermost layer and acts as an interface between the transducer and the biological tissue.

The matching layer has the lowest impedance among the given options. It is designed to match the impedance of the PZT to the impedance of the tissue being imaged, facilitating efficient sound transmission.

Therefore, the correct order is C.

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The rotational speed of the motor 3 in rpm. b. 92

The figure shows a hydraulic circuit that uses three chain conveyors. The torque that drives the motors is T: =1500 N.m. T2 =700 Nm and, T3 = 300Nm.The volumetric flow rate produced by the pump is 6.3 liters per minute. The displacement volume of the motors is V01 =1000 cm3/rev. V02 =1000 cm3/rev and, V09 =500 cm3/rex.

The motors have a volumetric efficiency of 0.9 and an overall efficiency of 0.85. The leakage of hydraulic motors 1 and 3 is internal completely, while the leakage of hydraulic motor 2 is external completely.The orifice of the flow control valve has a diameter of 0.5 mm. The capacity coefficient of the needle valve is 0.7.

The pressure losses through the pipes are ignored. The volumetric flow rate through the needle valve is Q = C × A2 × ΔP / ρ where C is the capacity coefficient, A is the area of the orifice, ΔP is the pressure difference through the needle valve, and ρ is the density of the fluid. The density of the oil used in the hydraulic system is 860 kg/m3. We need to determine the rotational speed of motor 3 in rpm.

So,Let’s first determine the volumetric flow rate required by hydraulic motor 3. Using the expression of volumetric flow rate through the needle valve, we have Q = C × A2 × ΔP / ρ… (i)We are given that the capacity coefficient of the needle valve is 0.7. Its orifice diameter is 0.5 mm.

Hence, the area of the orifice is given byA2 = π d2 / 4where d is the diameter of the orifice. So, A2 = π × (0.5 mm)2 / 4 = 0.196 mm2 = 1.96 × 10-7 m2Using equation (i), we haveQ = C × A2 × ΔP / ρNow, we will calculate ΔP. To do this, we need to determine the flow rates Q1, Q2, and Q3.Let Q’ be the total volumetric flow rate through the system.

Since the overall efficiency of the system is given as 0.85, we haveQ’ = 0.85 × 6.3 l/min = 5.355 l/min = 5.355 × 10-3 m3/minWe know that the volume of fluid passing through the hydraulic motors is equal to their displacement volume multiplied by the number of revolutions per unit time.So, we haveQ1 = V01 × n1 … (ii)Q2 = V02 × n2 … (iii)Q3 = V03 × n3 … (iv)where V01, V02, and V03 are the displacement volumes of hydraulic motors 1, 2, and 3, respectively.

We are given that V01 = V02 = 1000 cm3/rev and V03 = 500 cm3/rev, which gives V01 = V02 = 1 × 10-6 m3/rev and V03 = 0.5 × 10-6 m3/rev.Substituting equations (ii), (iii), and (iv) in equation (i), we haveQ = C × A2 × (Q1 + Q2 - Q3) / ρSolving for Q3, we getQ3 = (Q1 + Q2 - Q) / C × A2 × ρPutting the given values in the above expression, we haveQ1 = V01 × n1 = (1 × 10-6 m3/rev) × n1Q2 = V02 × n2 = (1 × 10-6 m3/rev) × n2Q3 = V03 × n3 = (0.5 × 10-6 m3/rev) × n3Q = 5.355 × 10-3 m3/min = 5.355 × 10-3 / 60 m3/s = 8.925 × 10-5 m3/sA2 = 1.96 × 10-7 m2C = 0.7ρ = 860 kg/m3

Substituting the above values, we get8.925 × 10-5 = (1 × 10-6 × n1 + 1 × 10-6 × n2 - 0.5 × 10-6 × n3) / (0.7 × 1.96 × 10-7 × 860)Solving for n3, we have n3 = 91.6 rpmSo, the correct option is b. 92.

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a) The velocity function v(t) is given by v(t) = -100 + 10t, b) The acceleration function a(t) is given by a(t) = 10, c) The velocity is v(3) = -70 fps, and the acceleration is a(3) = 10 feet per second squared.

a) To find the velocity function, we take the derivative of the distance function s(t) with respect to time t. The derivative of s(t) = 80 - 100t + 5t^2 is v(t) = s'(t) = -100 + 10t. The units of velocity are feet per second.

b) The acceleration function is obtained by taking the derivative of the velocity function v(t). Since v(t) = -100 + 10t, the derivative of v(t) is a(t) = s"(t) = 10. The units of acceleration are feet per second squared.

c) To find the velocity and acceleration when t = 3 seconds, we substitute t = 3 into the respective functions. For velocity, v(3) = -100 + 10(3) = -70 feet per second. For acceleration, a(3) = 10 feet per second squared.

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the branch of optics that studies interference, diffraction, polarization, and other phenomena for which the ray approximation of geometric optics is not valid.

Answer:

Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.

Simpler terms:

The two main forms of solar energy transformation technologies are photovoltaic (electricity) and thermal (heat).

Answer:

yes

Explanation:

as potential energy drops ,kinectic energy rises

The refracting telescope uses large lenses. The larger lenses increase the weight of the telescope. The weight of the refracting telescopes makes it difficult for the observer to keep them aligned.

Thus the correct answer is option b, refracting telescopes.

Answer:

Is Reflecting telescope

Explanation:

I took the test

Answer:

169ml

Explanation:

It is Chemical Energy, actually

Answer: 1. 12 MPH 2. 36m 3. 8 Hz

Explanation:

Answer:

1. 12 MPH 2. 36m 3. 8 Hz

Explanation:

For #1, I multiplied 6 by 2, For #2 I multiplied 6 by 6 and for #3 it's 8 x 2

The D. critical path is a series of events and activities with no slack time.

It is a path that defines the longest duration required to complete a project. It is significant in the project management methodology as it helps the project manager establish a timeline for the project while also identifying the activities that are most critical to the project's completion. If an activity on the critical path takes longer than anticipated, the whole project will be delayed, and if an activity is completed earlier than expected, then it might not be worth it to continue the project, and the client might not be willing to pay for it.

The critical path analysis allows managers to identify and control the critical factors that can impact a project's success, enabling them to focus on the most important areas and make informed decisions about the project. So the correct answer is D. critical path, is a series of events and activities with no slack time.

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The SI unit of charge is the coulomb (C). It is related to the fundamental unit of charge, which is the charge of an electron or proton. The magnitude of the charge of an electron is equal to -1.602 x 10^-19 C, while the magnitude of the charge of a proton is equal to +1.602 x 10^-19 C.

This means that an electron has a negative charge and a proton has a positive charge. The charge of an object is determined by the number of electrons and protons it has. If an object has an equal number of electrons and protons, it is said to be neutral and has a charge of zero.

The charge of an object can be measured using an instrument called an electrometer. Conductors, such as metals, have a high degree of conductivity and can easily transfer charge. In contrast, insulators have a low degree of conductivity and do not easily transfer charge.

The SI unit of conductance is the siemens (S), which is the reciprocal of resistance (ohms). The conductance of a material is determined by its ability to allow the flow of electric current. The concentration of charged particles in a material can affect its conductivity. For example, increasing the concentration of ions in an electrolyte solution can increase its conductivity.