what is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?

Explanation:

Sound is a mechanical wave. Electromagnetic wave is a by-product of both electric and magnetic fields. It does not require the presence of any medium and can travel through a vacuum. In comparison, mechanical waves require the presence of a medium. It works by pushing the medium's molecules and traveling through it. Sound works this way.

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Answer:

Highly doubt something that requires great focus and mental strength exists

Answer:

I am not sure if this is the answer

(B) what is the height of the building if it hits the ground after those 5 seconds.

Answer:

A resistor is a battery

Answer:

The answer is A

Explanation:

A resistor is a light bulb because it is the flow of an electric current in an electric circuit.

The individual effect of salinity reduced organism performance in 43% of the observations, including decreased survival and growth, increased osmolyte content in bodily fluids, altered metabolic rates, etc.

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When the arrow is in the air, the gravitational force acts on its center of gravity, and rotates it about the axis of rotation. The gravitational force in this case provides the centripetal force to the arrow which allows it to curve in a parabolic path.

It is important to note that action of gravitation force is such that the arrow always remains tangent to its flight path.

Some examples of the force of gravity include: The force that holds the gases in the sun. The force that causes a ball you throw in the air to come down again. The force that causes a car to coast downhill even when you aren't stepping on the gas. The force that causes a glass you drop to fall to the floor.

The gravitational force on Earth is equal to the force the Earth exerts on you.

At rest, on or near the surface of the Earth, the gravitational force equals your weight.

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Answer:

lol can u tell what to help u with. cause I didn't understood

Hydrostatic pressure is the pressure exerted by an incompressible fluid (a liquid) at a given point, due to the weight of the fluid above it. Atmospheric pressure is the pressure exerted on a surface by the weight of the atmosphere (a compressible fluid) above it.

836 torr converted to atmospheres is approximately equal to 1.1 atmospheres.

To do this, we'll use the conversion factor between torr and atmospheres:

1 atmosphere (atm) = 760 torr

1. Write down the given value: 836 torr
2. Apply the conversion factor: 1 atm = 760 torr
3. Set up a conversion equation: (836 torr) × (1 atm / 760 torr)
4. Notice that the "torr" units cancel out: (836 * 1 atm) / 760
5. Perform the calculation: 836 / 760 ≈ 1.1 atm

So, 836 torr is approximately equal to 1.1 atmospheres.

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The moment of inertia about the rotation axis for the given playground toy, with two children sitting opposite each other, is approximately 145.35 kg·m².

To determine the moment of inertia about the rotation axis for the given playground toy, we need to consider the contributions from the seats and the two children.

Given:

Mass of each seat = 6.4 kg

Length of the rods (r) = 1.5 m

Mass of the first child (m₁)= 16 kg

Mass of the second child (m₂) = 23 kg

The moment of inertia of each seat can be calculated using the formula for the moment of inertia of a point mass about an axis:

\(I_{seat} = m_{seat times} r^2\)

For each seat, the moment of inertia is:

\(I_{seat} = 6.4 kg times (1.5 m)^2= 14.4 kg\cdot m^2\)

Now, to calculate the moment of inertia contributed by the children, we need to consider that the children are located opposite each other. Assuming the axis of rotation passes through the center of mass of the children-seats system, the moment of inertia for each child is:

\(I_{child} = m_{child times} r^2\)

For the first child (m₁):

\(I_1 = 16 kg times (1.5 m)^2 = 36 kgm^2\)

For the second child (m₂):

\(I_2 = 23 kg times (1.5 m)^2 = 51.75 kgm^2\)

Finally, we can calculate the total moment of inertia by summing the contributions from the seats and the children:

Total moment of inertia =\(4 times I_{seat} + I_1 + I_2\)

= \(4 times (14.4 kgm^2) + 36 kgm^2 + 51.75 kgm^2\)

= \(57.6 kgm^2 + 36 kgm^2 + 51.75 kgm^2\)

= \(145.35 kgm^2\)

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The dew point for the products of combustion is 52.9 °C.

(a) In practical fuel burners, air in excess of that theoretically required for complete combustion is needed to ensure that combustion is complete and that products of combustion are safe to discharge into the environment. The excess air provides additional oxygen that is used to complete the combustion of any combustibles that were not burned during the initial combustion process. The effect of excess air on the combustion process is that it lowers the temperature of the flame and reduces the concentration of pollutants in the flue gas.

(b) The complete combustion equation is: C10H22 + (32 + 11.5 × 2)O2 → 10CO2 + 11H2O

For complete combustion, the volume percentage of CO2 and O2 in the dry products of combustion is 8% and 10% respectively. The air-fuel ratio by mass can be calculated as follows:

Air-fuel ratio by mass = Mass of air / Mass of fuel

Mass of air = Mass of fuel × (1 + Excess air) Mass of fuel = 1 kg

Excess air = 20% = 0.2Air-fuel ratio by mass = (1 + 0.2) / 1 = 1.2

The dew point for the products of combustion can be calculated as follows:

Dew point = (288.3 / (ln(P / 100) - 42.677)) - 273, where P is the exhaust gas pressure in Pa.

Dew point = (288.3 / (ln(101325 / 100) - 42.677)) - 273Dew point = 52.9 °C

Therefore, the dew point for the products of combustion is 52.9 °C.

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Answer:

Self control

Explanation:

Self control involves individuals having a strong discipline towards certain conditions. The conditions could be cravings for something or other forms of activities.

Self control is usually developed by people who practice self-regulation through physical exercise and time-managed programs experience as they have been known to bring about an increase in it.

Answer:

An object's velocity will only remain constant in the absence of any forces or if the forces ... The pendulum doesn't move because all the forces cancel each other out (add ... Note that an object that has a mass of one kilogram on earth would have a ... frames of animation

Explanation:

Answer:

Disk will reach the floor last because it can spend time in the air

The velocity of both objetcs after the collision is 3.07m/sec if both object masses are 6.2 kg and 8.0kg respectively.

To find the velocity of both objects we need to conserve the momentum. We need to follow the law of conservation of momentum which states that initial momentum is equal to final momentum.

Now, we know that momentum =mass × velocity

So, initial momentum of first object=6.2×3=18.6Kg-m/sec

Similarly, initial momentum of second object=8×3.5=28.0kg-m/sec

Now, it is given that both object stick together, so total mass of both objects are=(6.2+8)=14.2kg

Now, both objects are moving with common velocity, so assume both have velocity v

=>So, final momentum of both objects is =14.2×v

according to law of conservation of momentum

=>18.6+25=14.2v

=>43.6=14.2v

=>v=43.6/14.2

=>v=3.07m/sec

Hence, final velocity of objects are 3.07m/sec.

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From the information given,

diameter of ornament = 8

radius = diameter/2 = 8/2

radius of curvature, r = 4

Recall,

focal length, f = radius of curvature/2 = 4/2

f = 2

Recall,

magnification = image d

Answer:

the answer is B

Explanation:

because i had this question in 8th grade

The new electrostatic force will be 384 units.  

The electrostatic force of attraction between two charges \(q_{1} \\\)(charge of object 1)  and \(q_{2}\)(charge of object 2) separated by a distance d is given by

\(F = \frac{q_{1} q_{2}}{4\pi E_{0} d^{2} } \\\)

\(E_{0} = 8.854 * 10^{-12} C^{2} N^{-1} m^{-1}\) is the permittivity of free space.

Initially, we have,

\(\frac{q_{1} q_{2}}{4\pi E_{0} d^{2} } =F_{1} = 8 units\)  

Now, if the charge of object 1 is multiplied by 1, the charge of object 2 is multiplied by 3, and the distance separating objects 1 and 2 is divided by 4, we have, \(q_{1} =q_{1}, q_{2} =3q_{2} , d=\frac{d}{4}\).

The new electrostatic force will be,

\(F_{2} = \frac{q_{1} 3q_{2}}{4\pi E_{0} (\frac{d}{4} )^{2} } \\\\\) units.

We have, \(F_{1} = 8 units= \frac{q_{1} q_{2}}{4\pi E_{0} d^{2} } \\\)

Hence,

\(F_{2} =\frac{8*3}{(\frac{1}{4}) ^{2} } units= 384 units.\)

Hence, the new electrostatic force will be 384 units.

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Answer: Newton's third law of motion is naturally applied to collisions between two objects. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction.

Explanation: So it is #2

(a) a thin layer of vacuum is provided between the two walls of flask, to minimise the heat loss by conduction , because for conduction medium (molecules) is required , but now medium is absent .

.(b) the two walls are silvered to minimise the heat loss by radiation , because a shiny surface is a bad absorber and bad emitter of radiation i.e. good reflector of heat , so prevents the heat exchange between content of flask and surrounding .

(c) the lid of flask is provided with a tight cork stopper to minimise the heat loss by convection , so that convection currents cannot go out .

(d) a plastic (or metal) case is provided with a flask , to protect the flask from physical damage

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Answer:

π/10 rads

Explanation:

It takes an hour (60 minutes) for the minute's hand to turn a full circle or achieve an angular rotation of

2πl rad.

Now, number of periods of 3 minutes in an hour is;

Number of periods = 60/3 = 20 periods

Thus, 3 minutes rotation accounts for 1/20 of 2π the rotation of the minute's hand in an hour.

Thus;

Angular displacement = (1/20) * 2π = π/10 rads

Answer:

Yes, that is correct, although most velocity is calculated via m/s and therfore you would multiply your 3 hours by 60 twice. Much of the information given is irrelevant and just trying to confuse.

Explanation:

300 meters because 5x600=3000 and 3000÷10=300 please someone check me for this answer

By examining these factors, such as mean, variability, and bias, we can determine which student was better at estimating the mass of the objects.

To determine which student was better at estimating the mass of the objects, we need to compare the summary statistics of their estimates. Without specific summary statistics provided, we can consider the following factors:

1. Mean: Calculate the mean estimate for each student by summing up their estimates and dividing by the number of objects. Compare the mean estimates of Clare and Lin. The student with a mean estimate closer to the actual weight of 2,000 grams would be considered better at estimating the mass.

2. Variability: Consider the variability of the estimates for each student. Calculate the standard deviation or range of estimates for Clare and Lin. A smaller standard deviation or range indicates more consistent and accurate estimates, suggesting better estimation skills.

3. Bias: Check if there is any systematic bias in the estimates of either student. If one student consistently overestimates or underestimates the mass, it may indicate a tendency for inaccurate estimation.

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The acceleration of the textbook is a = F/m = 2.0 N/1.33 kg = 1.5 m/s². and the final velocity of the textbook is v = 0 + (1.5 m/s²)(0.75 s) = 1.125 m/s.

Acceleration is the rate at which an object changes its velocity over time. It is a vector quantity, meaning it has both magnitude and direction. An object's acceleration can be calculated by measuring the change in its velocity over time.

The net force acting on the textbook is the difference between the pushing force of 4.0 N and the frictional force of 2.0 N, which is 2.0 N.
According to Newton's Second Law, this net force of 2.0 N will cause an acceleration of the textbook given by the equation F = ma, where m is the mass of the textbook (1.33 kg) and a is the acceleration.
Therefore, the acceleration of the textbook is a = F/m = 2.0 N/1.33 kg = 1.5 m/s².

The final velocity of the textbook can then be calculated using the equation v = v0 + at, where v0 is the initial velocity (0 m/s, since the textbook was initially at rest), a is the acceleration (1.5 m/s²), and t is the time the textbook was pushed (0.75 m).
Therefore, the final velocity of the textbook is v = 0 + (1.5 m/s²)(0.75 s) = 1.125 m/s.

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Answer:

A. When one bulb burns out, all the other lights stay lit.

Answer: C.. all bulbs go out.

Explanation:

When a substance freezes, its atoms become locked in place so they do not move from one position to another. Therefore, any substance that is frozen is a solid. Hence, option (D) is correct.

One of the four basic states of matter is solid (the others being liquid, gas, and plasma). The least solid molecules are those that are tightly packed together and make up solids.

A solid is distinguished by its structural rigidity and resistance to external forces. A solid substance, unlike a liquid, does not flow to conform to the shape of its container or, like a gas, expand to cover the entire space. A solid's atoms are connected to one another either in a regular geometric lattice (such as that found in metals and common ice), or in an asymmetrical manner (an amorphous solid such as common window glass).

Therefore, any substance that is frozen is a solid.

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The force of impact at 20 mph is two times that at 10 mph speeds.

An object can change its size or shape, begin moving, stop moving, accelerate, or decelerate as a result of a force acting on it. When two things contact, they exert pressures on one another that are identical in size but directed in the opposite direction.

The combined effect of all the forces acting on an object is known as the "resultant force," and it is the same as if only one force were to be operating on the object in that direction. To alter an object's velocity, the resulting force is necessary.

The force required for increasing speed 20 mph of an object of mass m at an interval of time t be = m×20/t.

The force required for increasing speed 10mph of an object of mass m at an interval of time t be = m×10/t.

Hence, the force of impact at 20 mph is two times that at 10 mph speeds.

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Answer:

0

Explanation:

When water is pumped out of well A, it causes a drop of 7 inches at point C; if water is pumped from well B into well A (at the same rate the water is pumped out of well A), then it will give a rise of 7 inches at well C. Therefore the net drawdown at well C is:

S = 7-7 = 0