If the input work on a simple machine equals the output work, the
machine is said to be 100% efficient. (This can never actually happen.)
Answer here
physics question please help
list the three components of effective communication and give an example of each
Answer:
The three components of effective communication are:
Sending CommunicationReceiving CommunicationFeedbackExplanation:
1) Sending CommunicationOne should think about what he is going to say, structure his message and focus clearly on a the purpose of sending a message. For example if an employer wants to communicate an employee to improve his performance, he should focus hid communication on the results rather than on his failures.
2) Receiving CommunicationThe person on the other end of the communication should be a good listener. For example in the example given, even if the employer effectively communicates his side of the communication, but the employee is not paying his full attention to what his boss is saying, he wouldn't be able to make much of a difference.
3) FeedbackAfter sending and receiving communication, feedback should be given to complete the communication effectively. For example the employer may tell his boss about what he understood from his boss's speech, or what will he do to improve his performance.
1. You wish to heat 20 kg of water from 40°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?
Answer:
3,343.68kJExplanation:
Heat energy used up can be calculated using the formula:
H = mcΔt
m = mass oof the object (in kg) = 20kg
c = specific heat capacity of water = 4179.6J/kg°C
Δt change in temperature = 80-40 = 40°C
H= 20* 4179.6 * 40
H = 3,343,680Joules
H = 3,343.68kJ
Neutrons do not enter into any ordinary electrical activity
Answer:
Neutrons are the particles which are present in the nucleus of an atom. These have a neutral charge, means that the don't have a positive charge like proton or a negative charge like an electron, but these are far more dense than electrons and protons. Under normal reaction, neutron may seem to just exist, as usually electrons are the particles which forms bonds or breaks them.
However, Neutrons play an important role in the weight and Radioactive properties of a material. During radioactive decay, which occurs in radioactive elements, the nucleus of an atom breaks down and releases energy and matter, which is primarily due to the knocking out of a neutron. These knocked out neutrons forms the basis of the nuclear fission and fusion reactions.
what can be done to double the power output of an object?
Answer: double the speed of the object.
Explanation:
From the definition of power, power is the rate at which work is done. That is,
Power P = Work done/time
But
Work done = force × distance
Work done = F×S
Substitute F × S for work done on power formula.
P = (F×S)/t
P = F × S/t
But S/t = velocity V
P = F × V
Since power P is proportional to speed V, to double the power output of an object, the speed V of the object must be doubled.
Answer:
double speed
Explanation:
What are factors that would change the position of the wave lengths measured? (There are more than one answer.) a) size of the tube b) tuning fork frequency c) distance between the tuning fork and tube d) room temperature e) area of the tube
Answer:
Tuning fork frequency
Room temperature
Explanation:
During which type of collision do the two objects stick together?
A. Elastic
B. Inelastic
C. All collisions
D. Perfectly inelastic
Answer:
D. Perfectly inelastic
Explanation:
Kinetic energy is lost so the two bodies stick together.
Tina and her puppy are tugging on a rope, each pulling on opposite ends.
When is Tina doing work?
O the entire time she plays with the puppy
o whenever she pulls the puppy toward her
O when she holds the rope steady as the puppy pulls it
O when she lets go of the rope and the puppy pulls it away
C. When she holds the rope steady as the puppy pulls it
Explanation:
because she is having to stay still as the force on the other end is pulling away, this is causing her body to work
According to the information, Tina is doing work when she holds the rope steady as the puppy pulls it. Thus, the correct option for this question is C.
What is work done in terms of physics?In terms of physics, work done may be characterized as the product of the component of the force in the direction of the displacement and the magnitude of this displacement. The formula for calculating work done is as follows:
Work done = Force (F) × Displacement (D).According to the context of this question, when Tina and her puppy are tugging on a rope, each pulling on opposite ends. The work done by both is estimated when they hold and pull the rope toward their side. The more they stretch the more work is performed by them.
Therefore, Tina is doing work when she holds the rope steady as the puppy pulls it. Thus, the correct option for this question is C.
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How does population density differ from population size?
а. Population size takes all organisms into account while population density only takes specific age
groups of the population into account
b. Population size is the total number of organisms, while population density is the total number of
organisms within a given area
C Population size is the total number of organisms within a given area, while population density is the
total number of organisms of a specific age
d. Population size is the total number of organisms of all species, while population density is the total
number of organisms of a specific species
Answer: B
Explanation:
Population size focuses on the size of the population. That is, the total number of organisms in a population.
While population density focuses on the density of the population. That is, mean number of organisms per unit area or volume.
Therefore, Population size is the total number of organisms, while population density is the total number of
organisms within a given area
A velocity vs. time graph is shown. A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, velocity in meters per second on the y axis, numbered 0 to 20. A line starts at the origin and ends at (5, 20). What is the acceleration of the object? 0 m/s2 0.25 m/s2 4 m/s2 8 m/s2
Answer:
C
Explanation:
Given that a line starts at the origin ( 0, 0) and ends at (5, 20)
Where
V1 = 0
V2 = 20
T1 =0
T2 = 5
The slope or gradient of a velocity time graph is the acceleration.
Slope = change in V/ change in t
That is,
Slope = ( V2 - V1 )/ ( T2 - T1 )
Substitutes all the values into the formula
Slope = ( 20 - 0 )/( 5 - 0 )
Slope = 20/5
Slope = 4 m/s^2
Therefore, acceleration of the object is 4m/s^2
Answer:
The first answer is -20m/s
Explanation:
On EDGE 2021
Least
C
B
A
Greatest
i dont know if this is the same question as yours lol
Question 1
A 10 N block is at the bottom of a frictionless incline as shown to the right. How much work must be done against gravity to move it to the top of the incline?
A)600j
B)1000j
C)4800j
D)800j
Answer:
W = 600 J
Explanation:
We have,
According to attached figure,
Height of the inclined plane is 60 m
Force acting on the block is 10 N
It is required to find the work must be done against gravity to move it to the top of the incline. The work done is given by :
W = mgh
or
[tex]W=F\times h\\\\W=10\times 60\\\\W=600\ J[/tex]
So, the work done against the gravity is 600 J.
A 4.0 kg block is resting on a rough horizontal table. The coefficient of static friction us is 0.60. The static friction between the block and the table before any attempted motion is to start is N. (round to the nearest integer)
Answer: 24 N
Explanation:
Given that the
Mass m = 4 kg
Coefficient of friction (μ) = 0.60
To calculate the static friction between the block and the table before any attempted motion, you will use the formula; F = (μ)N
Where
F = static friction
N = normal reaction = mg
g = acceleration due to gravity = 9.8 m/^2
Substitutes m, g and (μ) into the formula
F = 0.6 × 4 × 9.8
F = 23.52 N
Therefore, the static friction between the block and the table before any attempted motion is 24 N approximately.
The static friction between the block and the table before any attempted motion is to start equals 23.52 Newton.
Given the following data:
Mass of block = 4.0 kgCoefficient of static friction = 0.60.To determine the static friction between the block and the table before any attempted motion is to start:
Mathematically, the force of static friction is given by the formula;
[tex]F_s = uF_n[/tex] ...equation 1.
Where;
[tex]F_s[/tex] represents the force of static friction.μ represents the coefficient of friction.[tex]F_n[/tex] represents the normal force.But, [tex]F_n = mg[/tex]
[tex]F_s = umg[/tex] ...equation 2.
Substituting the given parameters into eqn. 2, we have;
[tex]F_s = 0.60 \times 4 \times 9.8\\\\F_s = 23.52\; Newton[/tex]
Force of static friction = 23.52 Newton
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How may the desire for a perfect lawn related to environmental pollution
Answer:
Lawns are extremely costly in many ways, including dollars spent on them, the deadly ... Using lawn equipment also significantly adds to noise pollution. ... to all of the environmental damages, including water pollution, caused by fracking. ... ONE's ambition is to remain unbiased and to provide a good
Explanation:
Answer:
The gases from the lawn mower to mow the grass, weed killer toxicity affects, too much of the seeds to help grow your grass can actually harm your grass, etc.
Explanation:
The formation of a product in the reaction is based on what
Answer:
c
Explanation:
there is formation of products when t reactants react or collied
As hotter material _______, ________material sinks. a. Sinks, colder b. Rises, warmer c. Rises, colder d. Sinks, warmer
Answer:
C
Explanation:
Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.
As hotter material gets colder it will sinks down. In the hotter state the molecules gets energetic and gets far apart making them free to rise in the air. Thus option a is correct.
What is sinking ?Hot air is less dense than cold air, which is why hot air rises and cold air descends. The earth's weather is controlled by hot and cold air currents. The planet is heated primarily by the sun, which also generates the planet's hot and cold air energy systems.
Since warm air currents originate over oceans, they frequently bring rain. Tropical storms and hurricanes develop at sea and eventually travel near land for this reason.
As hot air from the earth's surface rises, it rapidly turns into cold air as it approaches space. As hot air cools, it descends back to the earth's surface, where it is warmed by the ocean before rising once more. An example of this is a convection current. Thus, option a is correct.
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How long will a radioactive isotope decay?
Until there's none of it left. Different radioactive isotopes decay at different rates. And a bigger pile of it will last longer than a smaller pile. Without knowing WHICH radioactive isotope you're asking about, and how much of it you started out with, the answer could turn out to be anywhere between 1 millionth of a second and 1 million years.
Anyone know the answer to this, would kindly appreciate it
Answer:
The found value of r is:
r = 94.7
Explanation:
We know that
cosθ = Base / Hypotenuse
θ is the always the angle between base and hypotenuse
In this right angles triangle, the angle θ is given 63°.
Which means that the Base is 43 and the hypotenuse is r
Base = 43
Hypotenuse = r
Substitute θ=63°, Base = 43 and hypotenuse = r in the formula of cosθ mentioned above:
cos 63° = 43/r
Rearrange
r = 43/cos63°
r = 43/0.454
r= 94.7
formular for calculating resistors in parallel
Answer:
Answer is 1/RT=1/RT1+1/RT2+1/RT3
If for every increase of 1 for x, y increases by 2, x and y have an) -
relationship
O
A. negative
O
B. linear
O
C. inverse
O
D. circular
SUBMIT
Answer:
The correct option is B.
B) Linear
Explanation:
Suppose initially the value of x is 0, for which y is also 0. When x is increased to 1, the value of y becomes 2. If the value of x is increase to 2, the value of y becomes 4. Similarly, if x is increases to 3,4, and 5, the corresponding values of y we get are 6,8 and 10.
From the above data, we can model that the above relation is:
y = 2x
I've attached the graph of this function below. We can clearly see from the graph that the relation between x and y is linear.
Which is a resource that the National Park Service manages?
A. memorials
B. wildlife refuges
C. ecosystems
D. endangered species
Answer:
Which is a resource that the National Park Service manages?
A. memorials
B. wildlife refuges
Answer:
wildlife refuges
Explanation:
A wave has a wavelength of 15 m and a frequency of 10 Hz. What is the speed of this wave?
Given the values of wavelength and frequency of the wave, the speed at which it was travelling is 150ms⁻¹.
What is Wavelength?Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.
Expression from the wavelength, frequency and speed relation;
λ = v ÷ f
Where λ is wavelength, v is velocity/speed and f is frequency.
Given the data in the question;
Wavelength of wave λ = 15mFrequency f = 10Hz = 10s⁻¹Speed of wave v = ?We substitute our values into the above expression.
λ = v ÷ f
15m = v ÷ 10s⁻¹
v = 15m × 10s⁻¹
v = 150ms⁻¹
Given the values of wavelength and frequency of the wave, the speed at which it was travelling is 150ms⁻¹.
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In an area of the deep ocean, hot magma emerges from a crack in Earth’s crust. Which statement describes what will happen to the seawater above the crack as a result of convection?
Water molecules will break apart and flow in a circular pattern.
Water molecules will bond together and rise upward.
The water will become more dense and sink downward.
The water will become less dense and rise upward.
Answer: D
Explanation:
Hot magma erupts from a crack in Earth’s crust with a very high temperature that will surely break the bond of water molecules in contact. As a result of this, The water molecules will become less dense and rise upward.
Therefore, "The water will become less dense and rise upward " is the best statement to describes what will happen to the seawater above the crack as a result of convection.
The water will become less dense and rise upward because less denser materials move upward and more denser comes downward.
What will happen to the seawater above the crack as a result of convection?The seawater will become less dense and rise upward above the crack as a result of convection because water is less denser and the magma that erupts from the crack is denser due to its high viscosity.
So we can conclude that the water will become less dense and rise upward because less denser materials move upward and more denser comes downward.
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Which graph would you use to show the percentage of cookies sold by each
team?
A. Circle graph
B. Bar graph
C. Stemplot
D. Line graph
Answer:
You would use a bar graph
A country is deciding what to do about pollution given off by power plants.
Which of the following is an example of how science can be used to make this decision?
A. Scientists know what kind of power plants people want.
B. Scientists can measure how much pollution is given off.
C. Scientists are allowed to pass laws about pollution.
D. Scientists own most of the power plants in the United States.
Answer:
The correct option is B
B) Scientists can measure how much pollution is given off.
Explanation:
A) To determine what kind of plants do people want, a polling or a survey is carried out. It is not the job of a scientist to carry that out.
B) Scientist have derived various techniques to measure different kinds of pollution. For example, air pollution can be derived from the Air Quality Index, which measure the quality of the air. The higher the value of Air Quality Index, more is the pollution.
C) Scientists are not allowed to pass any laws regarding pollution. Any kind of laws, including those related to pollution are passed by the Congress.
D) Most of the powerplants in US are owned by private business, while some are under control of the government.
Answer:
Scientists can measure how much pollution is given off.
Explanation:
Use the following to answer question 46
I . increase the current
II. use a stronger magnet
III. use thicker wire
IV. reverse the battery
V. add more coils of wire inside the magnet
46. To increase the force with which the wire is pushed when the switch is closed, which of
the following things could be done?
a. I and II only
b. II, III, and IV only
C. II and IV only
d. I, II and V only
47. A group of students had built a homemade motor and were in the process of trying to
test it. When they hooked it up to their battery they found that the wires in their coil got hot, but the coil would not turn. Of the following solutions, which would be their best
course of action to make the motor spin?
a. add more wire to the coil
b. use a stronger magnet
C. use a higher voltage battery
d. plug into an AC source
Answer:
46.) A
47.) A
Explanation:
46.) To increase the force with which the wire is pushed when the switch is closed, the current flowing through the wire should be increased and the stronger magnet should be used.
Remember that
F = BIL
The force is directly proportional to magnetic field B and current I
a. I and II only
47.) Since the wires in their coil got hot, and the coil would not turn, this is overheating which may be as a result of to much voltage supply compare to the length of the length of the coil of wire. To correct this, more wire should be added to the coil.
Which of the following is not true about centripetal force? Check all that
apply.
A. It's the same as centrifugal force.
B. It's also called an inward force.
C. Centripetal force keeps a car on the road going around a curve.
D. Without centripetal force, an object would continue in a straight
line.
E. Centripetal force is the same as gravity.
multiple answer question
Answer:
A, B Y E
Explanation:
The following is not true about Centripetal Force.
It's the same as centrifugal forceCentripetal force is the same as gravityWhat is Centripetal Force?Centripetal Force is the force that makes a body to move in a curved path. The direction of the force to the motion of the body is orthogonal and it is inward towards the fixed point of the center of rotation.
Therefore, following is not true about Centripetal Force.
It's the same as centrifugal force.Centripetal force is the same as gravity.Learn more about Centripetal Force from the link below.
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Which vector is the sum of the vectors shown below?
Tectonic plates move on which layers of the Earth? a. Crust and upper mantle b. Crust and mantle c. Upper and lower mantle d. Crust, mantle, outer core
Answer:
a. crust and upper mantle
Explanation:
Answer:
a. crust and upper mantle
Explanation:
ASAP please! Three positive charges are arranged as shown in the diagram. Three charges at the corners of an isosceles triangle. The two charges at the base are +5 microcoulombs and +9 microcoulombs and are separated by .32 m. The triangle is .42 m tall up to a charge +3 microcoulombs. The other two sides of the triagle are both .45 m. What is the magnitude and direction of the net electrical force acting on the +3 µC charge? magnitude: 1.75 N direction: 6.2° north of east magnitude: 1.75 N direction: 6.2° south of east magnitude: 1.86 N direction: 21° north of east magnitude: 1.86 N direction: 21° south of east
Answer:
Fn = 1,78 [N]
β = 6,4⁰ north-east direction
Explanation:
As all charges are positive, forces between electric charges located in the cornes of the base of the triangle and the charge located in the top of the isoceles triangle, are repulsion forces. The east-west direction will depend on where the biggest charge is located, if Q₁ = 9 microC, is in the left end of the triangle base then force on charge Q₃ = 3 microC will have direction north-east, if the above mention configuration change (that means Q₁ is in the right end of the triangle base) then the force will have north-west direction. As in the answer solution, 1,75 [N] direction north-east is offer, we will choose the first configuration. According to that:
K = 1/4*π*ε₀ K = 8,98*10⁹ [N*m²/C²]
The angles in the base of the triangle are equals (we call it α )
sinα = 0,42/045 = 0,93
α = 69⁰
cosα = 0,356
And Q₃ = 3 mC = 3*10⁻⁶ C
Q₁ = 9 mC = 9*10⁻⁶ C
Q₂ = 5 mC = 5*10⁻⁶ C
F₁ [Q₁,Q₃] = K*Q₁*Q₃/d² ⇒F [Q₁,Q₃] = 8,98*10⁻⁹ * 9*10⁻⁶ * 3*10⁻⁶/(0,45)²[N]
F₁ [Q₁,Q₃] = 1,2 [N] direction along the side of the triangle therefore
its components are:
F₁ₓ = F₁* cosα ⇒ F₁ₓ = 1,2 * 0,356
F₁ₓ = 0,43 [N]
F₁y = F₁ *sinα ⇒ F₁y = 1,2 * 0,93
F₁y = 1,16 [N]
Now
F₂ [Q₂,Q₃] = K*Q₂*Q₃/d² ⇒F [Q₂,Q₃] = 8,98*10⁻⁹ * 5*10⁻⁶ * 3*10⁻⁶/(0,45)²[N]
F₂ = 0,67 [N]
F₂ₓ = F₂* cosα ⇒ F₂ₓ = 0,67*0,356
F₂ₓ = 0,24 [N]
F₂y = F₂*sinα ⇒ F₂y = 0,67*0,93
F₂y = 0,62 [N]
We must remember F₁ and F₂ are repulsion forces, then components over y-axis have the same sense (we must add then) and components over x-axis have to be subtracted, in this case, the sense is determine by major force component (to the right) according to this:
Fy = F₁y * F₂y = 1,16 + 0,62
Fy = 1,78 [N]
And
Fₓ = F₁ₓ - F₂ₓ = 0,43 - 0,24
Fₓ = 0,19
Net force module is:
Fn = √ (1,78)² + (0,19)²
Fn = 1,79 [N]
Having an angle respect the y-axis:
tan β = 0,19/1,78 ⇒ tan β = 0,11 and from tan tables
β = 6,4⁰ north-west direction
Answer: magnitude: 1.75 N ; direction: 6.2° north of east
Explanation:
It's right
Which changes would result in a decrease in the gravitational force between two objects? Check all that apply
increasing the distance between the objects
decreasing the distance between the objects
increasing the mass of one of the objects
Dincreasing the mass of both objects
decreasing the mass of one of the objects
decreasing the mass of both objects
We need to find how the gravitational force between two object decreases.
The gravitational force between the objects will decrease by
increasing the distance between the objects
decreasing the mass of one of the objects
decreasing the mass of both objects
Gravitational force is given by
[tex]F=\dfrac{Gm_1m_2}{r^2}[/tex]
where
[tex]G[/tex] = Gravitational constant = [tex]6.674\times 10^{-11}\ \text{Nm}^2/\text{kg}^{2}[/tex]
[tex]m_1[/tex] = Mass of one object
[tex]m_2[/tex] = Mass of other object
[tex]r[/tex] = Distance between the two objects
It can be seen that the gravitational force is proportional to the mass of the objects
[tex]F\propto m_1m_2[/tex]
and inversely proportional to the square of the distance between them
[tex]F\propto \dfrac{1}{r^2}[/tex]
So, if mass of one of the objects decreases then the gravitational force will decrease.
Also, if the distance between the objects increases the gravitational force will decrease.
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Answer:
A, E, F
Explanation:
Right on ED2021