If we need a 1 second exposure with a f/8 lens, how long do we need to capture the same amount of light with an f/4 lens?a. 4 sb. 1/4 sc. 2 sd. 1/2 s

(i) Wavelength is 0.1 m (ii) the speed of the wave is 1.5 m/s. (iii) the time period the wave is 0.067 seconds.

Given:

Wavelength (λ) = 10 cm = 0.1 m

Frequency (f) = 15 Hz

(i) The distance between successive crests is equal to one wavelength. Therefore, the distance between successive crests can be calculated as:

Distance between successive crests = Wavelength (λ) = 0.1 m

(ii) The speed of the wave can be calculated using the formula:

Speed (v) = Wavelength (λ) x Frequency (f)

Substituting the given values, we get:

v = λ x f

v = 0.1 m x 15 Hz

v = 1.5 m/s

Therefore, the speed of the wave is 1.5 m/s.

(iii) The period (T) of the wave is the time taken for one complete wave cycle. It can be calculated using the formula:

Period (T) = 1 / Frequency (f)

Substituting the given values, we get:

T = 1 / f

T = 1 / 15 Hz

T = 0.067 s

Therefore, the period of the wave is 0.067 s.

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Assuming that Mars really was warmer and wetter in the past, it is probably because mars had a much thicker atmosphere with a much stronger greenhouse effect at the time. Option A is correct.

The current scientific understanding is that Mars was warmer and wetter in the past due to having a much thicker atmosphere that trapped heat and created a stronger greenhouse effect. This allowed liquid water to exist on the planet's surface, which is not possible under the current thin and cold atmosphere.

The loss of much of the Martian atmosphere, due to various factors including the planet's weaker gravity, is believed to have caused the planet's climate to change dramatically over time. The other options, such as the Sun being significantly brighter or Mars being closer to the Sun, would not have been significant factors in the planet's climate history. And Mars being larger and more massive would not have made a significant difference in its atmosphere or greenhouse effect. Hence, option A is correct.

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Answer:

Tornadoes

A tornado is a violently rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloudExplanation:

Answer:

Displacement = velocity x time.

=4×3

=12m/s

\( \sf• \: Current \: (I) = 100 \: Amps.\)

\( \sf• \: Resistance \: (R) = 50 \: ohms\)

\( \\ \)

\( \sf• \: Voltage \: (V)\)

\( \\ \)

\( \huge\bf{ \underline{Solution:- }}\)

\( \bf \red{ \bigstar{ \: The \: formula \: of \: Voltage \: (V) = IR}}\)

\( \rightarrow \sf V = 100 \times 50\)

\( \rightarrow \sf V = 5000\)

\( \\ \)

\( \bf \purple{Therefore, \: Volatage \: is \: 5000 \: v.}\)

An electrical conductor that has very low resistance to current at low temperatures is called a(n) Superconductor.

A superconductor's hatred of magnetic fields is one of its basic characteristics. A superconductor generates its own equal and opposite magnetic field when a magnetic field is applied by a scientist.

A north-seeking pole (north pole) and a south-seeking pole (south pole) are found at either end of every magnet. Depending on how they are arranged, these two oppositely charged poles enable magnets to both repel and attract other magnets.

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The mass m of the block on the left is 16 Kg , correct answer.

What is friction?

Friction is a force that prevents two solid objects from rolling or sliding over one another. Although frictional forces, such the traction required to walk without slipping, may be advantageous, they can provide a significant amount of resistance to motion.

Think about how a 100 kilogramme block would move.

beginning speed (Vi) = 0 m/s

a stands for speed.

d=displacement=1 m

Time taken is t = 0.53 seconds.

Using the formula:

d=Vi t+(0.5)a t2

1 = (0) (0.53) + (0.5) a (0.53) (0.53)

2

a = 7.12 m/s2

Acceleration for an at wood machine is expressed as

7.12 = (100 - m) (9.8)/ (100 + m)

m = 15.84 kg

m = 16 kg

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\(\boxed{\large{\bold{\blue{ANSWER~:) }}}}\)

\(\sf What \: is \: acceleration? \\ \\ \sf The \: rate \: of \: change \: of \: velocity \: of \: an \\ \sf object \: with \: respect \: to \: time \\ \sf is \: known \: as \: acceleration. \)

Answer:

Solar panels have increased in efficiency over the past 20 years

Explanation:

Because if efficiency have increased other technologies will be discovered

Answer:

Solar panels have increased in efficiency over the past 20 years

Explanation:

Answer:

The thermal efficiency, \(\eta _{reheat}\), of the Rankine cycle with reheat is 36.81%

Explanation:

p₁ = 8 MPa = 80 Bars

T₁ = 450°C = 723.15 K

From steam tables, we have;

v₁ = 0.0381970 m³/kg

h₁ = 3273.23 kJ/kg

s₁ = 6.5577 kJ/(kg·K) = s₂

The p₂ = 0.8 MPa

T₂ = Saturation temperature at 0.8 MPa = 170.414°C = 443.564 K

h₂ = 2768.30 kJ/kg

\(T_{2'}\) = 400°C = 673.15 K

\(h_{2'}\) = at 400°C and 0.8 MPa = 3480.6 kJ/kg

p₃ = 10 kPa = 0.1 Bar

T₃ = Saturation temperature at 10 kPa = 45.805 °C = 318.955 K

h₃ = 2583.89 kJ/kg

h₄ = \(h_{3f}\) = 191.812 kJ/kg

The thermal efficiency, \(\eta _{reheat}\), of a Rankine cycle with reheat is given as follows;

\(\eta _{reheat} = \dfrac{\left (h_{1}-h_{2} \right )+\left (h_{2'}-h_{3} \right )-W_{p}}{h_{1}-\left (h_{4}+W_{p} \right )+\left (h_{2'}-h_{2} \right )}\)

Therefore, we have;

\(\eta _{reheat} = \dfrac{(3273.23 -2768.30 ) + (3480.6 -2583.89 ) - 8.04)}{(3273.23 -(191.812 + 8.04) + (3480.6 -2768.30 ) } = 0.3681\)

Which in percentage is 36.81%.

Answer:

c and a

Explanation:

ape x

To answer this question, we need to know the positions and charges of the two that exert a force on charge q1. We also need to know the distances between the charges.

Assuming that the charges are stationary, the net force on charge q1 is the vector sum of the electrostatic forces exerted by the other two charges.

The electrostatic force between two charges q1 and q2 separated by a distance r is given by Coulomb's law:

F = k * (q1 * q2) / r^2

Where k is the Coulomb constant, approximately equal to 9 × 10^9 N·m^2/C^2.

The vector sum of the individual forces gives the magnitude of the net force on charge q1. Let F1 be the force exerted on q1 by charge q2, and F2 be the force exerted on q1 by charge q3. Then the net force Fnet on q1 is:

Fnet = F1 + F2

The direction of the net force on q1 will depend on the directions of the individual forces. If the forces are in the same direction, the net force will be in that direction. If the forces are in opposite directions, the net force will be in the direction of the larger force.

So, to determine the net force and its direction, we need to know the charges and distances involved. Once we have that information, we can use Coulomb's law to calculate the individual forces and then add them vectorially to obtain the net force.

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A graphite rod in a wood or metal holder is commonly referred to as a pencil. Pencils are widely used writing instruments that consist of a cylindrical graphite core encased in a wooden or metal barrel.

The graphite core is made of a mixture of graphite and clay, which provides the characteristic smoothness and darkness of the pencil's mark.

The wooden or metal holder serves as a protective and ergonomic casing for the graphite core, allowing for comfortable and controlled writing or drawing. Pencils are versatile tools used in various applications, including writing, sketching, drafting, and artistic pursuits.

They are easily sharpened to expose fresh graphite, making them a convenient and popular choice for many people's everyday writing and drawing needs.

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Answer:no because distance is weaker than gravity

Explanation:the strenght of the gravita force between the two objects depend on two facto mass and distance the force of gravity the masses  exert on each other increases the force of gravity decreases if the distance is doubled the force of gravity is one fourth as strong as before

Answer: Bunsen Burner

Explanation:

A Bunsen burner is a gas-powered laboratory appliance used to heat substances. The correct answer is the Bunsen burner.

It is made comprised of a metal tube that is connected to a gas source, allowing for regulated gas combustion to create a flame.

For various scientific uses, such as heating test tubes, boiling liquids, or doing experiments that need regulated heating, the flame created by a Bunsen burner can be adjusted to offer varied levels of heat intensity.

Chemistry labs frequently contain bunsen burners, which are necessary equipment for many chemical investigations and operations.

Therefore, A Bunsen burner is a gas-powered laboratory appliance used to heat substances. The correct answer is the Bunsen burner.

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The complete question is:

What is a device used to heat chemicals which is powered by gas?

Answer:

your total displacement is 2 miles north

Explanation:

claim

[klām]

VERB

state or assert that something is the case, typically without providing evidence or proof.

"he claimed that he came from a wealthy, educated family" · [more]

synonyms:

assert · declare · profess · maintain · state · hold · affirm · avow · aver · [more]

NOUN

an assertion of the truth of something, typically one that is disputed or in doubt.

"he was dogged by the claim that he had CIA links" · [more]

synonyms:

assertion · declaration · profession · affirmation · avowal · averment · protestation · representation · contention · submission · case · allegation · pretense · asseveration

a demand or request for something considered one's due.

"the court had denied their claims to asylum"

Answer:

the first person is right at all

Answer:

Kinetic Energy

Explanation:

Kinetic energy is the energy of a moving object. As thermal energy comes from moving particles, it is a form of kinetic energy.

The entry to record the transaction of a corporation issuing 210 shares of its $5 par value common stock in payment of a $2,900 charge from its accountant for assistance in filing its charter with the state would include the following:

Debit: Organization Costs Expense (or Professional Fees Expense) - $2,900

Credit: Common Stock (Par Value) - $5 x 210 shares - $1,050

Credit: Additional Paid-in Capital (or Paid-in Capital in Excess of Par Value) - $2,900 - $1,050 = $1,850

Explanation:

The debit to Organization Costs Expense (or Professional Fees Expense) records the expense incurred for the accountant's assistance in filing the charter.

The credit to Common Stock accounts for the par value of the shares issued. In this case, it would be $5 multiplied by the 210 shares.

The credit to Additional Paid-in Capital (or Paid-in Capital in Excess of Par Value) accounts for the difference between the total payment made ($2,900) and the par value of the shares issued ($1,050). This represents the amount contributed by shareholders above the par value.

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Answer:

An air mass that is moving from the north pole toward the equator would be turned to the East because of the spinning of the earth on its axis

Explanation:

An air that is moving from the North pole toward the equator will be turned to the East (right) because of the spinning of the earth around its own axis.

The Coriolis Effect can be described as an apparent effect generated by a rotating frame of reference. The effect takes place when an object moving along a straight path can be viewed from a non-fixed frame of reference.

The moving frame of reference is the one in which the Earth rotates at a fixed speed.  The Coriolis effect creates wind patterns near the earth’s surface, that move to the east toward the equator and to the west toward the poles. These wind patterns are responsible for moving clouds around the globe and creating weather patterns.

Coriolis force can be described as a fictitious force resulting from the rotational movement of the earth. It only affects the wind direction and not the wind speed. The magnitude of Coriolis force can be calculated from the wind speed.

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The increase in internal energy of the tie and spike is approximately 1.12 Joules.

The initial kinetic energy of the spike is:

K_i = (1/2) * m * v^2

K_i = (1/2) * 0.60 kg * (1.8 m/s)^2

K_i = 1.94 J

The amount of kinetic energy that is absorbed as internal energy is:

K_absorbed = 0.578 * K_i

K_absorbed = 0.578 * 1.94 J

K_absorbed = 1.12 J

Thus,the value is 1.12 Joules.

Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Applying a force requires us to do work. After work has been done, energy has been transferred to the object, and the object will be moving with a new constant speed.

Kinetic energy is the energy of motion, observable as the movement of an object or subatomic particle. Every moving object and particle have kinetic energy. A person walking, a soaring baseball, a crumb falling from a table and a charged particle in an electric field are all examples of kinetic energy at work.

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The y-component of the magnitude of the force is found as 80.0 N.

Thus,

X-components of force: Fx = F cosθ

Y-components of force: Fy = F sinθ

Magnitude of the force: F = 95. 3 N.

Direction of the force: θ = 57. 1 degree to the horizontal,

y-component of the force:

Fy = 95.3 sin 57. 1

Fy = 80.0 N

Thus, the y-component of the magnitude of force is found as 80.0 N.

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The frequency of the minute hand is 1/60 Hz. Given that the minute hand of a clock completes one revolution in one hour and there are 3,600 seconds in one hour.

To calculate the frequency of the minute hand: Frequency of the minute hand = No. of revolutions per secondFirstly, let us calculate the number of revolutions of the minute hand in one second.1 hour = 60 × 60 = 3600 secondsIn one hour, the minute hand completes 1 revolution. So, in 1 second, the minute hand completes 1/3600 of the revolution.Now, we can calculate the frequency of the minute hand.

Frequency of the minute hand = No. of revolutions per second Frequency of the minute hand = 1/3600 HzTo calculate the frequency of the minute hand, we can use the following steps: Step 1: Calculate the number of revolutions of the minute hand in one second.1 hour = 60 × 60 = 3600 seconds In one hour, the minute hand completes 1 revolution.

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Answer:

If we are talking fusion. Yes they both use nuclear fusion.

if its fission or anything else no.

Answer:

The total power they will consume in series is approximately 2.257 W

Explanation:

The connection arrangement of the headlight and the engine starter = Parallel to the battery

The voltage of the battery, V = 12.0 V

The power at which the headlight operates in parallel, \(P_{headlight}\) = 38 W

The power at which the kick starter operates in parallel, \(P_{kick \ starter}\) = 2.40 kW

We have;

P = V²/R

Where;

R = The resistance

V = The voltage = 12 V (The voltage is the same in parallel circuit)

For the headlight, we have;

R₁ = V²/\(P_{headlight}\)  = 12²/38 = 72/19

R₁ = 72/19 Ω

For the kick starter, we have;

R₂ = V²/\(P_{kick \ starter}\) = 12²/2.4 = 60

R₂ = 60 Ω

When the headlight and kick starter are rewired to be in series, we have;

Total resistance, R = R₁ + R₂

Therefore;

R = ((72/19) + 60) Ω = (1212/19) Ω

The current flowing, I = V/R

∴ I = 12 V/(1212/19) Ω = (19/101) A

We note that power, P = I²R

In the series connection, we have;

\(P_{headlight}\) = I² × R₁

∴ \(P_{headlight}\) = ((19/101) A)² × 72/19 Ω = 1368/10201 W ≈ 0.134 W

The power at which the headlight operates in series, \(P_{headlight, S}\) ≈ 0.134 W

\(P_{kick \ starter}\) = ((19/101) A)² × 60 Ω = 21660/10201 W ≈ 2.123 W

The power at which the kick starter operates in series, \(P_{kick \ starter, S}\) ≈ 2.123 W

The total power they will consume, \(P_{Total}\) = \(P_{headlight, S}\) + \(P_{kick \ starter, S}\)

Therefore;

\(P_{Total}\) ≈ 0.134 W + 2.123 W = 2.257 W

True, The covariance between two variables can indeed be positive or negative.

Covariance measures the direct relationship between two variables and tells how they vary from each other. A positive covariance indicates that the variables tend to move in the same direction, which means that when one variable increases, the other variable also increases interdependently. Again, a negative covariance shows an inverse relationship, where one variable tends to drop while the other variable increases.

A covariance value of zero implies that there's no direct relationship between the variables. It doesn't inescapably mean there's no relationship at each, as there could still be a nonlinear or non-linearly affiliated pattern between the variables.

The magnitude of the covariance doesn't give the strength of the relationship between the variables. To measure the strength and direction of the relationship, it's frequently more reliable to use the correlation measure, which is deduced from the covariance and provides a standardized measure between-1 and 1.

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In dual air systems, the pressure should increase from 85 to 100 psi within 45 seconds of the engine reaching working rpms. (If the vehicle has air tanks that are greater than the required size.

Through friction, the braking system transforms the kinetic energy in your moving vehicle into heat energy. Your more than four thousand pound metal machine is stopped and slowed down using that energy. The idea is the same, but the equipment is a little more complicated.

The car may veer to one side if the braking system isn't working properly. Accidents resulting from this circumstance may range in severity from minor collisions to catastrophic ones. If there has been a brake fluid leak, if the brakes need to be changed, or if the stopper has locked, you could also sense tugging.

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Infrared wave basically have shorter wavelengths than X-rays. The correct option is A.

A section of the electromagnetic radiation spectrum with wavelengths ranging from roughly 700 nanometers (nm) to one millimetre is known as infrared radiation (IR), or simply infrared (mm).

While shorter than radio waves, infrared waves are longer than visible light waves.

Infrared radiation has the ability to ease muscle tension and encourage local blood circulation.

Infrared radiation has been used in conventional medicine to treat conditions including autoimmune diseases and issues with wound healing in addition to relieving muscle pain and tension.

Infrared waves are shorter than radio waves but longer than visible light waves.

Thus, the correct option is A.

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