When does total internal reflection occur?

A. when the angle of incidence exceeds the angle of reflection

B. when the angle of incidence is less than the angle of reflection

C. when the angle of incidence is less than the critical angle

D. when the angle of incidence exceeds the critical angle

PLEASE GIVE A STRAIT ANSWER PLEASE

Answer:

the object of mass 20kg

Explanation:

because the force=massxacceleration

and there is a direct relation between force and mass so the more the mass of the object the greater force it will need to accelerate for example if you tried to push a bike it will be easier than trying to push a truck because of the difference between their masses as the objects of less masses require less forces to move

Answer:

[tex]2.5\cdot 10^{-5}N[/tex]

Explanation:

The force per unit length between two current-carrying wires is given by:

[tex]\frac{F}{L}=\frac{\mu_0 I_1 I_2}{2\pi r}[/tex]

where

[tex]\mu_0[/tex] is the vacuum permeability

[tex]I_1, I_2[/tex] are the two currents

r is the separation between the wires

In this problem, we have

[tex]I_1 =3.55 A[/tex] is the current in the first wire

[tex]I_2 = 2.75 A[/tex] is the current in the second wire

[tex]r=78 mm=0.078 m[/tex] is the separation between the wires

Substituting into the equation, we find

[tex]\frac{F}{L}=\frac{(4\pi \cdot 10^{-7} H/m)(3.55 A)(2.75 A)}{2\pi (0.078 m)}=2.5\cdot 10^{-5}N[/tex]

Answer:

A falling object will continue to accelerate to higher speeds until they encounter an amount of air resistance that is equal to their weight.

Explanation:

Answer:

so its basically termonal velocity

Explanation:

Answer: C

Explanation:

Calculate EkA -kinetic energy of car A

m=1000kg

Va=16.66 m/s

EkA=m*Va²/2

Eka=(1000kg*277.556m²/s²)/2

Eka=138 777.8 J

Calculate kinetic energy of CarB:

m=2000 kg

Vb=8.33 m/s

Ekb=(m*Vb²)/2

Ekb=(2000kg*69.39m²/s²)/2

Ekb=69 388.9 J

compare Eka with EkB

Eka/Ekb=138 777.8 J/69 388.9

Eka/Ekb=2

The kinetic energy of car A is twice as much as that of car B. This is calculated using the formula for kinetic energy, which is 1/2 * mass * (velocity)^2.

To compare the kinetic energy of car A with that of car B, we first need to understand the mathematical formula for kinetic energy, which is 1/2 * mass * (velocity)^2.

Let's calculate for each car:

Therefore, car A has twice as much kinetic energy as car B.

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Answer:

14108 J

Explanation:

The heat that has to be removed from the water is given by

[tex]Q=m C_s \Delta T[/tex]

where

m = 225 g is the water mass

[tex]C_s = 4.18 J/gC[/tex] is the specific heat capacity of the water

[tex]\Delta T=10.0 C-25.0 C=-15.0 C[/tex] is the charge in temperature of the water

Substituting into the equation, we find

[tex]Q=(225 g) (4.18 J/gC) (-15.0 C)=-14,108 J[/tex]

and the negative sign means the heat is removed from the system.

Answer:

3.2 × 10⁻⁸ N.

Explanation:

By Coulomb's Law, the magnitude of the electromagnetic force between two point charges is inversely proportional to the square of their separation, [tex]r[/tex]. In other words,

[tex]\displaystyle \frac{F_1}{F_2} = {\left(\frac{r_2}{r_1}\right)}^{2}[/tex].

Final electromagnetic force:

[tex]\displaystyle F_2 = F_1 \cdot \left(\frac{r_2}{r_1}\right)^{2} = 8\times 10^{-9}\times \left( \frac{20}{10}\right)^{2} = 3.2\times 10^{-8}\;\text{N}[/tex].

Answer: Option (d) is the correct answer.

Explanation:

Dalton's model of atom states that every matter is made up of atoms and these atoms are indivisible in nature.

On the other hand, Thomson's model of atom states that there are small particles present in an atom that has positive or negative charges.

Thomson's model of atom is also known as plum pudding model where negatively charged particles are represented by plum and positively charged particles are represented by pudding.

Thus, we can conclude that Thomson’s model of the atom include smaller particles that Dalton’s model did not have.

Answer:

smaller particles....(D)

Explanation:

hope this helps

Answer:

6.922 × 10¹⁰ J.

Explanation:

The satellite is much smaller than the earth and can be treated as a point mass.

Consider the equation for the gravitational potential energy of a point mass at a certain distance away from the center of a spherical mass:

[tex]\displaystyle \text{GPE} = -\frac{G \cdot M \cdot m}{r}[/tex],

where

As a side note, the GPE here is the same as the work that an external force will do when it brings the point mass from infinitely far away to the current point in space. Gravity pulls the object inwards; the external force acts against gravity in the opposite direction of travel. Energy will be released. The work of the external force will be negative. Hence, the value of GPE shall be either zero (at infinitely far away) or negative.

Convert all values to SI units:

Initial GPE of the satellite:

[tex]\displaystyle \begin{aligned}\text{GPE(Initial)} &= -\frac{G \cdot M \cdot m}{r_{\text{Initial}}}\\ &=-\frac{(6.67\times 10^{-11})\times (5.972\times 10^{24})\times (2.000\times 10^{3})}{6.400\times 10^{6}} \\ &= -1.245\times 10^{11}\;\text{J}\end{aligned}[/tex].

Final GPE of the satellite:

[tex]\displaystyle \begin{aligned}\text{GPE(Final)} &= -\frac{G \cdot M \cdot m}{r_{\text{Final}}}\\ &=-\frac{(6.67\times 10^{-11})\times (5.972\times 10^{24})\times (2.000\times 10^{3})}{7.200\times 10^{6}} \\ &= -1.106\times 10^{11}\;\text{J}\end{aligned}[/tex].

Gravity is the only force that act on the satellite. The velocity [tex]v[/tex] of the satellite in this orbit depends on the size of the net force on the satellite, which is the same as gravity on the satellite. In other words,

[tex]\displaystyle \frac{m\cdot v^{2}}{r} = \Sigma F = W = \frac{G\cdot M\cdot m}{r^{2}}[/tex],

where again, [tex]r = 6400 + 800 = 7200\;\text{km} = 7.200\times 10^{6}\;\text{m}[/tex].

Rearranging gives:

[tex]\displaystyle v^{2} = \frac{G\cdot M}{r}[/tex],

[tex]\displaystyle \begin{aligned} v &= \sqrt{\frac{G\cdot M}{r}} \\ &= \sqrt{\frac{(6.67\times 10^{-11})\times (5.972\times 10^{24})}{7.200 \times 10^{6}}} \\ &= 7.438\times 10^{3}\;\text{m}\cdot \text{s}^{-1}\end{aligned}[/tex].

As a result,

[tex]\displaystyle \text{KE} = \frac{1}{2}\; m \cdot v^{2} = \frac{1}{2} \times (2.000\times 10^{3}) \times (7.438\times 10^{3}) = 5.532\times 10^{10} \;\text{J}[/tex].

Assume no energy loss while lifting the satellite into the space. The energy required will be the same as the change in GPE plus the change in KE (Final minus Initial, keep any negative sign.)

[tex]\begin{aligned} \text{Energy Required} &= (\text{Final GPE} - \text{Initial GPE}) + (\text{Final KE} - \text{Initial KE})\\ &=((-1.106\times 10^{11}) - (-1.245\times 10^{11})) + ((5.532\times 10^{10} \;\text{J})) \\&=6.922 \times 10^{10}\;\text{J}\end{aligned}[/tex].

Hello There!

It's a Property of matter where atoms in an object are aligned into domains

Hydrogen is a nonmetal.

At normal room temperature, hydrogen is a gas.

Hope this helps have a noice day

MAY GOD BLESS YOU!!!

Answer:

[tex]\large \boxed{\mathrm{gas}}[/tex]

Explanation:

Hydrogen is a gas at room temperature. Hydrogen has a molecular formula of [tex]\sf H_2[/tex].

Answer:

The energy becomes 4 times greater.

Explanation:

We know that the energy of a wave is proportional to the square of its amplitude

E ∝ Amplitude^2

Since the original amplitude = 0.5 m

and the new amplitude becomes = 1 m

We are doubling the amplitude. This means that the new energy will be affected by a factor of 4

E_new  ∝ (2*Amplitude)^2  =

E_new ∝ 4*(Amplitude)^2  

E_new  = 4*E

1) Mass is a measure of how much stuff there is. Weight is a measure of the gravitational force on mass

2) It means "a change in..."

Hope this helps :)

Answer:

All the light rays are reflected into the same direction

Explanation:

Reflection occurs when a light ray hits a surface and bounces back at a certain angle.

The law of reflection states that:

- The angle of incidence, the angle of reflection and the normal to the surface all lie in the same plane

- The angle of reflection is equal to the angle of incidence

(where the angle of incidence is the angle between the incident ray and the normal to the surface, while the angle of reflection is the angle between the reflected ray and the normal to the surface)

We have two cases:

- if the surface is completely smooth (such as the Mirror lake), then all the light rays coming from same direction have same angle of incidence, so they are reflected into the same direction, allowing to see a clear image of the object above --> in this case we talk about specular reflection

- if the surface is not 100% smooth, then the light rays coming from same direction do not hit the surface at same angle of incidence, therefore they are reflected into different directions, and it is not possible to observe a clear image of the object above --> in this case we talk about diffuse reflection

Answer:

going to work my way down

Troposphere

contains weather

contains life forms

stratosphere

contains ozone layer

mesosphere

where asteroids burn up

very low temps

thermosphere

widely varying temps

exosphere

almost no molecules

Explanation:

Answer:

Hope this helps!!

Answer: Gamma rays

Explanation:

Answer:

Gamma rays are the most powerful

GAMMA RAYS

Gamma-rays are a form of electromagnetic radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Gamma-rays can be used to treat cancer, and gamma-ray bursts are studied by astronomers.

Electromagnetic (EM) radiation is transmitted in waves or particles at different wavelengths and frequencies. This broad range of wavelengths is known as the electromagnetic spectrum. The spectrum is generally divided into seven regions in order of decreasing wavelength and increasing energy and frequency. The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV), X-rays and gamma-rays.

Gamma-rays fall in the range of the EM spectrum above soft X-rays. Gamma-rays have frequencies greater than about 1,018 cycles per second, or hertz (Hz), and wavelengths of less than 100 picometers (pm), or 4 x 10^9 inches. (A picometer is one-trillionth of a meter.)

Gamma-rays and hard X-rays overlap in the EM spectrum, which can make it hard to differentiate them. In some fields, such as astrophysics, an arbitrary line is drawn in the spectrum where rays above a certain wavelength are classified as X-rays and rays with shorter wavelengths are classified as gamma-rays. Both gamma-rays and X-rays have enough energy to cause damage to living tissue, but almost all cosmic gamma-rays are blocked by Earth's atmosphere.

Answer:

= 7,600 Joules

Explanation:

Heat required to raise the temperature of a material is given by the formula;

Heat = mass × specific heat capacity × change in temperature.

In this case;

mass =22.8 g or 0.0228 kg

specific heat capacity = 390 J/kg°C

Temperature change = 875°C - 20°C = 855 °C

Therefore;

Heat = 0.0228 kg × 390 ×855

        = 7,602.66 Joules

        = 7,600 Joules

Answer:

Z

Explanation:

The figure represented the ray diagrams produced by a convex (converging lens). The image will appear at the point where the purple ray and the orange ray meet, so at point Z.

As we see from the picture, the image will be:

- Real (because it is behind the lens, and it can be projected on a screen)

- Inverted (the image is upside down)

- Larger than the object (we can see it by noticing that the distance between the point of intersection purple-orange ray and the axis is larger than the size of the object)

Answer:

Its X

Explanation:

Answer:

Iron

Explanation:

In a high mass star life cycle, there are 5 stages;

Stage 1: hydrogen nuclei combines to form helium

Stage 2: Helium combines to form carbon

Stage 3: carbon used to form heavy metals such as Iron

Stage 4: Supernova explosion

Stage 5: Core of the star collapses

In light mass star life cycle, the core of the star collapses after all the helium combines to form carbon.

Answer:

D. iron

Explanation:

Answer:

The answer is A and D but if you want one anwer i think the anwer is A

Explanation:

Increase the height at point A will increase the kinetic energy of the roller coaster. Option A is correct.

The energy of the body by the virtue of its motion is known as the kinetic energy of the body. It is defined as the product of half of mass and square of the velocity.

According to the law of conservation of energy, the total energy is defined as the sum of kinetic energy and potential energy.

Total energy = kinetic energy+energy+potential energy

Also, the energy can not be created nor be destroyed can be transferred from one form to another form.

Work =  Force × distance

Kinetic energy = work = weight  × height traveled

Increase the height at point A will increase the kinetic energy of the roller coaster.

Hence, option A is correct.

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Answer:

Mass is a measurement of the amount of matter something contains, while Weight is the measurement of the pull of gravity on an object.

Explanation:

Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. Weight is measured on a scale.

Final answer:

Mass is a measure of the amount of matter an object contains and is constant regardless of location, while weight is the gravitational force acting on an object's mass and varies with location. The statement that mass measures weight is false.

Explanation:

Understanding Mass and Weight

The statement 'Mass is a measure of weight' is false. Mass is a measure of the amount of matter an object contains and is independent of its location. It is typically measured in kilograms. Weight, in contrast, is a measure of the force of gravity acting on an object, which can vary depending on where the object is in the universe. Weight is equal to the mass of an object multiplied by the local acceleration due to gravity, and it is measured in newtons or pounds.

Common misconceptions often stem from the interchangeable use of mass and weight in everyday language. However, it's important to recognize that mass is a scalar quantity, which does not change with location, while weight is a vector quantity that does change depending on the gravitational pull at a given location.

For instance, an individual's mass remains consistent whether they are on Earth, the moon, or floating in space, but their weight would differ significantly in each of these locations due to varying gravitational forces.

Answer:

False.

Explanation:

Isolated magnetic poles or magnetic monopoles cannot be found in nature.

Request: Please mark me the Brainliest.

Answer:immediately

Explanation:

I think its like four words put together

The answer is:

The kinetic energy of the object is equal to 85 J.

The kinetic energy involves the speed and the mass of an object in motion. We can calculate the following the work needed to speed an object (kinetic energy) using the equation:

[tex]KineticEnergy=\frac{1}{2}mv^{2}[/tex]

Where,

m, is the mas of the object

v, is the speed of the object.

Now, we are given:

[tex]mass=m=6.8kg\\speed=v=5\frac{m}{s}[/tex]

So, substituting and calculating the kinetic energy of the object, we have:

[tex]KineticEnergy=\frac{1}{2}*6.8kg*(5\frac{m}{s})^{2}[/tex]

[tex]KineticEnergy=\frac{1}{2}*6.8kg*(25\frac{m^{2}}{s^{2}})[/tex]

[tex]KineticEnergy=\frac{1}{2}*170kg\frac{m^{2}}{s^{2}}[/tex]

[tex]KineticEnergy=85kg\frac{m^{2}}{s^{2}}=85J[/tex]

We have that the kinetic energy of the object is equal to 85 J.

Have a nice day!

Answer:

its 85j

Explanation:

just took the test

These images indicate that different kinds of electromagnetic radiation can be used to detect various types of stars. (C)

Choices 'A' and 'B' are absurd.  "Important" is a wishy-washy, rubber word.  It means different things to different people, and it can even mean different things to the same astronomer at different times, depending on what he's trying to see at that moment.

Answer:

Divergent - This type of evolution often occurs when closely related species diversify to new habitats. On a large scale, divergent evolution is responsible for the creation of the current diversity of life on earth from the first living cells. On a smaller scale, it is responsible for the evolution of humans and apes from a common primate ancestor.

Convergent - Convergent evolution causes difficulties in fields of study such as comparative anatomy. Convergent evolution takes place when species of different ancestry begin to share analogous traits because of a shared environment or other selection pressure. For example, whales and fish have some similar characteristics since both had to evolve methods of moving through the same medium: water.

Parallel evolution - Parallel evolution occurs when two species evolve independently of each other, maintaining the same level of similarity. Parallel evolution usually occurs between unrelated species that do not occupy the same or similar niches in a given habitat.

Final answer:

Evidence of biological evolution includes fossil evidence which shows changes in species over time, molecular evidence demonstrating evolutionary relationships through DNA comparisons, and homologous and vestigial structures that indicate common ancestry and the modification of species.

Explanation:

There are multiple lines of evidence that help support the theory of biological evolution. Here are three distinct forms of evidence:

Each form of evidence is used in conjunction with others to paint a comprehensive picture of life's history on Earth, and how organisms have changed and diversified over time

Answer:

Constant speed.

Explanation:

Because when the speed of an object remains the same - it does not increase or decrease - we say it is moving at a constant speed.

Hope I helped :)

Final answer:

Speed that does not change is referred to as constant speed or uniform speed. It is a scalar quantity, indicating magnitude only, and uniform motion involves maintaining the same velocity, including both speed and direction.

Explanation:

Speed that does not change is referred to as constant speed or uniform speed. When an object is moving at constant speed, it covers equal distances in equal intervals of time regardless of the direction of motion. Speed, being a scalar quantity, is only concerned with magnitude, not the direction of the travel.

Motion at a constant velocity, or uniform motion, means that the position of the object is changing at the same rate over time, and this typically indicates that there are no changes in speed and direction – the velocity is consistent. However, when referring specifically to speed without direction, constant or uniform speed can occur even if the direction changes.

Answer:

the answer is B

Explanation:

The mass and weight of that object on Mars is .The correct option is

B.

The object experiencing an attraction force towards the another body when placed still on any planet.
The mass of an object is constant on any planet.

Mass of the object on earth = mass of the object on mars = 71kg

The weight is the product of the mass and its acceleration due to gravity.

W=m x g

The acceleration due to gravity on Earth is 10m/s², then the acceleration due to  gravity on Mars is

0.38 x 10 = 3.8m/s²

The weight of that object on Mars is

W =71 x 3.8

W = 269.8 Newtons

The weight is approximately 270 N.

Thus, The mass and weight of that object on Mars is 71 kg and 270 N. The correct option is B.

Learn more about force on gravity.

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Answer:

c

Explanation:

Mineral water, water, and salt water are all liquid solutions, while oxygen is a gas. Gases are less dense than liquids.

Answer:

600Hz

Explanation:

In electrical systems of alternating current, the harmonics are, as in acoustics, frequencies multiples of the fundamental working frequency of the system and whose amplitude decreases as the multiple increases. For example, if we have systems fed by the 50 Hz network, harmonics of 100, 150, 200, etc. may appear.

In our case having a fundamental wave of 100Hz, I can have harmonics of 200,300,400, ..., 600Hz

Answer:

B

Explanation:

The correct answer is B) have unlike charges. Since they are attracted to each other they have to be unlike

Final answer:

A negative value for net electrostatic force signifies that the two charged objects have unlike charges, which attract each other. So the correct option is B.

Explanation:

When calculating the net electrostatic force, a negative value indicates that the two charged objects involved have unlike charges. This is because Coulomb's Law states that the force exerted on one charged particle by another is directed away from the other particle if both have the same kind of charge, resulting in a positive value for the force, signifying repulsion. However, if the value of the force is negative, it implies attraction, as the force is directed toward the other particle; this occurs only when the charges are unlike (one positive and the other negative).

Using the reference information provided, it's clear that unlike charges exhibit an attractive force toward each other which would result in a negative value when calculated, as the direction of the force is opposite to that of repulsive force between like charges.