Question

please tell this answer fast because I need your help​

Answer 1

Answer:

In common usage, the mass of an object is often referred to as its weight, though these are in fact different concepts and quantities. In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity

Answer 2

Answer of Given Questions By chronological order:

• Accuracy reflects how close a measurement is to a known or accepted value, while precision reflects how reproducible measurements are, even if they are far from the accepted value. Measurements that are both precise and accurate are repeatable and very close to true values.

• In common usage, the mass of an object is often referred to as its weight, though these are in fact different concepts and quantities. In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.

• Parallax method (Having determined D, we can employ a similar method to determine the size or angular diameter of the planet. ... It is the angle between the two directions when two diametrically opposite points of the planet are viewed through the telescope.