Which best explains why the pencil seems bent?

a. light travels slower in air than glass

b. light travels faster in air than in water.

c. light travels at the same speed in all matter

d. Light travels at different speeds in water and in glass.

50 mph

100 divided by 2

They both transfer energy through a medium in form of waves.

Transverse waves have perpendicular disturbances relative to the wave's direction, while longitudinal waves have parallel disturbances. Examples include strings of musical instruments and light for transverse, and sound for longitudinal waves. Amplitude is independent of wave speed in both types.

Transverse and longitudinal waves both involve the transmission of energy through a medium by means of periodic disturbances. A transverse wave is characterized by the disturbance being perpendicular to the direction of wave propagation. This means that if the wave moves horizontally, the disturbance moves vertically. Examples of transverse waves include waves on strings of musical instruments and electromagnetic waves like visible light.

In contrast, a longitudinal wave, also known as a compressional wave or compression wave, has disturbances that move parallel to the direction of the wave propagation. Sound waves in air and fluids exemplify longitudinal waves, where the periodic disturbances are variations in pressure.

The amplitude of a wave, which is the size of the disturbance, does not affect the wave's speed of propagation. Whether a wave is transverse or longitudinal, its amplitude is completely independent of its speed (Vw or Uw). Additionally, there are waves that combine both transverse and longitudinal characteristics, such as seismic waves resulting from earthquakes.

Formulate conclusions.  

You could easily help yourSELF if you simply follow the instructions in the question and "Use Ohm's law" to calculate the resistance.

Ohm's Law:  Resistance = (voltage) / (current)

Resistance = (10 v) / (5 A)

Resistance = 2 ohms

ribosomes

an animal cell with a nucleus

animal

Answer:

4) Chloroplasts, 5) An animal cell with a nucleus, 6) many-celled organisms.

Explanation:

4) Chloroplasts are organelles present in eukariotic cells that produce food with the help of sunlight via photosynthesis.

5) Every cell has a nucleus. Bacteriae are prokariotic cells, while vegetal and animal cells are eukariotic cells, in which cytoplasm is exclusive for organells. Hence, the right answer is: An animal cell with a nucleus.

6) Specialized cells are cells that help in functioning of many-celled organisms. Therefore, the right choice is: many-celled organisms.

A device consisting of a wheel over which rope or chain is pulled in order to lift a heavy object.

Examples- Elevators use multiple pulleys in order to function. A cargo lift system that allows for items to be hoisted to higher floors is a pulley system

Answer:

The charge that will pass through the wire will be approx. 0.003C.

Explanation:

Two equations are relevant to answer this question:

(1) The charge (Q) over a capacitance (C), given a voltage (U):

[tex]Q = C\cdot U[/tex]

and

(2) the capacitance of a parallel-plate capacitor:

[tex]C=\varepsilon \frac{A}{d}[/tex]

with [tex]\varepsilon[/tex] being the dielectric constant, A the plate area and d their distance.

We are given the capacitance when air is present (80 micro-Farad, or uF). The dielectric constant for air/vacuum is 8.84 pico-Farad per meter. Then someone sneaky slides a slab of dielectric medium with dielectric constant of 20 pF/m and connects a source of 30V. By inserting the slab, they increased the capacitance by a factor of 20/8.84=2.26, making it 2.26*80=181uF. By connecting it to the source 30V, they charged our capacitor to a charge

[tex]Q = C\cdot V = 181\cdot 10^{-6}F\cdot 30V=5.43\cdot 10^{-3}C[/tex]

but, the sneaky person changes his mind and removes the slab, effectively changing C down to the original 80uF. There is now excess charge on the capacitor that wants to leave! The steady-state charge on the air-filled capacitor should be:

[tex]Q_0 = C_0\cdot V = 80\cdot 10^{-6}F\cdot 30V=2.4\cdot 10^{-3}C[/tex]

The charge that will pass through the wire will be the difference:

[tex]Q-Q_0=(5.43-2.40)\cdot 10^{-3}C\approx 3\cdot 10^{-3}C[/tex]

D: use of linear perspective

The renaissance technique  used in this painting to make it more realistic and three-dimensional was use of linear perspective. Hence, option D is correct.

Creating the appearance of depth on a flat surface through the use of linear perspective. In a painting or drawing that employs this approach, all orthogonal parallel lines meet at a single vanishing point on the horizon.

It is believed that Italian Renaissance builder Filippo Brunelleschi developed linear perspective in 1415, and writer and architect Leon Battista Alberti later recorded it around 1435. They used the concept to create 3D paintings.

Although painters and architects in the ancient Greek and Roman eras were probably aware of linear perspective, there are no records from those times, and the technique was thus forgotten until the 15th century. Hence, option D is correct.

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The options of your question includes:

use of negative space

B.

use of colorful paint colors

C.

use of gesture drawing

D.

use of linear perspective

The temperature in which water is frozen.

The freezing point is the temperature at which a liquid becomes a solid, and 'freezing' is the term for this phase transition. 'Freezing point depression' is the lowering of this temperature due to the presence of a solute. Freeze drying is a related process that involves lowering atmospheric pressure to dry and cool substances.

The freezing point is scientifically defined as the temperature at which a liquid turns into a solid. During this process, known as freezing, the physical state of the matter changes due to a decrease in temperature. An important concept related to this is freezing point depression, which refers to the lowering of a liquid's freezing point by the addition of a solute.

Substances can also undergo a process called freeze drying. This method involves drying substances such as food by reducing the atmospheric pressure around them, which speeds up the drying process and decreases the temperature of the substance being freeze-dried due to the change in pressure.

NaOH is the chemical formula which represents the lye correctly.

Answer: Option D

Explanation:

Lye is termed for molecules made up of metal hydroxide family. As the compound is a metal hydroxide, it should be a base and an alkali according to the properties of metal and OH group. Mostly lye is obtained by leaching ashes or derived from strong alkali metal hydroxides.

So among the given choices, NaOH is the correct option as it is the chemical formula for sodium hydroxide. It is well known that sodium hydroxide is one of the efficient base metal in the alkali group and they can be also termed as caustic soda. Thus NaOH is the chemical formula which represents the lye correctly.

Field strength = (1000 v) / (40 cm)

Field strength = (1,000 v) / (0.4 meter)

Field strength = (1,000 / 0.4) (volts/meter)

Field strength = 2,500 volts per meter

The electric field strength between two parallel charged plates, separated by 40 cm is 2500 V/m

The question given above, the following data were obtaines:

The electric field strength can be obtained as shown below:

Electric field strength (E) = Potential difference (V) / Distance apart (d)

= 1000 / 0.40

= 2500 V/m

Thus, the electric field strength between the two plates is 2500 V/m

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In physics, acceleration is defined as the rate of change of the velocity of an object with respect to time. That is A = VF - VI /T;

Where A =  Acceleration

VF = Final velocity = 20 km

VI = Initial velocity = 80 km

T= Time = 0.5 hr

A = (20 - 80)/ 0.5 = - 60/.5

A = - 120 Km/ hr^2

Therefore, the acceleration of the car is -120 km/hr^2.

Because the value is negative, the appropriate name that describe it is deceleration.

Answer : Deposition takes place when the molecules settle out of a solution.

Explanation :

Deposition : It is a type of process in which the phase changes from gaseous state to solid state without passing through the liquid state at constant temperature.

Or we can say that in deposition process, the molecules are settle down at the bottom of the container. In this process, there is no intermolecular space present between the atoms of molecule.

Plasma is known as the 4th state of matter and is itself ionized gas. In this sense, ionization consists of the production of ions, which are electrically charged atoms or molecules due to the excess or lack of electrons with respect to a neutral atom or molecule.

That is why in this process there are always free electrons. Therefore in heating gas to create plasma can yield  free electrons, and the correct option is D.

Answer:

D) free electrons.      

Explanation:

Plasma is the fourth state of matter where in matter exists in ionized form. When a gas is heated such that electrons separate from the atom and positive ion is formed along free electrons, a plasma is said to be created. Example: Sun is a ball of plasma. Thus, heating a a gas to create plasma can yield free electrons. Option D is correct.

Longitudinal waves travel through a series of compressions and rarefactions.

Longitudinal waves travel through a series of compressions and rarefactions, with sound waves in air and water as common examples. The motion of disturbance is in the same directoin as the wave propagates. The speed of these waves depends on the physical properties of the medium they are travelling through.

Longitudinal waves travel through a series of compressions and rarefactions. This is unlike transverse waves which have their disturbances occurring perpendicular to the direction of wave propagation. In a longitudinal wave, the disturbance or vibration is in the same direction as the wave travel. Examples of this type of wave include sound waves in air and water, seismic P-waves, and any waves where periodic variations in pressure are transmitted in fluids. The speed of these waves can depend on aspects such as the density and bulk modulus of the medium they're travelling through.

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When the distance between the source and the observer is DEcreasing, the observer sees light that has a shorter wavelength than the light actually had when it left the source.

It doesn't matter how the distance between them is decreasing.  The source could be moving toward the observer, the observer could be moving toward the source, or they could both be moving in a way that makes the separation between them decrease as time goes on.  The result is the same.

(When this is used in Astronomy and Astrophysics, the big trick is:  How does the observer know what the wavelength actually WAS when the light left the source ?)

Hang time = 3.0 s

Range  = 65.06 m

Maximum Height = 11.05 m

Hang time is given by the formula;

T = 2vₒsinθ/g

Thus;

T = 2*(26.2 )sin34.2 / 9.81

    = 3.0 s  

Range is given by the formula;

R = vₒ²sin2θ/g

      = 26.2²sin(2*34.2) /9.81

      = 65.06 m  

Max height is given by the formula;

H = vₒ²sin²θ/2g

Thus;

H= 26.2²sin²34.2 /(2*9.81)

  = 11.05 m

Fuses and Circuit Breakers (CB) are used for the protection of power system. These along with other protective equipment like relays, isolater, switches, are collectively called as switchgear(switching equipment used in power systems).

The basic function is to break the circuit in case of faulty conditions so as to protect the power system equipment and auxiliaries.

FUSE is a low resistance device which is placed in the circuit for protection. Under faulty conditions when the current becomes more than the desired value, then due to the increase in temperature the fuse wire melts and breaks, thus breaking the circuit. These are used for lower power ratings and can be used only once, after that it has to be replaced with a new one.

CIRCUIT BREAKER also solves the same purpose i.e. it breaks the circuit when the fault occurs. These are used for large ratings and in the power systems and auxiliaries. CB also has the capability to re-close after the fault is through i.e. when the system gets healthy. The CB has two parts/contacts one is static and the other is moving(the one responsible for making or breaking the contacts).When the contacts of CB separate, then it said to have tripped. Tripping of the circuit breaker has to be very fast so as to avoid the arc formation between the two contacts, otherwise it will defeat the purpose of installing the CB. The trip signal is given to the CB by an other protective device called as an ELECTRICAL RELAY. CB’s are categorized on the basis of the power ratings and the medium used to extinguish the arc formed during the breaking of the contacts.

mark brainliest  :)

Electric fuse and a Circuit breaker both contain ways to interrupt the flow of electricity.

Hope this helps!

Davinia.

Answer: 1) Ectothermic animals need the warmth before they can move around to hunt food.

2) frogs, lizards, snakes

3) rattle snake

4) mammals; warm-blooded

5) Ectothermic animals have a lower body temperature than endothermic animals.

6) move around faster to raise its body temperature.

7) keep their bodies from having too much water.

8) constantly move around to keep their bodies warm.

9) ectotherm

10) Homeothermy is the ability of an organism to maintain a constant internal body temperature, regardless of the temperature of the environment. This may require the ability to lose excess heat as well as the ability to generate and conserve heat. Most mammals have both abilities.

Explanation: I never ask, but can you pls give me brainlest?

The correct answer is option D) Ectothermic animals need warmth before they can move around to hunt food. The correct answer is option C) frogs, lizards, and snakes. The correct answer is option C) rattlesnake. The correct answer is option C) mammals; cold-blooded. The correct answer is option D) Ectothermic animals have a body temperature that is the same as their environment, and endothermic animals have a constant body temperature. The correct answer is option A) slow down as a response to the cooling temperature. The correct answer is option D) generates heat loss through evaporation. The correct answer is option A) eat more often to have energy to keep a constant temperature. The correct answer is option B) endotherm. The correct answer is option B) endothermic.

The student asked why lizards bask in the sun, which group of animals could be correctly classified as ectothermic, and multiple other questions regarding endothermic and ectothermic animals. Here are the detailed answers:

1. Ectothermic species, such as lizards, need warmth to move and digest. They rely on external sources of heat, such as sun exposure, to control their body temperature, which is essential for their physiological activities.

2. Ectothermic creatures, such as frogs, lizards, and snakes, rely on external heat sources to control their body temperature, whereas endothermic animals, such as robins, squirrels, mice, bears, and wolves, do so internally.

3. Rattlesnake matches Group B reptile requirements, such as hard shells and terrestrial existence, and can be classed as terrestrial or aquatic depending on standard biological classification.

4. Birds and mammals are warm-blooded, meaning they have a constant internal body temperature that does not alter with the environment, known as endothermy, which allows them to remain active in a variety of environments.

5. Ectothermic and endothermic animals have different body temperatures. Ectothermic animals maintain a steady body temperature by relying on external heat sources, whereas endothermic species regulate their internal temperature, resulting in a constant body temperature.

6. As the temperature drops, a cold-blooded animal is likely to slow down in reaction to the decreasing temperature. Cold-blooded species, or ectotherms, rely on external heat sources to control their body temperature, therefore metabolic activities slow down in colder temperatures.

7. Sweating is one way that warm-blooded animals generate heat loss through evaporation. Warm-blooded animals lose heat by evaporation, which allows moisture on their skin to evaporate, lowering and regulating the body temperature, especially in warm surroundings or during physical effort.

8. Because endothermic animals must maintain a constant body temperature, they must eat more often to have energy to keep a constant temperature. Endotherms need a high metabolic rate to maintain their internal heat generation. Regular feeding supplies the energy required to maintain a consistent body temperature, particularly in cooler regions.

9. The characteristics of Group A describe endotherms. Endotherms are organisms that can maintain a steady internal body temperature regardless of their external environment. They regulate their temperature, allowing them to flourish in a wide range of environmental conditions, as opposed to ectotherms, which rely on external heat sources.

10. The ability of some animals to modulate their body temperatures through internal techniques such as muscle shaking, fat burning, and panting is called endothermic. Endothermic species regulate their body temperature internally via metabolic processes, allowing them to maintain a steady temperature despite environmental disturbances.

The acceleration of the 20-kg rock is, also, a. Hope this helps.

The acceleration of the 20-kg rock will be the same as the 10-kg rock in an ideal condition. This is due to Galileo's principle of equivalence which states that the gravity does not depend on the mass of the falling object.

In Physics, the rule referred to as Galileo's principle of equivalence states that in the vicinity of Earth the acceleration of a falling object is independent of its mass. This means that all objects fall at the same rate given that they are in a vacuum where no factors like air resistance are present.

So, if a 10-kg rock falls with an acceleration a, then the 20-kg rock, when dropped from the same height, will also fall with the same_ acceleration__. The gravity does not depend on the mass of the falling object. So if by 'a' we mean the acceleration due to gravity, then both rocks fall with the same acceleration 'a' irrespective of their weights. The only difference in real-world scenarios is due to elements such as air resistance.

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Answer:

It means that when water has the thermal capacity equal to iron, that thermal capacity is greater than that of copper.

Explanation:

The water equivalence of a body is the body of water that has the same thermal capacity as the body, that is, it is the body of water that, receiving the same amount of heat, undergoes the same temperature variation as the body. Thus, we can say that water equivalent to iron is greater than copper means that when water has the same thermal capacity as iron, that thermal capacity is greater than that of copper.

Answer:

B. 45 km/hr south

Explanation:

Velocity is a vector quantity which consists of:

- A magnitude, given by the ratio between displacement and time taken for the motion

- A direction, which corresponds to the direction of the displacement

Let's analyze now each option:

A. 12 m/s --> this is not a velocity: this is a speed, because it does not specify the direction, so it is only a scalar quantity

45 km/hr south --> this is a velocity, because it specificies both magnitude (45 km/h) and direction (south)

C. 55 km/hr  --> again ,this is not a velocity, but it is a speed, because it does not specify the direction, so it is only a scalar quantity

D. -5 m/s2 east --> this is not a velocity, but it is an acceleration, since the units of measurement are the ones of acceleration (m/s^2, while for the velocity should be m/s or km/h)

Final answer:

Velocity is a vector quantity that combines speed and direction, with option B. 45 km/hr south representing an example of velocity.

Explanation:

Velocity is a vector quantity that includes both speed and direction. In the given options, choice B. 45 km/hr south is an example of velocity because it includes both a numerical value (magnitude) and a specified direction. The question posed concerns determining which of the given options is an example of velocity. Velocity is defined as a vector quantity that describes both the speed of an object and the direction in which it is moving. Therefore, among the provided options, the one that includes both a magnitude and a specific direction should be considered an example of velocity.

The answer to this is A, Magnetic Field.

Final answer:

The correct answer is A.) Magnetic Field. An electric current creates a magnetic field, and this phenomenon is fundamental to electromagnetism. The magnetic field around a current-carrying wire can be visualized using the right-hand rule.

Explanation:

As an electric current forms an electric field, a magnetic field is created in the phenomenon of electromagnetism. Moving electric charges form an electric current and this current is the source of all magnetic fields, whether macroscopic and flowing through a wire, or microscopic and flowing in orbit around an atomic nucleus.

The creation of a magnetic field can be observed around wires carrying electrical currents, as currents are streams of charged particles moving. The magnetic field at a point in space due to an electric current flowing through a long, straight wire can be determined by the right-hand rule, which helps visualize the relationship between current and magnetic field direction around the wire.

Therefore, the correct answer is A.) Magnetic Field.

The answer is C.Magnetic Field.

Answer:

uthe th

Explanation:

Answer:

12,558 J

Explanation:

The amount of heat absorbed by the water is given by:

[tex]Q=mC_S \Delta T[/tex]

where

m = 50 g is the mass of the water

[tex]C_s = 4.186 J/gC[/tex] is the water specific heat

[tex]\Delta T=90C-30C=60^{\circ}C[/tex] is the temperature increase of the water

Substituting into the formula, we find

[tex]Q=(50.0 g)(4.186 J/gC)(60^{\circ}C)=12,558 J[/tex]

To find the amount of heat absorbed by the water, we use the formula for heat calculation q = m × c × ΔT. With a known heat capacity of water mass and temperature change we find the heat absorbed is 12552 J.

To calculate the quantity of heat absorbed by the water, we use the formula for heat (q) which is q = m × c × ΔT . In this equation, 'm' stands for mass, 'c' represents the specific heat capacity, and 'ΔT' is the change in temperature.

 The specific heat capacity (c) of water is 4.184 J/g °C, the change in temperature (ΔT) is 90°C - 30°C = 60°C, and the mass (m) of water is 50g. Substituting these values into our formula:

 q = 50g × 4.184 J/g °C × 60°C

q = 12552 J

This value represents the heat absorbed by the water.

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the temperature and how far it is.

if it has the lowest surface temperature, it is red.

if it has high surface temperature, it is blue.

if you look a the earth science esrt, there is a graph stating the stars in our galaxy, the milky way, and how it far, hot/cold, and howold it is.

plz give me a brainliestt

The temperature of a star affects its color. Hotter stars appear bluish-white, while cooler stars appear reddish. This color variation is due to the relationship between a star's temperature and its emitted light spectrum.

A star's colour depends on its surface temperature. Stars emit a continuous spectrum of light, but temperature varies the intensity distribution across wavelengths. Wien's displacement law indicates that hotter things radiate more energy at shorter wavelengths. Redder stars are cooler, while bluish stars are hotter. Red, orange, yellow, white, and blue are the coldest to hottest star colours.

A star's chemical makeup can also affect its colour. A star's atmosphere absorbs specific wavelengths of light, creating spectral lines that may change its colour. Astronomers can determine a star's temperature, composition, and other properties by analysing its colour and spectrum.

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