basic questions Flashcards
What are the basic SI units?
s
m
kg
A
K
mol
cd
What kinda motion is presented in the graph?
a.uniform motion
b.uniform acceleration
Uniform acceleration
What kinda motion is presented in the graph?
a.uniform motion
b.uniform acceleration
uniform motion
The first Newton principle of dynamics states
A body acted on by no net force moves with constant velocity
(which can be zero) and zero acceleration.
The second Newton principle of dynamics states
If a net external force acts on a body, the body accelerates
The third Newton principle of dynamics states
If object A exerts a force on B, then B exerts an equal but opposite
force on A
Momentum conservation principle states
the total momentum of a closed system remains constant if no external forces act on it
The torque is defined by…
Cross product of the force F and distance r
M = r x F
r = distance
F = force
The transverse wave is when
the disturbance is perpendicular to the direction of the wave
The longitudinal wave is when
the disturbance is parallel to the direction of the wave
The diffraction is
associated with wave propagation, such as bending, spreading and interference of waves passing by an object or aperture that disrupts the wave
The interference is
Interaction of waves which are correlated or coherent with each
other, either because they come from the same source or because
they have the same or nearly the same frequency.
The reflection is observed when
when a wave encounters a boundary between two different media and is redirected back into the original medium.
The Doppler effect is observed
the change in frequency and wavelength of a
wave as perceived by an observer moving relative to the source of
the waves
If the found intensity is increased twice the wave energy is increased by
2
When localising the source of sound of low frequency the following mechanism is applied
The intensity of the waves are compared
When localising the source of sound of high frequency the following mechanism is applied
the phase of the waves is compared
Polarisation of light is used by
honeybees
Types of polarizations
Linear
Circular
Elliptical
Unpolarized light
An eye is capable to see at long and short distances because
It can adjust the shape of the lens
Does the size of the head matter for recognizing the position of the sound source
Yes, the size of the head matters, this is because the shape and size of the head affect the way sound waves are filtered and modified before reaching the ears.
The mechanical wave can be characterised by
being a wave that happens in a medium
The electromagnetic wave can be characterised by
traveling through a vacuum, without a medium
The gravitational wave can be characterised by
can be characterized by their ability to cause minute deformations in biological structures.
Concentration of optically active compounds can be measured
by measuring the distortion of the polarisation plane angle
1st law of thermodynamics
Energy cannot be created or destroyed
Δ U = Q - W
Δ U = change in internal energy
Q = heat added to the system
W = work done by the system
