When you are paddling a canoe, you push the water backwards with your paddle, witch in turn will push you forward. Witch law of motion described in this scenario

The kayaker needs to paddle at an angle of 41.81º opposite to the current so that he can travel straight across the harbor, and it will take him 44.73 seconds to cross.

This is a 2-dimensional problem, since the kayaker can move in 2 dimensions over the river. For our study, we will model how does the kayaker move in the direction transversal to the river (meaning across the river), and longitudinal to the river (meaning along the river).

On the first part of this problem, we're asked to compute the direction at which the kayaker needs to paddle so that he moves only transversal to the river flow. Since the river flow has a velocity of 2 meters per second on the longitudinal direction, then the kayaker must have a velocity opposite to the river flow on the longitudinal direction of 2 meters per second.

Since he can paddle with a speed of 3 meters per second, we can make a right triangle (check the attached figure), and through trigonometry find the angle at which he needs to paddle against the river to only move in the transversal direction. Therefor we can write:

[tex]sin(\theta) = \frac{2}{3}[/tex]

Therefor [tex]\theta[/tex] is 41.81 degrees. This means that the kayaker moves across the river with a velocity 2.24 meters per second. With this velocity and the width of the river, we can easily find that the time it will take to cross is 44.73 seconds.

Right triangle, velocity, sine of angle.

Answer:

Option (c)

Explanation:

A compound microscope is an optical instruments which can use to see the highly magnified image of very tiny objects.

It consists of two convex lenses.

1. Objective lens: It is a convex lens of short focal length and of short aperture.

It is located at the object side.

2. Eyepiece: It is a convex lens of comparatively large focal length and of large aperture.

It is located at the side from where we can see the image of the object.

The first digit of an interstate highway loop route number that meets the primary route at both ends is always an odd number, indicating it is a spur or a loop off of the main interstate route.

The question relates to the numbering system of interstate highways in the United States. If an interstate highway is a loop that reconnects with the primary interstate route, the first digit of its route number will always be an odd number.

Specifically, these loops are usually three-digit numbers with the last two digits matching the main interstate and the first digit signifying it is a loop or spur.

For example, Interstate 495 would be a loop off of Interstate 95.

The gravitational force between earth and the sun

F = (G*Me*Ms)/Des

So exerting force will be same on each other.

A steam burn is more damaging than a burn from boiling water at the same temperature due to the release of latent heat energy when steam comes into contact with the skin.

A steam burn is more damaging than a burn from boiling water at the same temperature because steam carries more energy due to its phase change from water to steam. When water is heated to boiling point, it absorbs a significant amount of heat energy to change from liquid to gas. When this steam comes into contact with the skin, it releases the latent heat, causing a more severe burn.

Tensile force refers to the stretching force experienced when forces pull on both ends of a material like wire. Equal and opposite forces lead to tension that is equally distributed across the material, as seen in Figure 5.24. The example of a tightrope walker underscores that most of the tension resides in the wire itself rather than supporting the walker's weight.

In Physics, the term tensile force is used to describe the stretching force a material experiences when forces are applied on opposing sides, such as a wire being pulled on both ends. In your case, the brass wire has to withstand a tensile force of 350N without breaking.

Considering the principles behind tensile force, the concept of equal and opposing forces holds significant value as depicted in Figure 5.24. This is due to Newton's third law which states that every action has an equal and opposite reaction, ensuring that the tension in the wire is equal throughout. If the tension at one spot in the brass wire could handle 350N, this could be applied across the entire wire.

The tightrope example illustrates a situation where the tensile force is employed. However, not all this tension is used to support the weight of the tightrope walker as the horizontal components are in opposite directions and cancel out. Hence, most of the tension resides in the wire itself.

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Plants do not need light energy during the Calvin Cycle of photosynthesis.

When a plant is entering the calvin cycle of photosynthesis, light energy is not required to proceed. The Calvin cycle, also known as the light-independent reactions, utilizes energy stored during the light-dependent reactions to convert carbon dioxide into glucose.

Answer:

Whether or not you actually exercise each week is greatly influence by your mindset.

Explanation:

Mindset refers to the way you organize your thoughts and decide to face everyday situations. The way you reflect on a particular situation, and especially how you choose to act upon that personal analysis, can determine your success or failure. So if you can work out each week without fail, it is a big influence by your mindset.

The period (T) of uniform circular motion if the velocity is [tex]40.0 m/s[/tex] and centripetal acceleration is [tex]20.0 m/s^2[/tex] is approximately 8.9 seconds.

Finding the Period (T) in Uniform Circular Motion

To calculate the period (T) of an object in uniform circular motion, we need to relate the given velocity and centripetal acceleration to the formula involving period and radius.

First, let's use the centripetal acceleration formula:

[tex]|a| = |v|^2 / r[/tex]

We know:

By rearranging the formula to solve for the radius (r):

[tex]r = v^2 / a[/tex]

Now, substitute the given values:

[tex]r = (40.0 m/s)^2 / 20.0 m/s^2 = 1600 / 20 = 80 m[/tex]

Next, we use the relationship between the period and radius:

[tex]a = 4\pi^2r / T^2[/tex]

Rearranging to solve for T:

[tex]T^2 = 4\pi^2r / a[/tex]

Substitute the known values:

[tex]T^2 = 4\pi^2 * 80 / 20\\T^2 = (4 \times 9.87 \times 80) / 20 = 1583 / 20 = 79.16[/tex]

Therefore:

[tex]T = \sqrt{79.16} = 8.9 s[/tex]

To solve this problem, we must first assume that the gas acts like an ideal gas so that we can use the ideal gas equation:

 P V = n R T

where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant and T is the absolute temperature

Assuming that the number of moles is constant, then we can write all the variables in the left side:

P V / T = k            where k is a constant (n times R)

Equating two conditions or two states:

P1 V1 / T1 = P2 V2 / T2

We are given that V2 = 2 V1 therefore

P1 V1 T2 = P2 (2V1) T1

P1 T2 = 2 P2 T1

Additionally we are given that the temperature in Celsius is doubled, however in the formula we use the absolute temperature in Kelvin, therefore:

T1 (K) = T1 + 273.15

T2 (K) = 2T1 + 273.15

and P1 = 12 atm

Substituting:

12 (2T1 + 273.15)  = 2 P2 (T1 + 273.15)

P2 = 6 (2T1 + 273.15) / (T1 + 273.15)

Assuming that a nice spring day in Chicago has a temperature of 15 Celsius, therefore:

P2 = 6 (2*15 + 273.15) / (15 + 273.15)

P2 = 6.312 atm

When the Celsius temperature of a gas in a container doubles, and the gas is transferred to a new container with twice the original volume, the new pressure of the system can be computed using the combined gas law.

This Physics question involves understanding how gas laws work. Given the scenario where the Celsius temperature doubles and the gas is transferred to a container functioning at twice the original volume, several gas laws come into play such as Boyle's law and Charles's law, which relate pressure, volume, and temperature.

Let's look at Charles's law first. It states that volume is proportional to the absolute temperature, assuming constant pressure. From this law, we know that the gas's volume will increase when the temperature doubles. Meanwhile, according to Boyle's law, at constant temperature, the pressure and volume of a gas are inversely proportional. In other words, if you double the volume of the container, the pressure will be halved.

The new pressure will be derived by applying the combined gas law which factors the changes in both temperature and volume. Using Combined Gas law which is (P1V1)/T1 = (P2V2)/T2 where the pressures are in atmospheres, volumes in liters, and temperature in Kelvin, you can solve the new pressure in the system.

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Chemical compounds that absorb significant amounts of the sun's energy in the atmosphere are greenhouse gases such as carbon dioxide, methane, and water vapor, along with dust particles.

The chemical compounds that absorb large amounts of the sun's energy in the Earth's atmosphere are primarily greenhouse gases. These include carbon dioxide, methane, and water vapor. These substances have the ability to absorb and emit radiation within the thermal infrared range, which in turn warms the atmosphere. Although nitrogen and oxygen are the most abundant gases in the atmosphere, they do not absorb significant amounts of the sun's energy compared to greenhouse gases. Dust particles in the atmosphere can also absorb some solar energy, but not as significantly as greenhouse gases do. Therefore, the correct answer to the given options would be: b. Carbon dioxide, water vapor, and dust.

Answer:Explained

Explanation:

Before Passing the another vehicle

Before passing another vehicle, the first major step is to ensure proper signaling and check blind spots. Signaling is crucial as it communicates your intention to the drivers behind and ahead of you.

Activating the turn signal in the direction you plan to pass alerts others of your intentions. Checking blind spots is equally important to ensure there are no vehicles present in the adjacent lanes that may be hidden from your mirrors.

This step involves a quick glance over your shoulder to verify that the lane is clear and safe for passing. Only after completing these steps should you proceed with passing the vehicle.

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For the measurement of the temperatures correctly the thermometers Should Fully dipped into Fluids  So that it is dipped into the Fluids and give you Correct reading.

Further Explanation:

Explanation:

First of all we should check that the liquid in the thermometer should be at below the room temperature. If it is not below this temperature please bring its temperature below the room temperature by shaking the thermometer.

When the temperature below the room Temperature:

When the Temperature of the thermometer is below the room temperature then dipped the thermometer into the fluid of which you have to checked the temperature. Make sure that the Thermometer dipped into the fluid properly.

Difficulties:

If thermometer is not dipped properly in the fluid then the temperature of fluid should not be measured correctly an there should be an error in the measurement.

When you take off the thermometer from the fluid then the Liquid in the thermometer can be leveled down because of sudden change of Temperature of the temperature of fluid to the room Temperature.

Answer Details:

Subject: Physics

Level: High School.

Key Words:

Explanation:

When the temperature below the room Temperature:

Difficulties:

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In the event of a boat motor catching fire, prioritize personal safety by ensuring lifejackets are worn, cut off the fuel source if possible, and use a fire extinguisher at the fire's base. If necessary, evacuate the boat.

The immediate actions if a boat motor catches fire should be focused on ensuring personal safety and then attempting to extinguish the fire. Firstly, ensure everyone on board is wearing a lifejacket for safety. Secondly, turn off the fuel source if possible to prevent the fire from spreading. Following this, use a fire extinguisher if one is available, aiming it at the base of the fire. Be cautious and prioritize evacuating the boat if the fire becomes uncontrollable.

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Final answer:

The distance below the top of the well is 806.4 meters. When taking into account the time for sound to travel up the well, the distance is 0 meters.

Explanation:

(a) To calculate the distance to the water, we can use the formula:

Distance = Speed of Sound x Time

Distance = 336 m/s x 2.40 s

Distance = 806.4 m

(b) To calculate the distance taking into account the time for sound to travel up the well, we subtract the time for sound to travel up:

Distance = (Speed of Sound x Time) - Speed of Sound x Time for Sound to Travel Up

Distance = 336 m/s x 2.40 s - 336 m/s x 2.40 s

Distance = 0 m

Newton’s 2nd law states that Force is equal to the product of mass (m) and acceleration (a):

F = m a                                  ---> 1

While in magnetic forces, force can also be expressed as:

F = q v B                               ---> 2

where,

q = total charge

v = velocity = 45 cm / s = 0.45 m / s

B = the magnetic field = 85 T

First we solve for the total charge, q:

q = 3.8 × 10^-23 g (1 mol / 23 g) (6.022 × 10^23 electrons / mol) (1.602 × 10^-19 C / electron)

q = 1.594 × 10^-19 C

We equate equations 1 and 2 then solve for acceleration a:

m a = q v B

a = q v B / m

a = [1.594 × 10^-19 C * 0.45 m / s * 85 T] / 3.8 × 10-26 kg

a = 160,437,862.2 m/s^2

Therefore the maximum acceleration of Na ions is about 160 × 10^6 m/s^2.

Answer:

[tex]a = 1.61 \times 10^8 m/s^2[/tex]

Explanation:

Force due to magnetic field on the position of Na+ ions is given as

[tex]F = qvB[/tex]

here we know that

[tex]q = 1.6 \times 10^{-19} C[/tex]

[tex]v = 45 cm/s[/tex]

[tex]B = 85 T[/tex]

now the force will be given as

[tex]F = (1.6 \times 10^{-19})(0.45)(85)[/tex]

[tex]F = 6.12 \times 10^{-18} N[/tex]

now we know that acceleration is given as

[tex]a = \frac{F}{m}[/tex]

[tex]a = \frac{6.12 \times 10^{-18}}{3.8 \times 10^{-26}}[/tex]

[tex]a = 1.61 \times 10^8 m/s^2[/tex]

Low sun angles spread sunlight over a larger area and through more of Earth's atmosphere, reducing its intensity. The Rosetta spacecraft observed this effect, receiving only 4% of the sunlight intensity experienced on Earth. Other phenomena, like solar activity and volcanic activity, can also impact solar energy on Earth's surface.

Low sun angles result in reduced solar energy due to a fundamental physics principle: the intensity of sunlight is spread over a larger area when it strikes the Earth at a more oblique angle. This occurs, for example, during winter when the Sun is low in the sky. As depicted in Figure 4.6, the Sun's rays spread out over a much wider area, becoming less effective at heating the ground. Moreover, when the sun is low in the sky, the sunlight must travel through more of the Earth's atmosphere, which can scatter the light, reducing the intensity of the sunlight that reaches the ground.

Another point to consider is the observed phenomenon reported by the Rosetta spacecraft at 800 million kilometres from the sun. Rosetta’s solar cells had to be specifically designed to function in these cold, low-light conditions as it receives only 4 percent of the light strength received on Earth.

However, while this explains the reduction in the intensity of solar energy at low angles, it's important to note that other phenomena, such as solar activity and volcanic aerosols, can also affect the global temperatures and solar energy received on Earth's surface.

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