The ideal mechanical advantage (IMA) of the machine is 3. The developer's claim of an actual mechanical advantage (AMA) of 4 is higher than the calculated IMA, suggesting that some energy is lost to friction. Therefore, the claim is not true.
Explanation:The ideal mechanical advantage (IMA) of a machine is calculated by dividing the input distance by the output distance. In this case, the input distance is 81 meters and the output distance is 27 meters. Therefore, the IMA of the machine is 81/27 = 3.
The developer's claim of an actual mechanical advantage (AMA) of 4 is higher than the calculated IMA of 3. This suggests that some energy is lost to friction in the machine, reducing its efficiency and resulting in a lower AMA. Therefore, based on the calculated IMA, the developer's claim could not be true.
The speed of sound in dry air is approximately 340 m/s to 342 m/s at 0°c. true or false
This answer is false!
Light goes from flint glass into ethanol. the angle of refraction in the ethanol is 25.6 ◦ , the index of refraction for flint glass is 1.61, and the index of refraction for ethanol is 1.36. what is the angle of incidence in the glass? answer in units of ◦ .
The angle of incidence can be solved by using Snell's law of refraction as follows: θ1 = arcsin[(n2*sin(θ2)) / n1], which when calculating, provides the angle of incidence.
Explanation:The problem presented in the question can be solved using Snell's Law of refraction. Snell's law is defined as n1*sin(θ1) = n2*sin(θ2), where n1 and n2 are the indices of refraction, and θ1 and θ2 are the angles of incidence and refraction, respectively.
From the given data in the problem we know that n1 = 1.61 (flint glass), n2 = 1.36 (ethanol), and θ2 = 25.6°. What we want to find is θ1 (angle of incidence in glass).
First, rearrange Snell's law to solve for θ1. θ1 = arcsin[(n2*sin(θ2)) / n1]. By substituting the known values, we find θ1 = arcsin[(1.36 * sin(25.6°)) / 1.61].
By calculating this expression, we would obtain the angle of incidence in the glass in degrees.
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Two men each have a mass of 90 kg. If the gravitational force between them is 8.64 10-8 N, how far apart are they? G = 6.67 × 10-11 N⋅(m/kg)2
Answer:
2.5
Explanation:
-a p e x
What is the magnitude of δv12 if the bulb is removed from the socket (i.e. the circuit is not closed)?
Since the circuit is incomplete or not closed, no current flows in the circuit. as per ohm's law , Voltage is directly proportional to current and is given as
V = Voltage = i R where i = current , R = resistance
as no current flows in the circuit, i = 0
the resistance R can not be zero. hence
V = 0 (R)
V = 0 Volts
so the magnitude of the Voltage is zero Volts
A circuit consisting of a 140 µF capacitor in series with a 2 MΩ resistor is connected across a 6 V battery. What is the time constant of the circuit? Answer in units of s.
Which statement about the speed of light is true?
A. The speed of light is faster for EM waves traveling through a medium.
B. No object or EM wave can move faster than the speed of light in a vacuum.
C. The speed of light changes depending on the motion of the source.
D. Energy, frequency, and wavelength all affect the speed of light.
Final answer:
Option B is correct; the speed of light is a universal constant in a vacuum and is unaltered by the source's motion or the observer. The speed decreases in different media while the frequency remains constant, leading to a change in wavelength.
Explanation:
The correct statement about the speed of light is that no object or electromagnetic (EM) wave can move faster than the speed of light in a vacuum. This is expressed as option B: No object or EM wave can move faster than the speed of light in a vacuum.
It is a fundamental postulate of the theory of relativity that the speed of light in a vacuum is a constant, which is approximately 3.00×108 m/s, and does not depend on the motion of the source or the observer. In fact, the speed of light will slow down when it passes through a medium due to interactions with the material's atoms, which change its permittivity and/or permeability.
The wavelength and speed of light can change as light enters different media; however, the frequency remains constant. This phenomenon can be explained using the relation n = c/v, where 'n' is the index of refraction, 'c' is the speed of light in a vacuum, and 'v' is the speed of light in the medium. Since the frequency (f) is unaltered, and we know that v = λf (where λ is the wavelength), the wavelength must adjust to accommodate the change in speed when light travels through various media.
One object has a charge of +5.0 · 10-6 c, and a second object has a charge of +2.0 · 10-6
c. the objects are 0.5 meters apart. what is the electrostatic force between them?
Final answer:
Using Coulomb's Law, the electrostatic force between two positive charges of +5.0 · 10^-6 C and +2.0 · 10^-6 C, 0.5 meters apart, is calculated to be approximately 0.0719 Newtons, indicating a repulsive force.
Explanation:
To calculate the electrostatic force between two charges, we use Coulomb's Law, which is expressed as F = k * |q1 * q2| / r2, where F is the force between the charges, k is the Coulomb's constant (approximately 8.987 x 109 N m2/C2), q1 and q2 are the magnitudes of the charges, and r is the distance between the centers of the two charges.
For the charges of +5.0 · 10-6 C and +2.0 · 10-6 C separated by 0.5 meters, we substitute these values into the formula to get the electrostatic force. Therefore, F = (8.987 x 109) * (5.0 x 10-6 * 2.0 x 10-6)/(0.5)2.
After calculating, F equals approximately 0.0719 Newtons. This force is repulsive since both charges are positive.
Total mechanical energy is equal to _____.
PE + KE
PE × KE
PE ÷ KE
PE - KE
Answer:
The total mechanical energy is equal to P.E+K.E.
(a) is correct.
Explanation:
Potential energy :
Potential energy is the store energy and It is represents by U.
It is defined as:
[tex]P.E= U =mgh[/tex]
Where, m = mass of the object
g = acceleration due to gravity
h =height
Kinetic energy :
Kinetic energy is defined as the energy of motion. It represents by K.
It is defined as:
[tex]K.E = \dfrac{1}{2}mv^2[/tex]
Where, m = mass of the object
v = velocity of the object
According to law of conservation,
The total mechanical energy is the sum of the potential energy and kinetic energy is constant in time.
[tex]T = P.E+K.E[/tex]
Hence, The total mechanical energy is equal to P.E+K.E.
How does the doppler effect explain differences in sound pitch? choose all that apply?
Doppler effect explains that the approaching sound wave has a shorter apparent wavelength than the sound wave moving away thus the approaching sound wave has a higher pitch than the sound wave moving away.
What is doppler effect?As a wave is approaching towards an observer is amplitude and frequency increases for the observer. Whereas , when it goes away from the observer, thus when it assume longer wavelength the frequency decreases and the intensity of the wave that the observer collects reduces.
The frequency of a sound wave is called pitch. As the wavelength of the wave increases, its pitch decreases. The apparent wavelength of the sound waves near to the observer will be lower.
When the wave moves away its apparent wavelength increases result in the decreased pitch of the sound waves for the observer.
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Which of the following are properties of acids?
Check all that apply.
A. React with certain metals to produce hydrogen gas
B. React with other acids to produce salt and water
C. Taste sour
D. Corrosive
The true statements as regarding the properties of acids are:
React with certain metals to produce hydrogen gas (option A)Taste sour (option C)Corrosive (option D)What are the properties of acids?An acid is a substance which dissolves in water to produced hydronium ion as the only positive ion.
Acid is know for it unique properties which differentiate them from other substances. Such properties includes:
Acids reacts with metals to produce hydrogen gas.Acids have sour taste.Acids are corrosive in natureAcids react with base to form salt and waterAcids have a pH lower than 7Acid turn blue litmus paper redWith the above information about acids, we can conclude that the correct statement as given from the options are:
React with certain metals to produce hydrogen gas (option A)Taste sour (option C)Corrosive (option D)Learn more about properties of acid:
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Suppose the exhaust system on a heat engine is not functioning properly. Which statement best explains how this will affect the engine?
A) The temperature of the gas will not increase during the compression stage.
B) Burned gases will not be released into the surrounding air.
C) The fuel-air mixture will not be able to enter the cylinder.
D) Combustion and subsequent gas expansion will not occur.
If the exhaust system on a heat engine is not functioning properly then burned gases will not be released into the surrounding air. Therefore, option (B) is correct.
What is the exhaust system?An exhaust system can be used to guide reaction exhaust gases away from the controlled combustion in an engine. The entire system delivers burnt gases from the engine and involves one or more exhaust pipes.
An exhaust pipe should be carefully designed to carry toxic gases away from the users of the machine. Generators and furnaces can immediately fill an enclosed space with poisonous exhaust gases such as carbon monoxide, hydrocarbons, and nitrogen oxides.
The gases from most kinds of machines are very hot and the pipe must be heat-resistant. It should not pass near anything that can burn or can be damaged by heat. A chimney also serves as an exhaust pipe in a stationary system.
If the exhaust system is not functioning properly then burned gases will not be emitted into the surrounding air.
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Answer:B)
Explanation:
A wave is traveling through a particular medium. The wave source is then modified so that it now emits waves at a higher frequency. Does the wavelength
A.)increase
B.) decrease
C.) stay the same
D.) depend on other factors
The frequency and wavelength of a wave, traveling through a medium, are inversely related. Therefore if the frequency of the wave increases, the wavelength decreases.
Explanation:When a wave travels through a medium, it does so with a specific speed determined by the medium's properties itself. The frequency and wavelength of a wave are inversely related according to the wave equation speed = frequency x wavelength. Therefore, if the frequency of a wave increases (as per the question), the wavelength would decrease in order to maintain the same wave speed.
To think of it more intuitively, you can consider that a wave hitting a point more frequently (higher frequency) would mean that the waves are 'packed' closer together, which means a smaller wavelength.
So, the correct answer to your question is B.) decrease.
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Which of the following is an example of social facilitation?
A. The football player who practices hard so he can be on the varsity team
B. The Olympic bicycle racer who goes faster when he is racing against a person rather than the clock
C. The bowler who bowls best when he is practicing on his own
D. The tennis player who is frustrated when the crowd yells at her
Option B i.e The Olympic bicycle racer who goes faster when is racing against a person rather than a clock.
As the social facilitation refers to the improvement of performance produced by the presence of others, The Olympic bicycle racer who goes faster when is racing against a person rather than a clock is the best example of social facilitation.
The tennis player who is frustrated when the crowd yells at her is not an example of social facilitation. Though there are presence of people, but their yell at her frustrated her which would worsen her performance.
Answer:
The correct answer is option B, The Olympic bicycle racer who goes faster when he is racing against a person rather than the clock
Explanation:
In social facilitation, a person works/performs better than his/her normal work/performance as he/she is in presence of other people. There are basically two type of social facilitation –
a) co-action effects – when a person works with other person as a co-worker
b) audience effect – when a person works in the mere presence of another person.
In this case , an Olympic racer competes with another racer, thus this would be a co –action effect.
Two beams of coherent light are shining on the same sheet of white paper. when referring to the crests and troughs of such waves, where will darkness appear on the paper?
The middle of the paper will serve as the node and there will be darkness seen at this node.
What is a wave?A wave is a disturbance along a medium which transfers energy. In this case, the two waves will constitute a standing wave.
The middle of the paper will serve as the node and there will be darkness seen at this node.
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Form of communication that reaches large audiences without personal contact.
The form of communication that doesn't require personal contact and capable of getting to a large audience is referred to as mass media.
What is Communication?This is the process in which information is transferred from one person to another.
Mass media which comprises of newspapers, internet etc reach large audiences without personal contact and is the commonest means in these present day.
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What is the source of the radioactive nuclei present in spent fuel rods?
Maggie participated in a race. She ran 100 meters west and then turned back and ran to the starting line to complete the race. Maggie covered this entire distance in 40 seconds. What are her average speed and average velocity?
Answer:
Explanation:
:)
If it takes a cheetah 0.25 seconds to go from 10m/s to 15 m/s what is the cheetahs acceleration
The acceleration of the cheetah going from 10 m/s to 15 m/s in 0.25 seconds is 20 m/s², calculated using the acceleration formula a = Δv / Δt.
You want to know the acceleration of a cheetah that goes from 10 m/s to 15 m/s in 0.25 seconds. To calculate the acceleration, you can use the formula:
a = Δv / Δt
Where a represents acceleration, Δv is the change in velocity, and Δt is the change in time. In this case:
Δv = 15 m/s - 10 m/s = 5 m/s
Δt = 0.25 s
Now, plug these values into the formula:
a = 5 m/s / 0.25 s
a = 20 m/s²
So, the cheetah's acceleration is 20 m/s². This is a straightforward example of calculating linear acceleration.
In which of the following forms of energy might you find specially placed tiles on the floor?
Answer:
Passive solar
Explanation:
Compared with the peak wavelength given off by the Sun, what ls the peak wavelongth given off by a hotter star?
Element Z has a half-life of 20 minutes. In an events chain concept map tracing the nuclear decay of a 200g sample of element Z, would any of element Z remain after 160 minutes? If so, how much?
Given a half-life of 20 minutes for element Z, a 200g sample would undergo eight cycles of reduction by half over 160 minutes, leaving 0.78g of element Z remaining. The element doesn't disappear but transforms into 'daughter elements'.
Explanation:The concept being discussed here is known as the half-life, which is the time it takes for half the atoms in a sample to decay. In this case, element Z has a half-life of 20 minutes. Given that the half-life is the time it takes for half of a substance to decay, we would use this information to determine the remaining quantity of element Z after 160 minutes.
A 200g sample of Element Z would undergo eight half-life cycles in 160 minutes (20 minutes per cycle). Following the pattern of half-life decay, after each cycle the remaining amount would be 100g, 50g, 25g, 12.5g, 6.25g, 3.125g, 1.56g, and finally 0.78g. So, after 160 minutes, there would be 0.78g of element Z remaining.
Please note that the substance doesn't completely disappear but transforms into decay products or, using the metaphor, 'daughter elements' while element Z is the 'parent' element.
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hey im studying and need help....
What is a charestic of an electromagnetic wave?
The electron has the positron as its antiparticle
a. True
b. False
True
electron has negative charge on it. the antiparticle has the same amount of charge on it but of opposite polarity. hence the antiparticle must have positive charge on it. positron has positive charge on it having same magnitude as that on the electron. hence the above statement is true.
Which type of mirror is used to focus light rays?
Tara's cell phone plan costs $39.00 a month, which includes 100 text messages. After she uses all of her text messages, it will cost her $.15 per text message
If continental crust were thinner than its average thickness of 40 km, would it depress the mantle more or less than it does now? Explain.
If the continental crust were thinner, it would depress the mantle less because of the reduced mass above the mantle, leading to less displacement below.
If the continental crust were thinner than its average thickness of 40 km, it would depress the mantle less than it does now. This is because the Earth's crust and mantle are in a state of isostatic equilibrium, which is similar to floating objects on a fluid, where less material above results in less displacement below. The continental crust is thicker and less dense compared to the oceanic crust, which allows it to float higher above the mantle. When the crust is loaded with additional weight, such as through mountain building or glaciation, it depresses further into the mantle due to the added mass. Conversely, if the continental crust were thinner, there would be less mass pushing down on the mantle, leading to a reduced depression of the crust into the mantle.
What is the frequency of a microwave that has a wavelength of 5 cm?what is the frequency of a microwave that has a wavelength of 5 cm?
Frequency of a microwave is 6 × 10⁹ Hz
Given that;
Wavelength of microwave = 5 cm = 0.05 m
Find:
Frequency of a microwave
Computation:
Velocity of microwave = 3 × 10⁸ m/s
Velocity = Frequency × Wavelength
3 × 10⁸ = Frequency of a microwave × 0.05
Frequency of a microwave = 6 × 10⁹ Hz
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This is junior year english
When you put a ice cube in a warm drink and the ice cube thermal energy decreases and the drink thermal energy increases, how does the energy move? What is the situation when the ice cube would give off the heat?