What is the net force on a rock that has a force of 4.9N down and 2.8N up applied to it
7.7N up

-7.7N down

-2.1N down

2.1N down

The plane mirrors and convex mirrors form only virtual images because reflected rays appear to come from behind the mirror.

In plane mirrors, the surface is totally  flat, making light rays to reflect off the surface at the same angle at which they hit it. The reflected rays appear to come from behind the mirror, making a virtual image.

The image created by a plane mirror is of the same size as the object and appears to be situated behind the mirror.

Likewise, convex mirrors have a curved outward surface. When light rays hit a convex mirror, they diverge after reflection. This divergence makes the reflected rays to appear to come from behind the mirror as well, that results in the formation of a virtual image.

Convex mirrors have a vast field of view due to the divergence of the reflected rays, that allows them them to show a wider angle of view compared to flat or concave mirrors.

Hence, the right answer is option b: because reflected rays appear to come from behind the mirror.

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The magnitude of the average induced EMF in the loop (in mv) during this time is 33 mv

Given that a circular loop of aluminum wire in a uniform magnetic field pointing into the page. The loop has a radius (r) of 11 cm which is 0.11 m, the magnitude of the field (B) is 0.16 T, and the time taken to close the loop (t) is 0.18 s.

We need to find the magnitude of the average induced EMF the loop during this time.

The Induced emf in the ring when the area of the ring is reduced to zero is 0.97 mV.

The induced emf in the coil is given by,

E = -ΔФ/ΔT

Where,

Ф is the magnetic flux,

T is the time,

ΔФ = BΔA

B is the magnetic field,

ΔA is the change in area.

The area reduced from 11 x 10⁻⁴cm² x  to 0cm² and The magnetic field is 0.160T and the time taken is 0.180 seconds.

Now, putting all the values,

E = -0.160 x 11 x 10⁻⁴/0.180

E = 0.97 mV.

Hence, the emf induced in the coil in millivolts is 0.97mV.

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The long lifespan of CFC (chlorofluorocarbon) molecules significantly affects the rate of repair of the ozone layer.

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\(\\ \rm\rightarrowtail W=Fx\)

\(\\ \rm\rightarrowtail 12=1.6F\)

\(\\ \rm\rightarrowtail F=7.5N\)

Now

\(\\ \rm\rightarrowtail F=-Kx\)

\(\\ \rm\rightarrowtail 7.5=-1.6k\)

\(\\ \rm\rightarrowtail k=-4.68N/m\)

While a better Operating Ratio generally indicates higher efficiency and profitability, there are circumstances where focusing on other strategic initiatives, such as infrastructure investments or pricing strategies, can result in increased revenue and ultimately lead to higher profits, even with a temporarily worse Operating Ratio.

While it may seem counterintuitive, it is indeed possible to make more money with a worse Operating Ratio in certain situations. The Operating Ratio is a financial metric used in the railroad industry to measure the efficiency of operations, calculated by dividing operating expenses by operating revenue and expressing it as a percentage. A lower Operating Ratio indicates better cost control and higher profitability.

However, there are scenarios where focusing solely on achieving a better Operating Ratio may not necessarily maximize profits. For instance, a railroad company might strategically invest in infrastructure upgrades or equipment purchases that temporarily increase operating expenses but lead to long-term revenue growth. These investments can be essential for expanding capacity, improving service quality, and attracting more customers, ultimately generating higher overall revenue despite a temporary increase in operating expenses.

Additionally, a railroad may adopt pricing strategies to maximize revenue, even if it negatively impacts the Operating Ratio. This could involve offering discounted rates or incentives to secure long-term contracts with high-volume customers, resulting in lower operating revenue per unit but ensuring a steady and predictable stream of business.

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A geostrophic flow is a type of motion in the atmosphere or ocean that is influenced by the Coriolis force and the pressure gradient force. The Coriolis force arises due to the rotation of the Earth and causes the fluids to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

The pressure gradient force, on the other hand, is responsible for the movement of air or water from high pressure to low pressure regions. In a geostrophic flow, these two forces are balanced, resulting in a steady and straight flow along the contour lines of constant pressure.

The geostrophic flow is an important concept in meteorology and oceanography as it helps to explain the large-scale circulation patterns of the Earth's atmosphere and oceans. This type of flow can be observed in high-altitude winds, ocean currents, and weather systems such as hurricanes and cyclones. Understanding the dynamics of geostrophic flow is crucial for predicting weather patterns and studying the Earth's climate system.

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Answer:

The mass of the block of material is 3 x 10³⁷ g/mol

The charge of the material is  4.8 x 10⁸ C

Explanation:

Given;

number of protons of the material, P = 3 x 10²⁷

number of neutrons in the material, N = 3 x 10³⁷

number of electrons in the material, E =  3 x 10²⁷

The mass of the block of material is calculated as follows;

M = P + N

M =  3 x 10²⁷ +  3 x 10³⁷

M =  3 x 10³⁷ g/mol

The charge of the material is calculated as follows;

charge of 1 electron = 1.6 x 10⁻¹⁹ C

charge of  3 x 10²⁷ electrons =  3 x 10²⁷ electrons   x   1.6 x 10⁻¹⁹ C

                                                = 4.8 x 10⁸ C

Each solution tested has its advantages and disadvantages. The most effective solution depends on the situation and the amount of oil that needs to be removed from the water.

The three solutions tested to remove oil from water are scooping the oil with a spoon, absorbing the oil with a paper towel, and using soap to break up the oil. Each solution has its advantages and disadvantages. Scooping the oil with a spoon is an effective solution to remove a significant amount of oil quickly. However, it is not a practical solution for removing a large amount of oil. The disadvantage is that it spreads the oil around the surface of the water and leaves some oil in the water. Absorbing the oil with a paper towel can effectively remove a lot of oil. The advantage is that it removes some oil from the water, leaving it relatively clean. However, it also picks up a lot of water and can't get all of the oil. Using soap to break up the oil is a good solution that removes all of the oil from the water. The advantage is that it removes all of the oil from the water, leaving it clean. However, the disadvantage is that it disperses the oil on the surface of the water, making it harder to remove from the sides of the bowl. In conclusion, each solution tested has its advantages and disadvantages. The most effective solution depends on the situation and the amount of oil that needs to be removed from the water.

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Answer:

Explanation:

What is a free body diagram?

Answer: a force diagram is a graphical illustration used to visualize the applied forces and resulting reactions on a body in a given condition

Drawing a free-body diagram for this problem

Answer: Look at the attached picture, ask me any questions if you are still confused. It is a little messy since I didn't have my pen.

Find its weight on Earth

Answer: The weight is dependent on the mass of the object and the gravitational constant on the planet. The gravitational constant, in this case, is 9.8.

   so the weight = mass * gravitational constant = m * g = 1000 * 9.8

                          = 9800 N

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The tension in string 1 is lesser than to the tension in string 2.

What is meant by tension in a string?

It is possible to refer to tension as the action-reaction pair of forces acting at each end of the aforementioned elements. Tension is defined as the pulling force transmitted axially by a string, rope, chain, or other similar object, or by each end of a rod, truss member, or other comparable three-dimensional object.

The tension in the string has a square root relationship with wave speed, while the linear density of the wire has a square root relationship with wave speed. v=sqrt(T/u)

A larger thickness suggests a higher linear density (mass per length. Thus, the speed would be slower. The wave in string 1 moves slower than the wave in string 2, and vice versa.

According to a thick string, there is a lot of mass per length and the wave speed is slow.

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The approach which currently is proving to be the most promising in determining how life on earth originated is the laboratory simulations of conditions present on the early earth.

The conditions that were present on the early earth were:

The laboratory simulations of conditions on early earth was a chemical experiment named as Miller-Urey experiment, which in 1952 simulated the conditions that were present on the early earth.

In 1952, Stanley Miller and Harold Urey simulated the conditions of early Earth by sealing water, methane, ammonia and hydrogen in a glass flask. Then they applied electrical sparks to the mixture.

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Answer:

Period = 0.68 seconds

Explanation:

Given the following data;

Number of oscillation = 22

Time = 14.9 seconds

To find the period;

Method I.

Period = time/number of oscillation

Period = 14.9/22

Period = 0.68 seconds.

Method II.

We would find the frequency of the wave;

Frequency = time/number of oscillation

Frequency = 22/14.9

Frequency = 1.48 Hertz

Next, we find the period;

Period = 1/frequency

Period = 1/1.48

Period = 0.68 seconds

Acceleration is the rate of change of speed as a feature of the time.

Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.

Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.

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Answer:

a

Explanation:

The uterus lining is rebuilt by the end of the menstrual period. The rebuilding of the uterus lining starts after menstruation and the lining is typically completely rebuilt by day 14 of the menstrual cycle, which is when ovulation occurs and the uterus is preparing to potentially receive a fertilized egg.

The endometrium is the inner lining of the uterus, and it thickens every month to prepare for pregnancy. After menstruation, the endometrium grows and thickens to prepare for the implantation of a fertilized egg. The cells in the lining multiply and enlarge, and the glands in the lining begin to secrete mucus and other substances that help support the fertilized egg and promote its growth.

The rebuilding of the endometrium usually takes about two weeks after menstruation. This process is closely regulated by hormones such as estrogen and progesterone, which are produced by the ovaries and other parts of the body. These hormones help control the growth and development of the endometrium and other reproductive tissues.

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As you're applying force to the car, the mud which is a sinking surface would but you in the same place as the car is. The car is stuck in the mud and sunk to point where it cannot be pulled out unless an outside force interferes. When you apply force into the car and try to push it out, you would be put in the same situation. You would be experiencing friction which is an opposing force, in this problem, a simple machine such as a pulley would be helpful as it can lift the car from the outside. The car would act as a load and someone or some type of machine can use force to pick the car out of the mud. But if you were to try to push it out of the mud, you would just sink as the force applied would only put you in the same situation as the car, overall resulting in both beings (objects - car, human - "you" POV) being stuck in the same conumdrum.

Answer:

See below

Explanation:

Gravity will pull you down as you stand in the mud.

Additionally , if you do not push exactly horizontally ......like you push UP some , the equal and opposite force will push YOU down into the mud.

  This would be like picking up a weight while you are standing there

      F = ma  will be greater and you will get muddier !

The wavelength of the sound wave, given that wave has a frequency of 35 Hz and travelling at 1500 m/s is 42.86 m

First, we shall list out the given parameters from the question. This is given below:

The wavelength of the sound wave can be obtained as illustrated below:

Velocity (v) = wavelength (λ) × frequency (f)

1500 = wavelength × 35

Divide both sides by 35

Wavelength = 1500 / 35

Wavelength = 42.86 m

Thus, from the above calculation, we can conclude that the wavelength of the sound wave is 42.86 m

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Answer:

20

Explanation

f=Kgm/s
2multiply by 10=20

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The characteristic of waves that remains unchanged when it enters a distinct medium is the frequency (Option B).

The expression 'wave frequency' indicates the period of time or occurrence of a particular type of wave.

In conclusion, the characteristic of waves that remains unchanged when it enters a distinct medium is the frequency (Option B).

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Answer: B. frequency

Explanation: plato answer :)

Answer:

1.01×10^20 molecules of ozone.

Explanation:

Data obtained from the question include:

Volume (V) = 2 L

Temperature (T) = 275 K

Pressure (P) = 1.89×10¯³ atm

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) of ozone =.?

Using the ideal gas equation, we can obtain the number of mole of ozone as follow:

PV = nRT

1.89×10¯³ x 2 = n x 0.0821 x 275

Divide both side by 0.0821 x 275

n = (1.89×10¯³ x 2) /(0.0821 x 275)

n = 1.67×10¯⁴ mole.

Therefore the number of mole of ozone in 2 L of air is 1.67×10¯⁴ mole.

Finally, we shall determine the number of molecules present in 1.67×10¯⁴ mole of ozone.

This can be obtained as follow:

From Avogadro's hypothesis, 1 mole of any substance contains 6.02×10²³ molecules. This implies that 1 mole of ozone contains 6.02×10²³ molecules.

If 1 mole of ozone contains 6.02×10²³ molecules,

therefore, 1.67×10¯⁴ mole of ozone will contain = 1.67×10¯⁴ x 6.02×10²³ = 1.01×10^20 molecules.

Therefore, 1.01×10^20 molecules of ozone are present in 2 L of air.

Answer:

he will not be drowned

Explanation:

Question says , the height of the student = 4 feet,

Depth of the pool( in feet ) be x ( say ) which is less than  4 feet,

Clearly, the depth of the pool < height of the student,

This means, if the student goes for swimming in the pool, however he does not know swimming, he will not be drowned until he is suffering from an injury or external force.

Andrew's displacement while visiting his grandparents is 35 miles to the east.

The displacement is the shortest distance travelled by the particle. It is the vector quantity which represents both the magnitude and direction.

Given Andrew drives to his friend's house, which is 60 miles to the east. After visiting, he travels 25 miles to the west to visit his grandparents.

The displacement will be

60 miles to the east - 25 miles to the west = 35 miles to the east

Thus, the Andrew's displacement is 35 miles to the east.

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A plane mirror always forms a virtual image because of the following reasons:

1. When light rays from an object fall on a plane mirror, they get reflected from the mirror. After reflection, they never meet at any point in real but they appear to meet at some point.

2. The image formed by a plane mirror cannot be obtained on a screen.

3. Plane mirrors never focus light into a single converging point.

Hi there!

We can begin by calculating the distance remaining after the reaction time.

Δd = vt

Calculate the distance traveled within this time:

Δd = (16)(.79) = 12.64 m

Subtract from the total distance:

150 - 12.64 = 137.66 m remaining

We can use the following equation to solve for the acceleration necessary:

vf² = vi² + 2ad, where vf = 0 since the train will have slowed down to rest.

Rearrange in terms of "a":

0 = vi² + 2ad

(-vi²) = 2ad

(-vi²)/2d = a

Plug in the given values:

(-(16²))/2(137.66) = a

-256/275.32 = -.9298 m/s²

The modifications that are implemented after Tacoma bridge disaster are added trusses and openings below road decks to decrease oscillations.

While marching, the natural frequency of the vibrations of marching soldiers matched up with the resonant frequency of the bridge. This resulted in the collapsing of the bridge in seconds.

Because of the disaster of the Tacoma Narrows Bridge, the bridge was strengthened by adding trusses as well as openings below road decks so as to decrease vibrations caused by running vehicles on the bridge.

Thus, the modifications that are implemented after Tacoma bridge disaster are added trusses and openings below road decks to decrease oscillations

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The central maximum is along the central axis of the slit and does not subtend any angle as measured from the slit.

sin θ = (mλ) / w

Plugging in the values, we get:

sin θ = (0 × 5.00 × \(10^{-7\) m) / 3.00 × \(10^{-5\) m

sin θ = 0

A slit is a narrow opening or gap in a surface or material. Slits can be found in a variety of contexts, from the narrow opening in a mail slot to the aperture in a camera lens. In optics, a slit is commonly used as a component of a device known as a slit-lamp, which is used to examine the eyes of patients. A narrow beam of light is shone through the slit, which can be adjusted to control the size of the beam, and the resulting image is viewed through a microscope.

In physics, slits are also important in the study of wave phenomena such as diffraction and interference. A double-slit experiment, for example, involves shining a light through two parallel slits and observing the resulting pattern of light and dark fringes on a screen. This experiment provides evidence of the wave-like nature of light and other particles.

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Answer:

it gives off 71.0 kJ of heat.

Explanation:

Answer:

The length is \(s = 3.73 \ m\)

Explanation:

From the question we are told that

  The speed is  \(v = 3.054 \ m/s\)

  The acceleration \(a = -0.7762 m/s^2\)

   The time taken is  \(t = 1.51 \ s\)

Generally from kinematics equation the length of the inclined plane is mathematically represented as

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

=>      \(s = 3.054 *1.51 + \frac{1}{2} * (-0.7762) *(1.51)^2\)

=>   \(s = 3.73 \ m\)

To determine the longitudinal Young's modulus (E1) and longitudinal tensile strength (σ1t) of a unidirectional carbon/glass composite, we need the specific properties of the carbon and glass constituents, as well as the fiber volume fraction.

The longitudinal Young's modulus (E1) of the composite can be calculated using the rule of mixtures: E1 = Vcarbon * Ecarbon + Vglass * Eglass. where Vcarbon and Vglass are the volume fractions of carbon and glass fibers, respectively, and Ecarbon and Eglass are the Young's moduli of carbon and glass fibers, respectively. The longitudinal tensile strength (σ1t) can be determined using the following equation: σ1t = Vcarbon * σcarbon + Vglass * σglass. where σcarbon and σglass are the tensile strengths of carbon and glass fibers, respectively. The fiber volume fractions (Vcarbon and Vglass) depend on the specific composite fabrication process and design considerations. Once you provide the constituent properties (Ecarbon, Eglass, σcarbon, and σglass) and the fiber volume fractions, I can assist you in calculating E1 and σ1t.

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