PHYSICS MIDDLE SCHOOL

Without being able to look into the earth , a scientist would not be able to determine if this region has karst topography True or False

Answers

Answer 1

Answer:

Without being able to look into the Earth, a scientist would not be able to determine if this region has karst topography, is a false statement

Explanation:

Karst topography can be observed by looking into the earth’s external surface structures like barren rocky grounds, caves, underground rivers, sinkholes and other karst landscapes.
Karst topography results due to erosion of limestone by the excavation of underground water. When rainwater erodes the soft rocks like limestone it begins to slowly dissolve in water.
Over repeated erosion, only the rocky cliffs remain on the surface. When an underground river emerges from sinkholes in a karst landscape, the rocky remains form caves.
So by studying these external surfaces itself, the scientist can determine if a region has karst topography

Answer 2

Answer:

Answer: False

Explanation: They can see it by karst topography!

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Why do scientists need a standard system of measurement?A.
to allow for consistency with measurement data

B.
in order to use tools marked in customary units

C.
so they can keep measurement data confidential

D.
to record measurements with easier abbreviations

Answers

the answer is so that everyone is measuring the same distance and counting that distance as the same everywhere. one example from real life why it is important to use standard units is the loss of the NASA mars orbiter. some people decided that the units were to be in metric and others thought that the units were in imperial (english) system. so the orbiter was lost.

let's eliminate some choices
A. to allow for consistientcy with measurement data:
not really, just make sure the instruments are accurate.

B. to use tools marked in customary units: this could be true because a custom is something that is accepted in a wide area and if it is standard, then it is customary so b is the answer

C. so they can keep measurement data secret: nope

D. to record with easier abbreviations: not really

the answer is B

None of the given choices is worth much.

The scientific community ... ALL of them ... need a standard system
of measurement so that one scientist can understand the results of
another scientist's work.

Science is not a bunch of recluse hermits each working alone in their
dusty dungeons. Science is a community. Each scientist publishes
a very detailed description of what he tried and what results he got.
If other scientists read it and get ideas of how they could chase
answers to the same questions, they can pick up where the first
scientist left off, build on his work, or go off in slightly different
directions.

None of that can happen unless everyone precisely understands
everyone else's measurements.

A body of mass 20kg is set in motion by two forces 3N and 4N acting at right angles to each other, determine the magnitude of the acceleration

Answers

The required magnitude of the acceleration of the body is 0.25 m/s².

The change of velocity with respect to time concerning the application of some net external force is known as acceleration.

Given data:

The mass of the body is m = 20 kg.

The magnitude of forces at right angles are, 3 N and 4 N.

Now the net external force for the given magnitude of forces is calculated as,

$F_(net) = \sqrt{3^(2)+4^(2)}\n\nF_(net)=5 \;\rm N$

Now applying Newton's Second law of motion to obtain the value of acceleration as,

$F_(net)=m * a$

Solving as,

$5 =20 * a\n\na= 0.25 \;\rm m/s^(2)$

Thus, we can conclude that the required magnitude of the acceleration of the body is 0.25 m/s².

Learn more about the acceleration here:

brainly.com/question/2437624

Answer:0.25 meter per second square

Explanation:

Resultant force =√(4×4+3×3)

Resultant force=√(25)

Resultant force =5 Newton

But acceleration= force÷mass

Acceleration=5÷20

Acceleration=0.25

Suppose a rocket ship in deep space moves with constant acceleration equal to 9.8 m/s2, which gives the illusion of normal gravity during the flight. (a) If it starts from rest, how long will it take to acquire a speed one-tenth that of light, which travels at 3.0 × 108 m/s? (b) How far will it travel in so doing?

Answers

(a).
It starts from rest, and its speed increases by 9.8 m/s every second.
One tenth the speed of light is (1/10) (3 x 10⁸ m/s) = 3 x 10⁷ m/s .
To reach that speed takes (3 x 10⁷ m/s) / (9.8 m/s²) = 3,061,224 seconds .
That's about 35 days and 10 hours.

(b).
Distance traveled = (average speed) x (time of travel)
Average speed = (1/2) of (1/10 the speed of light) = 1.5 x 10⁷ m/s .
Time of travel is the answer to part (a) above.
Distance traveled = (1.5 x 10⁷ m/s) x (3,061,224 sec) = 4.59 x 10¹³ meters
That's 45.9 billion kilometers.
That's 28.5 billion miles.
That's about 6.2 times the farthest distance that Pluto ever gets from the Sun.

A converging lens can produce both real and virtual images depending on the position of the object. Explain when converging lenses can produce virtual images and describe the image produced.A) A virtual image is produced if the object is on the focal point, the image is upright, enlarged and on the same side of the lens as the object.

B) A virtual image is produced if the object is on the focal point, the image is inverted, enlarged and on the opposite side of the lens from the object.

C) A virtual image is produced if the object is between the focal point and the lens, the image will be upright, enlarged and on the same side of the lens
as the object.

D) A virtual image is produced if the object is between the focal point and the
lens, the image will be upright, reduced and on the opposite side of the
lens from the object.

Answers

A virtual image is produced if the object is between the focal point and the lens.

What is a converging lens?

A converging lens is a lens that can produce both real and virtual images depending on the position of the object.

A virtual image is produced if the object is between the focal point and the lens, the image will be upright, enlarged and on the same side of the lens as the object.

Learn more about converging lens:brainly.com/question/14299912

#SPJ2

Answer: C

Explanation:

On a temperature versus time graph, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?always lower

always the same

usually lower

usually higher

Answers

Answer:

The temperature is always same.

Explanation:

The change of state of matter occurs at the constant temperature, because the heat energy given to the matter is used to change the state in this condition.

So, in the beginning and at the end of the change, the temperature remains constant.

The graph between temperature and time is a straight line parallel to time axis as shown.

Answer:

answer is B

Explanation:

What is linear momentum?

Answers

Linear momentum is a vector quantity defined as the product of an object’s mass and it's velocity

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