Why does the sample on a microscope slide need to be very thin?

A. so it can fit on the stage of the microscope

B. so light can shine through it from below

C. so it can be seen with a diverging lens

D. so the eyepiece lens can be focused properly

Answer:

Energy stored in the capacitor is 0.0018 joules.

Explanation:

It is given that,

Capacitance of the capacitor, [tex]C=25\ \mu F=25\times 10^{-6}\ F[/tex]

Voltage of the battery, V = 12 volt

We have to find the energy stored in the capacitor. The energy stored inside the capacitor is given by :

[tex]E=\dfrac{1}{2}CV^2[/tex]

[tex]E=\dfrac{1}{2}\times 25\times 10^{-6}\ F\times (12\ V)^2[/tex]

E = 0.0018 Joules

Hence, the energy stored in the capacitor is 0.0018 Joules.

As per Newton's law of cooling we know that

[tex]\frac{\Delta T}{dt} = k(T_avg - T_s)[/tex]

in 5 hours the body temperature becomes 79.6 from 84.4

while the surrounding temperature is given as 68 degree F

now from above formula

[tex]\frac{84.4 - 79.6}{5} = k (\frac{84.4 + 79.6}{2} - 68)[/tex]

[tex]0.96 = k(14)[/tex]

now let say the person died "t" time ago

now we will have

[tex]\frac{98.6 - 84.4}{t} = k (\frac{98.6 + 84.4}{2} - 68)[/tex]

[tex]\frac{14.2}{t} = k(23.5)[/tex]

[tex]\frac{14.2}{t} = \frac{0.96}{14}(23.5)[/tex]

[tex]t = 8.8 hours = 9hours (approx)[/tex]

so he died at approx 5 Am in  morning

Answer:

1. 5.83

2. 1.38

3. 4.22

Explanation:

Final answer:

The electromagnetic force between two electrons 2.00 m apart is 2.30 x 10−29 N, and the gravitational force between them is 5.54 x 10−71 N. The ratio of these forces is approximately 4.15 x 10−42.

Explanation:

To compare the magnitude of the electromagnetic and gravitational forces between two electrons separated by a distance of 2.00 m, we can use Coulomb's Law for the electromagnetic force (Fe) and Newton's Law of Universal Gravitation for the gravitational force (Fg).

The formula for Coulomb's Law is Fe = k |q1q2| / r2, where k is Coulomb's constant (8.99 x 109 N m2/C2), q1 and q2 are the charges of the electrons (1.61 x 10−19 C), and r is the separation distance (2.00 m).

The gravitational force is given by Newton's Law of Universal Gravitation, which is Fg = G m1m2 / r2, where G is the gravitational constant (6.67 x 10−11 N m2/kg2), and m1 and m2 are the masses of the electrons (9.11 x 10−31 kg).

After calculating these values, we get:
Fe = 2.30 x 10−29 NFg = 5.54 x 10−71 N
To find the ratio Fe/Fg, we divide the electromagnetic force by the gravitational force, resulting in:
Fe/Fg = 4.15 x 1042.

This illusion demonstrates illusions are influenced by the situational context. Hence, option C is correct.

illusion, a distortion of a "real" sensory stimulus—that is, an interpretation that disagrees with objective "reality" as generally understood. One can say that a child is having an illusion if they believe that tree branches at night are goblins. An experience that appears to start without an outside source of stimulation is what separates an illusion from a hallucination. Both experiences are frequently and repeatedly experienced by almost everyone, although neither one is necessarily a symptom of a psychiatric disorder.

When information from "actual" external stimuli results in a false perception of an item or event, this is known as an illusion. Illusions are unique perceptual experiences.

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Final answer:

The checker shadow illusion demonstrates that illusions are influenced by perceptual constancies because our brains adjust colors based on context to maintain stable perceptions, despite variations in illumination. Option B is correct.

Explanation:

The optical illusion you’re referring to, often known as the checker shadow illusion created by Edward H. Adelson, illustrates that illusions are influenced by perceptual constancies. Square A and square B are indeed the same color, but our brain adjusts the perception based on the context, here influenced by the shadow. The brain tries to maintain color constancy, adjusting the way we perceive color under varying illumination. Therefore, the correct answer is B. Illusions are influenced by perceptual constancies.

Theories of color perception have shown that our visual system makes adjustments based on adjacent lighting conditions and the presence of edges. This processing helps to maintain a stable and consistent perception of color within our environment, which is why square B appears lighter than it really is, due to the compensating effect for the shadow cast by the cylinder.

This illusion is a profound demonstration of how our perceptual system can be tricked, indicating that our brain does not function like a passive camera but rather as an active interpreter of sensory information, projecting a consistent and stable view of the world around us.

Using Ohm's Law (I = V/R), the current through a light bulb connected to a 120 V outlet with a resistance of 30 Ohms is calculated as 4 amps.

The current through a circuit with a light bulb connected to a 120 V outlet can be calculated using Ohm's Law, which states that current (I) equals voltage (V) divided by resistance (R).

Given that the resistance of the bulb is 30 Ohms (30), the current can be found using the formula I = V/R. Substituting the provided values, we get I = 120 V / 30 = 4 amps. Therefore, the current through the circuit is 4 amps.

To answer the initial question:

If a light bulb is connected to a 120 V outlet and the resistance of the bulb is 30 Ohms, the current through the circuit is 4 amps, not 3600 amps, 150 amps, or 0.25 amps.

Answer:

The correct answer would be b.  Climate and temperature can affect an individual’s attitude toward survival.

Climate and temperature play an important role in the survival of an organism.  Every organism or species requires optimum physical and chemical conditions such as temperature, pressure, pH et cetera.

Very high or very low temperature can cause death of an organism. For example, global warming has raised the temperature and salinity of the oceans due to which many marine organisms have died.

Answer:

A tourist bus is carrying passengers from the bottom of a hill to the top. The people, the bus, and the luggage can be analyzed as a single system. The total amount of energy in the system decreases as the bus travels. his situation happens because some of the kinetic energy changes to thermal energy because of friction between the tires and the road.

Explanation:

Answer:

system

decreases

thermal

Explanation: edmentum

Answer: the answer is C balanced because the total number of oxygen atoms is 3.

Explanation: I know this cause I did the assignment and got it correct.

It would take the car 4.6 seconds to accelerate from 0 to 62.0 mph at full power, neglecting friction and air resistance.

We can use the following equation to calculate the acceleration of the car:

[tex]a = \dfrac{v_f - v_i}{t}[/tex]

where:

a is the acceleration of the car (in m/s²)

v_f is the final velocity of the car (in m/s)

v_i is the initial velocity of the car (in m/s)

t is the time it takes for the car to accelerate (in seconds)

We know that the final velocity of the car is 62.0 mph, which is equal to 28.3 m/s. The initial velocity of the car is 0 m/s. We need to solve for the time it takes for the car to accelerate, so let t be represented by the variable x.

[tex]a = \dfrac{28.3 m/s - 0 m/s}{x}a = \dfrac{28.3 m/s}{x}[/tex]

We also know that the acceleration of the car is equal to the force exerted on the car divided by the mass of the car. The force exerted on the car is the power of the car, which is 5000 hp. The mass of the car is 1500 kg.

[tex]a = \dfrac{F}{m}\dfrac{28.3 m/s}{x} = \dfrac{5000 hp}{1500 kg}x = \dfrac{28.3 m/s \cdot 1500 kg}{5000 hp}x = 4.6 seconds[/tex]

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The mystery liquid can be identified by calculating its density using the given mass and volume, and then comparing this with the densities of the available substances.

To identify the mystery liquid, you can calculate its density using the formula for density: density = mass/volume.

We know that the volume of the liquid is 20.0 milliliters and the mass is 15.9 grams, so the density would be 15.9g/20.0ml = 0.795 g/ml.

Now, we'll need to compare this density with the densities of the listed substances (lamp oil, baby oil, vegetable oil, and rubbing alcohol). The option that matches this density most closely would identify the mystery liquid. Since this information is not provided in the question, we can't definitively identify the liquid.

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Resistors connected in series have a total resistance greater than any individual resistor and equal to the sum of all individual resistances. Statement (b) is incorrect, as are (c) and (e), which don't apply to series circuits.

When several resistors are connected in series, the correct statements are as follows:

(a) The total series resistance is greater than the resistance of any of the individual resistors.

(d) The total series resistance is equal to the sum of the resistances of all the individual resistors.

Statement (b) is incorrect because the total resistance of a series circuit cannot be less than any individual resistor's resistance. Statement (c) is also incorrect; while the total current through the circuit is dependent on the applied voltage, the total resistance itself is not dependent on the voltage but only on the value of the resistors in series. Lastly, statement (e) describes the calculation for total resistance in a parallel circuit, not a series circuit.

The resistance of the light bulb is calculated using Ohm's law, which gives approximately 70.59 ohms. The closest given answer choice is B. 71 ohms.

To calculate the resistance of the light bulb that is connected to a 120 V source and draws 1.7 A, we use Ohm's law, which states that Resistance (R) is equal to Voltage (V) divided by Current (I).

R = V / I

Therefore, the resistance of the light bulb is R = 120 V / 1.7 A, which equals approximately 70.59 ohms. When checking against the provided answers, the closest value is 71 ohms. So the correct answer is B. 71.

Electrical things in parallel are typical of circuit elements in homes.

Electrical things in series are not typical of circuit elements in homes.

Every electrical thing in a house is in parallel.  Sometimes they're also in parallel with the electrical devices in other houses nearby. 

the answer is a, a light year. Hope this helped!

Final answer:

The polarity of Earth's magnetic field has reversed multiple times in the geologic past, with these reversals occurring at irregular intervals. Scientists study magnetic characteristics of rocks to understand this phenomenon, which significantly impacts our interpretation of Earth's magnetic history.

Explanation:

In the geologic past, the polarity of Earth's magnetic field has experienced numerous reversals where the magnetic north pole moved to the geographic south pole and vice versa. This phenomenon is known as magnetic reversal. By analyzing the magnetic characteristics of volcanic rocks and other geological formations, scientists have been able to identify periods of normal and reversed magnetism.

During periods of reversed polarity, a compass would have pointed towards what is today considered the geographic south instead of the north, indicating a complete reversal of Earth's magnetic field. These reversals have occurred at irregular intervals throughout Earth's history, ranging from less than 0.1 million years to as much as 50 million years, with the most recent significant event, the Brunhes-Matuyama reversal, happening about 780,000 years ago.

Answer:

Gravitational potential energy transforms into kinetic energy.

Explanation:

It is given that, we have to write energy transformation occurs when a skydiver first jumps from a plane.

Just before jumping from the plane, the skydive exhibit only gravitational potential energy because it is possessed due to height of an object. It can be given by :

PE = m g h

m is the mass of object

g is acceleration due to gravity

h is the height form the surface

As he reaches down, its potential energy decreases continuously and it is converting to kinetic energy. It can be given by :

KE = 0.5 mv²

V is the velocity of object

So, it is clear that the gravitational potential energy si transforms to kinetic energy.                      

The energy transformation that occurs when a skydiver jumps from a plane is the transformation of gravitational potential energy into kinetic energy. The altitude at which the jump happens directly influences the amount of potential energy available for transformation.

When a skydiver first jumps from a plane, the energy transformation that occurs is the conversion of gravitational potential energy into kinetic energy. As the skydiver is at a height, he/she has gravitational potential energy. Once the skydiver jumps out of the plane and begins to fall, this potential energy is transformed into kinetic energy, which is the energy of motion. The higher the altitude from which the skydiver jumps, the larger the amount of potential energy that can be transformed into kinetic energy.

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The statement that best describes the meteor's motion is that its speed was 468 km/min northward, as it signifies the magnitude of speed and the direction of movement.

The correct answer would be 'C' Its speed was 468 km/min northwards. This statement best describes the meteor's motion as it indicates the magnitude of the speed and the direction in which it was moving. The term 'northwards' indicates that the meteor traveled from south to north. It is important to note that velocity would have been appropriate if the question had been about displacement with direction, while acceleration is concerned with the change in velocity over time, which is not given or implied in the question. The question's focus is solely on its movement's direction and speed.

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Basically, when water evaporates, it always absorbs energy. What happens is that a molecule steals surface energy for all molecules until it is hot enough to evaporate. This is how the evaporation process happens. For this reason, the surface cools because the molecules steal the heat from the medium. This can easily be noticed when we sweat and after the water molecules evaporate from our body, it cools.

The water feels cool when it evaporates because the process of evaporation requires energy, and that energy is drawn from the surrounding environment, including our skin.

When water molecules evaporate, they transition from the liquid phase to the gas phase, escaping the surface of the water. During this phase transition, water molecules gain energy from their surroundings to overcome the intermolecular forces holding them together in the liquid. This energy absorption leads to a cooling effect on the surrounding environment.

When water evaporates from our skin, it draws heat energy from our body, which makes us feel cooler.

Overall, the cooling sensation when water evaporates is a result of energy transfer, where the water molecules gain energy from their surroundings, leading to a cooling effect on the surrounding objects or our bodies.

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Answer:

A

Explanation:

It would be a cluster because that's what it is. A cluster of galaxies. a Universe is far to big. And a constellation and solar systems would be inside universes.