Jo lifts a 330 N cement block 3.6 m (using a system of pulleys) by pulling 16 m of rope with a force of 121 N.
a. What is the mechanical advantage of the pulley system?
b. What is the work input?
c. What is the work output?
d. What is the efficiency of the machine?
Answer:
a) Mechanical advantage: 2.7b) Work input: 1,936Jc) Work ouput: 1,188Jd) Efficieny: 0.61Explanation:
a. Mechanical advantage
The mechanical advantage of a system of pulleys is the ratio of the ouput force (weight of the object) to the input force (pulling force):
Mechanical advantage = output force / input forceMechanical advantage = 330N/ 121N = 2.727 ≈ 2.7b. Work input
Work is the product of the force applied by the distance traveled in the same direction:
Work input = Input force × input distance = 121N × 16m = 1,936Jc. Work output
Using the law of conservation of energy, the work output is equal to the change in the potential energy of the block:
ΔPotential energy = mass × g × heightΔPotential energy = weight × height = 330N × 3.6m = 1,188JWork output = 1,188Jd. Efficiency
The efficiency is the ratio of the work output to the work input:
Efficiency = Work input / Work outputEfficiency = 1,188J / 1,936J = 0.61You can check that the efficiency is also the ratio of the mechanical advantage to the ideal mechanical advantage
The ideal mechanical advantage is equal to the ratio of the input distance (pulling distance) to the output distance (lift distance):
Ideal mechanical advantage = 16m/3.6m = 4.444Efficiency = mechanical advantage / ideal mechanical advantageEfficiency = 2.727 / 4.444 = 0.61explain the difference between speed and vilocity?
Answer:
The short answer is that velocity is the speed with a direction, while speed does not have a direction.
Explanation:
Speed is how fast an object is moving. It is calculated by the displacement of space per a unit of time. Velocity is the rate at which an object changes position in a certain direction. It is calculated by the displacement of space per a unit of time in a certain direction. Velocity deals with direction, while speed does not.
Answer:
velocity is speed with direction
Explanation:
- Becky leaves home and rides a distance of 30 km H took her 25
hours. What is her speed?
Answer:
1.2
Explanation:
30/25=1.2 so 1.2*25=30
Answer:1.2 hours
Explanation:
distance=30km
Time=25hours
Speed=distance/time
Speed=30/25
Speed=1.2km/hr
name the three basic types of playing positions used in a basketball game.
Answer:
point guard, center, middle
Explanation:
Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.
when work is done by an applied force, the objects energy will change. in this interactive, does the work cause a kinetic energy change or a potential energy change?
for context; the interactive is “It’s all Uphill”.
According to work-energy theorem, when work is done by an applied force, the object's kinetic energy will change.
The work-energy theorem only takes into account net work; it does not take into account work produced by a single force.
According to the work-energy theorem, an object's change in kinetic energy equals the net work performed by the applied forces.
The quantity of internal and mechanical energy that things contain fluctuates as a result of work. Energy is contributed to a system or an item when work is done on it.
The body was initially at rest before the work being performed; it was only after a force was applied that there were energy changes in the kinetic energy.
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Final answer:
In the interactive 'It's all Uphill,' the work done by pushing an object up a ramp increases the object's potential energy.
Explanation:
When work is done by an applied force on an object, it results in an energy change for that object. If the interactive mentioned is 'It's all Uphill,' where the context involves pushing an object up a ramp, the work done would primarily increase the object's potential energy.
This is because as the object is raised to a higher elevation against gravity, it stores more energy in the form of potential energy which could be converted back to kinetic energy if the object were allowed to fall back down.
Work-energy theorem is crucial in understanding these concepts as it states that the work done on an object results in a change in kinetic energy. When the work is done against gravitational force, like pushing an object up an incline, it increases the object's potential energy.
Conversely, when an object is allowed to move downwards, the gravitational force does work on the object, converting its potential energy into kinetic energy.
Real-world examples, such as driving a car, illustrate how forces can do work which either increase kinetic energy (acceleration) or decrease it (braking).
When the car accelerates, the engine does work, and the car's kinetic energy increases. When you apply the brakes, they do work in the opposite direction of motion, and kinetic energy decreases.
You want to set up an experiment in which the forces attract each other. What must your set up look like?
Answer:Use two magnants with opposite poles South and north attract to each other same poles push away. So using two magnants as the forces that will attract each other.
Explanation: I feel like this is how I would go about it but If it is wrong I apologize but I don't know what else they would want. So that said Good luck :) hope this helps.
Use two magnet of opposite poles to set up an experiment in which the forces attract each other. In this set up, the poles of the magnet must be opposite and it can be easily demonstrated as an experiment in which the forces attract each other.
What is magnetic force?The attraction or repulsion of magnetic force results from the motion of electrically charged particles. It is the fundamental force behind phenomena like how electric motors operate and how magnets are drawn to iron.
Among fixed electric charges, there are electric forces; among moving electric charges, there are both electric and magnetic forces. The influence of a magnetic field generated by one charge on another charge can be referred to as the magnetic force between two moving charges.
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How is chemical symbol of the element determined?
Answer:
As per international agreement.
Explanation:
A chemical symbol is a mode to represent a chemical element. These symbols are named as per international agreements.
How would you describe the layers of the earth
gravity has traditionally been defined as a force of attraction between things that have
The gravity has traditionally been defined as a force of attraction between things that have masses.
Explanation:
Gravitational force is a type of attractive force. It is because of this force, that we are able to walk on this Earth. Also due to gravitational force, the solar system and the galaxies are existing in the universe. Sir Issac Newton first discovered this force. He postulated the universal law of gravity. And according to this law, the gravitational force will be acting between the objects having masses and separated by a distance. So in this law, it states that gravitational law is directly proportional to the product of masses and inversely proportional to the square of the distance between them.
Thus, the gravity has traditionally been defined as a force of attraction between things that have masses.
WILL GIVE BRAINIEST! Considered together, kinetic and potential energy on a macroscopic scale are known as what
A mechanical energy
B light energy
C internal energy
D thermal energy
At NASA's Zero Gravity Research Facility in Cleveland, Ohio, experimental payloads fall freely from rest in an evacuated vertical
shaft through a distance of 132 m.
(a) If a particular payload has a mass of 50 kg, what is its potential energy relative to the bottom of the shaft?
(b) How fast will the payload be traveling when it reaches the bottom of the shaft?
m/s
(c) Convert your answer to mph for a comparison to highway speeds.
mph
Answer:
(a). Energy is 64,680 J
(b) velocity is 51.43m/s
(c) velocity in mph is 115.0mph
Explanation:
(a).
The potential energy [tex]P[/tex] of the payload of mass [tex]m[/tex] is at a vertical distance [tex]h[/tex] is
[tex]P =mgh[/tex].
Therefore, for the payload of mass [tex]m = 50kg[/tex] at a vertical distance of [tex]h = 132 m[/tex], the potential energy is
[tex]P = (50kg)(9.8m/s^2)(132m)[/tex]
[tex]\boxed{P = 64,680J}[/tex]
(b).
When the payload reaches the bottom of the shaft, all of its potential energy is converted into its kinetic energy; therefore,
[tex]mgh= \dfrac{1}{2}mv^2[/tex]
[tex]v= \sqrt{2gh}[/tex]
[tex]v = \sqrt{2*9.8*135}[/tex]
[tex]\boxed{v = 51.43m/s}[/tex]
(c).
The velocity in mph is
[tex]\dfrac{51.43m}{s} * \dfrac{3600s}{hr} * \dfrac{1mile}{1609.34m}[/tex]
[tex]\boxed{v= 115.0mph}[/tex]
Which quantity refers most directly to the average molecular kinetic energy present in a substance?
thermal energy
temperature
specificheat
heat of fusion
(B) Temperature
Explanation:
Temperature is a measure of the average kinetic energy of the atoms or molecules in the system. The water molecules in a cup of hot coffee have a higher average kinetic energy than the water molecules in a cup of iced tea, which also means they are moving at a higher velocity.The specific heat capacity is how much energy is needed to increase the temperature of one gram of a substance by 1°C or 1K.
what is the ability of water to condense on the surface on a cool glass mainly due to?
Because of its contact with air surface
Explanation:
When the water comes into contact with surface of a cool glass, water surface gets its contact with open surface air.
Due to the contact of water droplets with atmospheric air water particles condense up, which means molecules inside the water droplets comes into close contact where the inter molecular spaces becomes tight than previous.
Hence, Water gets condensed while it is brought into contact with cool glass.
Where a compass points to in Hudson Bay Canada
Answer:
Temagami, James Bay
Explanation:
If an object's mass is decreasing while a constant force is applied to the object, would its acceleration decrease, increase, or remain the same?
Answer:
increase
Explanation:
We need to find what change takes place to the acceleration of the object in the given situation.
The acceleration of the object would increase.
m = Mass of the object
a = Acceleration of the object
Force is given by
[tex]F=ma[/tex]
Acceleration would be
[tex]a=\dfrac{F}{m}[/tex]
It is given that force is constant so
[tex]a\propto \dfrac{1}{m}[/tex]
This means that acceleration is inversely proportional to mass.
Here, the mass is decreasing so the acceleration will increase.
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please helppppp meeeee I am struggling
Answer:
see below
Explanation:
The color you see is the result of that color being reflected (not absorbed) by the object.
The "reflected" answers here are straightforward. You also need to know that the mix of all colors is white.
__
For the "absorbed" answers, you need to look through the list of all colors and see which is NOT absorbed. That color is reflected, so is the color of the object.
When all light is absorbed, the apparent color is "black."
_____
These ideas are also used in other applications.
A "black hole," for example, is a stellar object that conceptually absorbs everything — all forms of energy and matter. (However, it has been recently discovered that black holes actually emit a certain kind of radiation.)
Conceptually, "white noise" is noise that consists of every frequency (all "colors"). In practice, it is restricted to a certain band, just a white light is restricted to the band of visible frequencies in the electromagnetic spectrum.
If an object force of 50 N is used to move an object a distance of 20 m, what distance must the object be moved if the input force is 10 N, so that work in = work out?
To keep work output equal with a reduced force of 10 N, the object must be moved 100 m, based on the work formula showing that work equals force times distance.
Explanation:To determine the distance an object must be moved with a different force while ensuring that the work input equals the work output, we use the work formula Work = Force × Distance. Initially, a 50 N force moves an object 20 m, so the work done is 50 N × 20 m = 1000 Joules. If the force is reduced to 10 N, to maintain the same amount of work (1000 Joules), the object must be moved a greater distance. We solve for the distance using the work formula, rearranging it to Distance = Work / Force. Thus, the new distance is 1000 Joules / 10 N = 100 m.
What term describes gas that is compressed into a smaller space than it would normally occupy at Earth's surface?
pressurized gas
condensed gas
repressed gas
surplus gas
Answer:
Pressurized gas
Explanation:
When we compress the gas, the volume occupied by a gas decreases, since the volume is inversely proportional to the pressure, the compression of the gas causes an increase in Pressure. The molecules not only collide with each other but also on the walls of the container.
Compressed gases can cause fires, explosions, low-oxygen atmospheres, exposure to toxic gases and the physical danger associated with high-pressure cylinders. Special procedures for storage, use, handling and disposal are required to ensure the safety of the researchers who use these chemicals and equipment. There are also risks associated with the gas pressure and the physical weight of the cylinder. A falling gas bottle can break containers and crush your feet. The cylinder can become a missile if the cylinder valve breaks.
Why is a football firm when it is inflated to its proper pressure
Answer:
Proper Inflation and Feel When inflating your ball, you can use either a hand pump or an air pump equipped with a gauge that gives readings in pounds per square inch, also called psi. Footballs used in the NFL are inflated to 13 psi, but a proper range can fall between 12.5 and 13.5 psi, according to Wilson Sporting Goods.
Explanation:
A football is firm when it is inflated to its proper pressure due to the relationship between volume, pressure, and temperature in a gas.
Explanation:A football is firm when it is inflated to its proper pressure due to the relationship between volume, pressure, and temperature in a gas.
When air is pumped into the football, its volume increases initially without much increase in pressure. However, once the air has filled the football to a certain point, the walls of the football resist further expansion, causing an increase in pressure with more air. Additionally, once the football is inflated, its pressure can further increase with temperature.
This is because when the temperature of a gas increases, the average kinetic energy of its particles increases, leading to more frequent and forceful collisions with the walls of the football, which in turn increases the pressure.
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Please need help on this one
Answer:
B) 5
Explanation:
Pedigree charts can be read like family trees, and you can trace a trait through families. Squares usually refer to males, and circles refer to females. Shaded shapes usually refer to the presence of a specific trait, whereas blank shapes are those who do not possess the trait of interest.
The horizontal line between 1 and 2 shows that these individuals have had offspring.
If you follow that vertical line down to the next level, you can see it forms 5 branches - to individuals 3, 5, 7, 8 and 10. Therefore, 1 and 2 had five offspring.
Then, individual 3 had two children with individual 4 (see the horizontal line) - individuals 11 and 12.
Individual 5 had three children with individual 6 - individuals 13, 14, and 15.
Individual 7 did not have any children. Neither did individual 8
Individual 10 had four children with individual 9 - individuals 16, 17, 18 and 19.
Which of the following is not one of the reasons to properly warm up before exercising?
A. Develop overall flexibility.
B. Increase blood flow to the muscles and raise body temperature.
C.Prevent injuries such as strains sprains and muscle cramps.
D. Return heart rate to resting levels.
Answer:
Letter D is not a reason to warm up.
Answer:
d
Explanation:
A sling is being rotated at the rate of 100 rpm
a) What will the length of the sling have to be so that the speed of the object
at the end will be 40 meters per second? (in meters)
b)
If the sling is 1 meter long, how fast will the object at the end be
traveling? (in meters per second)
How many revolutions will the sling make over one hour?
Answer:
a) [tex]r = 3.820\,m[/tex], b) [tex]v\approx 10.472\,\frac{m}{s}[/tex]
Explanation:
a) The needed length is found by the following formula:
[tex]r = \frac{v}{\omega}[/tex]
[tex]r = \frac{40\,\frac{m}{s} }{(100\,rpm)\cdot(\frac{2\cdot \pi}{1\,rev} )\cdot (\frac{1\,min}{60\,s} )}[/tex]
[tex]r \approx 3.820\,m[/tex]
b) The required speed is:
[tex]v = \omega \cdot r[/tex]
[tex]v = (100\,rpm)\cdot (\frac{2\cdot \pi}{1\,rev} )\cdot (\frac{1\,min}{60\,s} )\cdot(1\,m)[/tex]
[tex]v\approx 10.472\,\frac{m}{s}[/tex]
Final answer:
The sling must be 3.82 meters long for the object at the end to travel at 40 meters per second, while an object at the end of a 1-meter long sling will travel at 10.47 meters per second. Over one hour, the sling makes 6000 revolutions.
Explanation:
Calculating the Length of Sling and Speed of an Object
To calculate the length of the sling so that the speed of the object at the end will be 40 meters per second, we use the relationship between linear speed (v), radius (r), and angular speed (ω). The linear speed is given by the equation v = r ω, where ω must be in radians per second. For 100 rpm, we convert to radians per second:
ω = 100 rev/min × (2π rad/rev) × (1 min/60 s) = 10.47 rad/s
The required radius (or length of the sling) is then: r = v/ω = 40 m/s / 10.47 rad/s = 3.82 meters.
To find out how fast the object at the end of a 1 meter long sling would be traveling, we use the same formula: v = r ω = 1 m × 10.47 rad/s = 10.47 m/s.
Over one hour, the number of revolutions would be 100 rpm × 60 min/hour = 6000 revolutions.
When you hit a .27 kg volleyball the contact time is 50 ms and the average force is 125 N. If you serve the volleyball (from rest) sending it up at 30 degrees above the horizontal, what is the
A) vertical component of the momentum of the volleyball in kgm/s?
B) horizontal component of the momentum of the volleyball in kgm/s?
The vertical component of the momentum of the volleyball is -0.49 kgm/s and the horizontal component is 38.93 kgm/s.
Explanation:To find the vertical component of the momentum, we need to first find the vertical velocity of the volleyball. We can use the equation:
vf = vi + at
The initial vertical velocity is 0 m/s since the volleyball was sent up from rest. The final velocity can be found using the equation:
vf = vi + gt
where g is the acceleration due to gravity. Plugging in the values and solving for vf, we get:
vf = 0 + (-9.8 m/s^2)(0.05 s)
vf = -0.49 m/s
Since the downward direction is considered negative, the vertical component of the momentum is -0.49 kgm/s.
To find the horizontal component of the momentum, we can use the equation:
p = mv
where p is the momentum, m is the mass of the volleyball, and v is the horizontal velocity. The horizontal velocity can be found using:
vx = v * cos(theta)
where theta is the angle above the horizontal. Plugging in the values, we get:
vx = 45 m/s * cos(30 degrees)
vx = 38.93 m/s
Therefore, the horizontal component of the momentum is 38.93 kgm/s.
Circuit that has only one path for the current to follow
Answer:
Series circuit
Explanation:
The type of circuit can be divided into series and parallel. In the series circuit, there is only one loop/path. If the path is cut or stopped, the current of the circuit will be stopped completely. A parallel circuit has more than one loops. This means the circuit has alternative paths that it can travel in case that one path is blocked or cut. This alternative path makes the parallel circuit have a lower resistance compared to the series.
If an object has a mass of 26 g on earth, would its mass be less than 26g on the moon?
Answer:
No
Explanation:
An objects mass is not affected by gravity. No matter where an object is, it will have the same mass. How much it weighs will change, because gravity will change.
Answer:
No, the mass of the given object will be same on the Earth as well as on the Moon.
Explanation:
The term "mass" is estimation of a given object or a system of objects. It is a totally independent quantity. Thus, its magnitude will not vary while carrying it from one place to another.
Which of the following is true about the gibbous moon? A. All of its lit surface can be seen. B. More than half of its lit surface can be seen. C. Less than half of its lit surface can be seen. D. None of its lit surface can be seen.
The fact which is true about the gibbous moon is more than half of its lit surface can be seen.
Option B
Explanation:
There are nearly 12 phases the moon undergoes between one new moon to another new moon condition. All these phases has different names based on their shape or structure visible in the sky during this period.
The gibbous phase of the moon comes in the 4th and 6th phase after the new moon. The gibbous moon which comes in the 4th phase is termed as waxing gibbous as from this time, the size of the moon lit will be increasing till full moon, after this phase.
Then in the 6th phase, the gibbous moon is termed as warning gibbous moon as from this time, the size tends to decrease after this. But in both the conditions, when the moon is in gibbous moon phase, more than half of its lit surface will be seen in the sky.
Answer:
More than half of its lit surface can be seen.
Explanation:
As potential and kinetic energy increase what happens to mechanical energy?
A. Mechanical energy increases
B. Mechanical energy decreases
C. Mechanical energy stays the same
D. Mechanical energy has no relation to kinetic and potential energy
Answer:
a
Explanation:
what is the resistance of a conductor
Opposition for the current flow
Explanation:
Resistance is defined as the ability pf the conductor to oppose the flow of electrons through it. It is usually represented in Ohm.Resistance is an important parameter in a circuit design and it should be properly designed.Resistance of a conductor depends upon the material nature, length of the conductor and area of cross section. In conductor, Resistance is low. It is due to that charges flow through the conductor freely.8) When an F-14 airplane takes off an aircraft carrier it is literally catapulted of the flight deck.
The plane's final speed at take-off is 68.2 m/s. The F-14 starts from rest. The plane accelerates
in 2 seconds and has a mass of 29 545 kg. What is the total force that gets the F-14 in the air? 9)A sports car accelerates from 0 to 27 m/s, 60 mph, in 6.3 seconds. The car exerts a force of
4106 N. What is the mass of the car?
10)A boy can accelerate at 1.00 m/s? over a short distance. If the boy were to take an energy
pill and suddenly have the ability to accelerate at 5.6 m/s“, then how would his new energy-pill-
force compare to his earlier force? If the boy's earlier force was 45 N, what is the size of his
energy-pill-force?
12) A cartoon plane with four engines can accelerate at 8.9 m/s- when one engine is running.
What is the acceleration of the plane if all four engines are running and each produces the same
force?
The total force required to launch an F-14 from an aircraft carrier is calculated using Newton's second law (F = m * a). The mass of a sports car exerting a known force can also be found using the same principle. Changes in force based on different levels of acceleration and the cumulative effect of multiple engines on acceleration are understood using the proportionality of force to acceleration.
Explanation:To calculate the total force that gets the F-14 in the air from an aircraft carrier, one can use Newton's second law, which states that force equals mass times acceleration (F = m * a). First, we find the acceleration using the formula a = (v - u) / t, where 'v' is the final velocity, 'u' is the initial velocity (which is 0 m/s in this case), and 't' is the time. Substituting the given values, a = (68.2 m/s - 0 m/s) / 2 s, which gives an acceleration of 34.1 m/s². The mass of the plane is 29,545 kg, so the force can be found by multiplying the mass by the acceleration: F = 29,545 kg * 34.1 m/s², which results in a total force of 1,006,284.5 N.
For the sports car question, we are given the force exerted by the car and asked to find the mass. Since force equals mass times acceleration, the mass is equal to force divided by acceleration. The acceleration (a) can be calculated by using the formula a = (v - u) / t. With v being 27 m/s, u being 0 m/s, and t being 6.3 seconds, the mass (m) is calculated as m = F / a. After computing 'a', you can use the provided force (F) to find 'm'.
If the boy's acceleration changes due to the energy pill, the force can be recalculated using Newton's second law, keeping in mind that Force is proportional to acceleration for a constant mass. If the original force was 45 N for an acceleration of 1.00 m/s², and the new acceleration is 5.6 m/s² with the same mass, the new force will be proportional to this increase. The new force would be found by multiplying the old force by the ratio of the new acceleration to the old acceleration, giving us the new force = old force * (new acceleration / old acceleration).
To determine the acceleration of the cartoon plane with all four engines running, you would simply multiply the acceleration with one engine by the number of engines if each engine provides the same force. Therefore, if the acceleration with one engine is 8.9 m/s², with all four engines it would be 4 times that, resulting in an acceleration of 35.6 m/s².