calculate the critical angle of water if the velocity of light in water is 2.2×10^8m/s. ( given, velocity of light in air = 3× 10^8m/s​

Answer:

6.67km/hr²

Explanation:

Given parameters:

Velocity  = 40km/h

Time  = 6h

Unknown:

Acceleration = ?

Solution:

Acceleration is the rate of change of velocity with time.

  Acceleration  = \(\frac{v - u}{t}\)  

v is the final velocity

u is the initial velocity

t is the time

    Acceleration  = \(\frac{40 - 0}{6}\)   = 6.67km/hr²

The frequency and time interval are 2 seconds and 0.5 Hz, respectively.

One oscillation: The oscillating body moves completely back and forth in a single motion, or oscillation.

The frequency is the number of vibrations the body makes in a second.

Time span: This is the amount of time it takes a body to complete one oscillation.

Time period is equal to how long the pendulum swings over how many oscillations it makes.

20/10=2s

Frequency =1/Time 1/2 = 0.5Hz

In light of this, the time interval and frequency are 2 seconds and 0.5 Hertz, respectively.

How frequently a periodic wave shape or signal repeats itself at a specific amplitude is expressed as frequency. It can be measured in hertz, kilohertz, megahertz, etc.

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Answer:

C

Explanation:

The substances are changed.

A chemical equation describes a chemical reaction. Reactants are starting materials and are written on the left-hand side of the equation. Products are the end result of the reaction and are written on the right-hand side of the equation .

Answer:

The answer is D. They are a mass.

Answer:

“they have mass” because if they don’t have mass they can’t exert force even if they have speed if they have no mass they can’t do anything or exert force

Explanation:

The velocity of the mass after the force has stopped acting is 14 m/s.

The velocity of an object is the speed at which the object is moving in a specified direction.

Momentum is related to velocity and mass by the formula:

The velocity of the mass after 8 seconds is first determined.

Change in linear momentum = (1/2 × 2 × 6) + (6 × 4) + (1/3 ×2 × 6) = 36 kgm/s

Initial momentum = 18 kg × 12 m/s = 216 kgm/s

Final momentum = 216 + 36 = 252 kgm/s

Final Velocity = final momentum/mass

Velocity = 252/18 = 14 m/s

After 8 seconds, the force stops acting.

Therefore, the velocity of the mass after the force has stopped acting is 14 m/s.

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Answer:

B

Explanation:

The first modern personality test was the Woodworth Personal Data Sheet, which was first used in 1919. It was designed to help the United States Army screen out recruits who might be susceptible to shell shock.

so, B is correct

Answer:

The answer is B, I hope this helps.

1) Note that the Roof is dark colored. Given the laws of physics, it will absorb all light.

2) the window is transparent, hence, it will transmit ALL light.

3) the door is dark-colored but has some glass on it. Thus, it will absorb MOST but not all light.

4) the side of the building which is painted white will reflect all light.

Note that dark surfaces absorb light because they are able to absorb photons, or particles of light, and convert them into other forms of energy.

This is because the atoms and molecules in dark surfaces have a large number of unpaired electrons that are able to absorb the energy of photons and transition to a higher energy state.

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Answer:

Efficiency: 0.4 (40%)

Explanation:

The efficiency of a simple machine is given by the ratio

n = w¹/w²

where

w² is the input work of the machine

w¹ is the output work of the machine

For the machine in this problem, we have:

w¹ = 800j is the output work

w² = 2000j is the input work

Therefore, the efficiency of the machine is

n = 800/2000 = 0.4

Which can be also written as percentage:

n = 0.4 × 100 = 40%

hope it helps you

The approximate distance from the Earth to the Sun is about 93 million miles

The average distance from the Earth to the Sun is about 93 million miles (149.6 million kilometers). This distance is known as an astronomical unit (AU) and it is used to measure distances within the solar system. It is important to note that this distance is not a constant and varies slightly over time due to the elliptical shape of Earth's orbit around the Sun.

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Answer:

Given

mass (m) =5kg

velocity (v) =6m/s

momentum (p) =?

Form

p=mv

5kgx6m/s

p=30kg.m/s

momentum =30kg.m/s

A) The electron is in the region of nonzero field for 3.5 × 10^-9 seconds.b) The kinetic energy of the electron is 6.44 × 10^5 eV.

a) The formula used to find the time taken by the electron in the region of the nonzero field is given by,t = L / v

where L is the distance travelled and v is the velocity of the electron.t = 2.1 × 10^-2 / (6.0 × 10^6)t = 3.5 × 10^-9 secondsb)

The formula used to find the kinetic energy of the electron is given by,K.E = 1/2 × m × v^2

where m is the mass of the electron and v is its velocity.

Here, we can use the value of v obtained in part (a).K.E = 1/2 × 9.11 × 10^-31 × (6.0 × 10^6)^2K.E = 1.03 × 10^-13 J

To convert this into eV, we divide by the charge of an electron, which is 1.6 × 10^-19 C.K.E = 1.03 × 10^-13 / 1.6 × 10^-19K.E = 6.44 × 10^5 eV

Answer: a) The electron is in the region of nonzero field for 3.5 × 10^-9 seconds.b) The kinetic energy of the electron is 6.44 × 10^5 eV.

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The total inductance of the three coils connected in series is 4.35 henries.

To find the total inductance of coils connected in series, you simply add up the individual inductance values. However, it's important to ensure that all the inductance values are in the same unit before performing the addition.

Given that the inductance values are 250 millihenries, 3.5 henries, and 600 millihenries, we need to convert all the values to the same unit before adding them.

Converting the values to henries:

250 millihenries = 0.25 henries

600 millihenries = 0.6 henries

Now we can add the inductance values:

Total inductance = 0.25 henries + 3.5 henries + 0.6 henries

Total inductance = 4.35 henries

Therefore, the total inductance of the three coils connected in series is 4.35 henries.

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The proportion of variance accounted for is 22.09%.

A correlation coefficient is a number between -1 and 1 that tells you the strength and direction of a relationship between variables.

In other words, it reflects how similar the measurements of two or more variables are across a dataset.

To find the proportion of variance accounted for, you'll need to square the correlation coefficient between x and y. In this case, the correlation coefficient is 0.47.

1: Square the correlation coefficient (0.47^2).
0.47 * 0.47 = 0.2209

2: Convert the result into a percentage.
0.2209 * 100 = 22.09%

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The statement "Sunspots are brighter than the rest of the sun's surface" is false.

Magnetism is a physical quality mediated by a magnetic field that refers to the ability to create attracted and repulsive occurrences in other substances. Magnetism is the force that magnets exert when they attract or repel one another. The movement of electric charges causes magnetism. Every material is composed of microscopic components known as atoms. Each atom contains electrons, which are charged particles. Magnetism is caused by attraction when two items are brought together or repulsion when two objects are moved apart. A magnet is an item with magnetic qualities. A magnet, for example, may attract another thing.

Here,

Sunspots are really darker than the surrounding photosphere, and thus appear as black spots on the sun's surface. This is because large magnetic fields are concentrated in these areas, inhibiting convection and cooling the surface.

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Answer:

potential energy=mgh

=50×10×20

=10000 J

Answer:

3000J

Explanation:

The gravitational energy for any object is given by E=mgh

where m is mass, g is gravitational field strength anf h is height above ground

Since the magnetic force and velocity are orthogonal, the velocity only changes in direction but not in magnitude . Circular motion is the end consequence. The force is in the opposite direction from the right-hand rule and has a negative charge.

Uniform In circular motion, an object moves in two dimensions with a constant speed in a fixed circular direction; however, because the object's direction changes at every point, the velocity also changes, and the direction at each point is always the tangent.

In physics, magnetic force is referred to as an object's maximal size and direction. Both vector and scalar values use magnetic force as a common factor. We understand that by definition

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Answer: The velocity simply changes in direction, not magnitude, as the magnetic force and velocity are orthogonal.

Explanation: The velocity simply changes in direction, not magnitude, as the magnetic force and velocity are orthogonal. The resultant motion is circular. The force has a negative charge and is directed in the opposite direction from the right-hand rule.

Uniform In a circular motion, an item moves in two dimensions with a constant speed in a fixed circular direction; yet, because the object's direction varies at each point, the velocity also alters, and the direction at each point is consistently the tangent.

As an object's maximum size and direction, the magnetic force is referred to in physics. Magnetic force is a factor that is present in both scalar and vector values. We comprehend that by nature.

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Answer:

-3m/s²

2400N

Explanation:

Given parameters:

Mass of tram  = 800kg

Time taken   = 6s

Constant speed  = 18m/s

Unknown:

deceleration  = ?

force on brake = ?

Solution:

Deceleration is the opposite of acceleration. This is the rate of change of velocity with time;

    Deceleration  = \(\frac{V - U}{t}\)

V is the final velocity = 0m/s

U is the initial velocity  = 18m/s

t is the time taken

   Deceleration  = \(\frac{0-18}{6}\)  = -3m/s²

Force needed to to stop the tram;

        Force  = mass x acceleration

   Insert parameters and solve;

        Force  = 800 x 3  = 2400N

Answer:

At sea level

Explanation:

Because there is higher air pressure

This is not an ideal controlled investigation because the answer choice B, "The drafts at each window may be different because the windows aren’t near each other," is correct.

To conduct a controlled investigation, it is crucial to minimize variables that could affect the results.

In this case, the windows on the south and north sides of the house may have different draft levels due to their location and proximity to various environmental factors.

To achieve better control, Lyndon should ideally select windows that are in close proximity to each other, preferably on the same side of the house, to minimize the potential differences in drafts.

This would allow for a more accurate comparison between the two windows.

Additionally, answer choices A, C, D, and E are not directly related to the issue of controlling the investigation.

The size of the windows, the choice of temperature as an indicator, and the type of plastic used are valid factors to consider but do not pertain specifically to the control of the investigation.

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Answer:

Typical golf caddie responsibilities include carrying clubs, cleaning balls,

calculating distances and scores, and even replacing the divots - pieces of

grass and dirt that have been cut loose by the swift, forceful strikes of golf

clubs.

Answer:

the answer is 352.8m

Explanation:

Since the gravitational constant is denoted as g

\(g = 9.8 \: \frac{m}{ {s}^{2} }\)

and the ball needed 6 seconds to land, so we can calculate the height of the building as:

\(h = 9.8 \: \frac{m}{ {s}^{2} } \times {(6s)}^{2} = 9.8 \: \frac{m}{ {s}^{2} } \times 36 {s}^{2} = 352.8m\)

Answer:B

Explanation:

The electromotive force would cause 200 mA of current to flow through a 500ohm resistor is (D) 100 V.

The electromotive force that would cause 200 mA of current to flow through a 500 ohm resistor is 100 V. This can be determined using Ohm's law.Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. Mathematically, Ohm's law is represented by the equation V = IR, where V is voltage, I is current, and R is resistance.To find the electromotive force, we can rearrange Ohm's law to be E = IR, where E is electromotive force. Substituting the given values, we have:E = (0.2 A)(500 Ω)E = 100 V .

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Ohm's Law relates the following: volts, amperes, and resistance. Ohm's Law relates the following: volts, amperes, and resistance.

Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. The formula for Ohm's Law is: V = IR.

In simpler terms, this means that if you increase the voltage, the current will also increase, but if you increase the resistance, the current will decrease. It can be mathematically expressed as I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms. This relationship is extremely important in understanding and designing electrical circuits. I hope this long answer helps to explain Ohm's Law!

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