Remember the headline: ENERGY IS NEVER CREATED OR DESTROYED
The amount of energy before and after are always equal. All we ever do with energy is move it around from one place to another.
a). A crane can't create energy. Lifting the same rock in 20 different ways always takes the same amount of work. It doesn't matter whether one person picks the rock straight up, or 50 people get around it and lift it, or roll it up a ramp, or lift it with 16 pulleys and a mile of rope, or use a giant steam crane.
You want to lift a 2200N weight up 25m, you're going to have to supply
(2200N) x (25m) = 55,000 Joules of work.
c). YOU put out 55,000 Joules of energy. It had to GO someplace. Where is it now ? ===> It's the potential energy the rock has now, from being 25m higher than it was before. That 55,000 Joules is NOW the potential energy of the rock.
No energy was created or destroyed. It just got moved around.
55,000 Joules of energy began as nuclear energy in the core of the sun. Solar radiation carried it to the Earth. Plants absorbed it, and stored it as chemical energy. You ... or a cow that you ate later ... ate the plants and took the chemical energy. One way or the other, the chemical energy got stored in your blood and fat. When you needed to put it out somewhere, you moved it into your muscles, and they converted it into mechanical energy. Then you used the mechanical energy to exert forces. Today, you used the original 55,000 joules to lift the flagstone, and NOW that energy is in the flagstone, 25 meters up off the ground !
The potential energy of the flagstone when it is 25m above the ground is 55000J.
The question concerns two aspects of physics: calculating the work done on an object and understanding the concept of potential energy. First, you correctly calculated the work done on the flagstone as 55000J. Now, for the potential energy of the flagstone when it is 25m above the ground, we use the formula for gravitational potential energy, which is P.E = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m/s2 on the surface of the Earth), and h is the height in meters.
To find the mass (m) of the flagstone, we use the relationship F = ma where F is the force (weight in this case, which is 2200N) and a is the acceleration due to gravity. This gives m = F/g. Substituting the values, we get the mass of the flagstone which allows us to calculate its potential energy at a height of 25m, using P.E = mgh.
It's important to understand that the potential energy of an object is directly related to its height above the ground and represents the energy stored within the object due to its position. In this case, assuming the flagstone is lifted vertically and no energy is lost, the potential energy at 25 meters would be equal to the work done to lift it, which is 55000J.
The metric unit of force is the _____.
A.newton
B.pound
C.kilogram
D.watt
A force is calculated in neutons
Answer: newton
Explanation:
Ways of thinking, feeling, or acting that are unusual are _____ of a mental disorder.
A.always a part
B.unusual aspects
C.functions
D.symptoms
Ways of thinking, feeling, or acting that are unusual are symptoms of a mental disorder.
Answer: Option (D) is the correct answer.
Explanation:
When a person thinks, feels or acts in ways which are not normal or which are unusual in many ways then this activity is considered as symptoms of a person's behavior.
For example, a women argues with everyone without any reason.
So, when a person suffers from some any mental disorder then he doesn't know what he is saying, doing or expressing.
Hence, we can conclude that ways of thinking, feeling, or acting that are unusual are symptoms of a mental disorder.
Which is not part of John Dalton’s atomic theory?
a. All elements are composed of atoms.
b. Atoms of different elements have different masses.
c. All atoms of the same element have the same mass.
d. Atoms are made up of smaller particles.
The aspect not part of John Dalton's atomic theory is 'Atoms are made up of smaller particles.' Dalton's postulates did not acknowledge subatomic particles as he viewed atoms as indivisible and the smallest particles.
Within John Dalton's atomic theory, several postulates outline his early understanding of the atomic structure. Based on the provided excerpts, the answer to which is not part of John Dalton's atomic theory is d. Atoms are made up of smaller particles.
Dalton's theory emphasized the indivisibility of atoms; he considered atoms as the smallest, indivisible particles and did not acknowledge that atoms could be split into subatomic particles such as protons, neutrons, and electrons. This contrasts with modern understanding, which recognizes that atoms indeed consist of smaller subatomic particles, but during Dalton's time, such knowledge had not yet been discovered.
The first two postulates of Dalton's atomic theory correctly state:
All elements are composed of atoms.Atoms of different elements have different masses.All atoms of the same element have the same mass.However, subsequent scientific discoveries have shown that even these points have exceptions, such as the existence of isotopes with different masses within a single element.
A ball is kicked horizontally at 10.0 m/s from a cliff 100m high. How far from the base of the cliff will the stone strike the ground?
a
1,000
b
60
c
10
d
3010.2
e
45
We study the motion of the ball on the two coordinating needles Ox and Oy, originated on the ground. On Ox the ball has a uniform straight motion with the velocity vx = vo and the equation of motion is x = vo * t, and on the ball Oy has a movement uniformly accelerated with acceleration g and no initial velocity on the axis Oy v_oy = 0 (free fall), so the equation of motion is y = h-gt² / 2.The equation of the trajectory is obtained by eliminating the time from the two equations. We hold t = x / vo => y = h-gx²/2vo².The trajectory is a parabola because y is a second degree function of x. Bila arrives on the ground when y = 0 => t =√(2h/g)=√(2*100/9.8)=√20.4=4.51 s
The ball will fall towards the rock at a distance d = vo * t =10*4.51≈45 m
The correct answer is e
By now, you know that sound is produced by vibrations. These vibrations can travel through solids, liquids, and gases, but not through ______________.
Answer:
empty space
Explanation:
Causes an increase in the kinetic energy of atoms within an element and an increase in the kinetic energy of molecules or ions within a compound
heat being supplied might do
A person walks 25 m east 35 m north 25 me west and 5 m south. What's the distance traveled?
A hippogriff is a large flying creature that Hagrid watches over at Hogwarts. if the Hippogriffs mass is 1300kg then what is it’s weight? (Remember that the acceleration of gravity is -9.8m/s^3). Use the formula w=m•g
Show all your work
Answer:
12,740 N
Explanation:
The weight of the hyppogriff is given by:
[tex]W=mg[/tex]
where
m = 1300 kg is the hippogriff's mass
g = 9.8 m/s^2 is the acceleration due to gravity
Substituting the numbers into the equation, we get:
[tex]W=mg=(1300 kg)(9.8 m/s^2)=12,740 N[/tex]
The answer is 12,740 i just did test
A dog pushes a toy horizontally on a frictionless floor with a net force of 2.0\, \text N2.0N for 1.0\,\text m1.0m. How much kinetic energy does the toy gain?
Answer:
2.0 J
Explanation:
Since the surface is frictionless, we can solve the problem by using the work-energy theorem, which states that the work done on the toy is equal to the kinetic energy gained by the toy:
[tex]W=\Delta E_k[/tex]
where
W is the work done on the toy
[tex]\Delta E_k[/tex] is the kinetic energy gained by the toy
The work done can be calculated as the product between the force applied on the toy and its displacement, so:
[tex]W=Fd=(2.0 N)(1.0 m)=2.0 J[/tex]
Therefore, according to the work-energy theorem, the toy has gained 2.0 J of kinetic energy.
Answer: 2 J
Explanation: Kinetic energy is possessed by a body due to virtue of its motion. A body gains kinetic energy when some work is done on it.
W = Δ K.E.
We know that work is said to be done on a body when a force causes displacement of the body.
W = F.s
It is given that net force on the toy, F = 2.0 N which displaces the toy by, s = 1.0 m.
Hence, work done on the toy, W = 2.0 N × 1.0 m = 2 J which is equal to the kinetic energy gained by the toy.
Injuries can be prevented if you follow the rules, use protective equipment, and know the risks of injuries involved in each sport. Please select the best answer from the choices provided. T F
Answer:
The given statement is true
Explanation:
Injuries are the ones that cut skin, tissues. Injuries include cuts, scratches, scrapes and punctured skin and worst case is fatal.
Normally injury is caused by external force, includes damages done to the body.
Definitely injuries can be prevented if rules are followed, protective equipments are used. Also in each sport, risks of injuries if known measures can be taken to prevent the injuries
The given statement is true
Injuries can be preventable if you follow the rules, use protective equipment is a true statement.
What is Injury?This is defined as harm to the body and is usually associated with pain, bleeding etc.
This can be avoided when performing sports through using protective equipment and risks involved in the sport.
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Which describes the two parts of a measurement? a unit and a symbol a conversion factor and a number a symbol and a conversion factor a number and a unit
The measurement consists in comparing a selected pattern with the object or phenomenon whose physical magnitude is going to be measured, to find out how many times the pattern is contained in that magnitude. That is, it is about identifying or quantifying a particular characteristic or aspect of a particular object or construct.
Now, a well done measurement has two parts:
-The number gives us information about the quantity of the measurement, or in other words, the magnitude of the measurement and its precision.
-The units gives us information about the property that is being measured. This is quite important, because a measurement or result with no units is useless.
Note the units may be expressed with letter or symbols, depending on what we are measuring.
A measurement consists of two important parts: a number and a unit. The number provides the quantity, and the unit indicates the standard of measure.
Explanation:The two parts of a measurement are a number and a unit. For example, if you measure the length of a desk and find it to be 150 cm, '150' is the number, and 'cm' or centimeters is the unit.
The number tells you 'how much', and the unit tells you 'of what'. '150 centimeters' means 150 times the defined length of a centimeter.
Each part is necessary for the measurement to make sense and be useful. Without the number, you wouldn't know 'how much', and without the unit, you wouldn't know 'of what'.
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A student recorded the favorite dipping sauces of 70 people in his class. He wants to plot these days in a circle graph:
What angle should the wedge for honey mustard be?
First, note that a circle has a measurement of 360°.
Note that there are 70 people in all. First, divide 360 with 70
360/70 = ~5.14
Each person's "favorite choice" would be 5.14° of a circle.
Now, solve for honey mustard. There are 10 people who chose honey mustard, so multiply the number above by 10.
5.14 x 10 = 51.4
D. 51.4° is your answer
~
Answer:
51.4
Explanation:
What is the term for a compound made from only two elements?
dual
basic
binary
diatomic
Answer:
Binary
Explanation:
When two compounds are made from specifically only of two elements, that compound is known as binary. Binary compounds can be of two types
1. where two elements are different and only one atom of each element would participate in compound making. some of the examples are:- sodium chloride(one sodium and one chlorine).
2. Where more than one atom of each element participate such as nitrous oxide(two atoms of nitrogen and one of oxygen).
How much current is in a circuit that includes a 9.0 volt battery and a bulb woth a resistance of 4.0 ohms
According to Ohm's law for a portion of the circuit we have:
U=RI=>I=U/R=9/4=2.25 A
Answer:
Current in the circuit, I = 2.25 A
Explanation:
Given that,
Voltage of the battery, V = 9 V
Resistance of the bulb, R = 4 ohms
We need to find the current in the circuit. It can be calculated using Ohm's law. Ohm's law gives the relationship between the current, resistance and the voltage as :
[tex]V=IR[/tex]
[tex]I=\dfrac{V}{R}[/tex]
[tex]I=\dfrac{9\ V}{4\ \Omega}[/tex]
I = 2.25 A
So, the current flowing in the circuit is 2.25 amperes. Hence, this is the required solution.
An atom has a charge of 1+. If the atoms nucleus caintains 23 protons, the atom must have how many electrons
If your atom has a charge of +1, it means you have 1 more proton than electrons. This is because protons have a positive charge and electrons have a negative charge. Because you have 23 protons, and a charge of +1, you have 22 electrons.
what are the factors that effect the strength of a frictional force???
the acceleration of an object
the color and density of an object
the buoyant forces acting on an obeject
the mass of an object and how rough te surface is
If you write down the formula for friction, you will get an answer.
Ff = u * N Where N is a push down force that an object experiences.
u (mu) is a constant and has no units
It may not be accelerating and still experience friction. A is not correct.
Color and Density will not affect the frictional force. B is not so.
Buoyant forces are a different thing altogether. Generally friction has nothing to do with them. C is incorrect.
The last one is your answer. Technically mg should be the answer and not mass, but the second part is correct.
A plane has a cruising speed of 250 miles per hour when there is no wind. at this speed, the plane flew 300 miles with the wind in the same amount of time it flew 200 miles against the wind. find the speed of the wind.
V = speed of the plane with no wind = 250 mph
v = speed of wind
consider the motion of the plane while traveling with the wind :
V' = speed of plane travelling in the direction of wind = V + v = 250 + v
d' = distance traveled = 300 miles
t' = time taken to travel the distance
time taken to travel the distance is given as
t' = d'/V'
t' = 300/(250 + v) eq-1
consider the motion of the plane while traveling against the wind :
V'' = speed of plane travelling against the direction of wind = V - v = 250 - v
d'' = distance traveled = 200 miles
t'' = time taken to travel the distance
time taken to travel the distance is given as
t'' = d''/V''
t'' = 200/(250 - v) eq-2
Given that :
time taken to travel 300 miles = time taken to travel 200 miles
t' = t''
using eq-1 and eq-2
300/(250 + v) = 200/(250 - v)
3/(250 + v) = 2/(250 - v)
750 - 3 v = 500 + 2 v
5 v = 250
v = 50 mph
Increasing the surface area of two objects would drease the heat transfer between them. True or False
i think the answer is true
Which element has a full valence shell of electrons?
A. Magnesium (Mg)
B. Neon (Ne)
C. Chlorine (Cl)
D. Silicon (Si)
I think neon because it is all the way to the right
What is newtons 4th law
Hello!
There is actually no 4th law. There is only 3. The gravitational law is not considered the 4th law.
Hope this helps! Have a lovely day! ~Pooch ♥
In case 1, a block hanging on a spring oscillates with amplitude dd. in case 2, an identical block hanging on an identical spring oscillates with amplitude 2d2d. 1) compare the period of the oscillation in case 1 to the period of the oscillation in case 2.
Answer:
period in case 2 is [tex]\sqrt{2}[/tex] times the period in case 1
Explanation:
The period of oscillation of a spring is given by:
[tex]T=2 \pi \sqrt{\frac{m}{k}}[/tex]
where
m is the mass hanging on the spring
k is the spring constant
Therefore, in order to compare the period of the two springs, we need to find their m/k ratio.
We know that when a mass hang on a spring, the weight of the mass corresponds to the elastic force that stretches the spring by a certain amplitude A:
[tex]mg = kA[/tex]
So we find
[tex]\frac{m}{k}=\frac{A}{g}[/tex]
The problem tells us that the amplitude of case 1 is d, while the amplitude in case 2 is 2d. So we can write:
- for case 1:
[tex]\frac{m}{k}=\frac{d}{g}[/tex]
[tex]T_1=2\pi \sqrt{\frac{d}{g}}[/tex]
- for case 2:
[tex]\frac{m}{k}=\frac{2d}{g}[/tex]
[tex]T_2=2\pi \sqrt{\frac{2d}{g}}[/tex]
And by comparing the two periods, we find:
[tex]\frac{T_2}{T_1}= \sqrt{2}[/tex]
So, the period of oscillation in case 2 is [tex]\sqrt{2}[/tex] times the period of oscillation in case 1.
Tamika's mom asked her when her book report is due. Tamika remembered it is due next Friday. What two parts of the brain were involved in forming this memory?
Hippocampus and prefrontal cortex
3)
Which bones are used to determine age?
A) skull, femur, spine, and phalanges
B) radius, ulna, spine, and femur
C) skull, clavicle, sternum, and sacrum
D) femur, sacrum, pelvis, and skull
4)
How many teeth does a human adult have?
A) 25
B) 27
C) 30
D) 32
5)
Shelia was abducted from a school football field, taken to a bank, and forced to withdraw money from an ATM machine. Afterward, she was left abandoned in a car at a local park. Which is the primary crime scene?
A) bank ATM
B) car
C) park
D) football field
Eliminate
D. Femur, sacrum, pelvis and skull
Which statement best describes the motion of the dots?
a) They are slowing down because less distance is covered per unit of time
b) They are speeding up because more distance is covered per unit of time
c) The speed is constant because the distance between the dots remain the same
Provided the dots represent time-lapse snapshots of an object's motion from left to right, then
(a) The underlying object is slowing down because the distance between adjacent snapshots (dots) decreases with time
(the answer is intentionally reworded to avoid sounding nonsensical)
The answer is B or A im pretty sure its B thou
Which vector below goes from (0,0) to (1,-3)?
The vector that goes from (0,0) to (1,-3) can be found by subtracting the initial point (0,0) from the terminal point (1,-3). So, the vector that goes from (0,0) to (1,-3) is (1, -3).
The vector that goes from (0,0) to (1,-3) can be obtained by subtracting the initial point (0,0) from the final point (1,-3). The x-component of the vector is the difference in x-coordinates: 1 - 0 = 1.
The y-component of the vector is the difference in y-coordinates: -3 - 0 = -3.
Therefore, the vector that goes from (0,0) to (1,-3) is represented as (1, -3) in the form of (x-component, y-component). Visually, the vector (1, -3) points from the origin (0,0) in the positive x-direction (to the right) by a distance of 1 unit and in the negative y-direction (downward) by a distance of 3 units.
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A 5.0 kilogram rock rolls off the edge of a cliff. If it is traveling at a speed of 24.2m/s when it hits the ground, what is the height of the cliff?
Using the kinematic equation ;
vf²=vi²+2ad just rearrange for d;
vf²-vi²=2ad;
(vf²-vi²)/2a=d
Now plug the numbers in.
vf=24.2
vi=0
a=9.81=g
(24.2²-0²)/(2*9.81)=29.8 m.
What is a molecule?
A. A group of positive ions surrounded by delocalized electrons
B. A group of ionically bonded atoms
C. Two oppositely charged ions
D. A group of covalently bonded atoms
D isd your answer buddy
HELP ME
How has the discovery and usage of the periodic table benefited society?
Select all that apply
It has enabled scientists to communicate chemical discoveries and results more easily.
It has increased scientists' ability to determine how cations and anions form covalent bonds.
It has increased scientists' ability to predict and discover new elements.
It has led to increased knowledge and usage of elements in technological innovations.
Answer: All apply
The periodic table is an arrangement of the chemical elements in the form of a table, ordered by:
-Their atomic number (number of protons)
-Their configuration of electrons
-Their chemical properties
It was progressively developed over time as the scientific knowledge advanced; for this reason many modifications and corrections might be done in the future.
Its usefulness lies in the fact that it allows the existing elements to be organized in a more structured and coherent way, according to the chemical properties they possess. Dividing the table into rows and columns, which represent the periods and groups or families.
Then, with the location and classification of an element according to its group, we can determine how it acts by knowing its chemical and physical characteristics.
This is how with this configuration can be distinguished 4 sets of chemical elements, according to the ease of their atoms to lose or gain electrons, transforming into ions: metals, semimetals, non-metals and noble gases.
This has helped to predict the existence of various elements that have not yet been discovered, because by elements already located in the table and the periodicity found, there are still empty spaces that indicate the composition of the element that has not yet been found.
In addition, this table helps to simplify in some way the teaching of chemical elements and facilitates their learning, as well as their usage in the development of technological innovations.
The periodic table has greatly benefited society by providing a structured framework for scientists to communicate discoveries, predict and discover new elements, and innovate in technology, particularly in the field of electronics.
Explanation:Since its creation in the mid-1800s, the periodic table has been instrumental in advancing both scientific understanding and practical applications. One of the key benefits is that it has enabled scientists to communicate chemical discoveries and results more easily, providing a universal language and structure for chemists around the world. Additionally, the periodic table has been crucial in increasing scientists' ability to predict and discover new elements. Through the recognition of patterns and periodic trends, scientists have been able to infer the existence of elements before they were discovered. Furthermore, the periodic table has paved the way for revolutionary developments in technology. It has led to increased knowledge and usage of elements in technological innovations, such as the use of silicon in semiconductors, which are fundamental to today's electronic devices.
Although the periodic table does not directly increase the ability to determine how cations and anions form covalent bonds, since covalent bonds typically involve non-charged atoms, the understanding of periodic trends and properties of elements, e.g., electronegativity and valency, contribute to a better comprehension of chemical bonding in general. It is the insightful organization of elements that allows scientists and engineers to grasp the properties of elements and their compounds, leading to the development and refinement of myriad materials and technologies.
Sally walks 10 meters forward and then 5 meters backwards. Which statement most accurate describes the magnitude of her displacement and distance traveled?
A) Sally's displacement is 5m less than her distance traveled.
B) Sally's displacement is 10m less than her distance traveled.
C) Sally's displacement is 5m greater than her distance traveled.
D) Sally's displacement is 10m greater than her distance traveled.
Sally's displacement (5m forward) is 10m less than her distance traveled (15m). (B)
Answer:
Sally's displacement is 10 m less than her distance traveled.
Explanation:
It is given that, Sally walks 10 meters forward and then 5 meters backwards. The total path covered by a particle is called total distance covered by it and the shortest path covered by it is called its displacement.
From the attached figure, A is the initial position of Sally. Initially, he moves from A to B. It covers a distance of 10 m then he moves from B to C. So, the total distance covered by Sally is AB+BC = 15 m
While her displacement is AC i.e. 5 m
So, the correct option is (b) i.e. her displacement is 10 m less than her distance travelled.
label the parts of a wave the terms : crest ,trough, frequency, wavelength, amplitude
We have that Crest ,trough, frequency, wavelength, amplitude you will be able to label the wave in Question.
From the question we are told
Label the parts of a wave the terms : crest ,trough, frequency, wavelength, amplitude
Generally
CrestThis is the defined as the vertical distance covered by a wave.
TroughThis speaks of lowest point of a wave the inverse of the crest
FrequencyThis is the is defined as the inverse of
WavelengthThis is defined as the peak to peak distance of a wave
AmplitudeThis defines the maximum height attained by the wave.
Therefore
With above definition of Crest ,trough, frequency, wavelength, amplitude you will be able to label the graph in Question
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