Newtons thrid law of motion describes?

Final answer:

The resultant speed of the boat as it crosses the river, considering both its own speed and the river's current speed, is calculated using the Pythagorean theorem, resulting in a resultant velocity of 10.0 m/s.

Explanation:

The student's question revolves around determining the resultant velocity of a boat trying to cross a river when it rows at a certain speed perpendicular to the river's current. Given that Diane rows the boat at 8.0 m/s directly across a river, which has a flow speed of 6.0 m/s, we are tasked with finding the resultant speed of the boat. This scenario is a practical example of vector addition where the boat's speed and the river's flow speed are orthogonal (right angle to each other).

To find the resultant velocity, we apply the Pythagorean theorem since the velocities are perpendicular. The formula is:

Resultant velocity (v) = √(vboat2 + vriver2)

Where boat is the velocity of the boat relative to the water (8.0 m/s), and river is the velocity of the water (6.0 m/s).

By substituting the given values:

v = √((8.0)2 + (6.0)2) = √(64 + 36) = √100 = 10.0 m/s

Therefore, the resultant speed of the boat as it crosses the river is 10.0 m/s.

Answer:

The BMI of a person whose weight is 180 lb and whose height is 75 inches is 22.

Explanation:

According to question , BMI is directly proportional to weight in pounds and inversely proportional to the square of height inches.

[tex]BMI\propto \frac{w}{h^2}[/tex]

[tex]BMI=k\times \frac{w}{h^2}[/tex]

BMI = body mass index

w = weight of person in pounds

h = height of the person inches.

BMI of a​ 6-foot-tall person weighing 177 lb = 24

w = 177 lb , h = 6 feet = 72 inches

1 feet = 12 inches

[tex]24=k\times \frac{177 lb}{(72 inches)^2}[/tex]

[tex]k=\frac{24\times (72 inches)^2}{177 lb}[/tex]

BMI of a​ 75 inhces person weighing 180 lb = BMI'

w = 180 lb , h = 75 inches

[tex]BMI'=k\times \frac{180 lb}{(75 inches)^2}[/tex]

Substitute value 'k' calculated above:

[tex]BMI'=\frac{24\times (72 inches)^2}{177 lb}\times \frac{180 lb}{(75 inches)^2}[/tex]

[tex]BMI'=22.493\approx 2[/tex]

The BMI of a person whose weight is 180 lb and whose height is 75 inches is 22.

The BMI of a person weighing 180 lbs with a height of 75 inches is approximately 23.

The Body Mass Index (BMI) is calculated by dividing a person's weight in pounds by their height in inches squared, then multiplying by 703.

Given that BMI is directly proportional to weight and inversely proportional to the square of height, let's determine the BMI for a person weighing 180 lbs and height 75 inches.

We can use the given information to set up the formula:

First, calculate the BMI for the provided example:

Now, calculate the BMI for the new values:

Rounding to the nearest whole number, the BMI is 23.

First convert the speed of mosquito to m/s:

So the mosquito is flying at (2,400/3,600) m/s, or ⅔ m/s. 

Since you are moving at 2m/s, so this makes the closing velocity between you and the mosquito to be 2⅔ m/s. 

Neptune is eighth the farthest planet from the Sun. It is about 2.8 billion miles (4.5 billion km) away. Neptune appears to look blue because of the gas in its atmosphere. Neptune has at least 14 known moons. Triton is Neptune's largest moon. Triton has volcano-like eruptions that burst from openings in the surface.

Final answer:

On the Moon, your mass of 54 kilograms would not change, but your weight would decrease to approximately 19.84 pounds due to the lower gravitational pull of the Moon which is 1.625 m/s².

Explanation:

If your weight is 120 pounds on Earth and your mass is 54 kilograms, your mass will remain the same on the Moon, but your weight will change because the Moon's gravitational pull is weaker. The acceleration due to gravity on the Moon is approximately 1.625 m/s², compared to Earth's 9.80 m/s². To calculate your new weight on the Moon, you can use the ratio of the Moon's gravity to Earth's gravity.

First, convert your weight from pounds to Newtons (N) to get the force of gravity on Earth. Then, multiply this force by the ratio of the Moon's gravity to Earth's gravity (1.625/9.80). Finally, convert back to pounds to find your weight on the Moon.

On the Moon, you would weigh roughly 19.84 pounds, but your mass of 54 kilograms would remain unchanged.

Answer:

0

Explanation:

a. The force applied would be equal to the frictional force.

F = us Fn

where, F = applied force = 35 N, us = coeff of static friction, Fn = normal force = weight

35 N = us * (6 kg * 9.81 m/s^2)

us = 0.595

b. The force applied would now be the sum of the frictional force and force due to acceleration

F = uk Fn + m a

where, uk = coeff of kinetic friction

35 N = uk * (6 kg * 9.81 m/s^2) + (6kg * 0.60 m/s^2)

uk = 0.533

The coefficient of static friction between the box and the floor is 0.60

The value of coefficient of kinetic friction is 0.061

Given data:

The magnitude of force to start the box is, F = 35.0 N.

The mass of box is, m = 6.0 kg.

The magnitude of acceleration is, [tex]a = 0.60 \;\rm m/s^{2}[/tex].

(a)

The force due to static friction is given as,

[tex]f = \mu mg[/tex]

Here, [tex]\mu[/tex] is the coefficient of static friction.

Solving as,

[tex]35.0= \mu \times 6 \times 9.8\\\mu \approx 0.60[/tex]

Thus, the coefficient of static friction between the box and the floor is 0.60.

(b)

If box accelerates, the frictional force comes to play to oppose the motion. Therefore,

[tex]f = F\\\mu_{k} \times m\times g = ma\\\mu_{k}\times g = a\\\mu_{k}\times 9.8 = 0.60\\\mu_{k} = 0.061[/tex]

Thus, the value of coefficient of kinetic friction is 0.061.

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Answer:Governments can pass laws about scientific research

Explanation:

Earth's magnetic field protects from solar wind, aids navigation with a compass, and creates the Aurora Borealis. the correct options are c & d.

Earth's magnetic field protects humans from harmful solar wind by deflecting most of it, preventing damage to life on Earth. The magnetic field also aids navigation through the use of a compass, guiding people in finding direction accurately.

The Aurora Borealis, or Northern Lights, is an awe-inspiring light display resulting from disturbances within Earth's magnetic field caused by solar storms.

Isotopes, which are atoms of the same element with different numbers of neutrons, cause atomic masses to be non-whole numbers since atomic mass is a weighted average of the isotope masses based on their abundances.

The existence of isotopes is directly related to atomic masses not being whole numbers. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons, leading to different mass numbers. The atomic mass of an element is the weighted average of the masses of its isotopes, based on their relative abundance. This is why atomic masses on the periodic table are not whole numbers.

For example, chlorine has two main isotopes with mass numbers of 35 (17 protons and 18 neutrons) and 37 (17 protons and 20 neutrons). The atomic mass of chlorine is 35.45, which reflects the weighted average of these isotopes, with the more abundant isotope having a greater influence on the final atomic mass.

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Impulse is the variance of the momentum of a thing when the thing is operated upon by a force for an interval of time. Following are the possible formulas for impulse as;

Momentum is product of mass and velocity. According to newton’s second law, F =ma is by putting values of acceleration (a = ( vf - vi ) / t. Therefore, F =( m v ) / t. F t = m v and F t is impulse.

J = Ft

J = mv

J = p

This problem involves a bird flying with a force of 11N against an air resistance of 2N. In the vector diagram, the bird's force is represented as an upward arrow of length 11, and the air resistance as a downward arrow of length 2. The net force is 9N, represented by an upward arrow of length 9, which indicates the direction and strength of the bird's motion.

In this problem, a bird is flying north with a force of 11N while the air resistance is posing a force of 2N. Given the directions, we should make a vector diagram. A vector is characterized by both magnitude (in this case, the strength of force) and direction. The magnitude is the length of the vector, while the direction shows the way the force is applied.

Let's assume the northward direction is upward. You can represent the bird's motion as an upward arrow of length 11. This represents the 11N force north. The force due to air resistance, being 2N, can be represented as a downward arrow of length 2, indicating it's acting in the opposite direction to the bird's motion.

The net force is the vector sum of these two forces. Since they are in opposite directions, you subtract the smaller from the larger, giving a net force of 9N (11N bird's force - 2N air resistance). This net force can be represented by an upward arrow of length 9, indicating the bird still continues its movement to the north.

The displacement is the distance and direction the bird has moved. This will depend on the time the bird has been flying and is not indicated in the question.

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The magnitude of the resulting acceleration is 0.265 m/sec².

The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.

The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.

Given the magnitude of the vectors f~ is 27 n, the force on the right is applied at an angle 58◦ and the the mass of the block is 54 kg. 54 kg f 58 ◦ f if the surface is friction less,

F cos(58) = ma

14.30 = 54.a

a = .265 m/sec²

The magnitude of the resulting acceleration is 0.265 m/sec².

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The average speed of the ball as it rolls 10 meters is 8.33 meters per second.

The average speed of the ball as it rolls the 10 meters can be found by dividing the total distance traveled by the total time taken. In this case, the ball rolls 6.0 meters while its speed changes from 15 meters per second to 10 meters per second. The time taken to roll this distance can be calculated by using the formula:

Time = Distance / Speed

Substituting the given values:

Time = 6.0 meters / (15 meters per second - 10 meters per second) = 6.0 meters / 5 meters per second = 1.2 seconds

The average speed of the ball is therefore 10 meters / 1.2 seconds = 8.33 meters per second.

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To determine the distance along the surface of the incline that the block slides before coming to rest, use the equations of motion. Find the acceleration using Newton's second law and then use the equation of motion to find the distance.

To determine the distance along the surface of the incline that the block slides before coming to rest, we can use the equations of motion. Since the incline is frictionless, the only force acting on the block is its weight component parallel to the incline. The acceleration of the block can be found using Newton's second law, and then we can use the equation of motion to find the distance.

First, let's find the acceleration. The weight component parallel to the incline is given by:

FPARALLEL = m x g x sin(theta)

where m is the mass of the block, g is the acceleration due to gravity, and theta is the angle of the incline.

Next, we can use Newton's second law to determine the acceleration:

m x a = FPARALLEL

a = PARALLEL / m

Once we have the acceleration, we can use the equation of motion to find the distance (s) traveled by the block:

s = (v02 - v2) / (2 x a)

where v0 is the initial velocity of the block and v is the final velocity (zero in this case, as the block comes to rest).

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Yes the answer is A

Answer: A

Answer: 117

Explanation:

The correct choice is (C) later middle years

Later middle years is almost 30 to 40 years of a person's life. It is the most critical period of life because every person wants to get a successful life i this stage. We marry in this age and due to certain failures people get divorced too. Some people lose their jobs due to various reasons and many people also suffer from high debts because they want to stabilize themselves by starting a business if they don't get a suitable job.

The correct answer is (C) the type of groups we associate with when we become adults

It is better said that a man is known by the company he keeps. So therefore it is a proven fact that all people are mostly influenced by their friends and social circle where they spend most of their time. The life style that we get and the behavior that we show is dependent upon the social circle and family members where we live. Therefore as we move in our lives the events we experience are largely influenced by the type of groups we associate with when we become adults