Answer:
D. john checks all the reviews of an app and reads the permissions before granting access to an app.
Explanation:
Just got it correct in Plato, 100% positive.
The correct answer is D. John takes proper security measures while using mobile apps. John checks all the reviews of an app and reads the permissions before granting access.
Explanation:The correct answer is D. John takes proper security measures while using mobile apps. John checks all the reviews of an app and reads the permissions before granting access to an app.
Checking app reviews is important because it can provide insights into the app's reliability, security, and user experience. By reading the permissions before granting access, John ensures that the app does not request unnecessary access to personal information or device features.
Appropriate security measures help protect user privacy and prevent potential risks such as data breaches or malicious activities.
A circular loop of radius r is rotated through a magnetic field B, which of the following would increase the magnetic flux through the loop by a factor of 16?
Doubling B and quadrupling r.
Quadrupling B and doubling r.
B remains constant and quadrupling r.
Doubling B and doubling r.
Answer: B
Explanation: I think
The correct option that would increase the magnetic flux through the loop by a factor of 16 is quadrupling B and doubling r.
The correct option that would lead to an increase in the magnetic flux through the loop by a factor of 16 corresponds to statement: Quadrupling B and doubling r.
To understand this, let's break it down:
Doubling B and quadrupling r: 2 × 4 = 8
Quadrupling B and doubling r: 4 × 2 = 8
B remains constant and quadrupling r: 1 × 4 = 4
Doubling B and doubling r: 2 × 2 = 4
Thus, only quadrupling B and doubling r would lead to an increase in the magnetic flux through the loop by a factor of 16.
This type of a boundry can be located
at around 40 N latitude and 0 long titude
the fences around individual shops or homes in eastern Spain
The student's question is about a boundary around 40° N latitude and 0° longitude, which lies in the midlatitudes region. The exact nature of the boundary is unclear, but it could relate to geographic or climatic divisions. Additional context is needed for a precise answer.
The student is asking about a type of boundary that can be located around 40° N latitude and 0° longitude. This location is commonly associated with the midlatitudes, which are the regions of Earth that are neither part of the tropics nor the polar regions. The boundary mentioned in the context of latitude around this area could be referring to the division between the Earth's climatic cells, such as the boundary between the Ferrel cell and the polar cell, which typically occurs around the 60° latitude. However, since the question specifies around 40° N latitude, which is within the middle latitudes, it's not clear which specific type of boundary the student is inquiring about without additional context.
In the absence of additional context, it's also worth noting that the Equator, Arctic Circle, and Antarctic Circle are important parallels but do not intersect 40° N latitude. The prime meridian is the only line of longitude with a value of 0° and intersects the Earth at different latitudes, including 40° N.
As one goes from left to right in a period, which of the following is true?
A. The number of protons decreases.
B. The number of valence electrons increases.
C. both A and B
D. none of the above
Answer:
The correct answer is C , because it increases and decreases
Explanation:
As one goes from left to right in a period on the periodic table, the number of protons increases while the number of valence electrons remains the same or slightly increases.
Explanation:As one goes from left to right in a period on the periodic table, the number of protons increases while the number of valence electrons remains the same or slightly increases.
This pattern is observed because the number of electrons in the energy levels fills up as you move across the period, and the number of protons in the nucleus also increases. The increase in protons leads to a greater positive charge in the nucleus, which attracts more electrons, resulting in a tendency for the number of valence electrons to increase or remain the same.
Therefore, the correct answer is option D: none of the above, as neither the number of protons nor the number of valence electrons decreases consistently as one goes from left to right in a period.
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The closer the particles are together, the ______ sound is able to move.
Answer:
Faster
Explanation:
The closer the particles are together, the faster sound is able to move.
Sound travels the slowest through the air because gas particles are more spread apart than liquids or solids.
Sound will travel the fastest through solids because the particles in solids are densely packed together.
Final answer:
Sound travels faster in mediums where particles are closer together due to increased density. Solids, being more dense, allow for quicker sound transmission compared to liquids and gases. Temperature and movement of the medium also play a role in the speed of sound.
Explanation:
The closer the particles are together, the faster sound is able to move. This principle is due to the increased density of the medium, which allows sound waves to be transmitted more efficiently between particles. Sound travels faster in solids than in liquids, and faster in liquids than in gases because the particles in solids are much closer together, making solid mediums the most dense.
Furthermore, temperature affects the speed of sound; warmer mediums increase particle movement leading to faster sound transmission. Additionally, the speed of sound is influenced by the medium's movement, such as the impact of wind helping or hindering the travel of sound waves depending on the direction of the sound relative to the wind.
A car has a force of 2000N and a mass of
1000kg. What is the acceleration of the
car?
Answer:
2 m/s
Explanation:
The acceleration of the car is 2 m/s².
What is acceleration?
Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).
Given parameters:
Force acting on the car; F = 2000N.
Mass of the car; M = 1000 kg.
From Newton's second law of motion, we know that:
Force = mass× acceleration.
⇒ acceleration = Force/mass = 2000/1000 m/s² = 2 m/s².
Hence, the acceleration of the car is 2 m/s².
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a. If 0.45 kg of iron at 140°C is added to 1.5 kg of water at 22°C, what will be the final temperature of the system? (4 points)
Answer:
25.67 °C
Explanation:
From the question,
Heat lost by iron = heat gained by water
c'm'(t₁-t₃) = cm(t₃-t₂)................ Equation 1
Where c' = specific heat capacity of iron, m' = mass of iron, c = specific heat capacity of water, m = mass of water, t₁ = initial temperature of iron, t₂ = initial temperature of water, t₃ = temperature of the system.
make t₃ the subject of the equation
t₃ = (c'm't₁+cmt₂)/(c'm'+cm).............. Equation 2
Given: m' = 0.45 kg, t₁ = 140 °C, t₂ = 22 °C, m = 1.5 kg
Constant: c' = 450 J/kg.K, c = 4200 J/kg.K
Substitute these values into equation 2
t₃ = (0.45×450×140+1.5×4200×22)/(450×0.45+4200×1.5)
t₃ = (28350+138600)/((202.5+6300)
t₃ = 166950/6502.5
t₃ = 25.67 °C
[OU.03] What is the best method to increase the accuracy of the parallax measurement of star distances?
Answer: Trigonometric or Stellar Parallax
Explanation:
Whenever a star is too far away to measure its parallax, astronomers do match its color and spectrum to one of the standard candles and determine its intrinsic brightness.
Comparing this to its apparent brightness, they can get a good measure of its distance by applying the 1/r^2 rule.
Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. They measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.
The sound from a loud speaker has an intensity level of 80 db at a distance of 2.0m. Consider the speaker to be a point source, how far from the speaker will the sound have an intensity level of 40 db.
Answer:
2.83m
Explanation:
The information that we have is
Intensity at 2.0 m: [tex]I=80dB[/tex] and [tex]r_{1}=2m[/tex]
we need an intensity level of: [tex]I_{2}=40dB[/tex]
thus, we are looking for the distance [tex]r_{2}[/tex].
which we can find with the law for intensity and distance:
[tex](\frac{r_{2}}{r_{1}} )^2=\frac{I_{1}}{I_{2}}[/tex]
we solve for [tex]r_{2}[/tex]:
[tex]\frac{r_{2}}{r_{1}}=\sqrt{\frac{I_{1}}{I_{2}} }\\\\r_{2}=r_{1}\sqrt{\frac{I_{1}}{I_{2}} }[/tex]
and we substitute the known values:
[tex]r_{2}=(2m)\sqrt{\frac{80dB}{40dB} }\\\\r_{2}=(2m)\sqrt{2}\\ r_{2}=2.83m[/tex]
at a distance of 2.83m the intensity level is 40dB
Make a claim as to whether analog signals or digital signals are more reliable to transmit information. Use evidence and reasoning to support you claim
ok this is the answer
Atoms are happy (they will not readily react with other elements) when they have a full outside ring of
electrons.
O True
O False
Answer: TRUE
Explanation:
Atoms are happy when they will not react with other elements while having a full outside ring of electrons because this makes them to be noble.
A stable atom possesses full outside ring of electrons while unstable one does not. So, they are happy also because of stability.
3. A wave in a 12m rope is shown in a diagram in one second
l<--------------- 12m
a) What is the wavelength of this wave
b) If the frequency of the wave is 2 Hz, what is the wave speed?
The wavelength of the wave in the 12m rope could be 12 meters if the wave spans the entire length of the rope. The wave speed is calculated to be 24 m/s when frequency is 2 Hz and assuming the wavelength is 12m. Similar methods apply for other wave speed calculations.
Explanation:To answer the student's questions:
a) The wavelength of a wave in a 12 m rope is not given explicitly in the question. However, if it is implied that the wave spans the entire length of the rope, then the wavelength would be 12 meters.b) The wave speed can be calculated using the formula: wave speed = frequency × wavelength. Given that the frequency of the wave is 2 Hz, and assuming the wavelength is the length of the rope (12 m), the wave speed would be 2 Hz × 12 m = 24 m/s.For another example, question 38 stated: "Scouts at a camp shake the rope bridge they have just crossed and observe the wave crests to be 8.00 m apart. If they shake the bridge twice per second, what is the propagation speed of the waves?" The propagation speed would be the frequency (2.00 Hz) multiplied by the wavelength (8.00 m), giving 16.00 m/s.
explain how a maglev train provides evidence that magnetic fields can apply forces between objects that do not touch.
Answer:
Powerful electromagnets are fitted on top of guideways either ttract or repel the magents fitted on the bottom of train. The froce of attraction/repulsion rasies the train in hovering position.
Explanation:
Magentic fields exist between two opposite/like poles. The poles do not have to be touching each other. They can be separated by a distance in a medium that doesn' block magnetic field.
In magelv train the magnetic forces between two poles are used to operate the train. The two poles are separated by train body and air.
A wave has an amplitude of 0.0800 m and is moving .33 m/s . One oscillator in the wave takes 0.115 s to go from the lowest point in its motion to the highest point. Find the period of the wave.
Answer:
0.230 s
Explanation:
The period is the length of time from one peak to the next. If it takes the oscillator 0.115 s to go from the lowest point to the highest point, then it takes another 0.115 s to return to the lowest point. So the period is 0.115 + 0.115 = 0.230 seconds.
The period of the wave, based on the student's observation of a half-cycle taking 0.115 seconds, is calculated to be 0.230 seconds by doubling this time for a full cycle.
Finding the Period of a Wave
The student has observed that one oscillator in a wave takes 0.115 seconds to go from the lowest point to the highest point in its motion. This is half the time of a full oscillation, as it must go from the lowest point to the highest point, and back down again to complete one cycle. Therefore, to find the period of the wave, we must double that amount of time. Thus, the period (T) of the wave is:
T = 2 x 0.115 s = 0.230 s
Explain how Lee’s surrender at Appomattox affected the South’s Civil War effort.
Explanation:
Lee's surrender did not end the Civil War, but it was the beginning of the end. The surrender of other Confederate armies began shortly after: The Army of Tennessee surrendered on April 26, 1865. Confederate armies in Alabama, Mississippi, and eastern Louisiana all surrendered on May 4, 1865.
The driver of a car slams on the brakes, causing the car to slow down at a rate of
26ft/s2 as the car skids 256ft to a stop.
How long does the car take to stop?
What was the car's initial speed?
ft/s 4
Answer:
A. The time taken for the car to stop is 3.14 secs
B. The initial velocity is 81.64 ft/s
Explanation:
Data obtained from the question include:
Acceleration (a) = 26ft/s2
Distance (s) = 256ft
Final velocity (V) = 0
Time (t) =?
Initial velocity (U) =?
A. Determination of the time taken for the car to stop.
Let us obtain an express for time (t)
Acceleration (a) = Velocity (V)/time(t)
a = V/t
Velocity (V) = distance (s) /time (t)
V = s/t
a = s/t^2
Cross multiply
a x t^2 = s
Divide both side by a
t^2 = s/a
Take the square root of both side
t = √(s/a)
Now we can obtain the time as follow
Acceleration (a) = 26ft/s2
Distance (s) = 256ft
Time (t) =..?
t = √(s/a)
t = √(256/26)
t = 3.14 secs
Therefore, the time taken for the car to stop is 3.14 secs
B. Determination of the initial speed of the car.
V = U + at
Final velocity (V) = 0
Deceleration (a) = –26ft/s2
Time (t) = 3.14 sec
Initial velocity (U) =.?
0 = U – 26x3.14
0 = U – 81.64
Collect like terms
U = 81.64 ft/s
Therefore, the initial velocity is 81.64 ft/s
Final answer:
To find the stopping time and initial speed of the car, kinematic equations for constant acceleration are used. The initial speed is calculated using the equation for the final velocity at rest, and the time is then determined by the equation relating velocity, initial speed, and acceleration. The car takes 3 seconds to stop completely.
The car travels 39.0 ft in this time.
The car's initial velocity was 52 ft/s.
Explanation:
To determine how long the car takes to stop and the car's initial speed, we can use the kinematic equations of motion for constant acceleration. Given that the deceleration is 26ft/s2 and the skid to a stop is 256 feet, we use the equation v2 = u2 + 2as, where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance traveled. Because the car comes to a stop, the final velocity v is 0.
The equation simplifies to u2 = -2as. Substituting the given values, we get u2 = -2(−26)(256), so the initial speed u = √(2 × 26 × 256).
Once we find u, we can use the equation v = u + at to find the time t the car takes to stop. Rearranging for t, we have t = (v - u)/a. We substitute v = 0 and the calculated initial speed for u to get t.
Very easy physics maths about current and other stuffs only one question please help me
Three identical resistors of resistance 3 ohms are connected in series in a circuit. What is the total voltage of the battery if the current in the circuit is 2A ?
Answer:
Total voltage of the battery is 12 volts.
Explanation:
It is given that, we have three identical resistors of resistance 3 ohms are connected in series in a circuit. It is required to find the total voltage of the battery if the current in the circuit is 2 A.
Let [tex]R'[/tex] is the equivalent resistance in series combination. The equivalent resistance is given by :
[tex]R'=R_1+R_2\\\\R'=3+3\\\\R'=6\ \Omega[/tex]
Let V is the total voltage of the battery. Ohm's law is given by :
[tex]V=IR\\\\V=2\times 6\\\\V=12\ V[/tex]
So, the total voltage of the battery is 12 volts.
A beam of yellow monochromatic light passes from quartz (n = 1544) into
water (n = 1333). In the water, the beam makes an angle of 35.0° with the
normal. When the beam is traveling in the quartz, what angle does it for with
the normal? (A) 25.1 (B).29.8 (C)38.9 (D) 20.6
Answer:
CANT SOO SORRY
Explanation:
Answer:
The answer is 29.8 (b)
Explanation:
I just took a quiz with this question on there and this was the answer.
A longitudinal wave is observed to be moving along a slinky. Adjacent crests are 2.4 m apart. Exactly 6 crests are observed to move past a given point in 9.1 s. Determine the wavelength, frequency, and speed of this wave.
Answer:
The wavelength is 2.4 m (the distance between crests). The frequency is 0.66
Hz (6 crests/sec / 9.1 s). The speed of the wave is 0.66 * 2.4m = 1.58 m/s.
Explanation:
The wavelength, frequency and speed of the given wave is required.
The wavelength of the wave is 2.4 m
The frequency of the wave is 0.659 Hz.
The speed of the wave is 1.582 m/s.
The distance between adjacent crest is 2.4 m.
This is the wavelength of the wave.
[tex]6\ \text{crest}=9.1\ \text{s}[/tex]
[tex]1\ \text{s}=\dfrac{6}{9.1}=0.659\ \text{Hz}[/tex]
The velocity of the wave is the product of wavelength and frequency
[tex]2.4\times \dfrac{6}{9.1}=1.582\ \text{m/s}[/tex]
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What is a tiny sheet of silicon containing an entire circuit with many different components? A. a binary circuit B. a coded circuit C. an integrated circuit D. a stationary circuit
The correct answer is C an integrated circuit.
Integrated circuits are tiny silicon sheets containing many components vital for modern electronics. They revolutionized technology by enabling miniaturization and high functionality in devices.
The correct answer is C. an integrated circuit. An integrated circuit is a tiny sheet of silicon that contains an entire circuit, including many different components such as transistors and diodes. These circuits are etched onto the silicon surface and are essential components in modern electronic devices, as they can hold billions of nanoscale components needed for various functions.
Integrated circuits revolutionized the way electronic devices are made, allowing for significant miniaturization and complexity in devices like computers and cell phones. The invention of the integrated circuit enabled the modern computer revolution by allowing vast amounts of electronic circuitry to fit into small chips, instead of requiring large rooms for the same technology.
The direction of the magnetic field produced by an electric current will change when the direction of the ______ changes.
Answer:
Current
Explanation:
Your welcome
Answer:
Current
Explanation:
(WILL MARK BRAINLIEST and 21pts) Which layer of the sun contains jets of rapidly moving gas called spicules?
a. Core
b. Corona
c. Photosphere
d. Chromosphere
Answer:
You may be able to avoid these annoyances in the chromosphere — the reddish middle layer of the sun that links the star's surface to its outer atmosphere, or corona — but that neighborhood is not without its hazards, either. This vast layer is marked by a constantly moving forest of plasma spears known as spicules.
Explanation:
Answer:
D. Chromosphere
Explanation:
The chromosphere contains spikes of gas called spicules. Spicules are short-lived phenomena, corresponding to rising jets of gas that move upward at about 30km/sec and last only about 10 minutes.
1. What type of rocket is not associated with Werner von Braun? A. V - 1 B. V - 2 C. Saturn 5 D. Delta II
Answer:
Saturn V
Explanation:
I'm 100 percent sure of this
It's the Delta II ... the newest one on the list.
The first launch in the Delta program was in 1987 ... 10 years after von Braun's death.
Match the term with the appropriate image.
(a) The object position is represented by the first image.
(b) The focal length of the mirror is represented by the last image.
(c) The image position is represented by the second image.
Object position in the mirror
The position of the object in the mirror is represented by an upward arrow. The object is this question is the upward arrow towards left hand side.
Image formed by the mirrorThe image formed by the mirror in this question is inverted and it is represented by an downward arrow towards the left.
What is focal length?This is the distance between the lens and the focal point. The last image in the diagram represents the focal length of the mirror.
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Which statement uses the terms velocity and acceleration correctly?
A. Acceleration is the rate of change of velocity.
B. An object with a constant velocity cannot accelerate.
C. Acceleration is always in a straight line.
D. Acceleration is an increase in velocity.
E. Acceleration happens only in the same direction as the object is moving.
Option A: Acceleration is the rate of change of velocity.
Explanation:The statement that uses the terms velocity and acceleration correctly is option A: Acceleration is the rate of change of velocity. Acceleration is defined as the change in velocity over time, so it represents how quickly the velocity is changing. Option B is incorrect because even though an object with constant velocity has no change in speed, it can still accelerate if it changes its direction. Option C is also incorrect because acceleration can occur in any direction. Option D is incorrect because acceleration can be a decrease in velocity as well. Option E is incorrect because acceleration can happen in any direction.
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It takes 300 N to move a box 10 meters in 10 seconds. How much power is
required?
O A. 100 W
O B. 3,000 J
C. 30,000 W
O D. 300 W
Answer:
I do t really know what's the answer but try it your self not uo but rude
at which velocity would you expect an object to have the greatest amount of kinetic energy? a. 11-20 m/s b.0-10 m/s c. 21-30 m/s d. 31-40 m/s
Answer:
31-40 m/s
Explanation:
The kinetic energy of an object is given by :
[tex]E=\dfrac{1}{2}mv^2[/tex]
m is mass of the object
v is velocity
If mass of an object is constant, its kinetic energy depends only on velocity. It means if the velocity is more, it will have maximum kinetic energy. For the interval of 31-40 m/s, the kinetic energy of the object is maximum.
choose the correct label for each of the identified points in the sketch.
A:
B:
C:
D:
Answer:
A. negativly charged
B. leader
C. return stroke
D. possitively charged
Explanation: hope this helps!!
The label for each of the identified points in the sketch is A the cloud that is negatively charged, B lightening, C leader, and D earth's surface which is positively charged.
What is the principle of lightning?The principle of lightning is based on the buildup of electrical charge in the atmosphere. Lightning is an electrical discharge that occurs when there is a difference in electrical charge between the atmosphere and the ground. This difference in charge is caused by the separation of positive and negative charges within a thunderstorm cloud.
The main parts of a lightning bolt are:
The stepped leader: This is the initial discharge of electricity that moves towards the ground from the cloud. The stepped leader is a series of steps that propagate toward the ground in a zigzag pattern.
The dart leader: This is a single path that moves rapidly towards the ground, and it usually follows the path established by the stepped leader.
The return stroke: This is the main flash of lightning that we see. It is the result of the connection between the downward-moving stepped leader or dart leader and the upward-moving streamers from the ground. This connection completes the electrical circuit and allows the discharge of electricity to occur.
The Thunder: This is the sound that is produced by the sudden expansion of air around the lightning bolt. Thunder is caused by the intense heat of lightning, which can heat the air to temperatures of up to 30,000 Kelvin (53,540 degrees Fahrenheit).
Lightning is a complex and dynamic phenomenon, and there are many different factors that can affect the way it behaves. However, these four parts are the basic components of a lightning bolt and help us understand how it is formed and how it travels from the cloud to the ground.
Therefore, the leaders coming from the cloud are negatively charged, while the streamers on the ground are positively charged. The return stroke, which is the main flash of lightning, consists of positively charged ions moving from the ground to the cloud.
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The Eclipses only occur one more time during the year 2025, and that is on September 7th (Lunar) and September
21" (Solar). If we have a full moon and a new moon every month, why do you think we can't see a lunar and solar
eclipse every month?
Answer:
the moon isn't always at the right angle between the earth and the sun for us to see or for it to have a effect not the best at space but that's what I think the reason is . I wonder what the proper answer is
Explanation:
The placebo effect happens when:
O
A. an individual is affected by the experimental treatment.
O
B. an individual participates in a survey and changes his or her
behavior.
O
C. an individual takes an inert substance, like a sugar pill, and feels
better after taking it.
O
D. an individual interferes in an observational study.
Answer:
C
Explanation:
Refraction occurs when a wave
a enters a new medium at an angle.
b. hits a surface through which it cannot pass.
c. moves around a barrier.
d interferes with another wave.