Answer:
175 miles
Explanation:
because when the girl walked from point A to B which is 150 miles and walks away 25 miles to a shop.
a sound intensity of 70 dB is observed a distance of d from the source of sound. what sound intensity would be observed at a distance 2d from the source
Answer:
Correct option is
B
16dB
Sound level at A is ⊥o⊥B
If the intensity of sound at A 4 cm away from the source is I
A
then.
⊥o=10log
I
o
I
A
Where I
o
=10
−12
w m
−2
⇒⊥=log
10
−12
I
A
⇒
10
−12
I
A
=10
⇒I
A
=10
−11
wm
−2
If the source (s) is emmitting the sound energy of power P
I
A
=
4×(4)
2
P
⇒P=10
−11
×64π w
⇒ Intensity of sound (I
B
) ar point B,2 m
I
B
=
4π(2)
2
P
I
B
=
16π
64π×10
−11
10 m
−2
⇒I
B
=4×10
−11
wm
−2
⇒ Sound level at 2m=10log(
I
I
B )
=10log(10 −12
4×10 −11)
=10log40
=16.02
Hence Sound level at 2m from sourceis 16 dB
Explain a lever and a pivot in a full sentence
Answer:
The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot. As the lever rotates around the fulcrum, points farther from this pivot move faster than points closer to the pivot.
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Lilly drove her car east for a total of 6 hours at a constant velocity. In one-third of that time, she drove 160 kilometers. What was her velocity?
Write your answer as a whole number.
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Answer: 160 km
Explanation:
in the accompanying,circuit a battery with an emf of 24 v is connected in series to resistor x and two identical light bulbs connected in parallel.each light bulb is Marked 6 V and 3 w .will the ammeter reading increase or decrease if another identical light bulb is connected in parallel to the existing two and another resistor is connected in series with x? explain your answers
Answer:
Explanation:
When you put another light bulb in parallel with the other two, you are not going to get something for nothing. The current drain on the battery has to go up.
Let the lightbulbs have a a resistance of r. Two light bulbs with make the resistance go to 1/2 r. The lower the resistance, the more the current. When you put the third light bulb in, the resistance will go to 1/3 r. So the current goes up.
If you put another resistor in series with x, the resistance adds. The total series resistance is 2x. The current reading will go down. The higher the resistance the lower the current.
A car has steady speed of 8m/s .How long does the car take to travel 160m
Answer:
the time taken by the car to travel 160 m = 160/8= 20 s
Hope it helps!!!!!!
Thank you
What is concentration gradient?
Answer:
The difference in the concentration of a substance between two areas is called the concentration gradient . The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse. The direction of diffusion is said to be 'down' or 'with' the concentration gradient.
Explanation:
explain why the rest of the group has metallic behavior but boron does not
Answer:
Since boron only has two electron shells, it is about as capable of gaining electrons as it is of losing electrons, so it behaves as a metalloid
Explanation:
Since boron only has two electron shells, it is about as capable of gaining electrons as it is of losing electrons, so it behaves as a metalloid. The other elements in this group have more electron shells, so it is much easier for them to lose their valence electrons and they behave like metals
between the continental shelf and a continental rise?
volcanic island
seamount
continental slope
Answer:
continental slope
Explanation:
the continental shelf is after the land and before the continental rise as it's in the diagram of an ocean floor
NEED HELP ASAP What are the lengths of the x and y components of this vector?
Explanation:
the lengths of the x and y components of the vector :
the x- Component:
Vx = 12×cos72° = 12× 0.3090 = 3.708
the y-component:
Vy = 12×sin72° = 12× 0.9510 = 11.412
-
x-component
= 12 . cos 72
= 12 . 0,3090
= 3,708
y component
= 12 . sin 75
= 12 . 0,9510
= 11,412
#mathisfun
Difference between Work against gravity and Work done against friction?
Answer:
if there is not motion produced in body, the works become zero. We can do work against gravity or against friction. when we lift something then it is work done against gravity and when we slide something then it is work done against friction.
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SCIENCE
A student wants to try to convince her parents to stop serving peas for dinner. She lays out her argument that peas are high in fructose, which is a type of sugar. Which test could she use to provide scientific evidence to support her argument that peas are high in fructose?(1 point)
brown paper bag test
vinegar test
Benedict’s test
iodine test
Answer:Benedict’s Test
Explanation:
The student will use Benedict's test to support her argument.
The common reagents for testing carbohydrates are iodine and Benedicts test.
While iodine gives a positive result with starch, it doesn't react with fructose.
Benedict's reagent is used to determine the presence of reducing sugar in a given solution.
A positive test with Benedict's reagent is determined by a color change from clear blue to brick-red with a precipitate.
A reaction between fructose and Benedict's solution gives a positive test from the color change which occurs when the fructose is reduced to simple sugar such as glucose and mannose.
Thus, the student will use Benedict's test to support her argument.
Learn more here:https://brainly.com/question/13397926
On earth, the acceleration due to gravity is (A. 32 ft/sec2
B. 60 miles/hour).
how many elements have been discovered so far?
Answer:
The answer is...
118.
118 elements have been discovered.
Hopefully, this helps you!!
[tex]AnimeVines[/tex]
Answer:
If you mean chemical elements... there are 118 elements discovered so far.
How are the oscillating magnetic and electric fields of an electromagnetic wave positioned relative to each other?
A) They are parallel to each other.
B) The magnetic field is rotated 45° from the electric field
C) the electric field is rotated 45° from the magnetic field.
D) They are perpendicular to each other
Answer:
D.
for the scalar product between two vectors to be 0 either one of thm is zero vector or they are perpendicular to each other
Give reason for the following:
a) An inflated balloon was pressed against a wall after it has been rubbed with a
piece of synthetic cloth. It was found that the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground.
c) Mountaineers suffer nose bleeding at higher altitudes.
d) Foundations of high rise buildings are kept wide.
e) Deep sea divers or high altitude fliers wear special suits.
f) Walls of a dam are thickened near the base.
a) An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. This is because a positive and negative electric charge is produced, therefore the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground because of gravitational attraction force of earth.
c) Mountaineers suffer nose bleeding at higher altitudes because the oxygen level decreases with increase in altitude, which the body cannot adjust.
d) Foundations of high rise buildings are kept wide because more is the area of contact, less is the pressure efforts. So, foundations are wide so as to decrease the possibility of the building from falling down.
e) Deep sea divers or high altitude fliers wear special suits so as prevent their body from being crushed by the water pressure. Since water pressure is maximum at deep seas and oceans, therefore, more is the risk of being injured.
f) Walls of a dam are thickened near the base so that the dam can handle the kinetic energy pressure and prevent itself from breaking down, which if not, can lead to flooding.
HOPE IT HELPS...
A car accelerates by 4 m/s^2 and travels for 2.5 mins with an initial velocity of 20m/s. Find the final velocity.
Answer:
540m/s
Explanation:
v= u + at
u change t to seconds
the power of a bulb is 100 watt .what does it mean
Answer:
Explanation: 100 watts is a unit of power.
A watt is also the amount of energy being consumed. So the more watts the brighter the light bulb is lit.
Is energy conserved during a fission/fusion reaction?
Answer:
No,but it can be changed into other forms.
wat is the difference between resultance and equilibrum
Explanation:
A resultant force is the sum of the forces on an object.
Forces are said to be in equilibrium when the resultant force is zero. This means the object will not accelerate.
plsss helpp will give brainliest! thanks! :)
Answer:
1. Limiting Factors.
2. Cardiovascular Fitness.
3. Muscular Fitness.
4. Obese.
5. Flexibility.
6. Physical Fitness.
7. Regular Exercise.
Explanation:
There isn't really an explanation for this but please give brainliest if this helped you!
Answer:
I agree with him even though I don't understand anything
maize is called monocot why?
Answer:
Rice, wheat, maize all have one cotyledon in their seed, so they are monocots. Explanation: The monocot plants have a single cotyledon. They have a fibrous root system, leaves in monocots have parallel venation.
Explanation:
Ice has a density of 0.92 g/cm°; gasoline has a density of 0.68 g/cms. Will ice float in gasoline? Why or why
not?
Answer:
No,ice will not float
Explanation:
A substance sinks in another if it has a greater density than the other substance. The density of ice is clearly greater here and so ice will sink
need help asap!! thank you in advance, will mark brainliest!!
Answer:
Wanna be my friend?
Explanation:
what is a risky behaviour
Explanation:
Doing homework is risky behaviour broo
a car travels in a constant speed around BCDA. Where is acceleration present
1) BC and CD
2) BC and AC
3) AB and CD
(sorry for the awk looking diagram its supposed to be all connected btw)
Answer:
3) AB and CD
Explanation:
because where velocity is constant acceleration is equal to Zero
seharitat -The distance of a panet from the earth is 2.5 x 10^7 km and the gravitational force between them them is 3.82 x 10^18 N. Mass of the planet and earth are equal, each being 5.98 x 10^24 Kg. Calculate the universal gravitation constant.
We know
[tex]\boxed{\sf F=G\dfrac{Mm}{r^2}}[/tex]
[tex]\\ \sf\longmapsto G=\dfrac{Fr^2}{Mm}[/tex]
[tex]\\ \sf\longmapsto G=\dfrac{3.82\times 10^{18}(2.5\times 10^7)^2}{(5.98\times 10^{24})^2}[/tex](M=m)
[tex]\\ \sf\longmapsto G=\dfrac{3.82\times 10^{18}(6.25\times 10^{14})}{35.7\times 10^{48}}[/tex]
[tex]\\ \sf\longmapsto G=\dfrac{23.87\times 10^{32}}{35.7\times 10^{48}}[/tex]
[tex]\\ \sf\longmapsto G=0.668\times10^{-16}[/tex]
[tex]\\ \sf\longmapsto G=6.68\times 10^{-15}[/tex]
1. What distances can you be certain of on the ruler in Model 1?
Answer:
Zero cm and 10 cm......
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A moose runs through the woods and covers 825 m North in 118 s. What is the average velocity of the moose?
Average Velocity=Total Displacement/Total Time
[tex]\\ \sf\longmapsto Average\: Velocity=\dfrac{825}{118}[/tex]
[tex]\\ \sf\longmapsto Average\:Velocity\approx 8m/s[/tex]
plz hep me tell ans of this only
We have no idea what force the object might exert until it hits something.
In order to accelerate 70 kg at the rate of 20 m/s^2, YOU or some machine has to PUSH it with a force of (F=m•a) 1,400 Newtons. If you stop pushing it, it stops accelerating.
Who has the greater velocity, an astronaut who has just completed an orbit of the Earth or you when you have just traveled from home to school? Explain.
Answer:
the answer is
Explanation:
constant acceleration
because when the object's velocity is changing then the object is accelerating or decelerating
as acceleration describe changing of velocity so the answer is constant acceleration
Acceleration is defined as the rate of change of velocity.
Acceleration = (Change in velocity) / time taken
Acceleration = (Final velocity - initial velocity) / time
As the object velocity changes by the same amount in each second, it means the acceleration is constant.
Hope I can help u