Question 2 of 27
A man is trying to drag a small tree that he cut down. If the static coefficient
of friction of the tree on the ground is 0.5 and the tree weighs 670 N, what is
the minimum amount of horizontal force that the man will need to apply so
that the tree will start moving?
A. 670 N
B. 230 N
C. 335 N
D. 465 N

Answer:

m

Explanation:

Metres, m, is the SI unit of length

Hope this helped you-have a good day bro cya)

Because of the cosmological principle, we can predict gravity works similarly on Earth as on Mars.

The cosmological principle says that an observer's view of the universe is independent of both the direction he looks and his location. This principle only applies to the universe's large-scale properties, but it does suggest that the world has no edge, implying that the big-bang origin took place not at a specific point in space, but instead throughout space at the exact time.

These two assumptions allow us to determine the history of the universe after a specific epoch known as the Planck time. Scientists are yet to discover what existed prior to Planck time.

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Value analysis is a method used to evaluate the worth and effectiveness of an organization or project.

In the case of DEWA (Dubai Electricity & Water Authority), conducting a value analysis can provide insights into the overall value created by the organization. Here are some key points to consider in a value analysis of DEWA:

1. Service Quality: Evaluate the quality and reliability of the electricity and water services provided by DEWA. Assess factors such as uptime, response time, customer satisfaction, and the overall impact on the daily lives of residents and businesses in Dubai.

2. Cost Efficiency: Analyze the cost-effectiveness of DEWA's operations, including the generation, transmission, and distribution of electricity, as well as water production and distribution. Assess the efficiency of resource utilization, cost management practices, and the impact on consumer tariffs.

3. Sustainability: Evaluate DEWA's commitment to sustainable practices, such as renewable energy integration, water conservation efforts, and environmental stewardship. Assess the organization's contributions to reducing carbon emissions and promoting a greener future.

4. Innovation and Technology: Assess DEWA's adoption of innovative technologies, such as smart grids, advanced metering systems, and digital solutions. Evaluate the impact of these technologies on service delivery, efficiency, and customer experience.

5. Stakeholder Engagement: Analyze DEWA's relationships with stakeholders, including customers, suppliers, government entities, and the community. Assess the effectiveness of communication, collaboration, and the organization's contribution to social and economic development in Dubai.

By conducting a comprehensive value analysis of DEWA, stakeholders can gain a holistic understanding of the organization's performance, impact, and value proposition. This analysis can guide decision-making, identify areas for improvement, and support DEWA's ongoing efforts to provide reliable, sustainable, and affordable electricity and water services to the residents and businesses of Dubai.

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Answer:

9 m/s

Explanation:

speed = distance ÷ time

27÷3

=9

A change in temperature frequently causes substances to change phases. Most substances are solid at low temperatures; as the temperature rises, they become liquid; and at still greater temperatures, they become gaseous.

Melting is the conversion of a solid into a liquid (an older term that you may see sometimes is fusion). Solidification is the process where a liquid turns into a solid. The melting point, or the temperature at which a pure substance begins to melt, is a property of that substance. A solid must expend energy to become a liquid. A specific quantity of energy is required by every pure substance in order to transform from a solid to a liquid. This amount is known as the substance's enthalpy of fusion (or heat of fusion).

The complete question is- The diagram shows how states of matter can change when energy is either added or removed.

System before change

System after change

00000

00000

00000

00000

00000

00000

00000

All of these statements below are true EXCEPT

Energy was added to the matter causing the particle movement to increase.

The matter changed states which is a physical change.

The particles in the matter before the change had more energy than after the change.

The particles in the matter before the change had less energy than after the change.

the diagram is attached below.

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Answer:

IDC

Explanation:

I DON'T UNDERSTAND........

Answer:

U = 66,150 J

Explanation:

Gravitational Potential Energy

Gravitational potential energy is the energy stored in an object because of its vertical position or height in a gravitational field.

It can be calculated with the equation:

U=m.g.h

Where m is the mass of the object, h is the height with respect to a fixed reference, and g is the acceleration of gravity or \(9.8\ m/s^2\).

The child of mass m=45 Kg is perched above a h=150 m ravine. His gravitational potential energy is:

\(U=45~Kg\cdot 9.8\ m/s^2\cdot 150\ m\)

U = 66,150 J

A star is considered circumpolar if it remains above the horizon throughout the entire night. The greatest distance that a star can be from Polaris, the North Star, and still be circumpolar is 50°.

Circumpolar stars are those that do not set below the horizon but instead appear to revolve around the celestial pole. In the northern hemisphere, Polaris serves as the North Star, located very close to the celestial north pole.

For a star to be circumpolar as seen from Philadelphia (latitude 40.0°), it must remain above the horizon at all times during the night.

The distance between Polaris and the celestial pole is equivalent to the observer's latitude. In this case, since the latitude of Philadelphia is 40.0°, any star within 40.0° of Polaris will be circumpolar.

Therefore, the greatest distance a star can be from Polaris and still be circumpolar is 40.0° + 10.0° (as the North Star is approximately 10.0° away from the celestial pole), giving a total of 50.0°.

Any star within this range, up to 50.0° from Polaris, will never dip below the horizon and will remain visible throughout the entire night as a circumpolar star.

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The efficiency of a 10 hp DC motor that draws 31 A at 300 volts is equal to 80 %.

The efficiency of a motor can be calculated from the ratio of the mechanical power output to the electric power input to the motor.

Given the horsepower of the DC motor = 10 hp

Conver the hp into watt:

1hp = 745.7 W

Output power = 10 hp = 10× 745.7 = 7457 W

Input power = 31 × 300 = 9300 W

The efficiency of the motor = Output/Input ×100

Efficiency = (7457/9300) ×100 = 80 %

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A class 1 power-limited circuit shall be supplied by a source that has a rated output of not more than 30 volts and 1000 volt-amperes.

A circuit is a loop in which current can move. The energy needed for the circuit to function comes from a power source, like a battery. In a circuit, electrons move from a power source's negative side to its positive side before returning to the negative side. The circuit is complete once the electrons have gone back to the power source.

Electrons for powering the circuit are supplied by the voltage source, which also serves as its electron source. Electric connections like outlets and batteries are common sources of voltage.

The load is what uses the energy that the voltage source produces. Loads are what cause a circuit to operate in various ways, such as by making a sound or lighting up.

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Answer:

1.45 N

Explanation:

Newton's Second Law: F=ma

Convert 145 grams to kilograms

0.145kg*10m/s^2

1.45 N

The advice the interviewee offered for students interested in his/her career was to be hardworking and persistent.

This is referred to as the chosen profession or occupation of an individual and is characterized by the individual taking the required courses or training which are needed in the execution of the tasks related to it.

The advise which was offered to the students was to be hardworking and persistent as there are lots of challenges and obstacles which one will face on the journey and will help overcome them and achieve the desired result in practicing the career.

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Answer:

D. Place mirrors at both A and E

Explanation:

Answer:

a. 10 years

b. 6 years

c. 12 years behind

Explanation:

speed of light c =  3x\(10^{8}\) m/s

distance of sirius from earth = 8 lightyears = 8 x c x 60 x 60 x 24 x 365 = 252288000c meters

speed of spaceship = 0.8c

time taken to reach sirius = distance covered divided by speed

t = d/s = 252288000c/0.8c = 315360000 sec

1 year = 60 x 60 x 24 x 365 sec = 31536000 sec

315360000 sec = 315360000/31536000 = 10 yrs

the time as observed by Goslo will be shorter than the real time as measured within the ship due to relativistic effects. using the relativistic relation for time dilation we have

t' = t\(\sqrt{1 - \frac{v^{2} }{c^{2} } }\)

since v = 0.8c

v/c = 0.8

where t' is the relativistic time as observed by Goslo,

t is the time within the ship

t' = 10 x \(\sqrt{1 - 0.8^{2} }\)  = 6 yrs

If speedo turns around immediately after reaching  sirius, his total distance will be 252288000c x 2 = 50457600c meter

time taken = 50457600c/0.8 = 630720000 sec = 20 yrs

time within the ship will be calculated from time dilation

t' = t\(\sqrt{1 - \frac{v^{2} }{c^{2} } }\)

t' = 20 x  \(\sqrt{1 - 0.8^{2} }\)  = 378432000 sec = 12 years behind

Answer:

the work done by the worker in pulling the crate is 500 J, and the kinetic energy of the crate at the end of the 10 m distance is 292.13 J.

Explanation:

To solve the problem, we need to first resolve the applied force and the frictional force into their horizontal and vertical components. The horizontal component of the applied force is:

F_h = Fcos(30°) = 50cos(30°) = 43.3 N

The vertical component of the applied force is:

F_v = Fsin(30°) = 50sin(30°) = 25 N

The frictional force is acting in the opposite direction to the applied force, so its horizontal component is:

f_h = -F_f = -20 N

Since the crate is initially at rest, the net force on the crate is equal to the applied force minus the frictional force:

F_net = F_h + f_h = 43.3 - 20 = 23.3 N

The acceleration of the crate is given by Newton's second law:

F_net = ma

where a is the acceleration of the crate. Rearranging this equation, we get:

a = F_net/m = 23.3/30 = 0.78 m/s²

The work done by the worker in pulling the crate a distance of 10 m is given by:

W = Fdcos(θ)

where d is the distance pulled, and θ is the angle between the applied force and the displacement. In this case, θ = 0° since the force is applied horizontally. Therefore, the work done is:

W = Fd = 5010 = 500 J

The kinetic energy of the crate at the end of the 10 m distance is:

K = (1/2)mv²

where v is the final velocity of the crate. We can find v using the equation of motion:

v² = u² + 2as

where u is the initial velocity (zero), s is the displacement (10 m), and a is the acceleration (0.78 m/s²). Therefore:

v² = 0 + 20.7810 = 15.6

v = sqrt(15.6) = 3.95 m/s

Substituting this value of v into the equation for kinetic energy, we get:

K = (1/2)mv² = (1/2)30(3.95)² = 292.13 J

Therefore, the work done by the worker in pulling the crate is 500 J, and the kinetic energy of the crate at the end of the 10 m distance is 292.13 J.

Answer:

1)force:- force is an external affert by any body on an object.

2) force and motion are related to each other. force helps to create motion in any object.

3) frictional force

4) Newton

At point C of a pendulum's motion, kinetic energy is converted back into potential energy.

As the pendulum bob moves upward from the lowest point of its swing, its speed decreases and its potential energy increases. At point C, the pendulum bob has stopped momentarily, so it has no kinetic energy. However, it has gained potential energy as a result of its increased height. As the pendulum bob continues to move upward towards point D, its potential energy will continue to increase, while its kinetic energy decreases.

Therefore, the correct answer is D, Kinetic energy is converted to potential energy.

What is  potential energy?

Potential energy is a form of energy that an object possesses due to its position or configuration in a system. It is the energy that an object has because of its position relative to other objects, or because of the forces acting on it.

What is kinetic energy?

Kinetic energy is the energy that an object possesses due to its motion. It is a form of energy that an object has because of its speed and mass. The formula for kinetic energy is:

KE = 1/2 * m * v^2

where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object.

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Answer:

sound waves

light waves

transverse waves

longitudinal waves

Answer:

Sound waves

Heat waves

Mechanical waves

Transverse waves

Longitudinal waves

The algebraic signs of Alex's x velocity and y velocity the instant before he safely lands on the other side of the crevasse depend on the direction of his motion.

Let's consider the x direction first. If Alex is moving towards the right side of the crevasse, his x velocity would be positive. Conversely, if he is moving towards the left side of the crevasse, his x velocity would be negative.

Now let's focus on the y direction. If Alex is moving upwards as he jumps across the crevasse, his y velocity would be positive. On the other hand, if he is moving downwards, his y velocity would be negative.

In summary,
- If Alex is moving towards the right side of the crevasse, his x velocity is positive.
- If Alex is moving towards the left side of the crevasse, his x velocity is negative.
- If Alex is moving upwards, his y velocity is positive.
- If Alex is moving downwards, his y velocity is negative.

It is important to note that without more specific information about the direction of Alex's motion, we cannot determine the exact algebraic signs of his velocities. However, this explanation covers the general cases and provides a clear understanding of how the algebraic signs of velocity depend on the direction of motion.

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Answer:

a) 756.64 ft

b) 30 degrees

c) 29.27 degrees.

Explanation:

We can represent the situation as follows:

So, we can find the magnitude of the displacement (the green line) using the Pythagorean theorem. Then:

Then, the angle of the displacement can be approximate finding the angle θ. So, using a protractor on the figure, we get that θ is approximately 30 degrees.

Now, we can find the direction using a trigonometric function as:

Because 370 is the opposite side and 660 is the adjacent side. Therefore, the value of θ is:

So, the answers are:

a) 756.64 ft

b) 30 degrees

c) 29.27 degrees.

The most likely outcome when a beam of light reflects from a shiny metallic surface at an arbitrary angle is that it becomes partially polarized. This means that option (d) "It is partially polarized" is the best answer.

When light waves strike a smooth metallic surface, such as polished metal, the reflection process can cause the incident light to become partially polarized. Polarization refers to the orientation of the electric field oscillations within the light wave. In the case of reflection from a metallic surface, the reflected light tends to be preferentially polarized in a specific direction perpendicular to the plane of incidence.

When unpolarized light strikes the metallic surface, some of the light waves get absorbed by the material or scattered in different directions, while the remaining light waves are reflected. The reflected light consists of both the original unpolarized light and the partially polarized light. The degree of polarization depends on factors such as the angle of incidence and the properties of the metallic surface. Therefore, when a beam of light reflects from a shiny metallic surface at an arbitrary angle, it is most likely to be partially polarized rather than totally absorbed (option a), totally polarized (option b), or unpolarized (option c).

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Answer:

Earth

Explanation:

Answer:

The electron gives up It's extra energy in a form called "photon light" and falls back down to its normal energy level

Explanation:

Answer:

To answer your question:

a) The formula to calculate the number of wavelengths within a laser pulse is:

number of wavelengths = pulse duration / wavelength

Plugging in the values given in the question, we get:

number of wavelengths = 38 ps / 1062 nm

Converting picoseconds to seconds and nanometers to meters, we get:

number of wavelengths = 38 x 10^-12 s / 1062 x 10^-9 m

number of wavelengths = 0.0358

Therefore, there are approximately 0.0358 wavelengths within the laser pulse.

b) To fit only one wavelength, the pulse duration would need to be equal to the wavelength. The formula to calculate the pulse duration is:

pulse duration = wavelength

Plugging in the value given in the question, we get:

pulse duration = 1062 nm

Converting nanometers to picoseconds using the speed of light ©, we get:

pulse duration = wavelength / c

pulse duration = 1062 x 10^-9 m / 3 x 10^8 m/s

pulse duration = 3.54 x 10^-12 s

Therefore, the pulse would need to be approximately 3.54 ps long to fit only one wavelength.

I hope this helps

. . .

. . .

. . .

!

.

Your answer is 0.30 seconds

The electric force between a +3 µC point charge and a –3 µC point charge if they are separated by a distance of 5.0 cm can be calculated by using Coulomb’s law. F = kq1q2 / r²F = (9.0 × 109 N·m2/C2) × (3.0 × 10-6 C) × (-3.0 × 10-6 C) / (0.05 m)²F = -243 N

The electric force between a +3 µC point charge and a –3 µC point charge if they are separated by a distance of 5.0 cm can be calculated by using Coulomb’s law.

Coulomb’s law states that the electric force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

Mathematically, F = kq1q2 / r²where, F is the electric forceq1 and q2 are the magnitudes of the two charges is Coulomb’s constant (9.0 × 109 N·m2/C2)r is the separation between the two charges.

Let's use the values from the question to calculate the electric force: F = kq1q2 / r²F = (9.0 × 109 N·m2/C2) × (3.0 × 10-6 C) × (-3.0 × 10-6 C) / (0.05 m)²F = -243 N (the negative sign indicates that the force is attractive)Therefore, the electric force between the two charges is 243 N.

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Answer:

The force on the wire increases

Explanation:

Since the force on the wire F = BILsinФ where B = magnetic field strength, I = current in wire, L= length of wire and Ф = angle between the magnetic field and the wire.

Given that the magnetic field and the wire are perpendicular, Ф = 90°

So, F = BILsin90° = BIL

Since B and L are constant, F ∝ I

So, if the current in the wire increases, the force on the wire also increases.