2. Review the chart above. What information about ultraviolet radiation supports or
contradicts the safety of solar radiation exposure to astronauts on the international
space station?
The table shows the amount of time astronauts spent on the surface of Moon during

This research survey is an example of a flawed or invalid measure of intelligence.

The research survey that is shown in this question can be defined as a poor measurement tool for assessing intelligence. One can easily identify that the researchers are measuring intelligence by asking about the favorite color of the personnel, which has nothing to do with the intelligence of the person. This survey lack validity which is essential to measure the intelligence of any personnel through a survey.

The survey also lacks reliability as it can't provide consistent results. If the intelligence of any personnel is somehow related to the intelligence of the person, answering the survey multiple times must give the same answer. This doesn't provide consistent result and lack reliability and realism.

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Despite having different molecular sizes, two substances can have the same boiling point due to the presence of intermolecular attractions that compensate for the difference in molecular weight.

Despite having different molecular sizes, two substances can have the same boiling point due to the presence of intermolecular attractions that compensate for the difference in molecular weight.

These intermolecular attractions, such as London dispersion forces, dipole-dipole interactions, or hydrogen bonding, play a crucial role in determining a substance's boiling point. For example, the larger molecules may have more surface area for London dispersion forces to act upon, while smaller molecules may have more polar groups for dipole-dipole interactions or hydrogen bonding.

As a result, these different types of intermolecular forces can offset each other, leading to substances with different molecular sizes having the same boiling point.

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The new potential energy you will have, given that your height is doubled is 114 J

The following data were obtained from the question:

The new potential energy can be obtained as illustrated below:

PE₁ / h₁ = PE₂ / h₂

57 / H = PE₂ / 2H

Cross multiply

57 × 2H = PE₂ × H

Divide both sides by H

PE₂ = (57 × 2H) / H

PE₂ = 57 × 2

PE₂ = 114 J

Thus, from the above calculation, we can conclude that the new potential energy is 114 J

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The net charge when you rub a plastic ruler with fur​ would be infinitesimal or zero

The effect of friction between a plastic ruler and fur is evident when electrons are transferred from the hairy surface to the ruler's plane, ending with the ruler possessing a negative charge while the fur taking on a positive one.

As a result, the whole system presents with a net charge that is negative it converges due to the excess electrons now found on the ruler. However, occasionally, the magnitude of this charge is very small, consequently making it difficult to probe without reliable technology or instruments.

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Answer:

B. 200 kgm/s

Explanation:

The initial momentum of the blue train can be calculated using the formula:

p = mv

where p is the momentum, m is the mass, and v is the velocity.

The mass of the blue train is 50 kg and its velocity is 4 m/s. Therefore, the initial momentum of the blue train is:

p = 50 kg x 4 m/s = 200 kgm/s

Therefore, the initial momentum of the blue train is 200 kgm/s, which is option B.

Answer:

Melting Point = -50 °C

Boiling Point = 50 °C

Explanation:

A heating curve displays a substance in its 3 states.

On the graph, each region where the slope is positive represents the substance as a solid, liquid, or gas.

When the slope is 0, this is the temperature point at which the substance's state of matter has changed (i.e., melting or boiling/vaporization point) – also known as a phase transition. Essentially, the 0 slope regions are where the substance is changing from one state of matter to the next.

(When the substance is being heated, it's absorbing energy, but when it reaches a phase transition point, the substance begins to consume energy to change its matter state. That's why the temperature doesn't go up while the substance's internal Energy increases.)

In (Figure 1), where 'x' is Energy (J) and 'y' is Temperature (°C):

Region A (0 J ≤ x ≤ 200 J):

The slope is positive, so the substance is in a constant matter state. Because it's the first sloped region, the substance is in its solid state from -100 °C to -50 °C.

Region B (200 J ≤ x 600 J):

The slope is 0, so the substance has reached a phase transition point. Because the previous region was when the substance was solid, that means that the temperature throughout Region B is the melting point at -50 °C.

Region C (600 J ≤ x ≤ 800 J):

The slope is positive so the substance is in a constant matter state. We've already identified when the substance was solid and when it melted, so now the substance is in its liquid state from -50 °C to 50 °C.

Region D (800 J ≤ x ≤ 900 J):

The slope is 0, and since the previous region was when the substance was a liquid, it's now reached its boiling point at 50 °C.

Region E (900 J ≤ x ≤ 1000 J):

The slope is positive, and we've previously identified all of the transition points and matter states except for one, so the substance is now in its gaseous state after reaching 100°C.

(Once a substance reaches its gaseous state, the Temperature/Energy ratio is constant.)

The elongation of the rod beyond its original length would be 2.5 mm.

To elongation of the rod can be deduced using the formula:

ΔL = FL / AE

where:

The cross-sectional area of the steel rod is given by:

The force applied to the rod:

Thus:

ΔL = (98.1 x 2) / ((7.85 x [tex]10^{-7[/tex]) x (200 x [tex]10^9[/tex] ))

ΔL = 0.0025 m = 2.5 mm

In other words, the elongation of the steel rod beyond its original length is 2.5 mm.

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Answer: Doubled

Explanation:

=When three resistors are connected in parallel, they form a parallel circuit. In a parallel circuit, each resistor is connected across the same two points, with the current split between the resistors.

In this configuration, the voltage across each resistor is the same, but the current through each resistor can be different. The total resistance of the circuit is calculated using the equation:

1/R_total = 1/R1 + 1/R2 + 1/R3

where R1, R2, and R3 are the resistance values of the individual resistors.

The total current in the circuit is equal to the sum of the currents through each resistor:

I_total = I1 + I2 + I3

where I1, I2, and I3 are the currents through each resistor.

The total power dissipated in the circuit can be calculated using the equation:

P_total = V² / R_total

where V is the voltage across the resistors.

In summary, when three resistors are connected in parallel, they form a parallel circuit, with each resistor connected across the same two points, and the current split between them. The total resistance, current, and power dissipated in the circuit can be calculated using the equations provided.

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In electrical and electronics circuits, amplitude is the maximum value of a signal. This is known as the strength or intensity of the signal. Phase, can be seen as the timing relationship between two signals or waveforms. It tell the time it takes betwen the peaks or zero crossings of two waveforms

In electrical and electronics circuits, phase tell us about the the relationship between currents in different parts of the circuit, For example in AC circuits with multiple components.

We the amplitude and phase of signals in electrical and electronics circuits is understood, it becomes easier to design and analyz circuits, and can even be used for troubleshooting and maintaining them.

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Ans. 0.75

To convert watts into kilowatts we must divide it by 1000

so dividing 750W by 1000

we get,

750/1000 = 0.75

hence 750W in kilowatts equals to 0.75

Answer:

L = 7m

Explanation:

The beam is balanced (not moving), so the moments about the pivot have to sum to 0.

Let x = dist. from pivot to the 10N ↓ force

CCW rotation is +

CW rotation is -

(100 N)(3 m) - (10 N)(x) - (40 N)(L) = 0

300 N·m - (10 N)(x) - (40 N)(L) = 0      divide by 10 on both sides

30 - x - 4L = 0

x + 4L = 30

10N is the Weight of the beam, so it is at the midpoint of the beam.

x = 5 - 3 = 2 m  substitute into the equation above:

2 + 4L = 30

4L = 30 - 2 = 28

L = 28/4 = 7 m

Answer: The answer is C

Explanation: because I got it correct

C. A movement that results in the body's use of energy.

WHO has defined physical activity as any bodily movement that requires expenditure of energy.

Physical activity includes both exercise as well as integrated activities of one's daily routine.

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Answer:

A  1.25 m²

Explanation:

The tourist is standing one-third of the way along the bridge (option c).

Let's denote the distance from the near end of the bridge to the point where the tourist is standing as x and the total length of the bridge as L.

According to the equilibrium condition, the sum of the forces exerted on the bridge is zero.

So, the vertical forces exerted by the two concrete supports should be equal to the weight of the tourist:

F_near + F_far = 705 N

Given that the magnitude of the vertical force exerted by the near end support is 470 N, we can calculate the force exerted by the far end support:

F_far = 705 N - 470 N = 235 N

Now, we can use the moment equilibrium condition, considering moments around the near end support:

Moment = Force × Distance

For the tourist:

Moment_tourist = 705 N × x

For the far end support:

Moment_far = 235 N × L

For equilibrium, the sum of the moments should be zero:

Moment_tourist - Moment_far = 0

Substituting the moments:

705 N × x - 235 N × L = 0

Now, we can solve for x/L, which represents the fraction of the way along the bridge where the tourist is standing:

x/L = (235 N × L) / 705 N

x/L = 235/705 = 47/141 ≈ 1/3

So, the tourist is standing one-third of the way along the bridge (option c).

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Answer:

Sound waves cause particles to vibrate perpendicular to the direction of the wave.

Answer:

The water cycle outlines the continuous water movement in liquid, solid and gaseous state between locations on the Earth's surface.

The glass jar represents the lake while the atmosphere is represented by the space above the water, and the sky is represented by the (clear) plastic wrap

Arrangement description and Processes;

The processes of the water cycle includes;

Evaporation;

Condensation

Precipitation

Sublimation

Runoff

Infiltration

The arrangement of the materials is as follows;

Place the glass jar (the lake) containing water and the lamp (the Sun) side by side, such that the lamp light shines on the water surface

Cover the glass jar by wrapping the plastic wrap (the sky) around it to prevent the escape of water vapor when the water is hot.

Switch on the lamp so that it heats the water by radiation heat transfer

Observed processes;

The processes demonstrated by the above experiment includes;

1) Evaporation: As the water in the glass jar becomes warmer, the level of the water in the jar can be observed to decrease slightly due to evaporation

2) Condensation: Fog formation, Clouds

When hotter, the water surface as seen through the clear plastic wrap becomes less clearer due to evaporation, and condensation of the vapor while floating above the water surface, similar to the clouds seen in the sky.

3. Precipitation: Rain;

The clear plastic wrap covering the top of the glass jar, prevents the movement of the vapor further away, such that the tiny condensed vapor gather together, to form big droplets under the plastic wrap that falls back into the jar, which is similar to the process of rainfall

The above processes are repeated as more water evaporates from the jar condenses on the plastic wrap and falls back into the jar, showing the process by which water is recycled from the lake into the atmosphere and back to the lake.

Explanation:

Two whistles emitting sound of wavelength 3.2 m and 2.9 m would produce a beat of frequency 11 Hertz, hence option e.

The beat frequency (f_beat) is given by the difference in frequency (f) between the two whistles,

f_beat = |f₁ - f₂ |, frequencies of the two whistles are f₁ and f₂ . The frequencies can be calculated from the wavelengths (λ) using the formula,

f = c/λ, speed of sound in air is c, which is approximately 343 m/s at room temperature and atmospheric pressure. For the first whistle with a wavelength of 3.2 m,

f₁ = c/λ₁

= 343/3.2

= 107.1875 Hz

For the second whistle with a wavelength of 2.9 m,

f₂ = c/λ₂

= 343/2.9

= 118.2759 Hz

The difference in frequency is,

f_beat = |f_1 - f_2|

= |107.1875 - 118.2759| ≈ 11.1 Hz

Therefore, the beat frequency is approximately 11 hertz.

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Amplitude is the maximum vertical displacement of the seismic waves on the Seismogram. As evident from the graph, it is 60 mm.

1. Time at which P waves arrive- 0 sec

Time at which S waves arrive- 18 sec

S-P interval= Time at which S wave arrive- Time at which P wave arrive

S-P interval= 18-0= 18 sec

2. Amplitude is the maximum vertical displacement of the seismic waves on the Seismogram. As evident from the graph, it is 60 mm.

3. The distance is around 150 km and is evident on the Distance/S-P bar chart.

4. The magnitude is about 4 and can be found by joining S-P interval (18 sec) with the Amplitude i.e., 6 mm. The point of intersection of the line to the magnitude line gives the magnitude, i.e., 4.

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Answer:

an electron.

Explanation:

When you walk on a carpet, some of the electrons from the atoms in the carpet are transferred to your body, giving you a negative charge. The electrons are then transferred back to the carpet when you touch a conductor, such as a doorknob, which can give you a shock due to the discharge of the static electricity.

Answer: Voltage

Explanation: Not really sure what all that other stuff is after your question...

The "force" that moves electric charge carriers through an electric circuit is ________.

An electric charge carrier moving through a circuit is a charged particle (usually electrons). The force that pushes it is called an electromagnetic force, commonly known as EMF.

Between atoms, EMFs are what attract electrons from one atom to another to form bonds. Likewise, In a circuit, the EMF is the driving force, which is known as voltage.

Superconductivity refers to a state in which these charge carriers travel at a specific voltage with no resistance, meaning no energy is lost. However, this isn't an independent force, so it's incorrect.

Resistance affects the circuit by slightly dampening the flow of charge carriers. Resistance commonly comes in the form of temperature or simply a characteristic of the material through which the circuit flows, so this is incorrect.

Current merely refers to the flow of charge carriers through a circuit in a given time window.

(Think of a circuit as a water pipe. Current is like the speed of a specific amount of water and Voltage (or EMF) is the pressure in the pipe. The higher the pressure, the faster the water flows. Resistance is anything in the pipe that impedes the water flow)

The equation to calculate both of them are:

KE = 1/2 * m * v^2

PE = m * g * h

Kinetic energy is described as the energy an object possesses due to its motion. The equation to calculate kinetic energy is:

KE = 1/2 * m * v^2

Where:

KE = Kinetic energy

m = Mass of the object

v = Velocity of the object

Potential energy is described as  the energy an object possesses due to its position or configuration.

. The equation to calculate gravitational potential energy is:

PE = m * g * h

Where:

PE = Gravitational potential energy

m = Mass of the object

g = Acceleration due to gravity (9.81 m/s^2 on Earth)

h = Height or elevation of the object relative to a reference point

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OA: A. A claim, assumption, or method that is commonly thought to be based on science but is not scientific.

Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.

A claim, assumption, or method that is commonly thought to be based on science but is not scientific is called pseudoscience. Pseudoscience is often presented as being scientific, but it does not meet the criteria of science. For example, pseudoscience may be based on speculation or personal opinion, rather than on evidence. It may also be based on experiments that are not properly controlled or that are not reproducible.

Pseudoscience can be harmful because it can lead people to make decisions that are not based on evidence. For example, people who believe in pseudoscience may be more likely to avoid proven medical treatments or to use unproven treatments that could actually be harmful.

It is important to be able to identify pseudoscience so that you can make informed decisions about your health and your life. If you are unsure whether something is pseudoscience, you can ask a scientist or do some research to find out more.

The position of the center of mass of the system from corner A is 4.3692cm.

To find the position of the center of mass of the system, we need to use the formula:

C.M. = (m1r1 + m2r2 + m3r3 + m4r4)/(m1 + m2 + m3 + m4)

where m1, m2, m3, and m4 are the masses of the four-point masses, and r1, r2, r3, and r4 are the distances of the point masses from the reference point (in this case, corner A).

Let's first find the distances of the four-point masses from corner A. We can see that the distance of the 2kg mass from corner A is 2 cm. The distance of the 4kg mass from corner A is the diagonal of a square of side 2 cm, which is sqrt(22 + 22) = 2.828 cm. Similarly, the distances of the 6kg and 8kg masses from corner A are also 2.828 cm.

Now, let's substitute the values in the formula:

C.M. = (2kg2cm + 4kg2.828cm + 6kg2.828cm + 8kg2.828cm)/(2kg + 4kg + 6kg + 8kg)

C.M. = (4cm + 11.312cm + 16.968cm + 22.624cm)/20kg

C.M. = 1.824cm + 0.5656cm + 0.8484cm + 1.1312cm

C.M. = 4.3692cm

Therefore, the position of the center of mass of the system from corner A is 4.3692cm.

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To solve this problem, we can use the conservation of momentum and the conservation of kinetic energy.First, let's find the velocity of the 0.530-kg cart after the collision. We can use the conservation of momentum:m1v1 + m2v2 = m1v1' + m2v2'where m1 and v1 are the mass and velocity of the 0.530-kg cart before the collision, m2 and v2 are the mass and velocity of the 0.25-kg cart before the collision, and v1' and v2' are the velocities of the carts after the collision.Plugging in the numbers, we get:(0.530 kg)(0.572 m/s) + (0.25 kg)(0 m/s) = (0.530 kg)v1' + (0.25 kg)v2'Solving for v1', we get:v1' = [(0.530 kg)(0.572 m/s) + (0.25 kg)(0 m/s)] / (0.530 kg + 0.25 kg) = 0.378 m/s to the rightSo the 0.530-kg cart moves off to the right at 0.378 m/s after the collision.Next, let's find the maximum compression of the spring. We can use the conservation of kinetic energy:(1/2)m2v2^2 = (1/2)kx^2where k is the spring constant and x is the maximum compression of the spring.We know the mass and velocity of the 0.25-kg cart before the collision (v2 = 0 m/s), so we can solve for k:k = 2(1/2)m2v2^2 / x^2 = m2v2^2 / x^2Plugging in the numbers, we get:k = (0.25 kg)(0 m/s)^2 / x^2 = 0This means that the spring constant is 0, which is not physically possible. Therefore, there must be an error in the problem statement or some missing information that would allow us to calculate the maximum compression of the spring.

The dimension of the moment of inertia is [tex]ML^2[/tex]. Option A.

The moment of inertia represents the resistance of a body to rotational motion. It depends on the body's mass and the distribution of that mass around the axis of rotation.

The formula for the moment of inertia involves mass and distance and is expressed as:

I = mr^2

where

The dimension of mass is represented by M, and the dimension of distance is represented by L. Therefore, the dimension of moment of inertia is:

Moment of inertia = mass x distance^2 = M x L^2 = [tex]ML^2[/tex].

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Answer:

biomass energy, hydropower and wind energy

Answer:

he tripped ballanced forces ballanced forces