You perform 556 J of work lifting a box to a height of 1.3m. How much force did you use to lift the box?
Answer:
The work is given 556 J. Here work is performed horizontally so your distance d=1.3 m
W=F.d
F=W/d =556/1.3 = 427.69 N
Explanation:
if an atom has 3 electrons and 3 protons, what is the charge on the atom
Which of the following is responsible for the formation of sinkholes F. Eroding soil on Earths’s surface G. Ice that builds up on earths surface H. Deposition that has built up at the mouth of the river I. Flowing groundwater that dissolves rock , such as limestone
Sinkholes are commonly formed by acidic groundwater dissolving limestone or other susceptible rock types underground, leading to the collapse of the surface into cavities created by such erosion. The correct answer is I. Flowing groundwater that dissolves rock , such as limestone
The formation of sinkholes is typically the result of groundwater flowing through and dissolving rock formations, such as limestone. When acidic groundwater moves through these rocks, it slowly erodes them, creating underground cavities.
Over time, as the rock continues to dissolve and the cavities grow larger, the land surface above can no longer be supported and collapses, forming a sinkhole. This type of underground erosion is especially effective when the groundwater contains carbonic acid, which is particularly good at dissolving limestone.
Acidic groundwaters and their reaction with basic rock formations like limestone are key in the development of sinkholes. Collapse sinkholes can form abruptly and are often dangerous as they remove support for the surface suddenly. In contrast to other options like eroding soil, ice buildup, or deposition, it is the flowing groundwater that typically leads to these hazardous and sometimes massive geographical features.
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Answer 1) For calculating ΔU;
We can use the expression for the first law of thermodynamics which is,
ΔU = Q + W
Where ΔU is the Change in internal energy, Q is heat added to the system and W is the work done on the system.
As, Q = + 51 KJ and W = -15 KJ.
So, ΔU = 51 -15 = 36 KJ.
Hence, ΔU = 36 KJ
Answer 2) Using the same first law of thermodynamic equation for calculating ΔU (Internal Energy o the system) ;
ΔU = Q + W;
Given, Q = + 100 KJ and W = - 65 KJ
On substituting the values in the above equation we get,
ΔU = 100 - 65 = 35 KJ
Therefore, ΔU = 35 KJ
Answer 3) Using the same first law of thermodynamic equation for calculating ΔU (Internal Energy o the system) ;
ΔU = Q + W;
Given here, Q = - 65 KJ and W = - 20 KJ
On substituting the above values in the equation we get,
ΔU = -65 -20 = - 85 KJ
Therefore, ΔU = - 85 KJ for this system.
Answer 4) According to the answers in 1), 2) and 3) it can be seen that there has been change in the internal energies of the system for all, but some are positive changes and some are negative.
As per the definition of the internal energy, when the system does work on its surroundings, energy is found to be lost, and E is observed to be negative; and when the surroundings do work on the system, the internal energy of the system becomes larger, converting E into positive.
So, it is clear that in case 3) the system did work on the surroundings as E value is found to be negative, rest have positive E values.
What word is used to describe an object that reflects 100% of the incident light?
which object has the most gravitational potential energy
a. a 15 kg at a height of 0.5
b 10 kg at a height of 0.5
c a 10 kg at a height of 0.8
d a 15 kg at aheight of 0.8
The correct option is d.
The object with the most gravitational potential energy is 15 kg mass at a height of 0.8 meters.
To determine which object has the most gravitational potential energy, we'll use the formula for gravitational potential energy:
[tex]\[ U = mgh \][/tex]
Where:
- [tex]\( U \)[/tex] is the gravitational potential energy,
- [tex]\( m \)[/tex] is the mass of the object,
- [tex]\( g \)[/tex] is the acceleration due to gravity (approximately [tex]\( 9.8 \, \text{m/s}^2 \)[/tex]),
- [tex]\( h \)[/tex] is the height of the object above the reference point (in meters).
Now, let's calculate the gravitational potential energy for each object:
a. [tex]\( U_a = (15 \, \text{kg}) \times (9.8 \, \text{m/s}^2) \times (0.5 \, \text{m}) = 73.5 \, \text{J} \)[/tex]
b. [tex]\( U_b = (10 \, \text{kg}) \times (9.8 \, \text{m/s}^2) \times (0.5 \, \text{m}) = 49 \, \text{J} \)[/tex]
c. [tex]\( U_c = (10 \, \text{kg}) \times (9.8 \, \text{m/s}^2) \times (0.8 \, \text{m}) = 78.4 \, \text{J} \)[/tex]
d. [tex]\( U_d = (15 \, \text{kg}) \times (9.8 \, \text{m/s}^2) \times (0.8 \, \text{m}) = 117.6 \, \text{J} \)[/tex]
Comparing the results, the object with the most gravitational potential energy is 15 kg object at a height of 0.8 meters, with a gravitational potential energy of 117.6 J.
what is the diurnal motion of the stars
if a swimmer pushes off a pool wall with a force of 250n, what is her acceleration.
Explain how convections currents cause Earth’s plates to move continuously
The fourth step in the scientific method is
Final answer:
The fourth step in the scientific method is to accept or modify the hypothesis, dependent on whether the experimental data supports or contradicts it.
Explanation:
The fourth step in the scientific method is to accept or modify the hypothesis. After conducting experiments designed to test the hypothesis, a scientist must analyze the data collected. If the data supports the original hypothesis, it can be accepted and the scientist can proceed to the next step. However, if the data does not support the hypothesis, it may either be rejected or modified, often leading to further experimentation. This critical step ensures that scientific theories are continually refined and improved based on empirical evidence.
Consider the acceleration graph. If the mass of the object that is accelerating does not change, but the force applied is tripled, how would the slope of the line change?
Explain what happens to the pitch of a cell phone ringing when the amplitude of a sound wave increases.
the pitch of the cell phone ringing will remains same when the amplitude of a sound wave increases.
The pitch of a sound wave depends on its frequency. more frequency means higher pitch and less frequency means lower pitch. The amplitude of wave is the maximum displacement of the particles of the medium from their mean positions. Increase in amplitude will increase the loudness and not the pitch. So the pitch remains same as the amplitude of sound wave is increased.
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How is sound detected by the brain?
A. Bones amplifying sound
B. Electrical impulses from the ear
C. Electromagnetic waves
D. Vibrations
Please help quick!
Final answer:
Sound is detected by the brain when auditory stimuli (sound waves) cause the eardrum and inner ear structures to vibrate and convert these vibrations into electrical impulses that are interpreted by the brain.
Explanation:
Sound is detected by the brain through a series of processes that begin with auditory stimuli, which are sound waves. These sound waves cause the eardrum to vibrate, and the energy from these vibrations is transferred through the middle ear bones to the cochlea in the inner ear. In the cochlea, the mechanical energy causes the basilar membrane to flex, which then bends the stereocilia on receptor hair cells. This bending activates the receptors, converting the mechanical vibrations into electrical impulses. These impulses are carried to the brain by the auditory nerve, where the brain interprets them as sound.
80 km por hora em metros por segundo
Jonathan has six strings that are the same thickness and are all the same material. He cuts the strings to different lengths and pulls so that they all have the same tightness. Which string will have the highest pitch when he plucks it with his finger?
Your answer is C.
The shortest string will have the highest pitch. This is because the pitch of a sound depends on the speed of its vibrations.
Is energy transformation only occurring at only point 3?
Final answer:
Energy transformation involves various types such as kinetic to potential energy, work to kinetic energy, and is influenced by the parameters of the system, including quantum mechanical constraints and relativistic observations. It can occur at different points, not just one.
Explanation:
Energy transformation in a physical system does not occur exclusively at one particular point unless specified by the conditions or constraints of that system. Different types of energy transformation include the conversion of kinetic energy to potential energy and vice versa, as well as the transformation of work into kinetic energy.
The details provided reference various energy concepts in physics, such as the transformation involved when light from the Sun shines on Earth, and energy conservation as applied to multiple dimensions.
In the realm of quantum mechanics, like the one described by 'equation (3.24)' and determining when one or three energy levels might exist, it typically involves solving the equation with the given parameters 'p' to find the allowed energy states. Alterations to the parameter 'p' could result in different energy states, hence affecting the number of observable energy levels.
Understanding the relationship between energy conservation and the direction of velocity is key when dealing with multidimensional problems.
Additionally, the example of Betty and Alice helps illustrate the relativistic effects on energy when observing a system from different reference frames, underlying the complexity involved when addressing conservation of energy in relativistic contexts.
Frequency is the number of oscillations (or cycles) per
1)Minute
2)hour
3)day
4)second
work transfers what between objects
Answer:
Energy
Explanation:
The answe is "work transfers energy between objects".
There are different types of energy. Work is one of them and is a type of energy in transit.
So work is energy that is exchanged between objects or systems.
When work is done energy is tranferred by mechanical means (if the means are not mechanicals, the type of energy transferred is called heat), for example when pushing a box, energy is transferred to it so that it can move.
When sunlight strikes oil on the surface of water, a variety of colors are observed. What is the best explanation for this observation?
What two simple machines make up a screw?
Which of the following reflect the ideas of Manifest Destiny?
Select all that apply.
The picture below shows the positions of the Earth, Moon, and Sun during an eclipse.
What is true of the eclipse shown in the picture?
A) It is a solar eclipse, in which the Moon casts a shadow on the Earth.
B) It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
C) It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
D) It is a solar eclipse, in which the Earth casts a shadow on the Moon.
Kepler-186f is much closer to the sun than earth is to its sun. why is it considered to be in the habitable zone even though it’s close to a sun
Its sun is cooler than our sun, so there is a possibility that water can exist in liquid state on this planet.
If a forklift raises a 76-kg load a distance of 2.5 m, about how much work has it done?
Final answer:
To calculate the work done by the forklift, we need to find the force exerted by the forklift and multiply it by the distance it raises the load. The force exerted by the forklift can be found using the formula Force = mass x gravity. The work done by the forklift is approximately 1864 Joules.
Explanation:
To calculate the work done by the forklift, we can use the formula:
Work = Force x Distance
First, we need to find the force exerted by the forklift. Since the load has a mass of 76 kg, we can use the formula:
Force = mass x gravity
where gravity is approximately 9.8 m/s^2 (acceleration due to gravity). So, the force exerted by the forklift is:
Force = 76 kg x 9.8 m/s^2 = 745.6 N
Now, we can calculate the work done by the forklift:
Work = 745.6 N x 2.5 m = 1864 J
Therefore, the forklift has done approximately 1864 Joules of work.
Which statement is true about the speed of light waves in a medium?
Depends on the temperature of the light wave
Decreases with a decrease in density of medium
Decreases with an increase in density of medium
Depends on the angle at which the wave strikes the medium
If the earth’s gravity were much less powerful our atmosphere would be similar to
Which star is closest to earth?
A. Polaris
B. the sun
C. the Milky Way
D. Sirius
The answer is "B. The Sun".
HELP ASAP, PLEASE
Which of the following statements is true?
A.Plants don't use respiration to create energy.
B.Animals create energy using photosynthesis.
C.The atmosphere provides plants with carbon dioxide for photosynthesis.
D.The atmosphere provides animals with carbon dioxide for respiration.
Answer:
the other guy is incorrect because animals don't need carbon dioxide for respiration, they breathe in oxygen like us. all of them are incorrect except A.
Answer:
a
Explanation:
Because it is in bae which is breath and exhale
The role of plants in the water, oxygen, nitrogen, and carbon cycles
Plants play a crucial role in the water, oxygen, nitrogen, and carbon cycles. In water Cycle they absorb water through transpiration.
Plants absorb water from the soil through their roots and release it into the atmosphere through a process called transpiration. This helps to regulate the amount of water in the atmosphere, which is essential for weather patterns and the water cycle.
Oxygen Cycle: Plants are the primary producers of oxygen through the process of photosynthesis.
They absorb nitrogen from the soil through their roots and use it to build proteins and other essential compounds.
carbon cycle :During photosynthesis, plants absorb carbon dioxide from the atmosphere and use it to build organic compounds such as sugars, starches, and cellulose.
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describe the shapes of a concave lens and a convex lens
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Both Transverse and Longitudinal Waves transmit _______ and not ______.
Both Transverse and Longitudinal Waves transmit in solids but only Longitudinal waves can transmit in fluids.
What are Transverse and Longitudinal waves?Longitudinal waves are defined as mechanical waves that require a medium for propagation while transverse waves are defined as non-mechanical waves that do not require a medium for propagation. Longitudinal waves have compressions and rarefactions, while transverse waves have crests and troughs.
Longitudinal waves can propagate in liquids but transverse waves cannot. Transverse waves propagate in the direction perpendicular to the medium but longitudinal waves propagate in the same direction with the medium. Both can transmit energy in a solid medium.
Thus, both Transverse and Longitudinal Waves transmit in solids but only Longitudinal waves can transmit in fluids.
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