A river has a steady speed of 0.500 m/s. a student swims upstream a distance of 1.00 km and swims back to the starting point. (a) if the student can swim at a speed of 1.20 m/s in still water, how long does the trip take? (b) how much time is required in still water for the same length swim? (c) intuitively, why does the swim take lon- ger when there is a current?

Answer:

blue

Explanation:

The color of light would heat a yellow brick the most is blue.

A flame of light consists of different layers of light with different colors.

The colors include the following;

The inner core of the flame is blue which is the hottest and the color changes to yellow, orange and red towards the center of the flame with decreasing temperature.

Thus, the color of light would heat a yellow brick the most is blue.

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Orange light from the visible spectrum has a longer wavelength but less frequency and energy than green light. This is due to the inherent relationships between these properties of light.

When comparing green and orange light from the visible spectrum, one must consider the relationships between wavelength, frequency, and energy. Light with a longer wavelength has less frequency and energy. Orange light falls at about 590-620 nm on the visible light spectrum, while green is at 495-570 nm.

This shows that orange light has a longer wavelength but less frequency and energy than green light. This is due to the inverse relationship that exists between wavelength and frequency (the longer the wavelength, the lower the frequency) and the direct relationship between frequency and energy (the higher the frequency, the greater the energy).

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Final answer:

Green light has a longer wavelength, lower frequency, and less energy compared to orange light in the visible spectrum.

Explanation:

When comparing green and orange light within visible spectrum, it's important to understand their characteristics in terms of wavelength, frequency, and energy. Green light has longer wavelength than orange light.

Consequently, because the frequency of light is inversely proportional to its wavelength, green light has a lower frequency than orange light. When it comes to energy, the shorter the wavelength, the higher the energy; therefore, green light has less energy than orange light.

Diffraction or refraction

Answer: C) This is an example of refraction and not diffraction.

Explanation: The reason for the straw to appear bent at the water's surface is because of the process of refraction. Light travels at different speeds in different medium because of the varying densities.

The light travels from air to water and thus the difference in speed results in an apparent shift of the position of part of straw under water and thus the part appears broken.

Reflection is the the return of sound or light energy from the surface without absorbing it.

Diffraction is the phenomenon which occurs when the wave encounters an obstacle.

It will take a train to 9 hours to travel 765 miles at 85 miles per hour.

The time taken to travel a certain distance can be calculated using the following expression;

Average speed = Distance traveled ÷ time taken

According to this question, a train is traveling 765 miles at 85 miles per hour. The time it takes is calculated as follows:

Time = 765miles ÷ 85mph

Time = 9 hours

Therefore, it will take a train to 9 hours to travel 765 miles at 85 miles per hour.

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C. 6 m/s2 is correct

Light pollution, caused by scattered light from outdoor artificial lighting, not only impacts astronomy but disrupts animal life cycles and contributes to unnecessary energy waste. New forms of light pollution like reflections from commercial satellites are additionally disrupting astronomical photography.

The brightening of the night sky by light scattered from artificial outdoor lighting is referred to as Light Pollution. This essentially is the wasted light that spills into our night sky, hindering the visibility of stars and planets - an issue of significant concern for astronomers. However, Light Pollution also disrupts life cycles of animals we share our urban and suburban environment with and leads to unnecessary operational costs for municipalities due to the excessive usage of fossil fuels.

Moreover, recent developments have indicated a new threat in the form of multiple commercial companies planning and launching numerous satellites into low-Earth orbit. This is being done to provide internet access globally, but these satellites reflect sunlight, which has started to negatively impact astronomical photography.

There are initiatives channels that share comprehensive data on Light Pollution like the International Dark-Sky Association, and citizen science projects such as Globe at Night, aimed at inviting citizens to gauge the light levels in our communities.

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The required force  to accelerate an object having a mass of 3 kg at 5 m/s² is 15 N.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

A spring balance can be used to calculate the Force. The Newton is the SI unit of force.

Given parameters:

Mass of the object: m = 3 kg.

acceleration of the object: a = 5 m/s².

Hence, from Newton's 2nd law of motion:

force = mass × acceleration

= 3 kg × 5 m/s²

= 15 N.

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A position in the Caribbean Sea that is 20 degrees north latitude and 65 degrees west longitude is east of Central America and south of Bermuda. Typically, it is close to South America's northern shore.

In the Caribbean Sea, east of Central America and south of Bermuda, a position is indicated by latitude 20 degrees north and longitude 65 degrees west.

This geographic location is roughly located near South America's northern coast. It describes a place with tropical weather, lush habitats, and a wide variety of marine life.

Thus, the coordinates are important for navigation, weather monitoring, and regional research because they show how the Earth's geography is dynamic and how latitude and longitude interact to define certain places on our world.

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Latitude 20 degrees north and longitude 65 degrees west locate a point in the North Atlantic Ocean, northeast of the Caribbean Sea using the geographic coordinate system.

The question asks about a location defined by latitude 20 degrees north and longitude 65 degrees west. Latitude and longitude are part of the geographic coordinate system, which is used to pinpoint any location on the Earth's surface. Latitude indicates the position north or south of the equator and ranges from 0 to 90 degrees. Longitude, on the other hand, indicates the position east or west of the prime meridian, which runs through Greenwich, England, and ranges from 0 to 180 degrees. The coordinate pair provided corresponds to a point in the North Atlantic Ocean, northeast of the Caribbean Sea.

Silver solder is an alloy with a specific percentage composition that can be graphically represented using a pie chart or bar graph. Alloys combine metals like silver, tin, copper, and zinc to create a material with properties superior to its individual components.

Silver solder is an alloy that consists of multiple metallic components, each with a specific percentage contributing to the total composition. To visually represent the composition of silver solder, one would typically use a pie chart or a bar graph. Given the percentages, we see that silver and tin each make up 40% of the alloy, followed by copper at 14%, and zinc at 6%.

In the making of alloys like silver solder, the individual elements such as tin (Sn) are often produced through processes such as the reduction of tin oxide (SnO₂) with carbon to yield molten tin, which is then drawn off and cast into blocks. The general properties of such elements, including metalloids and their compounds like boron and silicon, are critical to understanding the behavior and uses of the final alloy.

Alloys have properties that differ from those of their constituent metals; for example, they may be harder, more durable, or have better thermal or electrical conductivity. This is why they are often utilized in areas where such enhanced properties are desired.

Final answer:

Silver solder is a mixture of 40 percent silver, 40 percent tin, 14 percent copper, and 6 percent zinc. A graph that shows the composition of silver solder can be drawn using a bar graph or a pie chart.

Explanation:

Silver solder is a mixture of 40 percent silver, 40 percent tin, 14 percent copper, and 6 percent zinc. To draw a graph that shows the composition of silver solder, you can use a bar graph or a pie chart. In the bar graph, you can represent each element with a bar of the corresponding percentage. In the pie chart, you can divide a circle into four sections, each representing one component and its percentage.

Tides are principally influenced by the difference in the Moon's gravitational pull on different parts of the Earth, called differential forces, rather than just the strength of the gravitational pull. The Sun's tidal force also impacts tides, but to a lesser extent. It's the differential forces that mainly shape tides.

Tides, the twice-daily rising and falling of the sea, are primarily influenced by the difference in the strength of the Moon's gravitational pull on different parts of the Earth, known as differential forces. These forces are caused by the fact that the Earth's parts are not all equally distant from the Moon. The side of Earth nearest the Moon is attracted more strongly, creating a distortion or stretch in the Earth represented by an oblate spheroid shape.

The Sun also exerts a tidal force, yet although its gravitational pull on Earth is nearly 200 times that of the Moon, the tidal effect of the Sun is less than that of the Moon due to relative distances and sizes. Depending on the relative positions of the Moon, Sun, and Earth, the net tidal effect can be amplified or attenuated.

Therefore, while both the strength of a gravitational pull and the differences in these strengths play a role, it is the differential forces - the differences in the Moon's gravitational pull on various parts of Earth - that primarily dictates the behavior of tides.

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Time and Distance do not involve direction, as they are scalar quantities. Conversely, Velocity and Acceleration indicate both magnitude and direction, making them vector quantities.

In the context of physics, the terms listed have different implications with regards to direction. Specifically, options A (Time) and C (Distance) do not involve a direction.

Time is a scalar quantity, and it doesn't imply any specific direction. Similarly, Distance is a scalar measurement of the interval between two locations without concerning the direction of travel.

In contrast, both Velocity and Acceleration are vector quantities, meaning they have both magnitude and direction. Velocity is the displacement over time, indicating the rate at which an object changes its position, oriented towards the direction of displacement. Acceleration, on the other hand, depicts the rate of change of velocity, also factoring in the direction in which velocity is changing.

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If the total trip took 2.2 secs, then it must took 1.1 secs to reach max height. 

We can then find the max height by realizing that the bag fell from rest and took 1.1 secs to come back to its launch point, we use formula:

hmax  = 1/2 gt^2 = 1/2 (9.8m/s/s)(1.1s)^2 
hmax =5.93m   (ANSWER)

To get the initial speed, we take that the vertical speed is zero at max height, and use 

vf^2=v0^2+2ad 

vf=final speed =0 
v0=intiial speed 
a=acceleration = -9.8m/s/s 
d=distance traveled =hmax= 5.93m 

0=v0^2+2(-9.8ms/s/)(5.93m) 
v0^2=2x9.8x5.93 
v0=10.8m/s  (ANSWER)

If Ari feels compelled  to carry out repetitive tasks the same way very frequently and  if he does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable then he must be going through c) OCD

OCD stands for Obsessive compulsive disorder is a mental health condition of obsessions and compulsions . It is a common and long lasting disorder in which a person has uncontrollable , reoccurring thoughts and behaviors that a person can feel the urge to repeat over and over .

hence , According to question Ari feels compelled  to carry out repetitive tasks the same way very frequently that means he feels uncontrollable and compelled / forced to do few tasks because of OCD.

and  if he does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable because of reoccurring thought of doing things over and over again

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The linear speed of a bicycle wheel with a circumference of 2 meters rotating at 1 revolution per second is 2 meters per second.

The question seeks to find the linear speed of a bicycle wheel given its circumference and rotation rate. The circumference of the bicycle wheel is 2 meters, and it rotates at 1 revolution per second. To calculate the linear speed, we use the relationship that the linear speed (v) is the circumference (C) divided by the period of rotation (T). Since the wheel completes one revolution per second, the period T is 1 second.

Therefore, the linear speed v is given by:

v = C/T

v = 2 meters / 1 second

v = 2 meters per second (m/s).

This calculation shows that if a bicycle wheel with a circumference of 2 meters rotates at 1 revolution per second, its linear speed is 2 m/s.

To convert the gravitational acceleration from flurg/grom² to meters/second², we use the relationships 5.24 flurg = 1 meter and 1 grom = 0.493 second. This results in a converted gravitational acceleration of 5.724 meters/second^2 on Omicron Persei 7.

To convert the gravitational acceleration from flurg/grom² to meters/second², we need to use the given unit equality relationships:

5.24 flurg = 1 meter

1 grom = 0.493 second

The given acceleration is 7.29 flurg/grom².

First, we will convert flurg to meters and grom to seconds:

Convert flurg to meters:

7.29 flurg/grom² is equivalent to (7.29 flurg / grom²) x (1 meter / 5.24 flurg)

= (7.29 / 5.24) meter / grom² = 1.391 meters/grom².

Convert grom² to seconds²: 1 grom = 0.493 seconds,

so (1.391 meters / grom²) x (1 grom² / (0.493 seconds)²)

= 1.391 / (0.493 x 0.493) meters / seconds²

= 1.391 / 0.243049 meters / seconds²

= 5.724 meters/second².

Therefore, the acceleration of a freely falling object at the surface of Omicron Persei 7 is 5.724 meters/second².

The x and y scalar component of the displacement vector is 171.18 m and 55.62 m respectively

This question can be solved using the techneques of finding the x and y component of a vector

Vectors: These are quantity that can be measure both in magnitude and direction. E.g velocity, displement, acceleration, Force etc.

x = Rcos∅................ Equation 1

       x = 180cos18

        x = 180(0.951)

        x = 171.18 m

         y = Rsin∅............... Equation 2

        y = 180sin18

        y = 180(0.309)

       y = 55.62 m.

Hence, the x and y scalar component of the displacement vector is 171.18 m and 55.62 m respectively

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