Light rays that are reflected twice inside a rain water droplet can produce a second-order rainbow. Is this true or false?

Answer:

If you were given the vector in vectorial form, for example, <5,7>, then the first number (5) will always be the x component and the second number (7) is the y component.

In other cases, you are given the magnitude of the vector and the angle created by said magnitude with respect to the y or x axis. In these cases, you must use the magnitude and angle of the vector as if it was the hypotenuse of a right triangle and find the values of x and y as the legs of said triangle using the sine and cosine created by the magnitude of the vector and the value of said magnitude.

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The driving force (df) of +15 mV propels K+ ions in an inwards directed manner.

noun Someone or anything with the ability to influence events: a motivating factor behind/for/in sth. One key factor influencing consumer spending has been the growth of stock market riches.

A stroller is put into motion when it is pulled. As long as the luggage is being pulled, the action continues. This indicates that the user's applied pull force is what propels the luggage. The force needed to draw or move the luggage is hence referred to as the driving force.

At equilibrium, the bottom of the cell ought to be negative in relation to the outside because K+ ions have an electromotive force of Ek = -78 mV.

Since Vm = -93 mV

df = Ek - Vm

= -78 mV - (-93 mV)

= +15 mV.

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Answer:

The correct answer will be "0.25 sec".

Explanation:

The graph of the given question is attached below.

According to the graph of the question,

Time,

T = 1 sec

For the upward velocity,

⇒ \(t = \frac{T}{4}\)

By putting the value, we get

⇒    \(=\frac{1}{4}\)

⇒    \(=0.25 \ sec\)

A force of 50 N was applied to an object with a mass of 5 kg, then the acceleration of the object will be 10 m/s².

The rate of change in an object's velocity with respect to time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.

Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well. The definition of acceleration is the change in velocity vector over a time interval divided by the time interval.

There are several types of acceleration :

According to the question, the given values are :

Force, F = 50 N

Mass, m = 5 kg

Force = m × a

a = 50 / 5

a = 10 m/s².

Hence, the acceleration of the object will be 10 m/s².

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Answer:

The car starts moving in the positive direction at x = 0.2 seconds. Initially it moves very little, but it covers a greater distance with each time increment.

Explanation:

Answer:  The car starts moving in the positive direction at x = 0.2 seconds. Initially it moves very little, but it covers a greater distance with each time increment.

Explanation: edmentum sample answer

Answer:

Conduction

Explanation:

Conduction is when heat or electricity is transmitted throughout a substance.

The energy transfer taking place through our body is called conduction. Our body is conductive and which make the electrical shock.

There are three different modes of energy transfer namely, conduction, convection and radiation. Conduction is the energy transfer mode on solids and convection is taking place in gases and liquids.

Radiation is the energy transfer mode through vacuum. In conduction the energy transfers easily through the chain of  closely packed molecules. Whereas in convection, the molecule which obtained an energy travels across the space and transfers to other molecules.

Our body transfers energy inside through conduction process. Skin is very conductive and the electrons from the wire can be passed through our body that's why we gets electrically shocked.

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Answer:

1568 J

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 80 Kg

Distance (d) = 5 m

Coefficient of kinetic friction (μ) = 0.4

Workdone (Wd) =?

Next, we shall determine the normal reaction. This can be obtained as follow:

Mass (m) = 80 Kg

Acceleration due to gravity (g) = 9.8 m/s²

Normal reaction (N) =?

N = mg

N = 80 × 9.8

N = 784 N

Next, we shall determine force of friction. This can be obtained as follow:

Coefficient of kinetic friction (μ) = 0.4

Normal reaction (N) = 784 N

Force of friction (F) =?

F = μN

F = 0.4 × 784

F = 313.6 N

Finally, we shall determine the work done. This can be obtained as follow:

Distance (d) = 5 m

Force of friction (F) = 313.6 N

Workdone (Wd) =?

Wd = F × d

Wd = 313.6 × 5

Wd = 1568 J

Thus, the workdone is 1568 J

The series circuit has components connected in a sequence, while the parallel circuit has components connected in different branches. If bulb B2 is replaced with a wire in the series circuit, bulb B1 will not light up, while in a parallel circuit, it will still light up.

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Answer:  YES

Explanation: The main difference between flood and tsunami  is that the flood is overflow of water that submerges land and tsunami is a series of water waves caused by the displacement by large volume of a volume of water

Answer:

WEEEEEEEEEEEEEEEEEEEEEEEEE

Explanation:

Answer: B

Explanation: ik trust me its right :)

Answer:

B)  5 gm

Explanation:

.5 g / cm^3   * 10 cm^3  =  5 gm     ( see how the 'cm^3' cancels out?)

In the physical activity pyramid, sedentary activities belong to Level D.

The Physical Activity Pyramid is a graphic representation of the different types of physical activities that are recommended for a healthy lifestyle.

The pyramid is divided into four levels, with the most important activities at the bottom and the least important at the top. The greatest and most significant activities for healthy everyday life are at the bottom and the least healthy activities at the top, which you should only perform occasionally.

Sedentary activities, which are activities that involve little or no physical movement, belong at the top of the pyramid, in Level D.

Level D is the smallest section of the pyramid, and it represents activities that should be limited in order to maintain good health.

Hence, option D is the correct choice.

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The time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

An echo is a repetition or reflection of a sound or signal. It can be caused by sound waves bouncing off a surface, signal interference, or the repetition of a message in communication.

The speed of sound in air at room temperature is approximately 343 meters per second. When a person claps, the sound waves propagate outward in all directions and reach the school building, where they bounce off and return to the person as an echo. The time it takes for the sound to travel the distance to the building and back to the person is the time interval between the clap and the echo.

To calculate the time interval, we can use the following formula:

time = distance / speed

where distance is the total distance traveled by the sound (twice the distance from the person to the school building), and speed is the speed of sound in air.

distance = 2 x 300m = 600m

speed = 343 m/s

time = 600m / 343 m/s = 1.75 seconds (rounded to two decimal places)

Therefore, the time interval between the man clapping and hearing his echo is approximately 1.75 seconds.

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Answer:Electric Current!

Explanation: Electric current ;)

The period of the pendulum, given that the pendulum has an angular velocity about the pivot point of 0.66 radians/sec is 9.52 seconds

First, we shall list out the given parameters from the question. This is shown below:

The period and angular velocity are related according to the following formula:

ω = 2π/ T

Inputting the given parameters, we can obtain the period of the pendulum as follow:

0.66 = (2 × 3.14) / T

0.66 = 6.28 / T

Cross multiply

0.66 × T = 6.28

Divide both sides by 0.66

T = 6.28 / 0.66

T = 9.52 seconds

Thus, we can conclude that the period of the pendulum is 9.52 seconds

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Answer:

vt3bryhtevy4g24vu5hy4

Answer:

1. Energy is required by the man to climb up the stairs.

2. No, it is not possible. Just like the man can only climb the steps one after another, energy transition in an electron occurs from one higher level to another.

3. Without insufficient energy, the man cannot climb on to a next higher step. Similarly, without having absorbed enough energy, electrons cannot transition from a lower to a higher energy level.

4. No. Just as the man cannot occupy any intermediate levels between steps because there are no such intermediate steps, electrons cannot occupy any space between energy level because  energy levels or shells are discrete or whole number values.

Explanation:

1. Energy is required by the man to climb up the stairs. Just like the man climbing a set of stairs, electrons will need to absorb energy in the form of light or collision with another electron in order to transition to a higher energy level. The electron is said to be excited.

2. No, it is not possible. Just like the man can only climb the steps one after another, energy transition in an electron occurs from one higher level to another. For each transition step, their is emission or absorption of electromagnetic radiation in the form of quantized units called photons.

3. Without insufficient energy, the man cannot climb on to a next higher step. Similarly, without having absorbed enough energy, electrons cannot transition from a lower to a higher energy level. This is due to the quantization of energy levels where there are only certain quantities of energy that an electron can have in an atom. If an electrons does not possess enough energy equal to that energy level, it cannot transition.

4. No. Just as the man cannot occupy any intermediate levels between steps because there are no such intermediate steps, electrons cannot occupy any space between energy level because  energy levels or shells are discrete or whole number values.

Answer:

1.Contact because its a contact force

2 Contact because when the car is stopping it is coming in to contact with the ground.

3 non Contact because magnets don't need to have contact they pull

4 non Contact because its not a contact force

Answer:

D

Explanation:

The velocity of the car would be 100 kilometer per hour.

Possible experimental errors with the motion lab are making a math error, incorrect measuring, cars not let go at right time, did not follow directions.

The difference between two measurements is called an error.

The error in measurement is a mathematical way to show the uncertainty in the measurement.

Thus, possible experimental errors with the motion lab are making a math error, incorrect measuring, cars not let go at right time, did not follow directions.

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(a) The frequency heard if only one siren is on is 5.08* 10⁸ Hz.

(b) The frequency of the beats is both sirens are on is 10.16* 10⁸ Hz.

(a) Given that,

Angular velocity = 0.8 rad/s

Linear velocity = angular velocity * radius

⇒ 0.8rad/s * 5m = 4 m/s

Wavelength = (V + U)/f

where,

V is the velocity of the wave

U is the velocity of the source

f is the frequency of the source

Wavelength = (350 m/s + 4 m/s ) / 600 Hz

Wavelength = 0.59m

The relation between wavelength and frequency is

v = f * λ

f = v/ λ = (3* 10⁸)/ 0.59 = 5.08* 10⁸ Hz

(b) Wavelength = (V' + U')/f'

⇒ (350 + 4) / (600 + 600 ) = 0.295 m

v = f * λ

f = v/ λ = (3* 10⁸)/ 0.295 = 10.16* 10⁸ Hz

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(a) The time taken for the ball to reach the height of the fence is 4.1 s.

(b) The position of the ball from the batter at the time is 111.33 m.

(c) Henry will have a home run.

The time taken for the ball to reach the height of the fence is calculated as follows;

\(h = v_0_y t - \frac{1}{2} gt^2\\\\(3 - 1.2) = (34 \times sin37)t - \frac{1}{2} (9.8)t^2\\\\1.8 = 20.46t- 4.9t^2\\\\4.9t^2 - 20.46t+ 1.8 = 0\\\\a = 4.9, \ b = -20.46, \ c = 1.8\\\\t = \frac{-b\pm \sqrt{b^2 - 4ac} }{2a} \\\\t = 4.1 \ s\)

The position of the ball at the time is calculated as follows;

\(X = v_x t\\\\X = (34 \times cos37) \times 4.1\\\\X = 111.33 \ m\)

Since, 111.33 m is greater than 106 m, Henry will have a home run.

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(1) When the driver is at rest, the restoring force exerted by spring is equal in magnitude to the driver's weight, so that

∑ F = s - mg = 0   ==>   s = mg = 617.4 N

If the spring is compressed 0.015 m, then the spring constant k is such that

617.4 N = k (0.015 m)   ==>   k = 41,160 N/m ≈ 41 kN/m

(2) The total mass of the passengers is

24 (68 kg) + 3 (15 kg) + 5 (3 kg) + 25 kg = 1717 kg

so that if everyone is at rest, the spring is compressed a distance x such that

kx = (1717 kg) g   ==>   x ≈ 0.41 m

Answer:

Static friction is what keeps the box from moving without being pushed, and it must be overcome with a sufficient opposing force before the box will move. Kinetic friction is the force that resists the relative movement of the surfaces once they're in motion.

Answer:

Explanation:

The speed in the medium is always slower than the speed in a vacuum.

The basic kinematic equations for horizontal and vertical motion are as follows:

s = v₀t + ¹/₂at²

Horizontal motion is:

x = v₀ₓt + ¹/₂aₓt²

x = v₀ₓt

x = v₀ cosαt

Because there is no air resistance: x = v₀ cosθt

Vertical motion is:

y = v₀\(__y\)t + ¹/₂a\(__y\)t²

y = v₀ sinαt - ¹/₂gt²

Solve both for the velocity trigonometric function term as follows:

y = v₀ sinαt - ¹/₂gt²

v₀sinαt = ¹/₂gt² + y

v₀sinα = ¹/₂gt² + y/t

and

x = v₀ cosαt

v₀cosα = x/t

Now divide these two equations and we get

v₀sinα/v₀cosα = tanα \(=\frac{1/2gt + \frac{y}{t} }{\frac{x}{t} }\)

tan α \(= \frac{1/2gt + \frac{y}{t} }{\frac{x}{t} } = \frac{gt^2}{2x} + \frac{y}{x}\)

tan α \(= \frac{gt^2}{2x} + \frac{y}{x}\)

Enter a value, x is the distance between the boarding 35.5 m, and y is the difference between the launch height and the drop point. The launch height is 15.5 m and the landing height is 11.0 m, so y = -4.5 m. Finally, we are told the projectile travel time is 2.2 s.

tan α \(= \frac{gt^2}{2x} + \frac{y}{x}\)

tan α \(= \frac{(9.8)(2.2)^2}{2(35.5)} + \frac{-4.5}{35.5}\)

tan α \(= 0.668 - 0.126\)

tan α \(= 0.542\)

     α = tan⁻¹ 0.542

     α = 28.4°

For the second launch, y₂ is +7.0 m launch altitude is still 15.5 m, but the deployment altitude is now 22.5 m, and x is still 35.5 m. The angle remains 28.4°. This time we don't know the flight time or initial velocity we are asked to find. Using horizontal distances, we can solve for time.

x = v₀.cosα.t

t² = x/v₀.cosα

Now do it for y₂:

          y₂ \(= v_0sin(\alpha) t - 1/2gt^2\)

          y₂ \(= v_0sin(\alpha) (\frac{x}{v_0cos(\alpha)} ) - 1/2g (\frac{x}{v_0cos(\alpha)} )^2\)

           y₂ \(= x tan (\alpha ) - \frac{gx^2}{2v_0cos(\alpha)^2}\)

 \(\frac{gx^2}{2v_0cos(\alpha)^2} = x tan (\alpha ) - y_2\)

We need to solve v₀:

   \(\frac{gx^2}{2v_0cos(\alpha)^2} =\frac{1}{ x tan (\alpha ) - y_2}\)

2v₀cos (α)² \(= \frac{gx}{ x tan (\alpha ) - y_2}\)

             v₀² \(= (\frac{1}{2cos(\alpha)^2} ) \frac{gx}{ x tan (\alpha ) - y_2}\)

            v₀² \(= (\frac{x^2}{cos(\alpha)^2} ) \frac{g/2}{ x tan (\alpha ) - y_2}\)

            v₀² \(= (\frac{x}{cos(\alpha)^2} ) \sqrt{ \frac{g/2}{ x tan (\alpha ) - y_2}}\)

Now we can enter values:

v₀² \(= (\frac{x}{cos(\alpha)^2} ) \sqrt{ \frac{g/2}{ x tan (\alpha ) - y_2}}\)

v₀² \(= (\frac{35.5}{cos(28.4^0)} ) \sqrt{ \frac{9.8/2}{ 35.5 tan (28.4^0) - 7.0}}\)

v₀² = 40.386 \(\sqrt{\frac{4.9}{12.17} }\)

v₀² = 40.386 (0.634)

v₀² = 25.62 m/s

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The middle ear compensates through 1) the area ratio of the tympanic membrane to the oval window (about 17x) and 2) the ossicular lever action (about 1.3x).

A) Due to impedance mismatch, only a small fraction of sound energy enters the liquid (Z2) from air (Z1).

Transmission coefficient T = 4Z1Z2/(Z1+Z2)^2. Assuming Z1=1 (air) and Z2=3400 (water), T ≈ 0.001, meaning 0.1% sound energy enters the liquid, while 99.9% is reflected.

B) Loss in dB = 10*log10(1/T) ≈ 30 dB.

The middle ear compensates through 1) the area ratio of the tympanic membrane to the oval window (about 17x) and 2) the ossicular lever action (about 1.3x).

Combined, they provide 22x amplification (27 dB). Both mechanisms contribute significantly to compensate for the loss.

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