unit measure for time

Answer:

The nuclear division processes of mitosis and meiosis occur during cell division. During mitosis, body cells are divided, while during meiosis, s3x cells are divided. At mitosis, a cell divides once; at meiosis, it divides twice.

Explanation:

Answer: 105

Explanation:

Answer:

167.4

Explanation:

105+62.4

167.4 is the answer

4 signficant digits

Answer: \(0.0039\ A\)

Explanation:

Given

Diameter of the rod \(d=2.54\ cm\)

length of rod is \(l=20\ cm\)

Resistivity of silicon is \(\rho=6.4\times 10^2\ \Omega-m\)

cross-section of the rod \(A\)

\(\Rightarrow A=\dfrac{\pi d^2}{4}\\\\\Rightarrow A=\dfrac{3.142\times 2.54^2\times 10^{-4}}{4}\\\\\Rightarrow A=5.067\times 10^{-4}\ m^2\)

Resistance of rod is  R

\(\Rightarrow R=\dfrac{\rho l}{A}\)

\(\Rightarrow R=\dfrac{640\times 0.20}{5.067\times 10^{-4}}\\\\\Rightarrow R=25.26\times 10^4\ \Omega\)

Current is given by

\(\Rightarrow I=\dfrac{V}{R}\\\\\Rightarrow I=\dfrac{1000}{25.26\times 10^4}\\\\\Rightarrow I=0.0039\ A\)

Answer: The given statement is True

Explanation:

A uniform motion is defined as the motion where an object is moving at a constant speed.

A non-uniform motion is defined as the motion where an object keeps changing its position and does not move at a constant speed.

We are given:

A car takes a full round of journey in a roundabout with constant speed

As the speed remains constant in a circular path, it is considered a uniform motion.

Hence, the given statement is True

Answer:

option 4

Explanation:

Light's velocity in air ( 3 × 10^8 m/s ) is much greater than sound's velocity in air ( 343 m/s )

Hence due to difference in velocities , during lightning light is seen first & sound is heard later

The choose C. 1.33

Tanθ =opposite / adjacent

Tanθ =20/15

Tanθ =1.33

I hope I helped you^_^

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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The activity of 1.0 g of 226Ra is approximately 2.19 x \(10^4\) Bq.

Activity = decay constant x number of atoms

The decay constant of 226Ra is:

decay constant = ln(2) / half-life = ln(2) / (1600 years x 365.25 days/year x 24 hours/day x 3600 seconds/hour) ≈ 4.95 x \(10^{-12} s^{-1\)

The number of atoms in 1.0 g of 226Ra is:

number of atoms = mass / molar mass = 1.0 g / 226 g/mol = 4.42 x \(10^{-3\)mol

Multiplying the decay constant and the number of atoms, we get:

Activity = decay constant x number of atoms = (4.95 x \(10^{-12} s^{-1\)) x (4.42 x \(10^{-3\) mol) ≈ 2.19 x \(10^4\) Bq

The decay constant is a measure of the probability of a radioactive atom decaying per unit of time. It is a fundamental concept used to describe the behavior of radioactive decay and is denoted by the symbol λ (lambda). The decay constant is related to the half-life of a radioactive material, which is the time required for half of the material to decay.

The decay constant is determined by the type of radioactive decay, as each type of decay has a unique probability of occurring. For example, the decay constant for alpha decay is typically much higher than that of beta decay. The decay constant can be calculated using the activity of the radioactive material, which is the rate at which it emits radiation. The decay constant is a critical parameter in the prediction of the behavior of radioactive materials and their potential impact on the environment.

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Answer:

Explanation:

Total distance covered  = 25 + 15 = 40 m

Total time = 15 + 8 = 23 s

Average speed = total distance covered / total time

= 40 / 23

= 1.74 m / s

Total displacement = 25 - 15 = 10 m

Total time = 15 + 8 = 23 s

Average velocity = total displacement / total time

= 10 / 23

= .434 m / s to the right .

The average speed of the student is approximately 1.74 m/s, and the average velocity is approximately -1.74 m/s (to the left).

Given:

Distance to the right = 25 m

Time taken to the right = 15 s

Distance to the left = 15 m

Time is taken to the left = 8.0 s

To calculate the average speed and average velocity, we need to use the following formulas:

Average speed = Total distance traveled ÷ Total time taken

Average velocity = Displacement ÷ Total time taken

Calculate the total distance traveled:

Total distance = Distance to the right + Distance to the left

Total distance = 25 + 15 = 40 m

Calculate the total time taken:

Total time = Time taken to the right + Time taken to the left

Total time = 15 + 8.0 = 23 s

Calculate the average speed:

Average speed = Total distance ÷ Total time

Average speed = 40 ÷ 23 = 1.74 m/s

Calculate the displacement:

Displacement = Final position - Initial position

Displacement = (-15 ) - 25  = -40 m

Calculate the average velocity:

Average velocity = Displacement ÷ Total time

Average velocity = -40 ÷ 23  ≈ -1.74 m/s

So, the average speed of the student is approximately 1.74 m/s, and the average velocity is approximately -1.74 m/s (to the left). The negative sign in the average velocity indicates that the student's net direction is to the left.

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Answer:

...................

Explanation:

Therefore, d = (v0/3)√(r/g), where d is the distance in terms of r.

Distance is a scalar quantity as a result. The entire journey that an object has taken can be used to define distance. An illustration. If an automobile drives 5 km east, then turns and drives 8 km further north, the total distance driven by the car is 13 km.

Using the motion's vertical component:

v² = u² + 2as

0 = (v0/2)² - 2gr/2

r = v0²/8g

v² = u² + 2gh

v²= 2gh

v = √(2gh) = √(2gr)

The momentum of the shell before the explosion was:

p = mv0

After the explosion, the momentum of the smaller piece is:

p1 = 15mv

The momentum of the larger piece can be found using conservation of momentum:

p2 = (45m)(-v) = -45mv

p1 + p2 = p

15mv - 45mv = mv0

v = v0/3

Therefore, the larger piece lands a distance d from the mortar:

d = vt = (v0/3)t

The time it takes for the smaller piece to land can be found using:

t = √(2h/g) = √(r/g)

Therefore, the distance d in terms of r is:

d = (v0/3)√(r/g).

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Answer: 80 blocks

Explanation:

Volume of freezer compartment, V1 = (40 X 40 X 20) cm^3

                                                            = 32000cm^3

Volume of ice cream block, V2 = (10 X 10 X 4) = 400 cm^3

No of ice cream blocks = V1/V2 = 32000/400 = 80

When you push a merry-go-round to the left, the angular momentum of the merry-go-round will remain constant is the statement that best describes the angular momentum of the merry-go-round.

Angular momentum is the amount of force an object has when it spins or rotates around an axis. Angular momentum is calculated by multiplying the mass of the object, the distance between the center of mass and the axis of rotation, and the velocity of the rotation.The merry-go-round's angular momentum remains constant because it is an isolated system that is rotating at a constant velocity. When you push the merry-go-round to the left, it will still rotate at the same rate because the angular momentum is conserved. The conservation of angular momentum states that the angular momentum of an object will remain constant as long as no external forces are applied to it. Therefore, the angular momentum of the merry-go-round will remain constant when you push it to the left.

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Answer:

I believe D

Explanation:

Of course the manufacturer would most likely be biased to the product the have created, but the other sources would have no reason to. Hope this helps!

The thing that can be said is that there are presently no stars with 8 planets but this can probably still occur in the future.

The Solar System is composed of the Sun and the objects that orbit it. It was created by the gravitational collapse of a massive interstellar molecular cloud 4.6 billion years ago. The Sun contains the vast majority of the system's mass, with Jupiter holding the majority of the remaining mass.

Even though planets were only discovered in 1995, we can't yet find planets that take centuries to orbit their star, but we do know of other stars with 8 planets and expect to find more.

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Trees are being felled at an alarming rate by people. Forests are home to numerous animals and people, and by removing trees from them, we are destroying their habitat and depriving them of a safe haven.

Community conservation refers to a strategy for protecting the environment that acknowledges local residents' rights to manage wildlife or gain both direct and indirect benefits from it.

The gorillas' habitat, the forest, is being destroyed by humans. Additionally, people are harming these creatures, and if this continues, gorillas may become extinct.

There won't be as many resources from trees, like paper, if people cut down less of them, therefore prices could rise.

Prices for tourists will increase if fewer gorillas are still alive. That won't benefit visitors since they will have to pay more, and since some individuals don't have a lot of money, there will be fewer visitors.

Thus, this way, community conservation is mandatory.

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To find the height of the balloon, we can use trigonometry and the concept of similar triangles. Let's denote the height of the balloon as "h" and the horizontal distance from the balloon to the landmark as "x".

We have two right triangles: one before flying 100 feet and another after flying 100 feet. In both triangles, the angle of depression to the lake is given as 54 degrees and 61 degrees, respectively.

Using the tangent function, we can set up the following equations:

Before flying:

tan(54°) = h / x

After flying:

tan(61°) = h / (x + 100)

Now we can solve these equations to find the value of "h". Let's solve for "x" in the first equation:

x = h / tan(54°)

Substituting this value into the second equation, we have:

tan(61°) = h / ((h / tan(54°)) + 100)

Now we can solve this equation to find the value of "h".

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Answer:

The answer to this question is given below in this explanation section.

Explanation:

                     " law of conservation of energy"

The law of conservation of energy states that energy can neither be created nor destroyed only converted from one form of energy into another.This mean that a system always has a same account of a energy,unless it is added from the outside.This is particularly confusing in the case of non conversation forces,where energy is converted from ,mechanical energy into thermal energy.but the overall energy does remain the same.The only way to use energy is to transform energy from one form to another.

The amount of energy in any system than it is determined by the following equation.

Ut=Ui +W+Q

It is also possible to determined the change in internal energy of the system using the equation.

ΔU=W+Q

The mechanical energy of a system increases provided their is no loss of energy due to friction.The energy would transform to kinetic energy when the speed is increasing.Te mechanical energy of a system remain constant provided their is no loss of energy due to friction.

The law of conversation of energy which say that in a closed system total energy is conserved that is it constant.

KE1 + PE1=KE2+PE2

The angle (p) at which there is no magnetic flux through the 8.8-m length of conducting wire formed into a square and placed in a uniform magnetic field of strength 1.2T is 0 degrees.

To find the angle p at which there is no magnetic flux through the conductor, we need to use the formula for magnetic flux through a surface:

Φ = B × A × cos(θ)

where Φ is the magnetic flux, B is the magnetic field strength, A is the area of the surface, and θ is the angle between the normal line to the surface and the magnetic field.

In this case, the conducting wire is formed into a square, so its area is A = (8.8 m)² = 77.44 m². The magnetic field strength is given as B = 1.2 T.

As the square is rotated continuously in three dimensions, the angle θ varies between 0 degrees and 90 degrees. We want to find the angle p at which there is no magnetic flux, which means Φ = 0.

Substituting the values into the formula, we get:

0 = (1.2 T) × (77.44 m²) × cos(p)

Solving for p, we get:

cos(p) = 0

Since the cosine of 0 degrees is 1, and the cosine of 90 degrees is 0, we know that the angle p must be 90 degrees for there to be no magnetic flux through the conductor. At this angle, the normal line to the square is perpendicular to the magnetic field, so the magnetic flux through the surface is zero.

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Answer:

calculate the mass of mass A i the diagram .the frame joining the mass is massless

Explanation:

The mass of mass A the diagram .the frame joining the mass is massless.

The unique location in an object or system that can be used to describe how the system reacts to outside forces and torques is referred to as the "center of mass" or "center of gravity" in a uniform gravity field.

The idea of the center of mass is that it is the average of all the masses divided by the distances between them. With regard to the torques produced, that is comparable to balancing a seesaw around a pivot point in one plane.

Therefore, The mass of mass A the diagram .the frame joining the mass is massless.

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The statement that correctly describes the classification of chemical reactions into different categories is "All reactions fit into a category, and some reactions can fit into more than one category."

A chemical reaction is said to have occurred when the substances combine and form new substances. The substances that combined together are called reactant while the substance produced by such combination is called a product.

All reactions can be fitted into one category of the other depending on the kind of change that occur in the reaction.

However, some reactions fit more than one category. Let me give you an example. Look at the reaction; C(s) + O2 (g) ------> CO2(g).

This reaction can be viewed as a redox reaction since the oxidation numbers of the species involved in the reaction changed from left to right. On the other, we can also look at the reaction as a combustion reaction since it involves burning carbon in oxygen.

From this little example, we have seen that some reactions can fit into more than one category of reaction, hence the answer .

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Answer:

measured at constant temperature and pressure

Hope this helps :)

For the first circuit, the current through resistor R1 is 0.31 A and the voltage across it is 15.5 V; for resistor R2, it’s 0.31 A and 7.75 V; for resistor R3, it’s 2.69 A and 23 V.

In the first circuit, resistors R1 and R2 are in series with each other and in parallel with resistor R3. In the second circuit, resistors R1 and R3 are in series with each other and in parallel with resistor R2.

To find the current through each resistor, we can use Ohm’s law which states that voltage is equal to current times resistance (V = IR). We know that the voltage across all three resistors is 23 V. We can use this information along with the resistance values of each resistor to find the current through each one.

For the first circuit, we can find the equivalent resistance of resistors R1 and R2 in series by adding them together:

R1 + R2 = 50 + 25

= 75 Ω.

We can then find the total resistance of the circuit by adding this value to resistor R3 in parallel:

1/Rt = 1/75 + 1/10;

Rt = 8.57 Ω.

Using Ohm’s law, we can find the current through resistor R1:

I = V/R

= 23/75

= 0.31 A,

resistor R2:

I = V/R

= 23/75

= 0.31 A,

and resistor R3

I = V/R

= 23/8.57

= 2.69 A.

For the second circuit, we can find the equivalent resistance of resistors R1 and R3 in series by adding them together:

R1 + R3 = 50 + 10

= 60 Ω.

We can then find the total resistance of the circuit by adding this value to resistor R2 in parallel:

1/Rt = 1/60 + 1/25

Rt = 18 Ω.

Using Ohm’s law, we can find the current through resistor R1:

I = V/R

= 23/60

= 0.38 A,

resistor R2:

I = V/R

= 23/18

= 1.28 A,

and resistor R3

I = V/R

= 23/60

= 0.38 A.

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Answer:

Density= 2.78 g/cm³

Relative density=2.8

Explanation:

To calculate the density of the cube we have to use the formula ρ=mass/volume

ρ stands for density.

So now we don't have the volume of the cube and to find the volume of the cube we have to use the formula a³

3³= 9 cm³

Now plug in the values. ρ= 25 g/9 cm³

ρ= 2.78 g/cm³

To find the relative density, we have to use the formula ρsample/ρH20

The sample means the density of the substance earlier. We do not know the density of water but it is constant at 997 kg/m³.

Now we have to make the units same so you change the unit of the density of cube to kg/m³

So, 25/1000= 0.025 kg

9/100×100×100 (because cm³ which means that there should be 3 meters to change the unit and to conver cm to meter we need to divide by 100 so 9cm/100, 9cm²/100×100, 9cm³/100×100×100)

=0.000009 m³

The new density= 0.025 kg/ 0.000009 m³

= 2777.78 kg/m³

Now plug the values into the formula:

relative density= 2.777.78 kg/m³ / 997 kg/m³

=2.8

There is no unit since kg/m³ and kg/m³ cancels

To solve this problem, we can use the principle of conservation of energy, which states that the initial potential energy of the yo-yo is converted into kinetic energy as it rolls down the string.

(a) The magnitude of the linear acceleration can be found using the formula:

a = g(sinθ - μcosθ)

where g is the acceleration due to gravity, θ is the angle the string makes with the vertical, and μ is the coefficient of kinetic friction. Since the yo-yo is rolling without slipping, we can use the relationship between linear and angular acceleration:

a = Rα

where R is the radius of the yo-yo and α is its angular acceleration. Combining these equations, we get:

α = g/R(sinθ - μcosθ)

The moment of inertia of the yo-yo about its center is:

I = 1/2MR^2 + 1/4mR^2

where M is the mass of the yo-yo and m is the mass of the string. Substituting the given values, we get:

I = 0.0024 kg·m^2

The torque acting on the yo-yo due to the tension in the string is:

τ = Iα

At the bottom of the string, the tension in the string is equal to the weight of the yo-yo, so we have:

τ = (1/2)mgR

Setting these two expressions for τ equal to each other and solving for α, we get:

α = (1/2)mgR/I = 51.5 rad/s^2

Finally, we can use the relationship between linear and angular acceleration to find the magnitude of the linear acceleration:

a = Rα = 164.8 m/s^2

(b) The time it takes for the yo-yo to reach the end of the string can be found using the kinematic equation:

y = (1/2)at^2

where y is the length of the string and a is the linear acceleration. Substituting the given values, we get:

t = sqrt(2y/a) = 2.12 s

(c) At the end of the string, the linear speed of the yo-yo is equal to the product of its radius and angular velocity:

v = ωR

The final angular velocity can be found using the kinematic equation:

θ = ωi t + (1/2)αt^2

where θ is the angle through which the yo-yo rotates, ωi is its initial angular velocity (zero), and α is its angular acceleration. The angle θ is equal to the length of the string, so we have:

θ = 2π = ωf t + (1/2)αt^2

Solving for ωf, we get:

ωf = (2π - (1/2)αt^2)/t = 45.5 rad/s

Substituting this value into the equation for linear speed, we get:

v = ωfR = 145.6 cm/s

(d) The translational kinetic energy of the yo-yo at the end of the string is:

K = (1/2)mv^2 = 0.052 J

where m is the mass of the yo-yo. The rotational kinetic energy is:

K' = (1/2)Iω^2 = 0.163 J

The total kinetic energy is the sum of these two terms:

Ktotal = K + K' = 0.215 J

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Answer:

70mi/h

1mile =1609 meters

1hour=3600 seconds

So,

70×1609/3600

112,630/3600

31.286 m/s

Hope this helps you

Answer:

The quadratic function models the path of the rocket. When we substitute an x value, we can determine the height in feet of the rocket.

To determine the height it was launched from, we would look at the y-intercept. This represents the starting value, as time = 0 in this point (cannot have negative time).

To determine how far the rocket traveled, we would look at the positive x-intercept of the expression. At this point, height = 0, so we can see the distance from start to finish of the rocket.

To determine the greatest height achieve, we would look at the vertex of the parabola generated from the given function. Using (-b/a, f(-b/a)), we can determine the greatest height achieved.