In Figure , a 49kg rock climber is climbing a chimney. The coefficient of static friction between her shoes and the rock is 1.2; between her back and the rock is 0.80. She has reduced her push against the rock until her back and her shoes are on the verge of slipping. (a) Draw a free-body diagram of her. (b) What is the magnitude of her push against the rock? (c) What fraction of her weight is supported by the frictional force on her shoes?

Answer: 65 ohm

Explanation:

Answer:inertia

Explanation:

A car hits a tree and doesn’t stop, but keeps going until severely damaged. This is because of the principle of Inertia.

It states that" When a body s at rest it remains at rest, and IF the body is in motion It remains in motion until an external force is applied to that object."

i.e

If F=0, Then v= constant

and when that constant =0 then the body is at rest.

Where F= force

v = velocity.

Inertia is the tendency of an object to resist changes in its state of motion. In this case, the car was moving at a certain speed before it hit the tree, and because of its inertia, it continued to move forward even after the collision with the tree.

The car only stopped when another force acted on it, such as the force of the tree, or the force of friction with the ground, which slowed it down and eventually brought it to a stop. The severe damage to the car was a result of the force of the impact, which was a combination of the car's speed and its mass.

Hence the car does not stop because of the principle of inertia.

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The reason we are not normally aware of the gravitational or electric force between two ordinary objects is that these forces are very weak in comparison to other forces we commonly experience in everyday life.ExplanationGravitational and electric forces are two of the four fundamental forces of nature.

They play significant roles in determining the behavior of the universe, from the smallest subatomic particles to the largest structures in the cosmos.However, the gravitational and electric forces between two ordinary objects, such as a book and a table or two people, are typically so weak that we don't notice them in our daily lives.

This is because the strength of these forces depends on the masses and charges of the objects involved, as well as the distance between them. For example, the gravitational force between two people standing a few feet apart is only about one ten-billionth of the weight of a paperclip.In contrast, forces such as friction, air resistance, and normal forces are much stronger in comparison and can easily be felt or observed. For instance, when you walk on the ground, the force of friction between your shoes and the surface you're walking on is what keeps you from slipping and sliding. Similarly, the normal force between your feet and the ground helps support your weight and keep you standing upright.

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Sure! Here are the steps for calculating the velocity and distance traveled by the car after 50 seconds :

Step 1: Calculate the velocity using the equation:

\(v = u + at\)

where:

- \(v\) is the final velocity

- \(u\) is the initial velocity (0 m/s, as the car starts from rest)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(v = 0 + (3 \, \text{m/s²}) \times (50 \, \text{s})\)

Step 2: Calculate the distance traveled using the equation:

\(s = ut + \frac{1}{2}at^2\)

where:

- \(s\) is the distance traveled

- \(u\) is the initial velocity (0 m/s)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(s = 0 \times (50 \, \text{s}) + \frac{1}{2} \times (3 \, \text{m/s²}) \times (50 \, \text{s})^2\)

Now, let's simplify these equations:

\(v = 3 \times 50\)

\(s = \frac{1}{2} \times 3 \times 50^2\)

Calculating the results:

\(v = 150\) m/s

\(s = 3750\) meters

Therefore, after 50 seconds, the car will have a velocity of 150 m/s and would have traveled a distance of 3750 meters.

Answer:

对不起，我不知道对不起

Explenation:

The net force acting on the body is 45 N

Force is a vector, vectors are quantities that have both magnitude and direction. We must take the direction of the vector into account when computing the net force.

Since the two forces act in opposite directions, the net force is; 55 N - 10 N = 45 N.

The direction of this force is towards the 55 N force which is the larger force.

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To fill in the missing values for KE and GPE in the table, we can use the conservation of energy principle which states that the total mechanical energy of a system (ME) is conserved and remains constant as long as there are no external forces acting on the system.

At the maximum height of 3 m, the basketball is not moving, so all of its energy is potential energy, i.e., GPE = 18 J and KE = 0 J.

Using the principle of conservation of energy, we can calculate the values of KE and GPE at the other heights:

At a height of 2 m, the basketball has lost some potential energy as it has moved down, but it has not gained any kinetic energy yet, so KE = 0 J. Therefore, GPE = 12 J.

At a height of 1 m, the basketball has lost some potential energy and gained some kinetic energy. We can calculate the KE as the difference between the ME at heights of 2 m and 1 m, i.e., KE = ME(2 m) - ME(1 m) = (12 J) - (6 J) = 6 J. Therefore, GPE = 6 J.

At a height of 0 m, the basketball has lost all of its potential energy and gained an equal amount of kinetic energy, i.e., KE = GPE = 18 J.

The mechanical energy (ME) at each height can be calculated as the sum of KE and GPE:

ME(3 m) = KE + GPE = 0 J + 18 J = 18 J

ME(2 m) = KE + GPE = 0 J + 12 J = 12 J

ME(1 m) = KE + GPE = 6 J + 6 J = 12 J

ME(0 m) = KE + GPE = 18 J + 0 J = 18 J

Therefore, the mechanical energy of the basketball remains constant at 18 J at the maximum height and at the ground level, and decreases to 12 J at a height of 2 m and then increases back to 18 J at a height of 0 m.

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The momentum of an electron moving with a speed of 0.900c is calculated using the relativistic momentum formula.

The momentum of an object is defined as the product of its mass and velocity. In classical physics, the momentum of an object can be calculated using the equation p = mv, where p is the momentum, m is the mass, and v is the velocity. However, when dealing with objects moving at speeds close to the speed of light (c), relativistic effects come into play.

According to Einstein's theory of relativity, the momentum of an object moving at relativistic speeds can be calculated using the relativistic momentum formula:

p = γm0v

where p is the momentum, m0 is the rest mass of the object, v is the velocity, and γ (gamma) is the Lorentz factor, given by:

γ =\(\frac{1}{\frac{v^{2} }{c^{2} } }\)

In this case, the electron is moving with a speed of 0.900c, where c is the speed of light. Substituting the values into the formula, we can calculate the momentum of the electron. It's important to note that the rest mass of an electron is approximately 9.11 x 10^-31 kilograms.

By plugging in the values into the relativistic momentum formula, we find:

γ =\(\frac{1}{\sqrt{\frac{1-(0.900c)^{2} }{c^{2} } } }\)

= \(\frac{1}{\sqrt{(1-0.81)} } }\)

=\(\frac{1}{\sqrt{0.19} }\)

= 2.30

Now, we can calculate the momentum:

p = γm0v

≈ \((2.30)(9.11\)×\(10^{-31} kg)(0.900c)\)

≈ \(1.79\) × \(10^{-24} kg.m/s\)

Therefore, the momentum of an electron moving at a velocity of 0.900 c is approximately 1.79 x 10^-24 kg m/s. Relativistic effects become significant at high speeds, and the relativistic momentum formula  more accurately describes the momentum in such cases.

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Answer: Most aerobic and strength training programs cause your muscles to contract and tighten. So stretching after you exercise helps optimize the range of motion about your joints and boosts circulation.

Hope this helps!

Answer:

economics frames many choices we have to make about work, leisure, consumption and how much to save.

Explanation:

Answer:

Electric field of particles with opposite charges

Structures or regions of atoms interact in atoms bond to form molecule due to electric fields of particles with opposite charges.

The electric field is the field, which is surrounded by the electric charged. The electric field is the electric force per unit charge.

Atoms bond forms molecules, when more than one atoms are chemically bond jointly.

The atoms of outer bond, form the electron in the following ways,

One atom or ion, detain to another atom, then their electron posses opposite or repulsive force on each other.

Thus, the structures or regions of the atoms interact in atoms bond to form molecule due to electric fields of particles with opposite charges.

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Answer:

See below

Explanation:

Vertical position = 45 +  20 sin (30) t  - 4.9 t^2

 when it hits ground this = 0

               0 = -4.9t^2 + 20 sin (30 ) t + 45

                0 = -4.9t^2 + 10 t +45 = 0     solve for t =4.22 sec

  max height is at  t= - b/2a = 10/9.8 =1.02

     use this value of 't' in the equation to calculate max height = 50.1 m

      it has  4.22 - 1.02 to free fall = 3.2 seconds free fall

           v = at = 9.81 * 3.2 = 31.39 m/s VERTICAL

      it will also still have horizontal velocity =  20 cos 30 = 17.32 m/s

        total velocity will be sqrt ( 31.39^2 + 17.32^2) = 35.85 m/s

Horizontal range = 20 cos 30  * t  =  20 *  cos 30  * 4.22 = 73.1 m

As rain falls from the sky and hits the ground, its momentum decreases, and its energy is dissipated into various forms.

When rain falls from the sky, it possesses both momentum and energy due to its motion. As it hits the ground, several factors come into play.

1. Momentum: Momentum is a product of an object's mass and velocity. When raindrops fall, they have a certain momentum associated with their mass and downward velocity. Upon impact with the ground, the raindrops' momentum decreases or comes to a stop. This change in momentum is caused by the force exerted on the raindrops by the ground.

2. Energy: Raindrops also possess kinetic energy due to their motion. Upon impact, some of this kinetic energy is converted into other forms, such as sound energy, heat energy, and the energy required to displace the ground and surrounding air. The conversion of kinetic energy into these different forms leads to a decrease in the raindrop's overall energy.

3. Energy dissipation: The energy of the falling raindrop is dissipated into the surrounding environment. For example, the sound energy is produced due to the impact and creates the sound of rain hitting the ground. Heat energy is generated by the friction between the raindrop and the ground, as well as the air resistance encountered during the fall. Some energy is also used to displace the ground and the air around the impact area.

In summary, when rain falls and hits the ground, its momentum decreases, and its energy is dissipated into various forms, including sound energy, heat energy, and the energy required to displace the ground and surrounding air.

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Since the ideal gas' internal energy is only dependent on temperature, it does not change during the isothermal process. Heat exchanged equals work completed.

In physics, the term "work" refers to the energy that is moved to or away from an item whenever a force is exerted along a displacement. For a constant force that is directed in the same direction as the motion, it is simplest expressed as the product of the force's magnitude and the distance traveled. The work performed by a force is defined as the product of the component of the force operating in the direction of the displacement and the displacement's magnitude. Formula. Work can be calculated using the formula below by multiplying force by the distance traveled in the force's direction. W = F × d.

The term "nature of work" refers to the kinds of tasks and responsibilities that may be assigned to you at work. The caliber of the work might demonstrate your qualifications and place within a corporation. The type of work and the level of work may be listed as the job description and the job title, respectively, when you look at job openings.

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The e+ in the diagram represents an antimatter particle.

An electron is a matter particle, whereas a positron is its antimatter counterpart. Positrons have a positive charge, while electrons have a negative one. Additionally, the magnetic moments of an electron and positron are in opposition.

Antimatter is a substance made up of subatomic particles with the mass, electric charge, and magnetic moment of electrons, protons, and neutrons in regular matter, but with the opposite signs for these three properties.

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Answer:

The deviation of a mirror is equal to twice the angle of incidence.The total angle between the straight-line path and the reflected ray is twice the angle of incidence. This is called the deviation of the light and measures the angle at which the light has strayed from its initial straight-line path.

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The further a planet is from the Sun, the colder its surface temperatures tend to be. Venus is an exception, since it has the highest surface temperature in our solar system due to its close closeness to the Sun and its thick atmosphere.

The inner planets are rocky, whereas the outer planets are gaseous, which can be attributed to the early solar system's temperature. The solar system's temperature increased as the gases came together to create a protosun. Temperatures in the inner solar system reached 2000 K, whilst in the outer solar system, it was only 50 K.

The quantity of heat received is just one of many intricate aspects that go into determining the temperature.

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Answer:

Simple machines can actually make more work due to friction. Simple machines make work easier to do by decreasing the force required by increasing the distance over which the work is done. _____increasing___ the distance that force is applied.

Answer:

weight =m x g =2kg × 10m/s 2 = 20N

weight = m × gravity

=unit for weight is newtons

Mass=weight ÷ gravity

= unit for mass is kilograms

Gravity=weight ÷ mass

=unit for gravity is 10m/sec 2

Answer:

the answer is C ----- it is the rate of change of velocity per unit time

Explanation:

acceleration

\( = \frac{velocity(v)}{time(t)} \)

Answer:

the second process of using the the shovel to move the snow as it takes a longer time meaning more power is expended

In this scenario, the red team hits the ball over the net in 2 hits and it hits the floor 2 times before the blue team can hit the ball. Based on the given information, the red team would earn 2 points.

1. The red team hits the ball over the net in 2 hits. This means that the red team successfully makes the ball go over the net within 2 hits.

2. The ball then hits the floor 2 times before the blue team can hit it. This means that the ball bounces on the floor twice before the blue team has a chance to make a hit.

Since the red team successfully hits the ball over the net and it hits the floor twice before the blue team can make a hit, the red team would earn 2 points.

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A force of 15 Newton stretches a spring to a total length of 30 cm and an additional force of 10 Newton's stretches to a Spring of 5 cm, the natural length of the spring is 58.5 cm

To find the natural length of the spring, we can use Hooke's law, which states that the force applied to a spring is directly proportional to the displacement of the spring from its natural length.

Let's denote the natural length of the spring as L.

According to the problem, a force of 15 Newton stretches the spring to a total length of 30 cm. This means that the displacement of the spring is 30 cm - L.

Using Hooke's law, we can set up the following equation:

Force = k * Displacement

where k is the spring constant.

For the first scenario, we have:
15 N = k * (30 cm - L)

Next, we are given that an additional force of 10 Newton's stretches the spring to a length of 5 cm. This implies that the displacement of the spring is 5 cm - L.

Using Hooke's law again, we can set up the following equation:

10 N = k * (5 cm - L)

Now we have two equations:

15 N = k * (30 cm - L)
10 N = k * (5 cm - L)

We can solve this system of equations to find the value of L, the natural length of the spring.

By dividing the second equation by 10, we get:

1 N = k * (0.5 cm - 0.1L)

Rearranging the equation, we have:

1 N = 0.5 k - 0.1kL

Now, let's substitute the value of k from the first equation into this equation:

1 N = 0.5 (15 N / (30 cm - L)) - 0.1 (15 N / (30 cm - L)) * L

Simplifying the equation, we get:

1 = 0.75 / (30 cm - L) - 1.5L / (30 cm - L)

Combining the terms on the right side of the equation, we have:

1 = (0.75 - 1.5L) / (30 cm - L)

Cross-multiplying, we get:

30 cm - L = 0.75 - 1.5L

Simplifying the equation, we have:

L - 1.5L = 0.75 - 30 cm

Combining like terms, we get:

-0.5L = -29.25 cm

Dividing both sides of the equation by -0.5, we get:

L = 58.5 cm

Therefore, the natural length of the spring is 58.5 cm.

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Answer:

117

Explanation:

the formula is P1V1 over T1 is equals to P2V2 over T2

Answer:

C. amount of charge on the source charge.

Explanation:

Electric field lines can be defined as a graphical representation of the vector field or electric field.

Basically, it was first introduced by Michael Faraday and it is typically a curve drawn to the tangent of a point is in the direction of the net field acting on each point.

The number, or density, of field lines on a source charge indicate the amount of charge on the source charge. Therefore, the density of field lines on a source charge is directly proportional to quantity of charge on the source.

We want to compare the gravitational acceleration of different planets by using the given table. The correct option is the last one, so we have:

Planet Y, planet W, planet Z, planet X.

First, we know that the velocity equation is written as:

V(t) = a*t + v₀

Where a is the acceleration and v₀ is the initial velocity.

With this equation, we can find the acceleration in each planet.

Planet W

The initial velocity is v₀ = -3m/s

V(t) = a*t - 3m/s

And we know that at t = 2s, the velocity is -22m/s.

v(2s) = -22m/s = a*2s - 3m/s

           -22m/s + 3m/s = a*2s

           -19 m/s = a*2s

           (-19 m/s)/2s = a = -9.5m/s^2

Now we just do the same thing for each planet.

Planet X:

v₀ = -0.5 m/s

v(1s) = -4.2 m/s = a*1s - 0.5 m/s

          -4.2 m/s + 0.5 m/s = a*1s

          -3.8 m/s^2 = a

Planet Y:

v₀ = 0 m/s

v(2s) = -21 m/s = a*2s

           (-21 m/s)/2s = a = -10.5 m/s^2

Planet Z:

v₀ = 0 m/s

v(1s) = -8 m/s = a*1s

          (-8 m/s)/1s = a = -8m/s^2

Then the order from greatest to least is:

Y, W, Z, X

So the correct option is the last one.

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The type of galaxy which has arms that contain sites of active star formation and start close to a bulge in the center is: D. normal spiral.

A star can be defined as a giant celestial (astronomical) object that is made up of a luminous sphere of plasma bounded together by its own gravitational force.

Generally, a star comprises two (2) main interstellar hot gases and these include:  

I. Hydrogen (H).

II. Helium (He).

A galaxy refers to a collection of billions of stars, which are existing independently.

This ultimately implies that, the greatest number of stars are found in a galaxy.

According to astronomers, the galaxy is classified into four (4) main categories and these are:

Furthermore, spiral galaxies are divided into two (2) major groups such as:

I. Barred spiral.

II. Normal spiral.

A normal spiral is typically made up of arms containing sites of active star formation and it start close to a bulge in the center.

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Answer:

D) normal spiral

Explanation:

Whoever answered it practically wrote a life story. There's no need for an explanation; just get to the point and tell us the answer. But anways, the answer is D.

Reflection is the process of thinking about something and analyzing it in relation to one's own experiences and perspectives.

In the context of the law of acceleration, this means considering how this law affects our everyday lives and the decisions we make.

One way that the law of acceleration relates to my life is through my use of technology. The law of acceleration states that an object's acceleration is directly proportional to the net force acting on it and inversely proportional to its mass.

This means that as technology becomes more advanced and lighter in weight, it also becomes faster and more efficient. This directly affects my daily life, as I rely on technology for communication, entertainment, and work.

Another way that the law of acceleration relates to my life is through my experiences with transportation. Whether I am driving a car, riding a bike, or taking public transit, the law of acceleration is at play. Understanding how acceleration works allows me to make informed decisions about how to safely and efficiently get from one place to another.

Overall, the law of acceleration is a fundamental principle that affects many aspects of our daily lives. By reflecting on how it relates to my own life, I can better understand the world around me and make more informed decisions.

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