What are some examples of convection in our daily lives
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Related Questions
A force gives a 5.0 kg object an acceleration of 2.0 m/s 2. The same force would give a 20 kg object an acceleration of _____. 0.5 m/s 2 2.0 m/s 2 4.9 m/s 2 8.0 m/s 2
2 PointsWhich of the following statements are not true about gravity? Check all thatapply.A. Gravity exists only on Earth.OB. Gravity exists between two objects that have mass.OC. Gravity is a force that pulls two objects together.D. Gravity exists in the whole universe.E. Gravity doesn't exist between Earth and the sun.
What is the normal acceleration of a car?
Why bucket of water is filled faster in downstairs tap than in the upstairs tap
B.) the universe may continue to expand
C.) stars could burn out , causing the universe to become dark and cold
D.) gravity could pull galaxies back together causing a reverse of the Big Bang
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Answer:
B.) the universe may continue to expand
Explanation:
The steady state theory which states that the universe was, is and will be the same, has been discredited by two physicists who found the leftover energy from the big bang.
If you are listening to FM radio, you might have heard some static noise while changing stations, that noise is from the leftover energy from the big bang. This energy is called the dark energy.
The dark energy tries to rip everything apart while gravity tries to hold everything together.
It was observed that the dark energy is stronger than gravity.
The distance between the galaxies is increasing. This proves that the dark energy successfully defeated the gravity and expanted two massive objects in the universe.
Because of this dark energy the universe will continue to expand.
Note: Dark energy is also increasing the distance between protons in atomic nucleus in every atom in our body too. Chilly right?
the answer is B! it would continue to expand.....just took the test XD
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Ah hah ! I work with these things all the time, so I can read it straight
off the picture. However, I realize that you probably don't, and can't ...
otherwise you wouldn't need to look for help online. So I'll try to
explain through it:
-- This is a "topographic map", and those brown lines on it are
"elevation contours".
-- All of the points on one brown line are all at the same elevation
(altitude, height, etc.), so if you follow one of the brown lines wherever
it goes, you're following a level path.
-- The little numbers somewhere on each brown line tell you the elevation
(above something) of all the points on that line. You can see lines that
are 35-ft, 45-ft, 50-ft etc. above whatever the reference is for this map.
If a line has no numbers on it, then it's halfway between the next lower
line and the next higher line. There's a line on this map with no number
on it between 35 and 45 ... the elevation of every point on this line is 40.
There's another one between 45 and 50 with no number on it ... every
point on that line must be at elevation of 47.5 .
-- On this kind of map ...
==> The flattest ground is where the lines are far apart, like where
that lake is. That's where there's a big distance between the 25-ft
line on one side, to the 30-ft line on the other side. All of the land
between those 2 lines is within 5 feet of the same height.
Same for the land between the 30-ft line and the 35-ft line ... every
point between those 2 lines is within 5 feet of the same height. It's
a very level place.
The gentlest 'shallowest' slope is always on the path that crosses the
fewest lines, or where the lines you have to cross are the farthest apart.
That's how we'll find the answer to the question, in just a moment.
==> The steepest slope is where the lines are close together, like
from 35-ft to 45-ft to 50-ft. In that short distance, the land rises 15-ft
because it's going up the steep side of Mount Cleveland.
==> You can also see where the peaks are, like where the 52-ft line
makes a circle. The peak of the mountain is inside that circle, and from
there, no matter which way you walk from the peak, the land goes down.
-- The absolutely shallowest path to the peak of the mountain would start
on the left side of the map, about 1/3 of the way up from the bottom.
There seems to be 2 lines there, but if you follow them up and around,
you find that they're both the same 50-ft line. So from that point on the
edge, all the way to the peak of the mountain, the land only rises a
little more than 2 feet. But you'd still have to get yourself up to that
starting point, and this path is not one of the choices.
-- If you start at the bottom center just below the end of the lake, OR
if you start from the lower right in Arthur Park, OR if you start at the
upper right in the marsh and swamp up at that end of lake, heading
for the peak of the mountain from any one of those points, you start
from elevation lower than 30 feet, and your hike is flat and pretty level
for a while, until it gets to the 35-ft line. And then, suddenly, it goes
ZUP ... 17 feet straight up to the top, in a short distance from there,
and crossing lines that are close together.
-- If you start from the bottom left corner, that point is already at an
elevation of about 45-ft, so it only has about 7-ft more to rise from there
to the peak. ALSO ... Starting from there, and going all the way to the
peak, the path goes roughly the same way the brown lines go ... it's
roughly parallel to them ... so there's more distance from one line to
the next one.
So "bottom left" is the place to start.
Note:
The numbers on the lines of a real topographic map are much more
likely to be marked in meters, not feet, so everything I've just described
would be 3.28 times as hard to climb.
B. Aquifier
C. desertification
D. aquaculture
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d. aquaculture
B) none, because the lens is too close to the object
C) a virtual image
D) an inverted real image
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Answer:
C
Explanation:
An object that is less than a focal length from a convex lens forms a virtual, magnified image. When the object is closer to a convex lens than the focal point, its rays do not pass through the focal point to form an image on the opposite side of the lens.
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The carpet is more likely to accumulate excess electric charge (static electricity) over time when there is no good way for it discharge. The dry air, as was said, insulates the carpet and makes it prone to such accumulation. This is less the case with humid air that allows the carpet to continuously discharge a portion of its electric charge over time and thus spares us--the walkers--a minor shock.
Final answer:
Dry air is a better electrical conductor than humid air, which is why you are more likely to receive a shock after walking across a carpet when the air is dry compared to when the air is humid.
Explanation:
The reason you are more likely to receive a shock after walking across a carpet when the air is dry than when the air is humid is because dry air is a better electrical conductor than humid air. When the air is dry, it has a lower field strength, meaning that it takes a smaller voltage to create a spark. On the other hand, humid air breaks down at a lower field strength, so it takes a larger voltage to create a spark. This is why you are more likely to get a shock on a dry day.
Learn more about Electrical Conduction here:
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B.This is true because weight is the amount of matter in an object. Because gravity is a force, and force is proportional to weight, both gravity and weight vary in different places in the universe.
C. This is true because gravitational force is the magnitude of weight acting on an object and since weight varies in different places in the universe, gravitational force also varies.
D. This is true because weight is the magnitude of gravitational force acting on an object, and since gravitational force varies in different places in the universe, weight also varies.
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Explanation :
We know that the weight of an object is given by :
Where,
m is the mass
g is the acceleration due to gravity.
The value of g changes from one location to another.
An object's weight is dependent upon its location in the universe. This statement is true. This is because g varies in different places so the weight also varies.
Hence, the correct option is (D) " This is true because weight is the magnitude of gravitational force acting on an object, and since gravitational force varies in different places in the universe, weight also varies ".
Because an object's weight is the measure of the gravitational
forces between the object and other things that have mass.
In its travels around the universe, the object can be in the
neighborhood of other things with huge mass or tiny mass,
and it can be nearer to them or farther away from them. So
the gravitational forces between the object and other things
can have widely different values in different places.
Read the choices very carefully.
I think 'D' is the one that says this.