True or false : Scientific theories have withstood the test of time and are accepted as proven fact.

Answers

Answer 1

Answer: False they are theories they haven't been proven

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If you push on a wall with a force of 200n with what force does the wall push back

Answers

According to Newtons law, every action has an equal and opposite reaction. So if a student is pushing a wall with a force of 200n, then the wall is pushing the student with 200n

Which of the following is explained by general relativity? A. How massive stellar objects can form a lens. B. Why moving muons decay more slowly than stationary ones
C. Why atomic clocks tick more slowly when in motion
D. Why no object can move faster than light through space-time

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The correct answer is both c and d. In general relativity, it explains why atomic clocks tick more slowly when in motion and why no object can move faster than light through space-time. The theory of relativity was formulated by Albert Einstein.

Which instrument is used to measure the length of an object?

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Answer:

Ruler. The first tool that can be used to measure length is a ruler. A ruler can be made of metal, wood or plastic. A ruler has linear measurement markings.

Explanation:

The power expended when a 10 N barbell is raised 2. 0 m in 2s is

Answers

Work done = (force) x (distance)
   = (10 N) x (2 m) = 20 joules .

Power = (work done) / (time to do the work)
   =       (20 J) / (2 sec)
   = 10 joules/sec = 10 watts .

A 2.0 m tall object is 12.0 m from a convex lens that has a 4.0m focal length. Determine the image size and distance from the
lens.?

Answers

Great question! To determine the image size and distance from the lens, we can use the lens formula:

1/f = 1/v - 1/u

where f is the focal length of the lens, v is the image distance, and u is the object distance.

Given that the focal length (f) is 4.0 m and the object distance (u) is 12.0 m, we can substitute these values into the formula:

1/4 = 1/v - 1/12

To solve for v, we need to rearrange the equation:

1/v = 1/4 + 1/12

1/v = (3 + 1)/12

1/v = 4/12

1/v = 1/3

Now, we can find the value of v by taking the reciprocal of both sides:

v = 3 meters

So, the image distance (v) is 3 meters.

To find the image size, we can use the magnification formula:

magnification (m) = -v/u

Given that the object height (h) is 2.0 meters, we can substitute these values into the formula:

m = -v/u = -3/12 = -1/4

The negative sign indicates that the image is inverted. The magnification value of -1/4 means that the image is one-fourth the size of the object.

Therefore, the image size is 1/4 of the object's height, which is 1/4 * 2.0 = 0.5 meters.

So, the image size is 0.5 meters and the image distance is 3 meters from the convex lens.

I hope this explanation helps! Let me know if you have any further questions.

The effectiveness of an optical lens is attributed to:diffraction
reflection
refraction
interference

Answers

Answer: Refraction.

Explanation: The lenses are used to "transmit" the light that hits the lens in a certain way.

The phenomena in which the light penetrates a medium (where the medium, in this case, is the lens) is called diffraction.

Reflection would be more related to mirrors, difraction is the change of the velocity of the light waves when they are in different mediums, and interference refers to the interaction between two coherent waves (it can be destructive interference, where the waves cancel each other, or constructive interference, where the waves add to each other)

refraction is the right answer

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Describe the manufacturing industry industry in the united states.

A train traveling 80.0 kph is blowing its horn as it approaches a railroad crossing. The horn has a frequency of 300.0 Hz. Assume the speed of sound is 331.5 m/s. What is the observed frequency of the horn?395 Hz281 Hz322 Hz

Which of the following is a chemical property of a mineral?A HardnessB LusterC Atomic structureD Color