A solid rectangular box with height 4 m and square base with side lengths 2 m is built using a lightweight material whose density is 700 kgm3. Constructing this box requires work against gravity: the required work is
Answers
The work done against gravity to lift the solid rectangular box to its final position is 439,040 J.
Volume of the box can be calculated as follows:Volume = Base area × Height = (2 m × 2 m) × 4 m = 16 m³Since density = Mass/Volume, we can rearrange this formula to find the mass: Mass = Density × VolumeTherefore, the mass of the box is: Mass = 700 kg/m³ × 16 m³ = 11,200 kg
Now, we need to find the work done against gravity to lift the box to its final position. The formula for work done against gravity is: W = F × d × cos θ where W is the work done, F is the force required, d is the distance moved, and θ is the angle between the force and the direction of movement.In this case, the force required is the weight of the box,
which can be calculated using the formula: F = m × g where m is the mass of the box and g is the acceleration due to gravity, which is approximately 9.8 m/s². Therefore: F = 11,200 kg × 9.8 m/s² = 109,760 N The distance moved is the height of the box, which is 4 m. The angle between the force and the direction of movement is 0°, since the force is acting directly upwards.
Therefore, θ = 0°.Substituting these values into the formula for work done against gravity, we get: W = 109,760 N × 4 m × cos 0° = 439,040 J
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Related Questions
Name an element in the same family as sodium
Answers
Answer:
The Alkali Metals
sodium is a member of the alkali metal family with potassium (K) and lithium (Li). Sodium's big claim to fame is that it's one of two elements in your table salt. When bonded to chlorine (Cl), the two elements make sodium chloride (NaCl).
Answer:
Explanation:
Sodium is a member of the alkali metal family, along with potassium (K) and lithium (Li). The fact that sodium is one of two elements in table salt is its main claim to fame. When bonded with chlorine (Cl), the two elements combine to form sodium chloride (NaCl).
When does an object moving in a straight line at constant speed have a non-zero angular momentum?
a) never
b) always
c) sometimes
Answers
Answer: Yes, it can be possible that an object have non zero angular momentum.
Explanation:
There is a concept of frame of reference.
When your frame of reference is not on that straight line where the object is moving then the object will have non zero angular momentum .
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For freely falling objects near earth's surface, _____ is constant.
A
acceleration
B
speed
C
velocity
D
momentum
Answers
The correct option is A. acceleration.
For freely falling objects near Earth's surface, acceleration is constant. An object that is allowed to fall freely under the influence of Earth's gravity is known as a freely falling object. Gravity is an acceleration that acts on any two masses.
For freely falling objects near Earth's surface, the acceleration is indeed constant. This fundamental concept is a result of gravity's influence on objects in free fall. When an object is in free fall, it means that no forces other than gravity are acting upon it. In this scenario, the acceleration experienced by the object remains constant and is equal to the acceleration due to gravity, which is approximately 9.8 meters per second squared (m/s²) near Earth's surface.
The constancy of acceleration in free fall can be attributed to the consistent force of gravity acting on the object. Gravity pulls objects downward towards the center of the Earth, causing them to accelerate uniformly. Regardless of the object's mass, shape, or composition, the acceleration remains constant. This is known as the equivalence principle, which states that all objects experience the same acceleration due to gravity in the absence of other forces.
As an object falls freely, its velocity increases at a steady rate. Each second, the object's velocity increases by approximately 9.8 m/s. This means that in the first second, the velocity increases by 9.8 m/s, in the second second it increases by an additional 9.8 m/s, and so on. The consistent acceleration enables the object to cover greater distances in successive time intervals.
In conclusion, for freely falling objects near Earth's surface, the acceleration remains constant at approximately 9.8 m/s². This constancy arises from the unchanging force of gravity acting on the objects, leading to a uniform increase in velocity over time.
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Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force
Answers
Halfway between the like poles of two magnets, because the field lines bend away and do not enter this area.
How does a magnetic field diagram show where the field is strongest?
The magnetic field lines do not ever cross. The lines include arrowheads to indicate the direction of the force exerted by a magnetic north pole. The closer the lines are to the poles, the stronger the magnetic field (thus the magnetic field from a bar magnet is highest closest to the poles).Where is magnetic field the strongest and weakest on a magnet?
The bar magnet's magnetic field is strongest at its core and weakest between its two poles. The magnetic field lines are densest immediately outside the bar magnet and least dense in the core.Which two locations on the magnet would have the greatest attractive forces?
Inside the magnet itself, the field lines run from the south pole to the north pole. The magnetic field is strongest in areas of greatest density of magnetic field lines, or areas of the greatest magnetic flux density.Learn more about magnetic field
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A moving freight car runs into an identical car at rest on the track. The cars couple together. Compared to the velocity of the first car before the collision, the velocity of the combined cars after the collision is.
Answers
The velocity of the combined cars after the collision is one-half as large.
The collision also called effect, in physics, is the unexpected, forceful coming together in direct contact of bodies, which includes, for an instance, billiard balls, a golf membership and a ball, a hammer and a nail head, railroad automobiles while being coupled together, or a falling item and a floor.
Physicists use collisions to determine the houses of atomic and subatomic debris. Essentially, a particle accelerator is a device that provides a managed collision system among subatomic debris so that, amongst other things, some of the houses of the target particle can be studied. The maximum common motive of an automobile collision is distracted use.
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Knowing the direction of heat flow, explain why if you leave a hot bowl of soup out in the open on the countertop, it eventually gets cold. Where is the heat going?
Answers
The heat will flow towards the air surrounding the soup bowl and towards the countertop below the bowl.
Where does the heat go?We know that when two bodies of different temperatures there will be a flow of heat between the objects, from the hotter one to the colder one.
In this case, we have the bowl of soup as the hot object, and the ambient (the countertop, the air surrounding the bowl, etc) itself will be the cooler object.
Then the heat will flow towards the air surrounding the soup bowl and towards the countertop below the bowl.
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The Coulomb force between two charges q1 and q2 at separation r in air is F. If half of the separation is filled with medium of dielectric constant 9, what will be the value of new coulomb force?
Answers
Answer:
The new Coulomb force is q₁q₂/9πε₀r²
Explanation
The coulomb force between the two charges q₁ and q₂ at a distance r in air is given by F = q₁q₂/4πε₀r².
Now, let us assume the material of dielectric constant κ = 9 is placed between them on the side of the q₁ charge. The value of its effective charge is now q₃ = q₁/κ at a distance of d = r/2 from the q₂ charge.
Since we have air between q₂ and q₃, the coulomb force between them is
F' = q₂q₃/4πε₀d²
= q₂(q₁/κ)/4πε₀(r/2)²
= 4q₂q₁/κ4πε₀r²
= 4/κ(q₂q₁/4πε₀r²)
= 4/9 × (q₂q₁/4πε₀r²)
= q₁q₂/9πε₀r²
So, the new Coulomb force is q₁q₂/9πε₀r²
How is fission used to produce electricity? a. the heat generated from the fission reaction is used to boil water, which rises and spins a turbine. the turbine then turns a generator. b. the fission reaction occurs in a metal chamber that is rotated like a ball. the fission reaction generates a magnetic field which causes the metal chamber to generate electrical discharge as it is rotated. c. the fuel rods are placed between two thermal capacitors. as the thermal energy from fission raises the electrons up an energy level, the capacitors collect the electrons. d. fission cannot be used to produce electricity, only fusion.
Answers
According to the research, the correct option is a. The heat generated from the fission reaction is used to boil water, which rises and spins a turbine.
How is fision used to produce electricity?In fusion, two atoms come together to form a larger one, releasing enormous amounts of energy in the process, this is used by generators to produce electricity.
As a result of nuclear fusion, large amounts of heat are generated that are used to produce pressurized steam, which allows mechanical energy to be obtained to start up electric power generators.
Therefore, we can conclude that according to the research, the correct option is a. The heat generated from the fission reaction is used to boil water, which rises and spins a turbine.
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a stone thrown horizontally from the top of a vertical wall with a velocity of 15m/s,hits the horizontal ground at a point 45m from the base of the wall. calculate the height of the wall. g =10m/s
Answers
Answer:
The height of the wall is 45 m
Explanation:
Horizontal Motion
When an object is thrown horizontally with an initial speed v from a height h, the maximum horizontal distance traveled by the object, also called the range can be calculated as follows:
\(\displaystyle d=v\cdot\sqrt{\frac {2h}{g}}\)
If we know the range and want to calculate the height it was thrown from, we solve the equation for h:
\(\displaystyle h=\frac{d^2g}{2v^2}\)
We'll use the approximate value of g=10\ m/s^2.
The stone was thrown from the top of a wall with a speed of v=15 m/s and it hits the ground d=45 m away from the base of the wall. Calculating:
\(\displaystyle h=\frac{45^2\cdot 10}{2\cdot 15^2}\)
\(\displaystyle h=\frac{2025\cdot 10}{2\cdot 225}\)
\(\displaystyle h=\frac{20250}{450}\)
h = 45 m
The height of the wall is 45 m
Which describes the role of the muscular system during physical activity?
Select all that apply.
1: It allows for movement.
2: It controls the breathing rate.
3: It forces venous blood to return to the heart.
4: It controls the heart rate.
Answers
Answer:
1.It allows for movement.
2.t controls the breathing rate.
4. It controls the heart rate.
Explanation:
A ball rolls off a table and it traveling with a horizontal velocity of 2 m/s and 1 point
has a final vertical velocity of 3 m/s just before it hits the ground. How far
from the base of the table did the ball hit the ground?
Answers
Answer:
The velocity when the ball hits the ground is obtained using v2. 2 = v1. 2 + 2 g Dy with v1=0 and Dy=h. Thus solving for v2 yields 17.1 m/s v2 = 2 g h =.
21 pages·330 KB
Answer:
I e jofh ndoj eohe nc n very nic e
A capacitor is made by taking two sheets of aluminum foil, each 0.022 mm thick and placing between them a sheet of paper which comes from a ream of 500 sheets, the ream being 5.5 cm thick with sheets measuring 216 mm by 279 mm. What is the capacitance of the capacitor made this way if the dielectric constant of the paper is 3.7?
THE ANSWER SHOULD BE (18nF)
Answers
The capacitance of the capacitor if the dielectric constant of the paper is 3.7 : 18 nF
Given data :
Thickness of aluminium capacitor = 0.022 mm
Number of sheets = 500
Thickness of ream = 5.5 cm = 0.055 m
measurement of sheets = 0.216 m by 0.279 m
dielectric constant ( k ) = 3.7
Determine the capacitance of the capacitorwe will apply the capacitance formula below
C = Kε₀A / d
= 3.7 * 8.85*10⁻¹² * 0.216 *0.279 / ( 0.055 / 500 )
= 1.8 * 10⁻⁸F ≈ 18nF
Hence we can conclude that The capacitance of the capacitor if the dielectric constant of the paper is 3.7 : 18 nF
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A sheep is walking at 1.6 m/s. How long will it take to go 3600 m?
Answers
Answer:
2,250 seconds or 37.5 minutes
Explanation:
A DSB-SC modulated signal is transmitted over a noisy channel, with power spectral density of white noise being 0.5x10 watts/Hz. The message bandwidth is 4 kHz and the carrier frequency is 200 kHz. Assuming that average power of modulated wave is 10 Watts, determine output signal-to-noise ratio of the receiver.
Answers
The average power of the modulated wave is 10 Watts and the noise power is 0.5 x 10 Watts/Hz x 4 kHz = 2 Watts. Therefore, the SNR is 10/2 = 5, in decibels, 10 log (10/2) = 7.9 dB.
The signal-to-noise ratio (SNR) of the receiver output is the ratio of the average power of the modulated wave to the noise power.
The SNR is a measure of the power of the signal relative to the noise. A higher SNR means that the signal is more powerful relative to the noise, which means that there is a higher chance of the signal being accurately decoded by the receiver.
In this case, the output SNR of the receiver is 7.9 dB, which is a relatively low value, but still indicates that the signal has a higher power than the noise and is more likely to be decoded correctly.
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Complete question :-
A DSB-SC modulated signal is transmitted over a noisy channel, with spectral density has an power value of white noise being 0.5x10 watts/Hz. The message bandwidth is 4 kHz and the carrier frequency is 200 kHz. Assuming that average power of modulated wave is 10 Watts, determine output signal-to-noise ratio of the receiver.
. Why are the Jovian planets formed from materials different from the terrestrial planets?
a. Terrestrial planets were protected by the asteroid belt between Mars and Jupiter.
b. The composition of elements in a planet was a random process after the big bang.
c. When the solar system first formed, the heaviest elements sank toward the center of the nebulae and the lightest elements floated out.
d. Gaseous Jovian planets, formed farther away from the heat of the Sun, are formed from light weight nebulae "dust."
e. Only the terrestrial planets formed from planetesimals.
Answers
The Jovian planets are formed from materials different from the terrestrial planets for the reason that gaseous Jovian planets, formed farther away from the heat of the Sun, are formed from light weight nebulae "dust."
A Jovian planet, also known as a gas giant, is a huge planet that has a primarily gaseous composition. The Jovian planets include Jupiter, Saturn, Uranus, and Neptune. They are primarily made up of hydrogen and helium, and they have enormous atmospheres.Jovian planets are formed farther away from the heat of the Sun, so they are formed from lighter-weight nebulae "dust." Terrestrial planets, on the other hand, are formed nearer to the Sun, so they are formed from heavier-weight nebulae "dust." The density of the materials that make up the Jovian planets is lower than that of the terrestrial planets due to this. This means that the Jovian planets have lower densities and a greater volume than the terrestrial planets.
Hence, the correct option is d. Gaseous Jovian planets, formed farther away from the heat of the Sun, are formed from light weight nebulae "dust."
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Consider a mixture of soil and water and compare it to a colloid, such as milk. Which property best differentiates these two
Answers
The property that best differentiates a mixture of soil and water from colloid-like milk is the particle size and the ability of the particles to remain suspended or dispersed in the solvent.
In a mixture of soil and water, the soil particles are generally larger and can settle down due to gravity if left undisturbed. The particles in the soil-water mixture are not uniformly distributed and can be separated by physical methods such as filtration or sedimentation.
On the other hand, colloid-like milk consists of much smaller particles, typically in the range of nanometers to micrometers. These particles are small enough to remain dispersed throughout the liquid medium due to a phenomenon called Brownian motion, which prevents them from settling under normal conditions. The milk particles are suspended and distributed evenly throughout the liquid, giving it a homogeneous appearance.
Therefore, the key distinguishing property between a soil-water mixture and colloid-like milk is the particle size and the ability of the particles to remain suspended or dispersed in the solvent.
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A rectangular container of base 50 cm by 30 cm is filled with water to a
depth of 5 cm. How much is the pressure exerted at the base?
(Take pw= 1000 kg/m and g =10 m/s?)
Answers
Answer:
please find attached pdf
Explanation:
Given values are:
Height,
5 cm or, 0.05 mBase of container,
50 cmThe pressure exerted will be:
→ \(P = hdg\)
By substituting the values, we get
\(= 0.05\times 1000\times 10\)
\(= 500 \ Nm\)
Thus the above answer is correct.
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yolanda, whose mass is 38.4 kg, is riding in an elevator that has an upward acceleration of 2.13 m/s2. what force does she exert on the floor of the elevator? if the force is in upward direction, enter a positive value and if it is in downward direction, enter a negative value.
Answers
If the elevator is in the upward direction, the force that Yolanda exerts on the floor of the elevator is 81.792 N.
The force that Yolanda exerts on the floor of the elevator can be calculated using Newton's second law of motion, which states that force is equal to mass times acceleration:
force = mass x acceleration
In this case, Yolanda's mass is 38.4 kg, and the upward acceleration of the elevator is 2.13 m/s². So, we can plug these values into the formula:
force = 38.4 kg x 2.13 m/s²
force = 81.792 N
Since the elevator is accelerating upwards, the force that Yolanda exerts on the floor of the elevator is also upwards, so the answer is positive.
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charlie drove his car around the block at a constant velocity, true or false, why or why not
Answers
Answer:
The given statement is false.
Explanation:
When you change position or direction as well as move rapidly, the velocity changes. So, if you're traveling or moving around over a block, you're shifting a lot of speed but instead, you likely won't it will be at a continuous rate or pace.Along with its quickest-changing direction, it might travel at reasonable acceleration but never of constant velocity.
Which of the following conditions must be met to have electric current flow through
a circuit?
The circuit must be a closed loop.
The circuit must have a source of electric charges (energy).
A potential difference through the circuit must exist.
All of the above conditions are necessary for electric current flow.
Answers
Answer:
all of the above conditions are necessary for electric current to flow
Explanation:
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a cooled cup of coffee having a temperature of 55 °f was heated in a microwave to 130 °f. which statement best describes this process?
Answers
The process of heating a cooled cup of coffee from 55°F to 130°F is an example of endothermic reaction. Endothermic reactions absorb energy in the form of heat and result in an increase in temperature. The coffee absorbs the energy from the microwave, causing its temperature to rise.
Heat reactions, also known as thermochemical reactions, are chemical reactions that involve a change in temperature. These reactions can either be endothermic or exothermic. Endothermic reactions absorb heat and result in a decrease in temperature, while exothermic reactions release heat and result in an increase in temperature. Heat reactions play an important role in many industrial processes such as chemical synthesis, power generation, and food preparation. They can also occur in biological systems, where heat energy is used to drive metabolic processes. Understanding heat reactions is essential for developing sustainable energy technologies, controlling environmental pollution, and improving human health.
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a bullet of mass 25 g is fired from a pistol at a velocity of 200 m/s. if mass of the pistol is 2.5 kg calculate its recoil velocity
Answers
There fore, after the gun is fired, the total momentum must still be zero.
m
g
×
v
g
+
m
b
×
v
b
=
0
Inserting what we know:
(
0.025
)
(
210
)
+
(
0.91
)
v
b
=
o
v
b
=
−
(
0.025
)
(
210
)
0.91
=
−
5.8
m
s
The negative sign tells us that the gun travels in a direction opposite to that of the bullet.
What is the charge on an object that experiences a force of 5 Newtons in an electric field of 50 Newtons per coulomb?
Answers
Answer:
Explanation:
F = qE
F is the force in Newtons
q is the test charge
E is the electrical field produced by the source charge
\(5=q(50)\\q=1*10^-^1Coulombs\)
The magnitude of charge on the object is of 0.1 C.
Given Data:
The magnitude of electric field is, E = 50 N/C.
The magnitude of Electric force is, F = 5 N.
The region where any particle feels the effect of electric force on itself, due to other charged entities, is known as Electric field. And the relation between the electric force and electric field is given as,
F = E × q
Here,
q is the magnitude of charge on the object.
Solving as,
q = F/E
q = 5 / 50
q = 0.1 C
Thus, we can conclude that the magnitude of charge on the object is of 0.1 C.
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What are the formulas for these laws? Please help
Answers
Answer:
Explanation:
you haven't mentioned the laws
The golf club is in contact with the golf ball for 1.8 ms and exerts a force of 1500 N on the golf ball. The mass of the golf ball is 0.045kg Calculate the velocity of the golf ball as it leaves the golf club. Velocity ______________ m/s Thank you :)
Answers
Answer:
Force x time = Impulse which is a change in momentum. You can then use this to find the velocity (as you know the ball's initial momentum is 0)
1500 x 1.8 x 10^-3 = 0.045v
v = (1500 x 1.8 x 10^-3)/0.045 = 60 ms^-1
Explanation:
The distance the ball travels is directly related to the force that is applied from the head of the golf club, the angle at which the force is applied, gravity, as well as air and wind resistance. The force of the club head on the ball causes the ball to compress and apply an equal amount of force on the club.
use ke=1/2mv^2 rearrange for V
The golf club is in contact with the golf ball for 1.8 ms and exerts a force of 1500 N on the golf ball. The mass of the golf ball is 0.045kg then the velocity of the golf ball as it leaves the golf club. Velocity 60 m/s
what is velocity ?Velocity can be defined as the rate at which the change in the position of the object with respect to time, it is mainly involve in speeding of the object in a specific direction.
Velocity is a vector quantity which shows both magnitude and direction and The SI unit of velocity is meter per second (ms-1), the change in magnitude or the direction of velocity of a body is said to be accelerating.
Finding the final velocity is simple but few calculations and basic conceptual knowledge are needed.
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P.E QUESTION
Please match the vocabulary words.
1. isokinetic exercise
2. Olympic-style weight lifting
3.1RM
4. plyometrics
5.isotonics exercise
sport, not an exercise program
muscle fitness exercise that involves movement
the maximum weight that a person can lift once
exercise that builds power
exercise that requires a special machine
Answers
Which of the following situations would violate the second law of thermodynamics?
A. Ice melting in a glass of lemonade on a hot day
B. A cup of lemonade turning to ice in freezing weather
C. A glass of lemonade starting to freeze in a warm room
D. Lemonade being frozen into ice in a freezer
Answers
Answer:
C. A glass of lemonade starting to freeze in a warm room.
Explanation:
This is because there is no source of cold to properly freeze the lemonade, freezing happens when a cold source starts to slow down the movement of atoms. So if there's nothing there to freeze it, it can't freeze.
Alternatively, there are some materials that harden when not subjected to heat, but that's not freezing. It's just cooling.
A positive test charge of 8.5 × 10 negative 7 Columbus experiences a force of 4.1 × 10 negative 1 N calculate the electric field created by the positive test charge also specify the direction of the electric field with respect to the force
Answers
Explanation:
direction of electric field is same as that of force experienced by the test charge
Answer:
Comments/Reasoning Calculations/Results
I used the equation for calculating electric field strength. E = F/q
I substituted the values of F and q in the equation to get
this value of E E= (4.1 x10-1)/(8.5 x10-7)
The electric field strength is 4.8 × 105 newtons/coulomb
Explanation:
edmentum sample answer
A sound wave takes 0.2 seconds to travel 306 meters.
What is the speed of sound in this material? Through
which of the materials in Figure 24.23 is the wave
traveling?
Answers
Answer:
1530 m/s
Explanation:
Given that :
Speed = distance / time
Travel time take = 0.2 s
Distance covered = 306 metres
The speed of sound in the material :
Speed = distance / time = 306 m / 0.2
Speed = 1530 m/s
Name two types of waves. What properties do these waves share?
Answers
Answer:
Waves come in two kinds, longitudinal and transverse. Transverse waves are like those on water, with the surface going up and down, and longitudinal waves are like of those of sound, consisting of alternating compressions and rarefactions in a medium.