A large fish hangs from a spring balance supported from the roof of an elevator.
a) If the elevator has an upward acceleration of 2.45m/s2 and the balance reads 70.0N , what is the true weight of the fish?
b) Under what circumstances will the balance read 35.0N ?
c) What will the balance read if the elevator cable breaks?

Explanation:

Hope it helps~

Answer:

Electromagnetic or magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field.

Explanation:

correct me if im wrong:)

Answer:

The speed.

Explanation:

The slope of a line is that line's rate of change.  If a car is travelling at 20 km/hr and we plot distance vs time graph, the slope of that line will be 20.

F3 is the greatest of all forces , hence 3rd case in which masses were 200kg and 150 kg separated with a distance of 10 will have greatest force of all

The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them is called gravitation force of attraction

gravitation force = Gm1 m2 / \(r^{2}\)

G = gravitational constant

m1 = mass of one object

m2 = mass of other object

r = distance between them

case 1

F1 = G (50) (100) / \(20^{2}\) = 12.5 G

F2 = G (50) (10) / \(10^{2}\)  = 5 G

F3 = G (200) (150) / \(10^{2}\) = 300 G

F4 =  G (200) (150) / \(30^{2}\) = 33.33 G

F3 is the greatest of all forces , hence 3rd case in which masses were 200kg and 150 kg separated with a distance of 10 will have greatest force of all

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Answer:

C.

Explanation:

Answer:

A

Explanation:

Answer:

Distance divided by time

Explanation:

The sound wave took 1.2 seconds to travel from one whale to the other.

Velocity is a physical quantity that describes the rate of change of an object's position with respect to time and includes both the speed and direction of motion. It is a vector quantity, meaning it has both magnitude and direction and is typically measured in meters per second (m/s) or other appropriate units.

The time it took for the sound wave to travel from one whale to the other can be calculated using the formula:

time = distance/velocity

In this case, the distance between the whales is 1,800 meters and the velocity of sound in water is 1,500 meters per second. Therefore:

time = 1,800 meters / 1,500 meters per second

time = 1.2 seconds

Hence, The distance between the two whales was covered by the sound wave in 1.2 seconds.

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Answer:

Option 4

Explanation:

The difference between the Paleozoic and Mesozoic Era is that animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic Era.

The Paleozoic is the first part of the Phanerozoic Era, and is followed by the Mesozoic Era, which is the second part.

The difference between the Paleozoic and Mesozoic eras is "Animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic era." The correct option is D.

The Paleozoic era and Mesozoic era are two major divisions of geological time.

The Paleozoic era, also known as the "age of invertebrates," spanned from about 541 million years ago to about 252 million years ago. During this era, the first multicellular organisms evolved, and there was a rapid diversification of life forms. This era saw the rise of fish, amphibians, and reptiles, as well as the first forests and the development of early land plants. The Paleozoic era ended with a mass extinction event that wiped out about 90% of all marine species and nearly 70% of all land species.

The Mesozoic era, also known as the "age of dinosaurs," spanned from about 252 million years ago to about 66 million years ago. During this era, reptiles continued to dominate the land, and dinosaurs evolved and became the dominant terrestrial animals. This era also saw the rise of birds, the evolution of flowering plants, and the emergence of mammals. The Mesozoic era ended with a mass extinction event that wiped out the non-avian dinosaurs, as well as many other species of plants and animals.

Here in the Question,

Option A, "Animals lived in the water during the Mesozoic and on land in the Paleozoic," is not a correct difference between the two eras. In fact, animals lived both in the water and on land during both the Paleozoic and Mesozoic eras. The Mesozoic era is famous for the rise of the dinosaurs, which were primarily land-dwelling animals, while the Paleozoic era saw the rise of amphibians and the first land-dwelling vertebrates.

Option B, "The first birds emerged in the Paleozoic era while mammals first emerged in the Mesozoic," is also not a correct difference between the two eras. In fact, birds did not emerge until the Jurassic period of the Mesozoic era, while the first mammals are believed to have emerged during the late Triassic period.

Option C, "Many different species of dinosaurs lived in the Mesozoic, but they all died off in the Paleozoic," is not correct either. Dinosaurs first appeared during the Mesozoic era and dominated the terrestrial ecosystem for more than 150 million years before they went extinct at the end of the Cretaceous period. The Paleozoic era ended more than 100 million years before the first dinosaurs appeared.

Therefore, The correct option is D. Animal complexity increased during the Paleozoic while the first flowering plants appeared in the Mesozoic era.

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U generated less power between the 2 trials.

Comment if you need explaination

The independent variable is the type of rose, and the dependent variable is the quantity of flowers.

In mathematical modelling, statistical modelling, and experimental sciences, there are dependent and independent variables. Dependent variables get their name because, during an experiment, their values are investigated under the presumption or requirement that they are dependent on the values of other variables due to some law or rule.

Consider what is being recorded first in order to identify the variables; in this situation, it would be the variety and quantity of roses cultivated.

Asking yourself which one depends on which other will help you distinguish between which is reliant and which is independent.

Is it more likely that the number of flowers determines the type of rose?

Or does the type of rose affect how many blossoms are present?

Saying that a rose's kind depends on how many blossoms it has is illogical.

However, it does make sense to state that the type of rose affects how many blossoms are there.

As a result, the independent variable is the type of rose, and the dependent variable is the quantity of flowers.

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Answer:

The density will be 0.65 kg/m3

I think it won't float!! I am not sure though.

The magnification of the person's face is 3.19. The negative sign indicates that the image is inverted.

To find the magnification of the person's face, we can use the mirror equation: 1/f = 1/do + 1/di

where f is the focal length, do is the distance of the object from the mirror, and di is the distance of the image from the mirror. Since the mirror is concave, the focal length is negative and given by:

f = -R/2

where R is the radius of curvature.

Substituting the given values, we get:

1/(-16.1) = 1/12 + 1/di

Solving for di, we get:

di = -38.3 cm

The negative sign indicates that the image is virtual, which means that it cannot be projected onto a screen. The magnification of the person's face can be found using the formula: magnification = -di/do

Substituting the values, we get:

magnification = -(-38.3 cm)/12.0 cm = 3.19. Therefore, the magnification of the person's face is 3.19. The negative sign indicates that the image is inverted.

The image is located 38.3 cm to the left of the mirror, which means that it is virtual and located behind the mirror.

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If we maintain the percent error in gexp constant, the ratio Δgexp/gexp should rise as l falls and fall as l rises. It implies that the experimental prediction of g is more sensitive to variations in string length for shorter lengths than longer lengths.

To compare the calculated uncertainty in gexp for the shortest and longest values of l to the percent error in gexp, we need to refer to the lab manual for the derivation of uncertainty in g. Let's assume that the lab manual provides the following formula for the uncertainty in g:

Δg = \((2π/T^2)\) * ΔT

where T is the period of oscillation, ΔT is the uncertainty in T, and Δg is the uncertainty in the acceleration due to gravity (g).

Now, let's consider the effect of the length of the string on the experimental prediction. From the formula for the period of oscillation of a simple pendulum, we know that:

T = 2π√(l/g)

where l is the length of the string and g is the acceleration due to gravity.

If we differentiate this equation with respect to l, we get:

dT/dl = π/(gT√(l/g))

Using this equation and the formula for the uncertainty in g, we can derive the uncertainty in T due to the uncertainty in l:

ΔT = \((T^2/(4π^2*l))\) * Δl

Substituting this expression for ΔT into the formula for the uncertainty in g, we get:

Δg = \((2π^2/(T^3*l))\) * Δl

Now, let's consider the shortest and longest values of l. If we assume that the percent error in gexp is the same for both values of l, then we can write:

Δg/gexp = Δl/l

Therefore, we can compare the calculated uncertainty in gexp for the shortest and longest values of l to the percent error in gexp by comparing the ratios Δgexp/gexp and Δl/l for the two values of l.

If we assume that the uncertainty in l is the same for both values, then the ratio Δl/l is the same for both values. Therefore, any difference in the ratio Δgexp/gexp between the two values of l must be due to the effect of l on the experimental prediction.

From the formula for the uncertainty in gexp, we can see that Δgexp is inversely proportional to \(T^3\) and l.

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Answer:

Yes

Explanation:

The wind net force acting on the sail is doing work.   (The 'net' force takes into account the force of friction between the boat hull and the water)

The amplitude, frequency, tension, and density of the medium affects wavelength and wave speed.

Wave Speed: Wave speed refers to the rate at which the wave moves from one point to another in a given amount of time. It is calculated as the product of frequency and wavelength. Thus, any change in frequency or wavelength will affect the wave speed. The wave speed can also be determined by the properties of the medium through which the wave is moving. Tension, density, and elasticity of the medium affect the wave speed.

Tension: Tension is the force per unit length of a medium. In a taut string, the tension can be changed by adjusting the tightness of the string. If the tension is increased, the wave speed will increase. Therefore, an increase in tension results in an increase in wave speed.

Density: Density refers to the amount of mass present in a unit volume of a medium. If the density of the medium is increased, the wave speed decreases. This is because an increase in density means that the particles in the medium are closer together, so it will take a longer time for the wave to travel through the medium.

Elasticity: Elasticity refers to the ability of a medium to be deformed under tension and then return to its original shape after the tension is released. If the medium is more elastic, then the wave speed will be higher.Wavelength:The wavelength is the distance between two successive points on a wave that are in phase. It is represented by the symbol λ (lambda). The wavelength can be affected by the properties of the medium through which the wave is moving.

Frequency: Frequency is the number of oscillations or vibrations per second that the wave produces. If the frequency of the wave is increased, the wavelength will decrease. This is because the wave has to travel faster to produce more oscillations in a given time.

Amplitude: Amplitude refers to the maximum displacement of particles from their equilibrium position during the vibration of the wave. If the amplitude of the wave is increased, the wavelength will also increase. This is because the wave has to travel a greater distance to produce the same displacement of particles.

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Answer:

kinematics explains the terms like acceleration, velocity, and position of the objects while in motion.

Some important parameters in kinematics are displacement, velocity, and time.

Explanation:

your welcome,can you give me the brainliest? plssss

thank me if it was correct for you too.

Answer:

Explanation:

Quantum tunneling can be described as a quantum mechanical process where wavefunctions can penetrate through a potential barrier.

The transmission via the potential barrier can be finite and also depend upon the barrier width as well as barrier height. The wave functions have the probability of disappearing on one side and reappear on the remaining side.

The 1st derivative of the wave functions is generally continuous. In the steady state, the probability flux is spatially uniform and no wave or particle is eliminated. Tunneling can occur with barriers of thickness about 1 to 3 nm and smaller.

Quantum tunneling plays a crucial role in phenomena such as nuclear fusion and α-radioactive decay of atomic nuclei. Quantum tunneling has applications in the tunnel diode, in scanning tunneling microscope, and in quantum computing.

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Quantum tunneling is a phenomenon in quantum mechanics where wavefunctions can pass through a potential barrier. It is a process that defies classical physics, where particles would be expected to bounce back when they encounter a barrier.

In quantum mechanics, particles are described by wavefunctions, which are mathematical representations of their quantum states. These wavefunctions can extend into regions that are classically forbidden, such as inside a potential barrier.

The probability of a particle "tunneling" through the barrier depends on various factors, including the width and height of the barrier. The wavefunctions have a certain probability of disappearing on one side of the barrier and reappearing on the other side.

One important characteristic of quantum tunneling is that the first derivative of the wavefunctions is generally continuous. This means that there is a smooth transition between the regions before and after the barrier. In the steady state, the probability flux is spatially uniform, meaning that no waves or particles are lost during the tunneling process.

Quantum tunneling has significant implications in various areas of physics. It plays a crucial role in phenomena such as nuclear fusion and alpha-radioactive decay of atomic nuclei. It also has practical applications, such as in tunnel diodes, scanning tunneling microscopes, and quantum computing.

Quantum tunneling is a fascinating phenomenon in quantum mechanics where particles can pass through potential barriers that classical physics would consider impossible to overcome.

In classical physics, particles are confined to their energy levels and cannot pass through energy barriers unless they have enough energy to overcome them. However, in quantum mechanics, particles can exhibit wave-like behavior and their wavefunctions can extend beyond the physical boundaries we would expect them to be confined to.

When a particle encounters a potential barrier, there is a probability that its wavefunction can penetrate through the barrier and appear on the other side. This means that even if the particle does not have enough energy to overcome the barrier classically, there is still a chance that it can "tunnel" through the barrier and continue its motion on the other side.

The probability of tunneling depends on factors such as the width and height of the potential barrier. In some cases, the wavefunction can completely disappear on one side of the barrier and reappear on the other side.

Quantum tunneling is not limited to any specific system but can occur in a wide range of phenomena. It has been observed in nuclear fusion, where particles overcome the Coulomb repulsion barrier and fuse together. It also plays a role in the alpha decay of atomic nuclei. Additionally, quantum tunneling has practical applications in devices like tunnel diodes, which exploit this phenomenon to create unique electrical behavior.

Overall, quantum tunneling is a fundamental concept in quantum mechanics that allows particles to defy classical limitations and pass through barriers that would be impossible to overcome classically.

Answer: sonar and radar

Explanation:

Picture

the distance of the second anti-node from the end x = 0 is given by:(2 × 2 - 1)λ/4 = 3/8 meters

Answer: 3/8 meters

The given wave function is:

y(x,t) = A sin(πx)cos(2πt)We need to determine the position of the second anti-node from the end x = 0.

The formula for the anti-nodes of a standing wave is given by:

L = (2n - 1)λ/4

Here,L = Length of the string

n = Node number

λ = Wavelength

For the given wave function:

y(x,t) = A sin(πx)cos(2πt)We can see that the wave function is of the standing wave in the string fixed at both ends. Therefore, both ends of the string are nodes. Now, we need to find the position of the second anti-node from the end x = 0.We know that for the standing wave in the string fixed at both ends, the nth anti-node will be at the distance of (2n - 1)λ/4 from one of the ends.

Therefore, the second anti-node from the end x = 0 will be at the distance of (2 × 2 - 1)λ/4 from x

= 0.Now,λ = 2L/n

λ = 2(1/2)/2λ = 1/2

Therefore, the distance of the second anti-node from the end x = 0 is given by:(2 × 2 - 1)λ/4 = 3/8 meters

Answer: 3/8 meters

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The answer is yes, I would suggest using the same metric system because in whole world the metric system is same then it will be easy to solve the problems.

The progressions metric system, which had been implemented in France in the 1790s, was the measuring system that was replaced by the metric system. The International System of Units (SI), which was created in the middle of the 20th century with the help of an international standards body, was the historical culmination of the evolution of these systems. The term "metrication" refers to the adoption of the metric system.

The acknowledgement of various principles is the result of the historical development of metric systems. One base unit of measurement can be used to express each of nature's essential dimensions.

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Answer: 3.08 !! <3

Explanation: im sorry but im not sure y i just got the answer wrong and this is wut it told me was right :)

Answer:

The answer is A. 3.08 kg

Answer:

Since the iodine is added as 1-anion, the number of electrons is 54( 53-(1-) =54

The environment was quite different. Based on the sediment in the rock sample (photograph X), it is likely that this area was once covered by a shallow sea or ocean. The presence of fine-grained sediment, such as silt and clay, suggests that the water was relatively calm and quiet.

About 290 million years ago, during the Paleozoic era, Kansas was covered by a shallow sea known as the Permian Sea. The sedimentary rocks found in Kansas, including limestone, sandstone, and shale, were deposited in this sea over millions of years.

The environment in which sediment is deposited can provide clues about the conditions of the area at the time. Based on the type of rock you mentioned, it is likely that the sediment was deposited in a marine environment, such as a shallow sea or a shoreline. The limestone could have been formed from the accumulation of shells and other organic material from marine organisms, while the sandstone and shale could have been deposited by erosion and transport of sediment from nearby land.

In terms of the landscape, it is possible that the area that is now Kansas was a low-lying coastal plain, with rivers and streams carrying sediment into the sea. The rolling hills and farm fields seen today are a result of more recent geologic processes, such as erosion and deposition by wind and water.

Overall, the sediment in the rock sample you mentioned was likely deposited in a marine environment in what is now Kansas, during the time period of the Permian Sea.

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Answer:it's a chemical change.physical changes occur without 2 or more reactants,a reaction,and a product

Explanation:

Answer:

10km/h describe its velocity

Explanation:

Velocity =distance /time

It defined as the rate of change of the object's position with respect to a frame of reference and time.

If you travel a distance of 10 Km in 1 hour then 10 km/h is your velocity.

Velocity can be explained as a vector measurement of the direction and rate of motion of an object. The velocity of an object can be specified as the rate of change in the object’s position w.r.t. time.

Velocity can be defined as a vector parameter as it consists of both magnitude and direction. The velocity can be determined from the formula mentioned below:

v = d / t

where v is the velocity, d represents the distance covered, and t is the time.

Although the S.I. unit for the measurement of velocity is m/s or, miles per hour (mph), and kilometers per hour (kph).

Given, the distance traveled, d = 10  km

The time is taken, t = 1 hr

The velocity, v = d/t = 10 km/1 h = 10 km/h

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The coefficient of kinetic friction is approximately 0.102.

The  coefficient of kinetic friction is calculated by using the following formula;

frictional force = coefficient of kinetic friction x normal force

Since the object is not accelerating, we know that the force of gravity pulling down on the object is equal and opposite to the normal force pushing up on the object. Therefore, we can use the formula:

normal force = weight of the object = mass x gravity

where;

So, the normal force on the object is:

normal force = 95 kg x 9.8 m/s^2 = 931 N

Now we can substitute the values we have into the formula for coefficient of kinetic friction:

95 N = coefficient of kinetic friction x 931 N

Solving for the coefficient of kinetic friction, we get:

coefficient of kinetic friction = 95 N / 931 N ≈ 0.102

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The complete question is below:

The mass of the object is 95kg. What is the coefficient of kinetic frictions, if the frictional force is 95N.

i. The gravitational force between the earth and sun can be obtained as follow:

F = GM₁M₂ / r²

F = (6.67×10¯¹¹ × 5.987×10²⁴ × 1.989×10³⁰) / (1.5×10¹¹)²

F = 3.53×10²² N

Thus, the gravitational force between the earth and sun is 3.53×10²² N

ii. The gravitational force between the earth and moon can be obtained as follow:

F = GM₁M₂ / r²

F = (6.67×10¯¹¹ × 5.987×10²⁴ × 7.347×10²²) / (3.844×10⁸)²

F = 1.99×10²⁰ N

Thus, the gravitational force between the earth and moon is 1.99×10²⁰ N

Comparison = G₁ / G₂

G₁ / G₂ = 3.53×10²² / 1.99×10²⁰

G₁ / G₂ = 177

Cross multiply

G₁ = G₂ × 177

Thus, we can say that the gravitational force between the earth and sun is 177 times bigger than the gravitational force between the earth and moon

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Answer:

-8.4°C

Explanation:

From the principle of heat capacity.

The heat sustain by an object is given as;

H = m× c× (T2-T1)

Where H is heat transferred

m is mass of substance

T2-T1 is the temperature change from starting to final temperature T2.

c- is the specific heat capacity of ice .

Note : specific heat capacity is an intrinsic capacity of a substance which is the energy substained on a unit mass of a substance on a unit temperature change.

Hence ; 35= 1× c× ( T2-(-25))

35= c× ( T2+25)

35 =2.108×( T2+25)

( T2+25)= 35/2.108= 16.60°{ approximated to 2 decimal place}

T2= 16.60-25= -8.40°C

C, specific heat capacity of ice is =2.108 kJ/kgK{you can google that}

To solve this we must be knowing each and every concept related to energy. Therefore, -8.40°C is the final temperature of the ice.

In physics, energy is the capacity to accomplish work. It can be potential, kinetic, temperature, electrical, chemical, radioactive, or in other forms.

There is also heat and work—energy inside the process of being transferred through one body to the other. Energy is always classified according to its type once it has been transmitted. As a result, heat transported could become thermal energy, whereas labor done may emerge as mechanical energy.

H = m× c× (T2-T1)

35= 1× c× ( T2-(-25))

35= c× ( T2+25)

specific heat capacity of ice is =2.108 kJ/kgK

35 =2.108×( T2+25)

( T2+25)= 35/2.108= 16.60°

T2= 16.60-25= -8.40°C

Therefore, -8.40°C is the final temperature of the ice.

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Answer:

Option C or the third option.

Explanation: Water is a renewable resource there is so much of it and it just keeps circulating through the system it doesn't run out.

Answer:

c

Explanation: