Measurements and Errors
What is the International unit system?
It is the most used physics and science unit system in the world.
What are the states of matter?
Solid, liquid and aeriform.
What's the most inner part of the earth called?
Core.
How many planets are in the solar system?
There are eight planets.
What is the astronomical unit?
The distance between the earth and the sun.
What is scientific notation?
Scientific Notation is a common way to express numbers that are too big or too small.
How do solid particles move?
They vibrate.
What is earth's shape?
It is a good.
What types of planets are in the solar system?
Terrestrian and jovian.
How do stars emitt energy?
By thermonuclear reaction.
What is f- in multiples and submultiples?
femto (10^-15)
What happens if a solid becomes aeriform without going trough liquid state?
The phenomnon is called sublimation.
Who calculated the earth's circumference in the third century b.C.?
Eratostene
What does Keplero's first law say?
Planets' orbits are ellittical and the sun is in one of the two focuses.
What is a supernova?
A huge explosion that happens when a star dies.
What is responsiveness (prontezza)?
It tells how fast the measuring tool gives the result.
What is latent heat of fusion?
It is the amount of heat needed to completely fuse a kg of a solid at its fusing temperature.
What is longitude?
It is the angle between a chosen point on the Earth, the center of the planet and the Greenwich meridian.
What is between Mars and Jupiter?
The asteroid belt.
How are black holes created?
They may be created after a supernova.
Which quantities are in the SI?
Lenght, mass, time, electric current, thermodynamic temperature, amount of substance, luminous intensity
What is the formula for latent heat?
Q : m
How do sun rays arrive at the Tropic of cancer during the summer solstice?
They arrive at 90°
What is the sun's radius?
700.000 km
How old is the universe?
13.8 Billion years.