d. Most of the flatworms and roundworms have underdorpel digestive system. Short answer type questions, a. Write any two examples of molluscs. b. Define invertebrate. c. Name the organ used by hydra to swim. d. Which phylum includes soft unsegmented animals? e. What are compound eyes? Name an animal that has osculum​

The beam of light travels in a straight line, with electromagnetic waves oscillating transversely. The speed of light is constant, and the wavelength and frequency of light waves determine its color and other properties.

The beam of light consists of electromagnetic waves traveling in a straight line. These waves oscillate perpendicular to the direction of propagation, creating a transverse wave. Light waves travel at a constant speed in a vacuum, which is approximately 299,792 kilometers per second (or about 186,282 miles per second). This speed is often denoted as "c" and is a fundamental constant in physics.Light waves exhibit characteristics such as wavelength and frequency. Wavelength refers to the distance between successive wave crests or troughs, while frequency is the number of wave cycles passing through a point in one second. The speed of light is related to its wavelength and frequency through the equation c = λν, where c represents the speed, λ is the wavelength, and ν is the frequency.

Different colors of light are characterized by their wavelengths, with shorter wavelengths corresponding to higher frequencies and vice versa. For example, red light has a longer wavelength and lower frequency compared to blue light.

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Question :-

Answer :-

\( \rule {180pt}{2pt} \)

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that the Resistance of the Device is 20 Ohm's. It's Current is given as 15 Ampere . And, we have been asked to calculate the Voltage .

For calculating the Voltage , we will use the Formula :-

\( \bigstar \: \: \: \boxed {\sf { \: Voltage \: = \: Current \: \times \: Resistance \: }} \)

Therefore , by Substituting the given values in the above Formula :-

\( \Longrightarrow \: \: \: \sf { Voltage \: = \: Current \: \times \: Resistance } \)

\( \Longrightarrow \: \: \: \sf { Voltage \: = \: 15 \: \times \: 20 } \)

\( \Longrightarrow \: \: \: \bf { Voltage \: = \: 300 } \)

Hence :-

\( \underline {\rule {180pt}{4pt}} \)

Additional Information :-

\( \Longrightarrow \: \: \: \sf {Voltage \: = \: Current \: \times \: Resistance} \)

\( \Longrightarrow \: \: \: \sf {Current \: = \: \dfrac {Voltage}{Resistance}} \)

\( \Longrightarrow \: \: \: \sf {Resistance \: = \: \dfrac {Voltage}{Current} } \)

Answer:

300 volts

Explanation:

now in this question we have been given our resistance which is 20 ohms and our current which is 15A

using ohm's law

V=IR

where v is voltage, I is current and r is resistance

now substitute,

V=15 x 20

V=300

I hope I helped

Answer:

0.16 Hz

Explanation:

frequency = speed/wavelength

= 20/125 = 0.16 Hz

During phase shift, the substance's molecules' average kinetic energy remains constant.

Simply put, molecules move more quickly as kinetic energy rises. Nevertheless, molecules change phases when potential energy rises. The molecule changes phases as a result of an increase in potential energy.

In a phase change, matter moves from one state to another either by gaining energy through heat and entering a more energetic state, or by losing energy through heat and entering a state with lower energy.

The energy supplied during phase change is only used to separate the molecules; none of it is used to boost the kinetic energy of the molecules. Therefore, since the molecules' kinetic energy is constant, its temperature won't increase.

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Answer: D

Explanation: nuclear fission

The specific APRS ID used by EOSS-280 for a particular flight can only be determined by accessing the flight information on the EOSS website or by contacting EOSS directly.

EOSS-280 is a callsign used by the Edge of Space Sciences (EOSS), a non-profit organization that conducts high-altitude balloon flights for science and educational purposes. The APRS ID used by EOSS-280 depends on the particular flight and may vary from one mission to another.

APRS stands for Automatic Packet Reporting System, and it is a digital communication protocol used by amateur radio operators to transmit data over radio frequencies. APRS is often used in high-altitude balloon flights to track the balloon's position, altitude, and other data in real-time.

During a typical EOSS balloon flight, the APRS ID used by EOSS-280 would be transmitted over the APRS network and would be visible on websites such as aprs.fi or aprsdirect.com, allowing anyone to track the balloon's progress. However, the specific APRS ID used by EOSS-280 for a particular flight can only be determined by accessing the flight information on the EOSS website or by contacting EOSS directly.

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Answer:

Stars that are more than 40 times more massive than our Sun, cannot expand into a red supergiant. This is because they burn too quickly and lose their outer layers fast. They will reach the blue supergiant stage, or perhaps yellow hypergiant, before returning to become hotter stars.

Explanation:

Answer:

Cause there bigger so they have a more hotter surface.

Python based Flask is a microweb framework that is intended to be straightforward, lightweight, and simple to use. It Flask set of capabilities for creating web applications, such as routing, managing

Python-based Flask is a microweb framework. It offers a simple interface for creating web applications, letting programmers utilise the tools they want without being constrained in their inventiveness. Flask is a well-liked option for both small and big projects since it is portable and simple to use. Flask, which is frequently used for prototyping and creating APIs, enables for simple, effective development because to its modular architecture and tiny codebase. In addition, the huge Flask developer community offers a multitude of tools and plugins for customization and added functionality. For developers searching for a lightweight, adaptable framework for their web development needs, Flask is an excellent option.

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Answer:

a. bernoulli's principle

b. archimedes' principle

c. pascal's principle

Explanation:

Answer:

Bernoulli - a

Archimedes - b

Pascal - c

The frequency of a particular spectral line of the sun compare with the frequency of that line observed from a source on earth may differ slightly due to the Doppler Effect, the difference is typically small and can be accurately measured.

When comparing the spectral lines of the sun with those observed from Earth, it's important to consider the Doppler Effect, which causes the wavelengths of light to appear shifted when an object is moving relative to an observer. The frequency of a particular spectral line of the sun will appear slightly different than the frequency of that line observed from a source on Earth due to the Doppler Effect. This effect causes the light from the sun to appear slightly redshifted or blueshifted depending on the relative motion of the sun and Earth.

However, the difference in frequency is typically small and can be accurately measured by modern telescopes. By comparing the frequencies of the spectral lines observed from the sun and Earth, astronomers can study the motion of celestial bodies and determine their chemical compositions. In conclusion, while the frequencies of particular spectral lines of the sun and those observed from a source on Earth may differ slightly due to the Doppler Effect, the difference is typically small and can be accurately measured.

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Answer:

300m/s/s

Explanation:

a=f/m

f=150N

m=.5kg

150/.5=300

The magnitude of the resultant displacement of the caterpillar is 1.4m. Therefore, option B is correct.

The change in the position of an object is called displacement, it is the distance between starting and endpoints. It has both magnitude and direction, it is a vector quantity.

If a caterpillar climbs 1.3 m up a tree, then 0.72 m right, the magnitude of resultant displacement is given by:

H² = P² + B²

H² = (1.3)² + (0.72)²

H² = 1.69 + 0.51

H = \(\sqrt2.2\)

H = 1.4m

Thus, the magnitude of the resultant displacement of the caterpillar is 1.4m. Therefore, option B is correct.

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Answer:

Part 1 = 0.03m, Part 2 = 1.4651J

Answer:

F = - K X

X =  -F / K = M g / K = 9.8 * 2.3 / 735 = .03 m = 3 cm

W = 1/2 K X^2

W = 1/2 * 735 N/m * .065^2 m^2 = 1.55 Joules

Answer:

2892.31 N

Explanation:

Applying,

P = F×v................ Equation 1

Where P = power of the motor, F = Weight of the load the motor can lift, v = velocity

make F the subject of the equation

F = P/v.............. Equation 2

Given: P = 188 W, v = 0.065 m/s

Substitute into eequation 2

F = 188/0.065

F = 2892.31 N

Hence the weight of the load is 2892.31 N

Answer:

the answer is

D.refraction

The value of force exerted on the women will be normal of the lift in positive x direction .

Acceleration is defined as change of velocity divided by time.

Since lift is moving upward at a steady speed , that means no change of speed has been taken place . hence no acceleration.

There is no external acceleration acting on the lift . Hence there will be  two forces, one is the force of gravity and the other is upward normal force from the elevator.

N = mg if the elevator is at rest or moving at constant velocity

The value of force exerted on the women will be normal of the lift in positive x direction

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Answer:

Student science investigatory projects provide students practical experience in using the scientific method and help stimulate their interest in scientific inquiry. Given the benefits society can realise from professional scientific inquiry, such goals in themselves have importance.

When equal masses of copper, lead, and basalt are placed in direct sunlight for the same time interval and they are all at the same initial temperature, they would be expected to change in temperature as follows: Copper would be expected to increase in temperature the most since it has the highest thermal conductivity.

This means that it can conduct heat better and faster than lead and basalt, allowing it to absorb more heat from the sun and increase in temperature more quickly. Lead would be expected to increase in temperature less than copper but more than basalt since it has lower thermal conductivity than copper but higher than basalt. Therefore, the lead would absorb less heat from the sun than copper but more than basalt, resulting in a moderate increase in temperature. Basalt would be expected to increase in temperature the least since it has the lowest thermal conductivity of the three materials. This means that it can conduct heat the poorest and slowest, resulting in less heat absorbed from the sun and less increase in temperature compared to copper and lead.

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Centripetal refers to “center-seeking” Quantifies the change in directionof the velocity The acceleration is directed toward the center of the circle of motion.

The magnitude of the centripetal acceleration is given by V^2/r, the direction is toward the center of the circle. The tangential component of the acceleration is due to changing speed. The centripetal component of the acceleration is due to changing direction.

When an object is rotating at a constant angular velocity, the whole object has a constant angular velocity. Therefore, every mint on the turntable has the same, constant angular velocity.

The acceleration which causes the tangential velocity to change direction is called Centripetal acceleration. Centripetal acceleration is always in toward the center of the circle.

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An object of mass 0. 16kg is moving forwards at a speed of 0. 50m/s. A second object of mass 0. 10kg is at rest. 0.375 m/s is the speed of the first object after the collision.

Just apply momentum conservation since the net external force on the system is zero.

0.16 × 0.50 + 0.10 × 0 = 0.10 × 0.50 + 0.16 ×v

0.080 = 0.050 + 0.16v

0.16v = 0.030

v = 0.375 m/s

The initial velocity is the velocity of the item or system prior to the impact. In contrast, final velocity refers to the velocity of the item after the contact. Use the momentum equation p = m•v to compute the momentum or velocity of an item if given the other values. The answer is no for a single pair of equal mass items.

When two masses collide in a frame with their centers of mass at rest, each ball will leave with the same (or less) speed that it entered with.

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All of the statements listed are correct based on what we have learned about light production in stars.

a) Heat flows from hot to cool regions. This is a fundamental law of thermodynamics that governs heat transfer and is applicable to all objects, including stars.

b) Hotter stars radiate more energy at higher frequencies. This is known as Wien's law, which states that the wavelength of maximum radiation emitted by a blackbody is inversely proportional to its temperature.

c) The temperature of a star can be roughly estimated from its color. This is based on the fact that the peak wavelength of light emitted by a blackbody is related to its temperature, and the color of a star is a reflection of the wavelengths of light it emits.

d) Stars emit light mostly from their surfaces. This is due to the fact that the outer layers of a star are less dense and cooler than the core, which allows light to escape more easily from the surface.

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1)The center of mass of a thin triangular plate bounded by coordinate axes and line x + y = 3, is \(\bar x=\frac{9}{8}, \bar y =\frac{9}{8}\). So, option (c) is right one.

2) The mass of a thin circular plate bounded, x² + y² = 25, is equals to \(\frac{625 π}{2} \). So, option (C) is right one.

The center of mass of a system is considered as a point where the whole mass of the body is concentrated. This point is used to describe the movement of a body.

1) Here, thin triangular plate bounded by the coordinate axes, x= 0, y =0 and x + y = 3, if δ(x,y)= x + y. The set is by the inequalities: D≡{0⩽y⩽3−x, 0⩽x⩽3 }

The value of the mass is the integral of the density function, so, Mass =

\(∬_D δ(x,y)dxdy = ∬_D(x+y)dxdy \\ \)

\(= \int_{0}^{3}∫_{0}^{3−x} (x+y)dydx \)

For the first component of the center of mass, \( \bar x = \frac{ \int \int_{D} xδ(x,y)dxdy}{ \int \int_{D} dxdy} \\ \)

\(=∫_{0}^{3} \int_{0}^{3−x} x(x+y)dydx \)

\(=∫_{0}^{3} \int_{0}^{3−x}(x² + xy)dydx\)

\(=∫_{0}^{3} [ x²y + \frac{xy^2}{2}]_{0}^{3−x}dx \)

\(=∫_{0}^{3} [ x²(3 - x) + x \frac{(3-x)²}{2}] dx \)

\(=∫_{0}^{3} [ 3x² - x³ + \frac{9x}{2} + \frac{x³}{2} - \frac{6x²}{2}] dx \\ \)

\(= [ x³ - \frac{x⁴}{4} + \frac{9x²}{4} + \frac{x⁴}{8} - \frac{6x³}{6}]_{0}^{3}\)

\(= [ 3³ - \frac{3⁴}{4} + \frac{3⁴}{4} + \frac{3⁴}{8} - {3}^{ 3} ]\)

\(= \frac{81}{8}\)

\(\bar x = \frac{ \frac{ 81}{8}}{\frac{9}{2}}\) \(= \frac{9}{8}\)

Similarly, second component is \( \bar y = ∬_D δ(x,y)dydx = ∬_D y(x+y)dydx \\ \). Substitute all known values in above integral, we results \(\bar y=\frac{9}{8}\).

2) The mass of a thin circular plate bounded by x² + y² = 25 if δ(x,y) = x² + y².

Mass \(= \int_x \int_y (x² + y²)dxdy \\ \)

let \(x = rcos(\theta), y = r sin(\theta)\) then x² + y² = r² = 25

\(= \int_r ∫_{\theta} rf(r,\theta) drd{\theta} \)

\(= ∫_{\theta} \int_r r ( r²)dr d{\theta} \)

\(=∫_{0}^{2π} \int_{0}^{5} r³dr d{\theta} \)

\(= ∫_{0}^{2π} \frac{r⁴}{4}]_{0}^{5}d{\theta} \)

\(= ∫_{0}^{2π} \frac{5⁴}{4}]d{\theta} \)

\(= [ \frac{5⁴ \theta }{4}]_{0}^{2\pi} \)

= \(\frac{625 π}{2} \). Hence, required value is \(\frac{625 π}{2} \).

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Complete question:

find the center of mass of a thin triangular plate bounded by the coordinate axes and the line x+y=3 if δ(x,y)=x+y.

a) \( \bar x = 2, \bar y = 2\)

b) \( \bar x = \frac{5}{4}, \bar y = \frac{5}{4}\)

c) \( \bar x = \frac{9}{8}, \bar y = \frac{9}{8}\).

d) \( \bar x = 1, \bar y = 1\)

2) Find the mass of a thin circular plate bounded by x²+ y² =25 if δ(x,y)= x²+y².

A)5π/2

B) 25π/2

C)625π/2

D)125π/2

The Maximum safest speed to travel at when navigating a curve is 71% of the normal speed.

In comparison to friction on a dry road, the friction coefficient of tyres sliding at 60 km/h on roads will rise during times of heavy rain and reduce on a wet road after a period of rainfall.

Water can change the amount of friction between two surfaces. Rubber tyres and paved roads have less friction when there is water present. Drivers must therefore take extra precautions to avoid sliding on slick roads. Water can make contact between your fingers and a plastic sheet more abrasive.

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The work done by the student in moving the desk of mass 80 kg is 1,216J

The mass of the desk = 80 kg

The distance of the desk moved by the student = 4 meter

The coefficient of kinetic friction = 0.4

The work done by the student can be found using the formula,

                 W = F x d

where W is the work done by the student

           F is the frictional force

           d is the distance moved

Let us find the frictional force first

                     F = μmg cosθ

where μ is the coefficient of friction

           m is the mass of the object

                     F = 0.4 x 80 x 9.8 x cos 0

                        = 304 N

Then, the work done is

                      W = 304 x 4

                          = 1,216 J

Therefore, the work done is 1,216 J

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Answer:

8.45m/s = recoil speed

Explanation:

Momentum = mass • velocity

9.8kg • 88.03m/s = 102.1kg • recoil speed

862.694kg•m/s = 102.1kg • recoil speed

divide both sides by 102.1kg

8.45m/s = recoil speed

Answer:

11 = 11

Explanation:

Answer:

True

Explanation:

3+2x4=3+(2x4), they both equal 11

Answer:

PLS PLS PLS mark brainliest

Explanation:

The following are the environmental problems caused by the invasive algae which is known as Lyngbya.

A. It blocks the sunlight from reaching the water, thereby depriving the plants in the water from accessing it. So they won't be able to manufacture their foods and eventually die off.

B. The algae produce offensive odour like rotten egg , which drive people and other organisms away.

C. The algae prevent oxygen from entering the water, and prevent the resident organisms from making use of it, which leads to their death.

D. The algae also give off heat into the chilly spring waters.

In conclusion, the goals of the Crystal River project is to save the living organisms in the river from extinction and to make it a livable environment for them.

A. 95 Cal is equivalent to 397480 J

B. The final speed of the object is 625.78 m/s

C. The final temperature of the water is 46.8 °C

A. Converting 95 Cal to Joules

1 Cal = 4184 J

Therefore,

95 Cal = 95 × 4184

Thus, 95 Cal is equivalent to 397480 J

B. Determination of the speed of the object

Kinetic energy (KE) = 397480 J

Mass (m) = 2.03 Kg

KE = ½mv²

397480 = ½ × 2.03 × v²

397480 = 1.015 × v²

Divide both side by 1.015

v² = 397480 / 1.015

Take the square root of both side

v = √(397480 / 1.015)

Therefore, the speed of the object is 625.78 m/s

C. Determination of the final temperature of the water

Mass of water (M) = 3.79 kg

Initial temperature of water (T₁) = 21.7 °C

Specific heat capacity of water (C) = 4186 J/KgºC

Heat (Q) = 397480 J

Q = MC(T₂ – T₁)

397480 = 3.79 × 4186 (T₂ – 21.7)

397480 = 15864.94 (T₂ – 21.7)

Clear the bracket

397480 = 15864.94T₂ – 344269.198

Collect like terms

397480 + 344269.198 = 15864.94T₂

741749.198 = 15864.94T₂

Divide both side by 15864.94

T₂ = 741749.198 / 15864.94

Therefore, the final temperature of the water is 46.8 °C

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