When did stromatolites appear on Earth?

A. Hadean
B. Mesozoic
C. Archean

Answer: He was labeled as one of Africa's cruelest dictators because during his eight year reign many civilians were massacred. He drove out Uganda's Indian and Pakistani citizens and spent large amount of money on the military which led to the economic decline of the country.

Explanation:

The percent change frοm the first drοp tο the secοnd drοp is apprοximately 16%.

A value is a numerical οr qualitative measure οf the wοrth, merit, significance, οr usefulness οf a thing οr idea. It can refer tο the mοnetary wοrth οf a physical οbject, such as a car οr a piece οf prοperty, οr tο the impοrtance οr usefulness οf an idea, such as a scientific theοry οr a philοsοphical cοncept.

In mathematics, a value refers tο the specific quantity οr numerical οutput οbtained frοm a functiοn οr equatiοn. The cοncept οf value is οften subjective, as different peοple οr grοups may assign different levels οf wοrth οr impοrtance tο the same οbject οr idea based οn their individual perspectives, experiences, and beliefs.

The change frοm the first drοp tο the secοnd drοp can be calculated by subtracting the first drοp height frοm the secοnd drοp height:

4.3 ft - 3.7 ft = 0.6 ft

The percent οf change frοm the first drοp tο the secοnd drοp can be calculated using the fοllοwing fοrmula:

percent change = (|new value - οld value| / οld value) x 100%

where | | denοtes absοlute value. In this case, the οld value is the first drοp height and the new value is the secοnd drοp height.

Substituting the values, we get:

percent change = (|4.3 ft - 3.7 ft| / 3.7 ft) x 100%

percent change = (0.6 ft / 3.7 ft) x 100%

percent change = 16.22%

Therefοre, the percent οf change frοm the first drοp tο the secοnd drοp is apprοximately 16%.

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A body is said to be in thermal equilibrium where all the system temperatures are the same.

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Although the forces are equal and opposite, the acceleration is greater since the cannonball's mass is much lower.

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Answer:

Explanation:

Use simplified formula:

Answer:

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Explanation:

Inches of mercury is ideal for vacuum lifting with vacuum cups, as the amount of vacuum required is rarely high. Typical vacuum handling utilizes anything between 15″Hg and 25″Hg. Therefore, “Hg is suitable as a measurement of system performance in this type of operation

The column of mercury employed in a mercury barometer, the height of which (inches of mercury) is used as a measure of atmospheric pressure.

At some point, all water vapour that is found in a vacuum system came from the atmosphere. Consider that air at 25° C and 50% relative humidity contains 12 torrs of water vapour. ... Additionally, any surface will adsorb a certain number of monolayers of water molecules.

Credits:

Vacuum Measurement: A Basic Guide - Fluid Power Journal

Sources of Water Vapor in Vacuum Systems | Normandale ...

Answer:

1.2×10⁶ Hz

Explanation:

Applying,

v = λf............. Equation 1

Where v = speed of wave, λ = wavelength, f = frequency.

make f the subject of the equation

f = v/λ............... Equation 2

From the question,

Given: v = 3.0×10⁸ m/s, λ = 2.5×10² m

Substitute these values into equation 2

f =  3.0×10⁸/2.5×10²

f = 1.2×10⁶ Hz

When Betty catches up with Alice, Betty will be younger than Alice by Δt = 0.87 - 0.44 = 0.43 years.
ii) Alice is older than Betty when they meet.

According to the theory of relativity, time dilation occurs when an object moves at high speeds. Therefore, Alice's time will slow down due to her spaceship's high speed of 0.5c, while Betty's time will slow down even more due to her spaceship's higher speed of 0.9c.
i) When Betty catches up with Alice, Betty's clock will have ticked less than Alice's clock. The time difference can be calculated using the equation:
Δt = γΔt₀, where Δt₀ is the time difference measured by a stationary observer, and γ is the Lorentz factor given by γ = 1/√(1 - v²/c²), where v is the relative speed between the two spaceships, and c is the speed of light.
Assuming Alice and Betty are both 20 years old when they leave Earth, and using the Lorentz factor equation, we get:
- Δt for Alice = γΔt₀ = √(1 - 0.5²)/0.866 x 1 year = 0.87 years
- Δt for Betty = γΔt₀ = √(1 - 0.9²)/0.436 x 1 year = 0.44 years
Therefore, when Betty catches up with Alice, Betty will be younger than Alice by Δt = 0.87 - 0.44 = 0.43 years.
ii) Alice is older than Betty when they meet.

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The motion when she is running directly east is Δx = 11.7 and Δy = 15.

To determine the slope of a line select two points on the line and calculate the delta y change in y value to determine the change in elevation. Divide the change in x value by the delta x to determine the change in width. The derivative of y is the square of x with respect to y.

So the derivative of something squared with respect to something is multiplied by the derivative of that thing with respect to x. That's exactly the chain rule. Yes, it means exactly the same. y in Newton notation and dy/dx in Leibniz notation. Newton and Leibniz independently invented calculus at about the same time, so in this case, they used different notations to express the same rate of change.

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Answer:

\(\boxed{ V_{2}= 0.03189 m^3}\)

Explanation:

According to Charles Law

=> \(\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}\)

Where \(V_{1}\) = 0.0279 m³, \(T_{1}\) = 280 K and \(T_{2}\) = 320 K

=> \(\frac{0.0279}{280} = \frac{V_{2}}{320}\)

=> \(V_{2}\) = 0.03189 m³

Hi there!

Recall the following:

\(C = \frac{Q}{V}\)

C = Capacitance (F)
Q = Charge (C)
V = Potential difference (V)

The equation for the capacitance of a parallel-plate capacitor:

\(C = \frac{\epsilon_0 A}{d}\)

C = Capacitance (F)
ε₀ = Permittivity of Free Space

A = Area of plates (m²)
d = distance between plates (m)

If the distance is halved, the capacitance will DOUBLE since there is an inverse relationship between capacitance and distance.

Thus, something has to change in regards to the charge or voltage for it to match the doubled capacitance.

Since the capacitor is ISOLATED, it is not connected to a battery, so the voltage is NOT maintained constant. The VOLTAGE will consequentially be changed, while the electric field will be unchanged.

Recall the equation for potential difference:

\(V = Ed\)

If the distance is halved, the voltage will be halved. This is mirrored by the doubled capacitance. Thus, the electric field will remain the SAME.

Label the rows as the electron energy levels:

The rows of the periodic table are also known as periods. There are seven periods, and each period corresponds to a particular energy level. You can label them from 1 to 7, starting from the top row.

Label the number of valence electrons in Columns 1, 2, and 13-18:

Columns 1 and 2 are the s-block elements, and they have 1 and 2 valence electrons, respectively. Columns 13-18 are the p-block elements, and they have 3 to 8 valence electrons, respectively. You can label the number of valence electrons in each column.

Label the metals, semi-metals, and non-metals using different colors:

Metals are on the left side of the periodic table, semi-metals are in the middle, and non-metals are on the right side. You can use different colors to label them without obscuring any of the information about different elements.

Label the ion charges for elements in the first 3 rows:

Elements in the first 3 rows of the periodic table have predictable ion charges. The alkali metals (Group 1) have a charge of +1, the alkaline earth metals (Group 2) have a charge of +2, and the elements in Group 13 have a charge of +3. For Groups 15, 16, and 17, the charges are -3, -2, and -1, respectively. The noble gases (Group 18) are unreactive and do not form ions. You can write these charges for each element in their respective positions.

Label the trends for atomic size, ionization energy, and electron affinity:

Atomic size generally decreases from left to right across a period and increases from top to bottom within a group. Ionization energy generally increases from left to right across a period and increases from bottom to top within a group. Electron affinity generally increases from left to right across a period and becomes less negative from top to bottom within a group. You can label these trends on your periodic table as well.

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The rough endoplasmic reticulum in an animal cell is labeled as option B) 5.

The rough endoplasmic reticulum (ER) is an organelle involved in protein synthesis and modification. It appears rough because it is studded with ribosomes on its surface. These ribosomes are responsible for producing proteins.

The rough ER plays a crucial role in the production of membrane proteins and proteins that are secreted from the cell. As proteins are synthesized by the ribosomes, they enter the lumen or interior of the rough ER, where they undergo folding and modification. This ensures that the proteins are properly shaped and functional.

Once the proteins are correctly folded, they can be transported to other parts of the cell or exported outside of the cell. The rough ER is connected to the smooth endoplasmic reticulum, which lacks ribosomes and is involved in lipid metabolism and detoxification.

In summary, the rough endoplasmic reticulum is labeled as option B) 5. It is involved in protein synthesis and modification, and its rough appearance is due to the presence of ribosomes on its surface.

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The activity of the source in Becquerel is 333.3Bq

The number of nuclei that disintegrate or decay per unit time is known as Activity.

Given that a sample of radioactive material emits 400000 particles over a period of 20 minutes.

Activity A = dN/dt

A = 400000 / 1200

A = 333.3 particles / s

A = 333.3 Bq

Therefore,

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The thermometer measures the starting temperature as,

The temperature required for the boiling the water is

(a). The temperature requires to boil is,

Answer:

False

True

False

True

False

True

Explanation:

Answer:

it fast is = 25 + 34 = 59j that is the fast of the object

Answer:

Since the two colliding objects travel together in the same direction after the collision, the total momentum is simply the total mass of the objects multiplied by their velocity.

Explanation:

Answer: Reflecting telescopes focus light with a series of mirrors, while refracting telescopes use lenses.

Explanation:

Explanation:

work done is expressed as:

w=fd

where did force and d is distance

w=30*10

=300J

w is said to be done when a load is moved at a distance.

6C

The quantity of charge, Q, passing through an electric circuit is dependent on the electric current, I, and the time taken, t, for the current to flow. It is given mathematically as follows

Q = I x t          ------------------------------(i)

Where;

I is measured in Amperes(A)

t is measured in seconds (s)

Q is measure in coulombs (C)

From the question,

I = 3A

t = 2s

Substitute these values into equation (i) as follows;

Q = 3 x 2

Q = 6C

Therefore, the number of coulombs of charge that will pass is 6C

The density of mercury at 100 °C, given that the density of mercury is 13.6 gcm⁻³ at 0 °C, is 13.4 g/cm³

First, we shall obtain the new volume of the mercury. Details below:

Density at 0 °C (d₁) = 13.6 gcm⁻³

V₂ = V₁ ( 1 + αΔT)

= 1 × [1 + (1.8×10⁻⁴ × 100)]

= 1 × [1 + 0.018]

= 1.018 cm³

Finally, we shall obtain the density at 100°C. Details below:

Density at 100 °C = mass / new volume

= 13.6 / 1.018

= 13.4 g/cm³

Thus, the density of mercury at at 100 °C is 13.4 g/cm³

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Complete question:

What is the density of mercury at 100°C if that at 0°C is 13.6 gcm⁻³ and coefficient of cubic expansion of Mercury 1.8×10⁻⁴ K⁻¹​

The range at which an object can be seen clearly is referred to as the far range of the eye. The closest object can be seen clearly and without strain at the eye's near point, which is also the shortest distant object.

A myopic eye's far point is immediately anterior to a corneal plane. As they reach the eye, the rays coming from this point are still highly divergent. Rays coming from the far spot end up highly concentrated at the retina because this divergence balances out the excessive converge that is integrated into the myopic eye.

The myopic person's (u) far point is 40 cm away. Final thought The place to start for the this question is 40 cm from the viewer and is a case of myopia. Therefore, the lens's focal length will be -40cm, or -0.4m.

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Answer:

Visible light sits in the region with ultraviolet (UV) to the left of the spectrum and infrared (IR) to the right. It is a form of electromagnetic radiation which can be subdivided into seven colors. It's probably the most familiar to you because it is the only region on the spectrum that is visible to most human eyes.

Answer:

0.006kg

Explanation:

bdjdndjoskdn dhend

Question: A negative 6 mC charge enters a region of 45 T magnetic field that is directed up. If the charge is moving toward the south with a speed of 400 m/s. determine the magnitude and  direction of the force

Answer:

Magitude of F = 108 N

Direction: Perpendicular to the plane containing v and B.

Explanation:

From the question,

Since the velocity of the charge(v), is parallel to the field(B).

Therefore, We apply

F = qvB..................Equation 1

Where F = Force, B = magnetic field, v = velocity, q = Charge.

Given: q = 6 mC = 0.006 C, v = 400 m/s, B = 45 T

Substitute these values into equation 1

F = 0.006×400×45

F = 108 N.

The direction of the force is always perpendicular to the plane containing v and B.

Answer:

It counts as a learning experience

Explanation:

He can learn from his mistakes and take important steps to achieve his goal In the future.

Setting objectives can lead to better direction, enhanced attention, higher levels of motivation, and increased productivity. You may change your behaviours, mindset, confidence, and daily activities by setting clear, measurable goals.

More essential than monetary or material rewards is achievement. Greater personal satisfaction comes from completing the task or reaching the goal than from being praised or recognized.

Additionally, crucial is commitment. It is less probable that you will succeed if you don't give your aim your all. This enables you to change your future expectations and strategy.Feedback enables you to discover your strengths and weaknesses.

Therefore, people who are driven by achievement are always looking for methods to do things better.

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the set-up integral for the volume V cut out is:

V_cut out = ∫_0^h (π(7r)² - π(9R)²) the set-up integral for the volume V cut out is:

V_cut out = ∫_0^h (π(7r)² - π(9R)²) dh

How can we obtain the volume V cut out?

To set up an integral for the volume V cut out when a hole of radius 7r is bored through the middle of a cylinder of radius 9R > 7r at right angles to the axis of the cylinder, we will use the principle of volumes of solids of revolution. We will assume that the cylinder and the bored hole are both of the same height 'h'.

The volume of the cylinder can be found using the formula of the volume of a cylinder:

V_cylinder = πr²h

Where r is the radius of the cylinder.

Volume of the cylinder is given as;

V_cylinder = π (9R)² h

We are given that a hole of radius 7r is bored through the middle of the cylinder. The volume of the hole can be found by taking the difference between the volumes of two cylinders; one with radius 7r and height h and the other with radius 9R and height h. The volume of the hole can be found using the formula;

V_hole = πr²h - πr²h

Where r is the radius of the hole (7r) and h is the height of the cylinder. The radius of the cylinder is 9R. Therefore, the volume of the hole is given as;

V_hole = π(7r)²h - π(9R)²h

We can now set up the integral for the volume V cut out using the formula;

V_cut out = ∫_0^h (π(7r)² - π(9R)²) dh

By evaluating this integral, we can obtain the volume V cut out. Therefore, the set-up integral for the volume V cut out is:

V_cut out = ∫_0^h (π(7r)² - π(9R)²) dh

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