A 10 - kg object is dropped from rest. after falling a distance of 50 m, it has a speed of 26 m/s. how much work is done by the dissipative (air) resistive force on the object during this descent?

Answers

Answer 1

Using the equation of motion,

v^2 = u^2 + 2as, where v = final velocity, u = initial velocity = 0 m/s, a = acceleration = gravitational acceleration = 9.81 m/s^2, s= distance = 50 m

Therefore,

v = Sqrt (2*9.81*50) = 31.32 m/s

But, it is noted that the actual velocity is 26 m/s.

The difference between Kinetic Energies is the work done to overcome the air resistance.

That is,

Work done = 1/2*10*31.31^2 - 1/2*10*26^2 = 1/2*10 (31.32^2-26^2) = 1,525 J

Related Questions

A ray of light traveling in air strikes the surface of a liquid. if the angle of incidence is 29.7◦ and the angle of refraction is 16.3◦ , find the critical angle for light traveling from the liquid back into the air. answer in units of ◦

Answers

When light moves from a medium with higher refractive index to a medium with lower refractive index, the critical angle is the angle above which there is no refracted ray, and it is given by:
[tex]\theta_c = \arcsin ( \frac{n_r}{n_i} )[/tex] (2)
where [tex]n_r[/tex] is the refractive index of the second medium and [tex]n_i[/tex] is the refractive index of the first medium.

We can find the ratio [tex]n_r / n_i[/tex] by using Snell's law:
[tex]n_i \sin \theta_i = n_r \sin \theta_r[/tex] (1)
where
[tex]\theta_i[/tex] is the angle of incidence
[tex]\theta_r[/tex] is the angle of refraction

By using the data of the problem and re-arranging (1), we find
[tex] \frac{n_r}{n_i} = \frac{\sin \theta_i}{\sin \theta_r} = \frac{\sin 16.3^{\circ}}{\sin 29.7^{\circ}} =0.566 [/tex]

and if we use eq.(2) we can now find the value of the critical angle:
[tex]\theta_c = \arcsin ( \frac{n_r}{n_i} ) = \arcsin (0.566) = 34.5^{\circ}[/tex]

What is the frequency corresponding to a period of 8.01 s?

Answers

The frequency of an oscillation is equal to the reciprocal of the period:
[tex]f= \frac{1}{T} [/tex]
where
f is the frequency
T is the period

In our problem, the period is T=8.01 s, therefore the corresponding frequency is
[tex]f= \frac{1}{8.01 s}=0.12 s^{-1} = 0.12 Hz [/tex]

Final answer:

The frequency corresponding to a period of 8.01 seconds is calculated using the formula f = 1/T, resulting in a frequency of approximately 0.125 Hz.

Explanation:

The question relates to the concept of period and frequency in wave motion which is a topic in Physics. To find the frequency corresponding to a period of 8.01 s, you use the formula f = 1/T, where f is the frequency and T is the period. Applying this formula:

f = 1/T = 1/8.01 s ≈ 0.125 Hz

Therefore, the frequency corresponding to a period of 8.01 seconds is approximately 0.125 Hertz (Hz).

Explain why a cow that touches an electric fence experiences a mild shock

Answers

The voltage exists between the fence and the ground. The cow is grounded. The cow is touching the ground, completing the circuit of electricity. When the cow comes into contact with the fence, it becomes an electric ground which sends an electric current into the cow, through the cow, and into the ground. The pain experienced from the shock is due to the current that flows through the cow.

Final answer:

A cow experiences a mild shock from an electric fence because its body conducts electricity, completing a circuit to the ground, which is designed to be unpleasant but not harmful. Modern electric fences use pulsed currents to allow detachment, with safety standards keeping shocks below the harmful threshold.

Explanation:

When a cow touches an electric fence, it experiences a mild shock due to the principles of electricity and current flow in living organisms. Our bodies, similar to the cow's, are good conductors because of the high water content. This conductivity allows electric currents to flow through us, following the path of least resistance to reach the ground, often referred to as 'earthing'. Electric fences are designed to give a shock that is unpleasant but not harmful, utilizing a small current that can cause a sensation but is usually not enough to damage tissue.

Modern electric fences are now pulsed on and off to allow someone who touches them to pull away. This design is vital for safety, preventing prolonged exposure that could lead to muscular contractions strong enough to prevent letting go of the fence. Shocks from electric fences are typically below 5 mA (milliamps), which is the maximum allowed shock according to many safety standards. This threshold ensures the shock is felt but remains within a range considered to be harmless.

Additionally, the earth acts as a natural electron sink, allowing currents to dissipate safely when an individual or animal completes the circuit by touching the fence while grounded. However, insulating materials such as rubber shoes can break this path, preventing the shock, which is why electrical safety protocols often include insulating gear to prevent the flow of electrical currents through the body.

Which of the following describes groundwater?

Groundwater is a renewable resource.

Groundwater flows quickly.

Groundwater exists only in regions that get a lot of rain.

Groundwater does not exist during dry periods.

Answers

I believe it is the 2nd one because the ground purifies it over a period of a little while.

Answer: Groundwater exists only in regions that get a lot of rain.

Groundwater is the reservoir of water this water accumulates in the ground surface or subsurface of the earth crust through tiny pores and fractures in the rocks. The source of water are streams of rivers, oceans, lakes and large depositing is because of water from the rain and melting of the snow. It is a source of freshwater in nature.

According to the above description, Groundwater exists only in regions that get a lot of rain can be considered as correct option.

If the sun were replaced by a 1-solar-mass black hole, what would be the gravitational pull of the black-hole "sun" on earth?

Answers

If the Sun were replaced by a 1-solar-mass black hole, then Earth wouldcontinue to orbit the black hole in precisely its present orbit. The planets would actually continue on in their orbits as if nothing had happened.

Final answer:

The gravitational pull that a 1-solar-mass black hole would exert on Earth is the same as the sun. This is because gravitational pull is determined by mass and distance. However, life on Earth would be greatly impacted due to the lack of sunlight and heat.

Explanation:

If the sun was replaced by a 1-solar-mass black hole, the gravitational pull it exerts on Earth would be the same as that of the sun. This is due to the fact that gravitational pull is determined by mass and distance. Considering the mass would be the same and the distance between Earth and the black hole would remain constant, the gravitational pull remains unaffected.

However, without the sun's light and heat, life as we know it on Earth would not be sustainable. It's also important to note that while the gravitational pull remains the same, various other aspects of having a black hole instead of a sun would drastically impact our planet.

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A car approaches a police radar gun. how does the wavelength of the signal detected within the car compare with that emitted by the radar gun? the wavelength detected inside the car is longer. the wavelength detected inside the car might be shorter or longer depending on speed range. the wavelength detected inside the car is the same. the wavelength detected inside the car is shorter.

Answers

A car approaches a police radar gun. The wavelength detected inside the car is shorter compared with that emitted by the radar gun. If travelling at a changeable speed towards the gun, the wavelength detected inside the car might be shorter or longer depending on actual speed at any moment.

A student wants you to demonstrate that an electric current will produce a magnetic field. Which set of objects could be used to demonstrate this? A) A battery, a coil of wire and a compass. B) A compass, some paper clips and a battery. C) A battery, an iron nail and a long copper wire. D) An iron nail, a permanent magnet and a battery.

Answers

Answer:

Explanation:

A compass can show that an electric field is present. So, a battery, a coil of wire and a compass together could demonstrate that an electric current produces a magnetic field.

Answer:

a battery, a coil of wire and a compass

Explanation:

A compass can show that an electric field is present. So, a battery, a coil of wire and a compass together could demonstrate that an electric current produces a magnetic field.

What is an outward curving lens

Answers

A concave lens is exactly the opposite with the outer surfaces curving inward, so it makes parallel light rays curve outward or diverge.

An outward curving lens, or convex lens, converges light rays and is an essential element in optical devices like microscopes and cameras. It has a positive radius of curvature by convention. Convex lenses help correct farsightedness by focusing light rays onto a specific point.

An outward curving lens, also known as a convex lens or a converging lens, is a lens that is curved outward on both sides, resembling the intersection of two spheres. This type of lens causes parallel light rays to converge or come to a point after passing through it. The radius of curvature for a convex surface is positive by convention, which helps in the lens-maker's equation for calculating the focal length of the lens.

Convex lenses are widely used in various optical devices such as microscopes, telescopes, cameras, and eyeglasses to correct farsightedness by focusing light rays onto a specific point, resulting in a clear image.

A train travels 120 km In 2 hours and 30 minutes what’s its average speed

Answers

Formula for distance is d=st
so for speed is s=d/t
48 km per hour

Speed= distance / time or s=d/t.

120 / 2.5 (2.5 is 2 hours and 30 minutes.) = 48 km/h

A transformer has 20 turns in its primary coil and 60 turns in its secondary coil. The input voltage for the transformer is 25 volts. What is the output voltage?

Answers

As, the transformer works on the principle of mutual induction between two coils.So, according to Faraday's law,
induced emf=-number of turns in coil *[change in flux per unit time]
write above equation in formula form,
V= -N[ΔФ/Δt]
Now, write the above equation for both primary and secondary coils of transformer and equate them(as ΔФ/Δt remains same for both of them):
we get the relation:
V_{s} / V_{p}=N_{s} / N_{p}
s stands for secondary coil.
p stands for primary coil.
By putting the values:
V_{s}/25=60/20

V_{s}=75volts (output voltage).[tex] [/tex]

What are the short eruptions of intense high-energy radiation from the sun's surface called? Corona Prominences Solar flares Sunspots

Answers

Short eruptions of intense high energy radiation from the Sun's surface are called solar flares. The appropriate answer is C. Solar flares usually does not last more than one hour. But during that time , the temperature of the solar flare region can be twice that of the rest of the sun's surface. Huge amounts of energy are released into space during a solar flare.

The answer is Solor flare, this is because this is a sudden eruption of energy that is magnetic on or even near the surface of the star, the sun.

Hope this helps!

1. Describe the formation of the four types of fronts and the weather associated with each

2. How does the burning fossil fuels influence global temperature. How might the change in temperature affect other parts of Earth, such as the hydrosphere and biosphere

Answers

1. Cold front

Warm front

Stationary front

Occluded front

30 POINTS! (Question is located in picture under graph)

A) The variables are plotted along incorrect axes.
B) The unit of the variable on the y-axis is incorrect.
C) The scale for each axis is not appropriate for the data.
D) The data points have not been plotted clearly.
E) The data points have not been plotted accurately.

Answers

Answer:

B) The unit of the variable on the y-axis is incorrect.

Explanation:

The question to this exercise is in the picture. It is '' What makes the above graph incorrect? ''

Let's analize each option :

A) The variables are plotted along incorrect axes. This is wrong because actually the graph is well-plotted. In a displacement versus time graph we put the time variable in the x-axis and the displacement variable in the y-axis.

B) The unit of the variable on the y-axis is incorrect. This is true. In the graph we can see that [tex]''Displacement(\frac{m}{s})''[/tex] when the units of displacement are units of lengths such as meters or miles for example. Therefore, the B) is a correct option

C) The scale for each axis is not appropriate for the data. This is wrong. Because of the scale for each axis we are able to see the five data points which are (1,2) ; (2,4) ; (3,6) ; (4,8) and (5,10)

D) The data points have not been plotted clearly. This is wrong. All data points are well-plotted signposted with a point at the intersection of the dashed coordinated lines. For example, the point (1,2) is at the intersection of two lines : one dashed line perpedicular to the x-axis at 1 and one dashed line perpendicular to the y-axis at 2

E) The data points have not been plotted accurately. This is wrong. The data points have been plotted accurately at the intersection of the coordinated dashed lines.

Finally, the only correct option is B)

The surface features of ________ are known only through satellite radar mapping. jupiter mercury venus mars

Answers

The surface features of VENUS are only known through satellite radar mapping. Venus is the second planet from the sun and it is blanketed by a thick atmosphere mainly of carbon dioxide and thick clouds of mostly sulfuric acid. The amount of carbon dioxide in the atmosphere is responsible for the high atmospheric pressure experienced on the planet. The Pioneer Venus Orbiter was the craft used to undertake the radar mapping of the Venusian surface.

Sasha uses a basketball and a tennis ball to represent two astronomical bodies based on their sizes. Which of the following representations is the most correct based on what Sasha has? The basketball represents Earth and the tennis ball represents the solar system. The basketball represents the moon and the tennis ball represents the solar system. The basketball represents the solar system and the tennis ball represents Earth. The basketball represents the solar system and the tennis ball represents the Milky Way.

Answers

If you are comparing the sizes of the astronomical bodies using the basketball and the tennis, then you can think of the basketball as the bigger astronomical body and the tennis ball the smaller one.

If you look at your choices, you are left with the basketball represents the solar system and the tennis ball represents Earth. This is because the solar system is bigger than the Earth.

The other choices shows the bigger astronomical bodies represented as the tennis ball.

Answer:

Explanation:

im doing the test rn but i think this is right correct me if im wrong also have a good day or night

HELP ASAP

A roller coaster is 1/2 way down, what form of energy does this roller coaster have at this point?

KINETIC, POTENTIAL, OR BOTH KINETIC AND POTENTIAL ENERGY?

Answers

It has both kinetic and potential

it would have both KINETIC ENERGY and POTENTIAL ENERGY.

The wheel and axe is a modified incline plane

A.True
B.False

Answers

B False it is not a modified incline plane

The wheel and axle is essentially a modified lever, but it can mover a load farther than a lever can. The center of the axle serves as a fulcrum.

Four springs are stretched to the same distance from the equilibrium position. The spring constants are listed in the table. Which lists the springs based on the amount of elastic potential energy, from greatest to least? X, Y, W, Z X, W, Y, Z Z, W, Y, X Z, Y, W, X

Answers

The correct answer is: X, W, Y, Z

In fact, the elastic potential energy of a spring is given by
[tex]U= \frac{1}{2}kx^2 [/tex]
where k is the spring constant and x is the stretching of the spring with respect to its rest position.

In this problem, all the four springs are stretched by the same distance x. This means that their difference in potential energy is due only to the difference between their spring constant: the larger the spring constant, the greater the energy. Therefore we can list the springs from the one with largest spring constant to the one with smallest constant, and this list corresponds to listing the springs from the one with largest energy to the one with smallest energy:
X, W, Y, Z

Answer:B

Explanation:

XWYZ

What type of roadway has the highest number of hazards per mile?

Answers

the roadway with the highest number of hazards is city streets

The roadway with the highest number of hazards per mile is city roads and street.

The city has a high population of people, this is a combination of both men and women. These categories of people need vehicles to move around the city, they need it go to the office, school, markets and so on.

Due to the high number of individuals in the city there tend to be a high level of traffic, this can lead to accident or other type of road hazards.

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Strictly speaking, when an object acquires a positive charge by the transfer of electrons, what happens to its mass? (think small.)

Answers

An electron is 1/1836 of the mass of the proton. So, losing that little mass (0.51 MeV/c2) or gaining it changes the overall mass, but so small that it is hard to detect. hope this helped!:)

Which of these is NOT large and gaseous?
A) Jupiter
B) Mercury
C) Saturn
D) Uranus

Answers

Mercury.
____________

The answer is Mercury, Because it is a small and non=gaseous planet

hope this helped :D

The graph shows the solubility of different compounds at different temperatures. Solubility refers to how much of something will dissolve in the given amount of water at a particular temperature. ________ shows the greatest change in solubility over the temperature range shown. A) KBr B) KNO3 C) NaCl D) NaClO3

Answers

Answer:

Explanation:

From the graph, it is clear that potassium nitrate, KNO₃ undergo great change in solubility over the temperature range.

What is solubility?

Solubility of a substance is the fraction of its concentration which is dissolved in a solvent at a specified temperature. Solubility of a substance is dependent on the nature of both solute and solvent.

The factors which determine the solubility of a solute are its bond types, molecular weight, temperature and pressure. As the temperature increases, the intermolecular force attraction between solute molecules decreases leading to solvent- solute interaction results in greater solubility.

From the graph it is clear that solubility of KNO₃ changes rapidly with temperature. Whereas , other compounds dose not show this steep curve with increase in temperature. Thus option B is correct.

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An ac generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?

Answers

The correct answer is: Average Power = 500 W

Explanation:
Root-mean square voltage = Vrms = Vpeak /√2 = 100 / √2 volts
Resistance = R = 10 Ω
Average power = Pavg = (Vrms)^2 / R = (100 * 100) / (2 * 10) = 500 W

Subtitle is the half-life of an element is 10 years how many half-lives will it take before only about 6% of the original sample remains

Answers

We can solve this problem by using the equation
as shown: A=Aoe^-(ln2/t)T where A is the final amount (0.06 gram), Ao is
the initial amount (1g *assumed), t is the half-life (10 years ) and lastly T
time elapsed (required). Plug in the values in the equation and you should
get 40.5 years and this is approximately 4 half-lives.

All of the following statements describe how rubbing one object on another creates static electricity except:

A. Rubbing converts neutrons to protons, increasing the charge.
B. Charge is transferred from one object to the other.
C. The electrons get ripped off one object and held by the other.
D. Rubbing allows the object that has the greater electron attraction to take them.

Answers

rubbing converts neutrons to protons, increasing the charge (APEX)

Answer:

A. Rubbing converts neutrons to protons, increasing the charge

Explanation:

Rubbing two objects creates static electricity. It is also known as charging by friction. When two objects having different electron affinity are rubbed together, the one with greater electron attraction rips off the electrons from other object. In this way charge is transferred from one to another. The one losing the electrons becomes positively charged and the one gaining the electrons becomes negatively charged. Neutrons do not convert to protons. Thus, this is a wrong statement.

Noise caused by not understanding somebody's accent is considered:

A) semantic
B) temporal
C) internal
D)external

Answers

The answer is more likely letter A.) semantic

Answer:

semantic.

Explanation:

100% correct

What do astronomers mean when they say that the universe is isotropic?

Answers

If you stand at the center and look in every direction the universe will look the same.

Which organelles is used to transport materials through the cell

Answers

Hello.

The answer is cell membrane.

Have a nice day

Signs of fatigue while driving include __________.

A. sore eyes and muscles
B. lapses in short-term memory
C. sore eyes, sore muscles, and lapses in short-term memory

Answers

I would say C. is the answer.

Answer:

C. Sore eyes, sore muscles, and lapses in short term memory

Explanation:

Fatigue refers to an overall feeling of tiredness or a lack of energy in accomplishing tasks, e.g. driving.

Causes of fatigue while driving include;

a lack of quality sleep driving when you would normally be sleeping (overnight) sleep disorders such as sleep apnoea, a sleeping condition that causes tiredness throughout the day.

Symptoms of fatigue while driving

Fatigue is easy to detect, with symptoms including:

yawning sore or heavy eyes slower reaction times due to memory short-term lapsesdaydreaming while driving driving speed creeps up or down impatience impaired driving performance such as poor gear changes stiffness and cramps loss of motivation

ANALOGY: Mars bar: planet as Milky Way: __________

Star cluster

Candy bar

Constellation

Galaxy

Answers

galaxy is the answer

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