Levers often have a greater mechanical advantage than inclined planes because they can amplify force more efficiently over shorter distances. Inclined planes reduce the force needed by increasing the distance, but the work done remains the same; friction can additionally reduce the inclined plane's efficiency.
When comparing the mechanical advantage (MA) of simple machines such as the lever and the inclined plane, the reason that the lever often has a greater efficiency than the inclined plane has to do with the amount of work done and the distance over which the force is applied.
An inclined plane increases the distance over which the force must be applied to move an object to the same height, thus reducing the input force needed. However, because that distance is increased, the force must be applied over a longer path, which may result in similar amounts of work being done as lifting the object straight up. The MA of an inclined plane can be calculated using the formula MA=1/sin θ.
The lever, on the other hand, operates based on the distances from the fulcrum to the points of application of the effort and load forces. The ratio of these distances determines the MA. With levers, it is possible to gain a significant MA even over a short distance, allowing more efficient force amplification, usually without the same extent of motion required by an inclined plane.
Furthermore, when comparing the two machines, friction may play a minor role. As the inclined plane involves a greater travel distance, the opportunity for friction to affect the work done is increased, potentially reducing the system's efficiency compared to a lever where the interaction points may be more limited and thus less susceptible to energy loss due to friction.
The image shows a pendulum that is released from rest at point A. Shari tells her friend that no energy transformation occurs as the pendulum swings between point B and point D.
What is the best response that Shari’s friend could make?
She could agree with Shari because the pendulum is at the same height and would have the same gravitational potential energy at both positions.
She could agree with Shari because the pendulum has the same amount of mechanical energy throughout its swing.
She could disagree with Shari because the pendulum converts kinetic energy into gravitational potential energy, then back into kinetic energy.
She could disagree with Shari because the pendulum converts gravitational potential energy into kinetic energy, then back into gravitational potential energy.
Answer:
She could disagree with Shari because the pendulum converts gravitational potential energy into kinetic energy, then back into gravitational potential energy.
Explanation:
The energy of the pendulum is constantly converted from gravitational potential to kinetic, and back.
In fact:
- the gravitational potential energy of the pendulum is given by:
[tex]U=mgh[/tex]
where m is the mass of the pendulum, g is the gravitational acceleration, and h is the height of the pendulum above the ground
- The kinetic energy of the pendulum is given by:
[tex]K=\frac{1}{2}mv^2[/tex]
where v is the speed of the pendulum.
Therefore, when it is at a higher position, the pendulum has a greater potential energy, while when it is at a lower position, the pendulum has a greater kinetic energy (because its speed is higher).
In this example:
- when the pendulum swings from B to C, part of its gravitational potential energy is converted into kinetic energy (because the height decreases but the speed increases), and when the pendulum goes from C to D, the kinetic energy is converted back into gravitational potential energy (because the height increases and the speed decreases)
Which of the following statements describes electric fields?
Electric potentials are caused by electric fields.
Electric fields are scalar values.
Electric charges produce electric fields.
Electric fields cannot exist in space.
The correct answer is
Electric charges produce electric fields.
In fact, electric fields are produced by electric charges. For instance, the electric field produced by a single-point charge is radial, and its intensity decreases as the inverse of the square of the distance from the charge, according to:
[tex] E=k\frac{q}{r^2} [/tex]
where k is the Coulomb's constant, q is the magnitude of the charge and r is the distance from the charge. If the charge is positive, the electric field points away from the charge; if the charge is negative, the electric field points toward the charge.
How does newton's first law of motion relate to galileo's concept of inertia?
Read the sentence. telescopes or satellites _____ that neither mercury nor venus _____ a moon. which pair of verb forms correctly completes the sentence? proves; has proves; have prove; have prove; has
When there is or in-between two words, the tense is dependent upon the word that comes after or. In other words, the word that is closest to the verb will decide the form of the verb.
Since satellites is a plural form of a satellite, the verb that follows satellites should also be plural. The plural verb in the given options is prove.
As far as the second blank is concerned, you can see Venus is a proper noun; therefore, the verb that comes after Venus should be a singular verb, which in this case is has.
So the complete sentence would become the following:
Telescopes and satellites prove that neither Mercury nor Venus has a moon.
Correct pair: prove:has
What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity?
Answer:
Comet's orbit.
Explanation:
Edmond Halley and Alexis Clairaut were one of those Newtonian who helped to validate the results of Isaac Newton.
They correctly explained Comet' motion and how planets gravitational force affect them.
But using Newton's idea of Mathematics and Gravity, they have made two important discoveries:
1. Why celestial bodies have different colors.
2. They were able to find the Comet's orbit and prediction(year) of its return.
Suppose you put in 100 j of work on a lever and get out 93 j of work. what is the efficiency of the lever and how much of the work input is lost as heat in joules?
The efficiency of the lever is 93%, calculated by comparing the output work to the input work. 7 joules of the input work are lost as heat.
The efficiency of the lever is determined by comparing the output work to the input work. In this case, the efficiency can be calculated using the formula:
Efficiency = (Output Work / Input Work) X 100%
Substituting the given values:
Efficiency = (93 J / 100 J) X 100%
Efficiency = 93%
The amount of work lost as heat is the difference between the input work and the output work, which can be calculated as:
Heat lost = Input Work - Output Work
Heat lost = 100 J - 93 J
Heat lost = 7 J
Therefore, 7 joules of the work input are lost as heat.
HELP PLEAASE!!!You push against a steamer trunk with a force of 750 N at an angle of 25° with the horizontal . The trunk is on a flat floor and the coefficient of static friction between the trunk and floor is 0.77. What is the most massive trunk you will be able to move? 80 kg 90 kg 67 kg
The most massive trunk you will be able to move is approximately [tex]\( 69.2 \, \text{kg} \)[/tex]. So, the closest option is 67 kg.
To find the maximum mass of the trunk you can move, we need to consider the maximum force of static friction that can be exerted by the floor on the trunk. The maximum force of static friction[tex](\( F_{\text{friction}} \))[/tex] can be calculated using the formula:
[tex]\[ F_{\text{friction}} = \mu_s \times N \][/tex]
Where:
-[tex]\( \mu_s \)[/tex] is the coefficient of static friction,
- [tex]\( N \)[/tex] is the normal force exerted by the floor on the trunk.
The normal force[tex](\( N \))[/tex] can be calculated as the vertical component of the force you exert on the trunk:
[tex]\[ N = F_{\text{vertical}} = F \times \cos(\theta) \][/tex]
Where:
- F is the force you exert on the trunk (750 N in this case),
- [tex]\( \theta \)\\[/tex] is the angle of the force with the horizontal (25° in this case).
Substituting the given values:
[tex]\[ N = 750 \, \text{N} \times \cos(25^\circ) \]\[ N \approx 750 \, \text{N} \times 0.906 \]\[ N \approx 679.5 \, \text{N} \][/tex]
Now, we can calculate the maximum mass m of the trunk using the formula:
[tex]\[ F_{\text{friction}} = m \times g \][/tex]
Where:
- m is the mass of the trunk,
- g is the acceleration due to gravity (approximately [tex]\( 9.81 \, \text{m/s}^2 \)).[/tex]
Substituting the given values:
[tex]\[ 679.5 \, \text{N} = m \times 9.81 \, \text{m/s}^2 \]\[ m = \frac{679.5 \, \text{N}}{9.81 \, \text{m/s}^2} \]\[ m \approx 69.2 \, \text{kg} \][/tex]
Therefore, the most massive trunk you will be able to move is approximately [tex]\( 69.2 \, \text{kg} \)[/tex]. So, the closest option is 67 kg.
What dies the viscosity of a liquid measure? the relationship between density and speed of flow how rapidly its volume changes with increasing temperature the ration of silica to iron content within a magma the resistance of a liquid to flow?
The picture is a model of a nitrogen atom. What is incorrect about the atomic orbital arrangement of electrons in this model and how should they be arranged?
Roberto and his sister had a garden in the backyard. Every spring they grew strawberries, like the plant you see here. Plants make their own food through the process of photosynthesis. What non-living parts of this backyard ecosystem are needed for the plant to survive? A) oxygen, water, and sunlight B) water, oxygen, and sunlight C) water, carbon dioxide, sunlight D) carbon dioxide, oxygen, sunlight
Which of the following statements is true?
A. Like charges attract and unlike charges repel each other.
B. Gravitational forces only exist between large masses.
C. On a level surface, normal force is greater than the weight of the object.
D. Applied forces are those created by another object or person.
Answer:
C.
Explanation:
I did this assignment
Your weight depends on
A. your mass
B. your distance to the center of the Earth
C. the earth's mass
D. A, B, and C
E. none
Explain how fusion and fission are similar to and different from each other. Thanks.
A substance has a specific heat of 0.870 J/g°C. It requires 2,000.0 joules to increase the temperature of 10.0 grams of the substance from its original temperature to its final temperature.
By how many degrees did the substance increase?
87.0°C
174°C
230°C
1,740°C
Answer: [tex]230^0C[/tex]
Explanation:
[tex]Q=m\times c\times \Delta T[/tex]
q = heat absorbed or released by a substance = 2000.0 J
m= Mass of substance = 10.0 g
c = specific heat of the substance = [tex]0.870 J/g^0C[/tex]
[tex]\Delta T=T_f-T_i[/tex] = Change in temperature
Putting in the values we get:
[tex]2000.0J=10.0g\times 0.870J/g^0C\times \Delta T[/tex]
[tex]\Delta T=230^0C[/tex]
Thus the temperature changed by [tex]230^0C[/tex].
Answer:Answer is C. 230 degrees celsius.
Explanation:Edge 2023
I need the answers to this please
An unfortunate 18 kg monkey falls from a 40 m tall tree. What is the monkeys final velocity just befor he impacts the ground.? a 7063.2 m/s b 784 m/s c 28 m/s d 720 m/s
Two or more velocities add by ____?
Plz help
In physics, two or more velocities are usually added by using vector addition, adding together their horizontal and vertical components. For example, if one object moves east at 3 m/s and another north at 4 m/s, you would add these using a graph and the Pythagorean theorem.
Explanation:In physics, two or more velocities are typically added by methods of vector addition. To add velocities, you first decide on a common reference frame. Then, you perform vector addition, which includes adding the x-components (horizontal velocities) together to get the total x-component, and adding the y-components (vertical velocities) together to get the total y-component.
For instance, if one object is moving at a velocity of 3 m/s to the east, and another object is moving at a velocity of 4 m/s to the north, you would add these velocities together by drawing them as arrows on a graph, and then using the Pythagorean theorem to find their resultant velocity. This is known as adding velocities, and it's crucial in understanding the concepts of motion and direction in physics.
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What conclusions can be drawn about the existence of nitrogen-14 and nitrogen-15? A) They are isotopes of nitrogen and they contain the same number of protons and electrons but each contains a different number of neutrons - 7 and 8 respectively. B) They are the same form of nitrogen and they include the same number of electrons and neutrons but each contains a different number of protons - 7 and 8 respectively. C) They are several allotropes of nitrogen and they accommodate the same number of neutrons but each contains a different numbers of protons and electrons - 7 and 8 respectively. D) They are different configurations of nitrogen and they consist of the same number of protons and neutrons but each contains a different number of electrons - 7 and 8 respectively. Eliminate
What is the approximate percentage change in the Earth-Sun distance between June 21 and December 21?
Which sentence most likely explains why the rock has large open pores
Answer:I got it right on quiz
Explanation:
The relationship between frequency, wavelength, and speed holds for light waves because
A.light travels slower in a vacuum than in air
B.all forms of electromagnetic radiation travel at a single speed in a vacuum
C.light travels in straight lines
D. Different forms of electromagnetic radiation travel at different speeds
The relationship between frequency, wavelength, and speed holds for light because each type of electromagnetic wave travels at the same speed (the speed of light) in a vacuum. This leads to a constant relationship between these parameters for all light waves, described by the equation: speed of light = frequency X wavelength.
Explanation:The relationship between frequency, wavelength, and speed holds for light waves because all forms of electromagnetic radiation travel at a single speed in a vacuum. This speed is known as the speed of light, typically represented by the symbol c and is approximately 299,792 kilometers per second. These properties of light waves are commonly captured in the formula c = λν, where c is the speed of light, λ (lambda) is the wavelength, and ν (nu) is the frequency. This means that the frequency of a light wave times its wavelength always equals the speed of light. Therefore, the relationship between frequency, wavelength, and speed holds for light because these factors are intrinsically linked, irrespective of the type of electromagnetic wave.
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An air bag applies a force of 6100 N to bring about a change in momentum of 3540 kg m/s. How much time did it act over
A. 0.26 s
B. 6.1 s
C. 0.58 s
D. 35 s
E. 1.7 s
A longitudinal wave lacks which of the following properties? a. speed. b. frequency. c. wavelength. d. amplitude. e. A longitudinal wave has all of the above.
The correct option is (e). A longitudinal wave has all of the properties like speed, frequency, wavelength & amplitude.
Longitudinal waves are characterized by their unique properties, which include speed (a), frequency (b), wavelength (c), and amplitude (d). Here's a brief explanation of each property:
a. Speed (a): This is the rate at which the wave propagates through a medium. It is typically measured in meters per second (m/s) and depends on the properties of the medium, such as its density and elasticity.
b. Frequency (b): This is the number of complete cycles of the wave that pass a given point per unit time. It is measured in hertz (Hz) and is related to the pitch or tone of a sound wave, which is a type of longitudinal wave.
c. Wavelength (c): This is the distance between two consecutive points in the wave that are in phase, such as two adjacent peaks or two adjacent troughs. It is usually denoted by the Greek letter lambda [tex]\lambda[/tex] and is related to the frequency and speed of the wave by the equation [tex]\( v = f \lambda \)[/tex], where v is the speed, f is the frequency, and [tex]\( \lambda \)[/tex] is the wavelength.
d. Amplitude (d): This is the maximum displacement of a point on the wave from its rest position. It determines the loudness or intensity of a sound wave and is related to the energy carried by the wave.
List these drinks in order of kinetic energy, starting with the drink whose particles have the highest kinetic energy.
hot chocolate, water, juice, milk
hot chocolate juice, milk, water
water milk, juice, hot chocolate
water, hot chocolate, juice, milk
Answer: Option (b) is the correct answer.
Explanation:
The energy obtained by an object because of their motion is known as kinetic energy.
Hence, when particles of an object is moving rapidly from one place to another then it means the molecules have high kinetic energy.
Therefore, in a hot chocolate molecules will have high kinetic energy due to increase in temperature. Whereas particles of juice has more kinetic energy than milk. On the other hand, molecules of water will have least kinetic energy as only then it is existing in liquid state otherwise it would have evaporated.
Thus, we can conclude that drinks in order of decreasing kinetic energy are as follows.
hot chocolate > juice > milk > water
Michaela is baking a dessert. She measures 100 mL of vegetable oil by pouring it from the bottle into a measuring cup. Then she pours the vegetable oil into a bowl with the other ingredients. Which best describes what happened to the vegetable oil during this process? The volume of the vegetable oil changed, but the shape did not. The shape of the vegetable oil changed but the volume did not. Both the volume and the shape of the vegetable oil changed. Both the volume and the shape of the vegetable oil remained the same.
Option B: The shape of the vegetable oil changed but the volume did not.
To answer this question, we need to understand the states of matter.
It is pertinent to know that the state of matter will only change when it gains or loses energy.
In this case, the vegetable oil is just transferred from a bottle into a cup and then into a bowl. In all this, no energy was gained nor lost, the only thing that will change will be the new shape of the oil because of the bowl in which it currently resides which is different in shape than the bottle.
Thus, we can conclude that the shape of the vegetable oil changed, but the volume didn't change
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The presence of which phenomenon proved the predictability of the big bang theory?
What is the wavelength (in air) of a 13.0 khz vlf radio wave?
Final answer:
The wavelength of a 13.0 kHz VLF radio wave in air is calculated using the formula λ = v / f, with the speed of light as the speed. This yields a wavelength of about 23,077 meters, or 23 kilometers, illustrating the long-distance propagation capabilities of VLF radio waves.
Explanation:
The question pertains to calculating the wavelength of a 13.0 kHz VLF (Very Low Frequency) radio wave in air. The formula that links the wavelength (λ), frequency (f), and speed (v) of a wave is λ = v / f. For electromagnetic waves in air, the speed can be approximated to the speed of light, which is roughly 3×108 meters per second (m/s).
Using this formula:λ = 3×108 m/s / 13,000 Hz = approximately 23,077 meters.
Therefore, the wavelength of a 13.0 kHz VLF radio wave in air is about 23 kilometers. This large wavelength is characteristic of VLF radio waves, allowing them to propagate over long distances and curve around the Earth's surface, making them useful for communication over the horizon without the need for satellite or cable transmission.
Which of the following stars is likely to appear the brightest?
The star with the least energy
The most massive star
The farthest star
The coldest star
The most massive star is likely to appear the brightest. Hence option B is correct.
What is Most massive star ?The sun may be the most massive object in the solar system, making up 99.8% of the system's total mass, yet compared to other stars, it is actually rather typical. Of all known stars, roughly half are more massive and half are less massive. R136a1, a star that is more than 300 times as massive as the sun, is the most massive star known to exist in the sky. Yet it's not the only star dwarfing the main star of the Earth.
The Tarantula Nebula contains RMC 136a1, more often known as R136a1, which is located around 163,000 light-years from Earth. The Great Magellanic Cloud, one of the Milky Way's satellite galaxies, contains this huge star, which is located outside of our galaxy.
In 1960, astronomers at the Radcliffe Observatory in South Africa discovered the RMC 136 star cluster. More than 200 incredibly brilliant stars were discovered in the cluster when the Hubble Space Telescope analysed the system; the most massive of these stars was known as RMC 136a1.
Hence option B is correct.
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Which statement best describes the electrons in this illustration ?
A) The electrons are negatively charged particles located outside the nucleus
B) The electrons are positively charged particles located inside the nucleus
C) The electrons are negatively charged particles located inside the nucleus
D) The electrons are positively charged particles located outside the nucleus
Please help according to the photo I attached.
The correct answer will be rewarded! Thanks.
The statement which best describes the electron in the given illustration is the electrons are negatively charged particles located outside the nucleus.
What is electron?Electron is the the elementary particle of atom. The electron is negatively charged element of a atom, with the magnitude equal to the [tex]1.6\times10^{-19}[/tex] C. This charge of electron is equal and opposite of the charge of proton.
The neutron (neural partial of atom) and the proton(positively charged particle of atom) is located inside the nuclease.
Unlike the neutron and proton, the electron located outside of the nucleus as shown in the image given in the problem.
Lets check all the option-
A) The electrons are negatively charged particles located outside the nucleus- As the electron are negatively charged particle and unlike the neutron and proton, the electron located outside of the nucleus. Thus, this is the correct option.B) The electrons are positively charged particles located inside the nucleus- As the electron are negatively charged. Thus, this is an incorrect option.C) The electrons are negatively charged particles located inside the nucleus- Unlike the neutron and proton, the electron located outside of the nucleus. Thus, this is an incorrect option.D) The electrons are positively charged particles located outside the nucleus-As the electron are negatively charged. Thus, this is an incorrect option.Thus, the statement which best describes the electron in the given illustration is the electrons are negatively charged particles located outside the nucleus. Therefore, the option A is the correct option.
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It's not physics it's physical science but I figured this was the closest subject to it. 1. The life cycle of a star begins with a cloud of gas and dust called a (1 point)