motion
Which part of physics does learn motion?
Mechanic
What is the unit of the electric current?
Ampere [A]
What happened to a white light after passed through a prism?
The light is splitted in different colors
How sounds are produced?
By vibration of the air.
How many parts does have mechanics?
2, kinematics and dynamics
What is the SI unit of electric charge?
Coulomb [C]
Name 2 kinds of lenses?
Converging, diverging
What is the spectrum of frequencies a human can ears?
20 to 20000 Hertz
What the first Newton's law establish?
An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Why we use capacity?
For saving electric charge.
What different between virtual and real image?
The virtual is upright, the real is inverted
what is frequency and period of the vibration?
Frequency: Number of vibration in one second
Period: number of seconds for one vibration
How we can find impulse of a force?
Force multiple by time the force is acting on object
What is AC?
alternative current - current which change voltage and amperage
What is meant by the focus point of a converging lens?
The converging point is the place where all light rays will arrive (converge) after crossed the lens
What is ultrasound and infrasound?
These sounds are out of range of frequencies that humain can ear. Infrasound under 20 hertz and ultrasoud over 20000 hertz
What is the SI unit of this: N/m2?
Pascal [Pa]
What meter is used to measure p.d.?
Voltmeter
Give the law of reflection?
When a ray of light reflects off a mirror a ray bounces off the surface of the mirror. The incident ray with an incident angle and the reflected ray with an reflected angle are equal.
What means the following characteristics of a wave:
1. pitch?
2. louder?
1. The frequency at which the sound is produced
2. The amplitude of the sound