The amount of work done by the piano mover in lifting the piano 45938 J (Option A)
What is efficiency?This can be defined as the capacity to achieve a given task with little or no waste. Mathematically, it can be expressed as
Efficiency = (output / input) × 100
How to determine the work inputMass (m) = 300 KgDistance (s) = 12.5 mEfficiency = 0.80Acceleration due to gravity (g) = 9.8 m/s²Output = mgs = 300 × 9.8 × 12.5 = 36750 JInput = ?Efficiency = output / input
Input = Output / efficiency
Input = 36750 / 0.8
Input = 45938 J
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Using the formula for work, Match the Force × Distance problems with their correct "Work Performed" answer. The first example has been completed for you.
Force × Distance = Work Performed
10 newtons 6 meters =60 Nm
1. 62 Nm
40 pounds 100 feet
2. 4000ft.-lbs.
2.5 pounds 24 inches
3. 5 ft.-lbs
62 newtons 1 meter
4. 200ft.-lbs.
1 ton 20 feet
5. 40,000 ft.-lbs.
400 pounds 0.5 feet
If an object is travelling faster than its own sound waves, which of the following is created?
A. wave destruction
B. pressure cooker
C. velocity pulse
D. sonic boom
Help plz
Answer:
D
Explanation:
When an object travels faster than the speed of sound, a sonic boom is created. A ring of pressure waves (probably why wave destruction and pressure cooker are options lol) are created, which is why when you see a jet make a sonic boom there looks like a ring shaped cloud behind it. Hope this helps! For further confirmation/information, just look up sonic boom science (or else you will get sonic boom the video game)
If the crests of two waves overlap, which of the following will be true regarding the new wave formed?
A. The new wave will produce a lower-pitched sound than the two original waves.
B. The new wave will produce a louder sound than the two original waves.
C. The new wave will produce a quieter sound than the two original waves.
D. The new wave will produce a higher-pitched sound than the two original waves.
Answer:
c
Explanation:
Answer: b
Explanation: Constructive Interference – when waves combine to form a wave with a larger amplitude. They add their energies, so when the crests of two waves overlap, they make a higher crest. If two troughs overlap, they make a deeper trough.
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PLEASE HELP!!
What type of exercise are you completing if you contract your muscles to produce movement?
A. concentric
B. eccentric
C. isometric
D. isotonic
Answer:
A
Explanation:
YAYAYAYAYAYA
Use the graph to determine the velocity between 6 and 12 seconds.
-2
m/s
What was the velocity over the entire trip?
m/s Also can someone explain how you got the answers?.
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Read the following information provided from the above link. Answer the following questions.
1. Energy forms are either
gravitational, mechanical, and nuclear.
energy comes in forms that are stored including - chemical,
energy forms are doing work - like electrical, heat, light, motion, and sound.
2. Scientists define energy as
for us
is possible because we have learned how to
and then use it to
3. Energy
along the road and boats through the water. It can bake a cake in the oven, keep ice frozen in the freezer, and
our homes.
4. What are the two basic categories of the seven forms of Energy?
5. Define kinetic energy
6. Define potential energy:
7. Create a T-chart to organize the seven types of energy as potential or kinetic. Give an example of each!
Answer:
for the 1st one its mechanical or nuclear. for the 2nd it is the ability to do work for the 4th one it is Potential energy and Kinetic energy. for the 5th one it is the object has motion or moving. for the 6th question it is when the object is still (not in motion) or is to the opposite of when the object is moving
7 forms of energy ive learned are. medical energy, chemical energy, nuclear energy, heat energy, electrical energy, radiant energy and sound energy.
for the third question the answers are is and even
Explanation:
i just do this in my head and my science notebook, i hope this is wright for you.
also were both in middle school so this might be most of the answers
energy forms are either mechanical or nuclear. nuclear energy comes in forms that ... mechanical ...
tell me if its wrong or anything i just started science or physics like 5-6 months ago
Give three examples of properties of elements
Answer: Atomic number, Atomic Mass, Ionic radius
Explanation:
The three examples of properties of elements are Atomic Number, Melting Point, and Electronegativity are the properties of the element.
Atomic Number: The atomic number of an element is the number of protons found in the nucleus of an atom of that element. Each element has a unique atomic number.
Melting Point: The melting point of an element is the temperature at which it transitions from a solid state to a liquid state. Different elements have different melting points, which can vary widely.
Electronegativity: Electronegativity is a measure of an element's ability to attract electrons toward itself in a chemical bond. It is an important property in determining the nature of chemical bonding and the reactivity of elements. Elements with high electronegativity tend to attract electrons strongly.
Other properties include atomic mass, density, boiling point, reactivity, and many more, which contribute to the diverse behavior and characteristics of elements in the periodic table.
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Determine the displacement and distance covered by a man if he walks 10 m north, turns east and walks 20m, and then turns left and walks 10 m.
Give THREE examples of objects that have potential energy
A ball kept on 3rd floor of a building.
A pendulum bob kept at 3m height
A stone thrown vertically upward.
A pressed spring.
A squashed spunge ball.
What is a way to make magnets?
Heating
Pressure
Freezing
Answer:
Heating is the answer
Explanation:
I took the quiz and i know its a late response
Freezing is a way to make magnets from ferromagnetic substance.
What is Curie temperature?Curie point, also known as Curie Temperature, is the temperature at which the magnetic characteristics of some magnetic materials abruptly change. Remnant magnetism manifests in rocks and minerals below the Curie point, which for magnetite, a common magnetic mineral, is approximately 570 °C (1,060 °F).
In some magnetic materials, atoms that act as small magnets spontaneously align themselves below the Curie point, which for iron is 770 °C (1,418 °F). Because the atomic magnets in each microscopic region (domain) of ferromagnetic materials, such as pure iron, are aligned in the same direction, their magnetic fields reinforce one another.
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(1.) A 0.5 kg basketball rolls off the roof of a building. At a moment when it is 3 m above the ground, it has a speed of 2.5 m/s. What is the total mechanical energy of the basketball ?
(2.) In the previous problem, how much kinetic energy does the football possess just after the throw? Assume that the football started from rest.
Answer:
The answer is C.
Explanation:
Since the total mechanical energy is conserved, kinetic energy (and thus, speed) will be greatest when the potential energy is smallest.
Carlos is making phosphorus trichloride using the equation below.
2P +3Cl2 _PCl3
What coefficient of PCl3 would show that the law of the conservation of mass is represented in the chemical equation?
A.4
B.3
C.2
D.1
Answer:
I think its C. 2 but I am not quiet sure
question 1: what happens if our eyes are not focused on your target?
question 2: using what you know about basketball, why is passing often more efficient than dribbling the basketball
Answer:
You can get hit or miss your shot
it makes it harder for the other person to get the ball
Explanation:
(1.) Consider the equation: 4Fe + 3O2 yields 2Fe2O3
- What is the theoretical yield of Fe2O3 when 12.0g of iron rusts?
- If 14.21 g of Iron (III) oxide is actually produced what is the percent yield ?
(2.) what is the molarity of a 126.81 L solution that contains 5.1 moles of KCl ?
1a. The theoretical yield of Fe₂O₃ obtained is 17.14 g
1b. The percentage yield of Fe₂O₃ obtained is 82.9%
2. The molarity of the KCl solution is 0.04 M
1a. How to determine the theoretical yield of Fe₂O₃Balanced equation
4Fe + 3O₂ —> 2Fe₂O₃
Molar mass of Fe = 56 g/mol
Mass of Fe from the balanced equation = 4 × 56 = 224 g
Molar mass of Fe₂O₃ = (56×2) + (16×3) = 160 g/mol
Mass of Fe₂O₃ from the balanced equation = 2 × 160 = 320 g
SUMMARY
From the balanced equation above,
224 g of Fe reacted to produce 320 g of Fe₂O₃
Therefore,
12 g of Fe will react to produce = (12 × 320) / 224 = 17.14 g of Fe₂O₃
Thus, the theoretical yield of Fe₂O₃ is 17.14 g
1b. How to determine the percentage yield Actual yield of Fe₂O₃ = 14.21 gTheoretical yield of Fe₂O₃ = 17.14 gPercentage yield of Fe₂O₃ =?Percentage yield = (Actual / Theoretical) × 100
Percentage yield of Fe₂O₃ = (14.21 / 17.14) ×100
Percentage yield of Fe₂O₃ = 82.9%
2. How to determine the molarity of the KCl solutionMole of KCl = 5.1 molesVolume = 126.81 LMolarity of KCl =?Molarity = mole / volume
Molarity of KCl = 5.1 / 126.81
Molarity of KCl = 0.04 M
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Calculate: The net force on a rock with a mass of 2.0kg is 19.6N. What is the acceleration of the rock?
Answer:
the acceleration is 9.8
Explanation: F = mA, 19.6 =2A, A = 9.8 m/s^2
Two girls are pulling on opposite ends of a thick rope. Both girls are pulling
on the rope with the same force but in opposite directions. If both girls
continue to pull with the same force, what will MOST likely happen? *
a. One girl will pull the other toward her
b. Both girls will stay in the same place
c. Gravity will cause the rope to sag
d. The rope will break
Answer:
B
Explanation:
It the same amount of force is being used it will cancel each other out.
1.what is gravity?(in your own words)
2.How does gravity cause the planets to move in a circle around the sun?
Answer:
1.Gravity is an invisible force that pulls objects toward each other
2.The suns gravity pulls the planet towards the sun which changes the straight line of direction into a curve
That keeps the planet moving in an orbit around the sun
hope it helped:)
1. Gravity is an imperceptible force that pulls entities toward each other
2. When The sun's gravity pulls the planet towards.
What is Gravity?
The gravitational attraction of the original gaseous significance present in the Universe forced it to begin coalescing and creating stars and caused the stars to group concurrently into galaxies,
So, gravity is accountable for the consideration of the large-scale structures in the Macrocosm.
When the sun transforms the straight line of movement into a curve That preserves the planet pushing in an orbit almost like the sun.
The gravity pulls the sun and the planets concurrently while controlling them apart. The inertia feeds the tendency to preserve speed and keep pushing.
Nevertheless, the gravitational pull desires to reverse the motion to pull the planets into the core of the sun.
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Based on Newton’s 3rd Law of motion, if a baseball player hits a ball with the bat, the action force is the impact of the bat against the ball. Explain where the reaction force can be found.
1. body composition the amount of calories the body uses when it's at rest
2. isometric exercises the amount of fat compared to non-fat tissue in the body
3. isotonic exercises resistance training that does not involve movement
4. resting metabolic rate a harmful increase in blood pressure when a person holds his breath during resistance training
5. Valsalva Maneuver resistance training that involves movement
Answer:
1. body composition 1
2. isometric exercises 3
3. isotonic exercises 4
4. resting metabolic rate 2
5. Valsalva Maneuver 5
Explanation:
Look at the vocab definitions
Answer:
1. body composition 3 resistance training that involves movement
2. isometric exercises 5 a harmful increase in blood pressure when a person holds his breath during resistance training
3. isotonic exercises 2 resistance training that does not involve movement
4. resting metabolic rate 1 the amount of fat compared to non-fat tissue in the body
5. Valsalva Maneuver 4 the amount of calories the body uses when it's at rest
Explanation:
vocabs match with the term next to it
which is the stronger acid?
A pH 1
B pH 4
C pH 8
D pH 13
The picture below shows an experiment to find out the highest frequencies which students can hear. When the teacher turns the dial the frequency from the loudspeaker increases. the students put their hands down when they can no longer hear the sound.
Some students put their hands up while others have put their hands down. What conclusion can you draw from this observation?
The teacher suspects that some of the students are not giving honest responses, they are keeping their hands up even when they can no longer hear the sound. How could he check if he is right? *
A crowbar with the length of 200 cm is used to lift the load of 600 Newton . If the distance between fulcrum and load is 0.75 . Calculate Effort , Mechanical advantage and Velocity ratio
Answer:
a. Effort = 960 Newton
b. Mechanical advantage (M.A) = 0.625
c. Velocity ratio (V.R) = 1.67
Explanation:
Given the following data;
Load = 600 N
Length of crowbar = 200 cm
Length of load arm = 0.75 m
Conversion:
100 cm = 1 m
X cm = 0.75 m
Cross-multiplying, we have;
X = 0.75 * 100 = 75 cm
First of all, we would find the effort arm;
Effort arm = length of crow bar - length of load arm
Effort arm = 200 - 75
Effort arm = 125 cm
Next, we would determine the mechanical advantage (M.A) of the crow bar;
Substituting the values into the formula, we have;
M.A = 0.625
To find the effort of the crow bar;
Making "effort" the subject of formula, we have;
Effort = 960 Newton
Lastly, we would determine the velocity ratio (V.R);
V.R = 1.67
Answer:a. Effort = 960 Newton
b. Mechanical advantage (M.A) = 0.625
c. Velocity ratio (V.R) = 1.67
Explanation:
What 2 factors is potential energy (PE) dependent upon
Answer:
The mass and gravity.
Explanation:
Depending on how much mass there is in an object, will determine how fast/slow and object moves. This is the same with gravity, if there is a larger slope, there will be more energy, and if there is less there will be less movement.
Answer:
1. the height of the object relative to a reference point
2. its mass
Explanation:
What type of presentation us easier to plan using a site map?
A. a presentation that lets users link our from a “home” page or slide
B. an animation created digitally using a program like Flash
C. a slide show that starts on slide one and goes slide by slide to the end
Answer:
I believe that the answer would be A
Explanation:
because there is all of the examples I found online have a home page.
Based on Newton’s 3rd Law of motion, if a baseball player hits a ball with the bat, the action force is the impact of the bat against the ball. Explain where the reaction force can be found.
Answer:
the reaction force will be found where the bat hits the ball.
Explanation:
Answer:
reaction force will be found where the bat hits the ball
Explanation:
Describe how noise-cancelling headphones modify the sound waves around the user. Your answer should be three to four sentences in length and contain proper grammar and punctuation.
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Which of the following statements is true regarding the constructive interference diagram shown below? Select all that apply.
A. The amplitude of the wave is increased.
B. During interference, the wave will produce a louder sound.
C. The amplitude of the wave is decreased.
D. The crests of two waves are overlapping.
E. The troughs of the two waves are overlapping.
There is more than one answer. Help plz
The statement i.e. true with respect to the constructive interference diagram should be that the two waves should be overlapped.
What is the constructive interference?At the time when two waves of the same kind of wavelength should be in phase so they created the new wave along with the amplitude that should be equivalent to the sum of the inidvidual amplitudes so this we called as the constructive interference
As per the given diagram, we can say that the crest for two waves that should be overlapped should be considered.
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Why would an object have a much lower maximum speed falling through water than falling through air?
Answer:
Explanation:
when objects move through a fluid such as air or water the fluid exerts a frictional force on the moving object. the frictional force from fluid is called a drag force friction drag force causes objects to slow down as they move through a fluid such as air or water.
A simple machine increases __________ to more efficiently use force to do work.
Distance / Displacement
Power
Force
Energy
Please explain your answer.
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Instructions: Choose three activities in your everyday life that involve electromagnetic energy, and fill in the required information below.
________________________________________
Electromagnetic Energy Example One
Activity:
Type of electromagnetic energy:
Picture:
Description of use:
Electromagnetic Energy Example Two
Activity:
Type of electromagnetic energy:
Picture:
Description of use:
Electromagnetic Energy Example Three
Activity:
Type of electromagnetic energy:
Picture:
Description of use:
Answer:
microwave, visible light, and radio waves.
Explanation: