A(n)

2 answers:

6 0

A theory is an explanation that unites the findings of many experiments, and it can be changed when new experimental results need to be explained.

Galina-37 [17]3 years ago

6 0

Answer:

A scientific theory is an explanation that unites the findings of many experiments, and it can be changed when new experimental results need to be explained.

Explanation:

A scientific theory is a set of concepts, including abstractions of observable phenomena and quantifiable properties, together with rules (scientific laws) that express the relationships between observations of such concepts. A scientific theory is constructed to fit the available empirical data on such observations, and is proposed as a principle or set of principles to explain a class of phenomena.

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An elevator weighs 1500 Newtons. Calculate how much potential energy it has when it is lived 500 meters in the air.

avanturin [10]

An elevator has 750,000 J when it is lived 500 meters in the air

Answer: Option D

<u>Explanation:</u>

The expression to find the potential energy completely on the basis of forces that on two objects. It can be written as

$potential\ energy (P . E)=m \times acceleration\ due\ to\ gravity\ (g) \times height (h)$

Where,

m – mass of object

Acceleration due to gravity = $9.8 \mathrm{m} / \mathrm{s}^{2}$

h = 500 meters

Force = 1500 Newton

As we know, according to Newton second law of motion, the force can be expressed in terms of mass and gravity (F= ma). So, the potential energy can be calculated as

$P . E=F \times h=1500(500)=750000 J$