Video-analysis Based Tasks in Physics:
Video-analysis Based Tasks in Physics:
To view a video it is necessary to install Flash Player!
To further analyze the problems it is necessary to download the programs TRACKER (http://www.cabrillo.edu/~dbrown/tracker/), Java 1.5 and QuickTime 7.
| Kinematics of Mass Point – Motions along a Straight Line |
|
Find the speed of the train!
(The length of the carriage is 26.4 m, the height and the width of the carriage’s window including the frame is 1.1 m x 1.35 m.) Source: vlak.avi |
Find the deceleration of the train!
(The length of the carriage is 24.5 m, the height and the width of the carriage’s window including the frame is 0.96 m x 1.27 m.) Source: brzdenie_vlaku.avi |
| Kinematics of Mass Point – Motions at a Non-Constant Speed |
|
Find the acceleration (deceleration) of the train.
Source: vlak_brzdenie.jpg, vlak_rozbeh.jpg |
Analyze the motion of the rocket. Find its speed and acceleration right after firing.
What maximum height will the rocket reach? (Length of the meter: 1 m, frequency of taking pictures: 120 fps) Source: raketa.avi, raketa_odpal.avi |
| Kinematics of Mass Point – Rotational Motion |
|
Find the angular speed of the rotation of the wheel!
Find the angular acceleration during the braking of the wheel!
(Length of the meter: 1 m) Source: koleso.avi, koleso_2.avi, koleso_120.avi (120 fps) |
Find the period and the frequency of the plane’s propeller during its flight!
(Frequency of taking pictures: 1000 fps) Source: vrtula.avi |
| Kinematics and Dynamics of Mass Point – Upward Vertical Motion with an Initial Speed |
|
Find the Earth’s free fall acceleration!
What is the speed with which is the ball tossed up and with which it hits the ground?
(Length of the meter: 1 m, mass of the ball: 0,580 kg, frequency of taking pictures: 120 fps) Source: vrh_nahor.avi |
Analyze this motion. Find the expression for the speed of the ball as a function of time.
What force is acting on the ball as it is tossed up?
(Length of the meter: 1 m, mass of the ball: 0,290 kg, frequency of taking pictures: 30 fps) Source: vrh_nahor2.avi |
| Kinematics and Dynamics of Mass Point – Downward Vertical Motion with an Initial Speed |
|
Analyze the velocity of the ball’s motion. Find the force acting at the moments of rebounds.
(Length of the meter: 1 m, mass of the ball: 0,610 kg, frequency of taking pictures: 120 fps) Source: vrh_nadol.avi |
Analyze this motion. Find the expressions for the vertical and horizontal components of the velocity of the ball as functions of time.
What force is acting on the ball as it is tossed down?
(Length of the meter: 1 m, mass of the ball: 0,580 kg, frequency of taking pictures: 120 fps) Source: vrh_nadol2.avi |
| Kinematics and Dynamics of Mass Point – Horizontal Motion and Projectile Motion |
|
Find the Earth’s free fall acceleration!
What is the horizontal component of the ball’s velocity? What force is acting on the ball?
(Length of the meter: 1 m, mass of the ball: 0,580 kg, frequency of taking pictures: 120 fps) Source: vodorovny_vrh.avi |
Analyze this motion.
Find the expressions for the vertical and horizontal components of the velocity of the ball as functions of time.
What force is acting on the ball in the moment of kicking?
(Length of the meter: 1 m, mass of the ball 0,421 kg, frequency of taking pictures: 120 fps) Source: sikmy_vrh.avi |
| Kinematics and Dynamics of Mass Point – Projectile Motion |
|
Analyze the motion.
Find the expressions for the components of the momentum and its change as functions of time.
What is the force with which is the foot acting on the ball in the course of kicking?
(Length of the meter: 1 m, mass of the ball: 0,421 kg, frequency of taking pictures: 120 fps) Source: odkop.avi |
Analyze the motion. Find the expression for the magnitude of the ball’s velocity.
What force is acting on the ball in the course of kicking and rebounding from the wall?
(Length of the meter: 1 m, mass of the ball: 0,421 kg, frequency of taking pictures: 120 fps) Source: odkop_stena.avi |
| Dynamics of Mass Point – Force |
|
What is the force acting on the cork stopper when oppening a bottle of champagne?
(Length of the segment: 1 cm, mcork = 9,6 g, frequency of taking pictures: 1000 fps) zdroj: sampanske.avi |
Analyze the motion of the balls fired from the Gauss’s gun.
(Length of the meter: 0,5 m, frequency of taking pictures: 1000 fps) Source: Gauss_delo.avi |
| Dynamics of Mass Point – Force, Work, Energy |
|
What is the magnitude of the force acting on the free falling sphere?
What is the force with which the sphere is acting at the moment of hitting the ground?
(Length of the meter: 1 m, mass of the sphere: 0,7265 kg, frequency of taking pictures: 120 fps) Source: guľa.avi |
Find the force acting on the sphere during its free fall and in the course of hitting the can.
What work will be done in the process of deforming the can?
(Length of the meter: 1 m, mass of the sphere: 0,7265 kg, frequency of taking pictures: 120 fps) Source: plechovica_0.47m.avi, plechovica_0.80m.avi, plechovica_1.12m.avi |
| Newton’s laws |
| Analyze the motion of a ball after hitting it with a hockeystick in the horizontal direction. How will the ball’s motion change if the hockeystick will be acting on it for a short time in the vertical direction?
(Length of the meter: 1 m, frequency of taking pictures: 120 fps) Source: hokej.avi |
Analyze the motions of the students sitting on the chairs when first the first student is acting with a force, then the other student, and finally mutually both students.
(Length of the meter: 1 m, mboy is about 80 kg, mgirl is about 60 kg, frequency of taking pictures: 30 fps) Source: 3NPZ.avi |
| Elastic forces |
|
Determine the force constant of the spring in a pen.
(Length of the segment: 0,01 m, mpen = 6 g, frequency of taking pictures: 120 fps) Source: tuhost_pruziny.avi |
Analyze the motion of the ball attached to a spring (string). What are the forces acting on the ball in motion?
(Length of the segment: 0,01 m, mball = 0,87 kg, frequency of taking pictures: 120 fps) Source: kyvadlo_pruzina.avi, kyvadlo_gula.avi |
| Earth’s Gravitational Field – Free Fall |
|
Find the Earth’s free fall acceleration!
(Length of the meter: 1 m) Source: volny_pad.avi (30fps), odrazy.avi (1000 fps) |
Analyze the motions in the Earth’s gravitational field.
When it is possible to neglect the air resistance?
(Length of the meter: 1 m, frequency of taking pictures: 120 fps, masses of the balls: m1 = 2,5 g, m2 = 24,9 g) Source: volny_pad_2.avi, volny_pad_2gulocky.avi (30 fps), volny_pad.avi (120 fps, mkov = 727 g, mguma = 25 g) |
| Centrifugal (centripetal) force |
|
A bottle filled with water is attached to a string. A students is holding the other end of the string and at some moment he starts turning the whole system
in a vertical plane in such a way that the bottle is moving around a circle with the center at the point of taking hold of the string that is constantly pulled
taut. What must be the minimal speed of the bottle in order for it just not to fall down at its maximum height above the ground?
(height of student = 1.8 m) Source: odstrediva_sila.avi, autor: student Fačkovec, Source: glass of water otoc.avi |
A ball is attached to one end of a rubber band whose other end is mounted to a vertical axis. The ball is moving with a constant speed around a circle lying in a horizontal plane around this axis in such a way that the rubber band is pulled taut at all times. In a certain moment the rubber band breaks. What will be the direction of motion of the ball?
(Length of the meter: 1 m, frequency of taking pictures: 120 fps) Source: lopta_na_niti.avi |
| Rigid body – Ballistic Pendulum |
|
Find the velocity of the projectile before it hits the can!
(Length of the can: 16,7 cm, mass of the projectile: 0,1 g, mass of the can: 15,8 g, frequency of taking pictures: 120 fps) Source: balisticke_kyvadlo.avi |
Verify the preceeding computation of the projectile’s velocity with its value obtained from
the video recorded with the frequency of taking pictures of 1000 fps. (Outer diameter of the circular beginning of the can: 53,92 mm, frequency of taking pictures: 1000 fps) Source: rychlost_strely.avi |
| Frictional forces and pulley |
|
Does the magnitude of the frictional force depend on the size of the contact area?
(Length of the segment: 1 cm, frequency of taking pictures: 30 fps) Source: trecie_sily.wmv |
A worker pulls up material first using a rope and then using a pulley. In which case is he acting with a force of smaller magnitude? What is the work done by the worker in both cases if the material is lifted to the same height?
Source: kladka.wmv |
| Frictional Forces |
|
Find the coefficient of sliding friction between the boots’ sole and the ice!
(Length of the meter: 1 m, frequency of taking pictures: 30 fps) Source: trenie.avi |
What are the distances along which the braking Škoda Octavia 1.6 LX comes to a stop when the braking starts at initial speeds 20, 40, 60, 80 km/h?
(The car started braking when passing by the white vertical rode.)
(Length of the car: 4,511 m, frequency of taking pictures: 25 fps) Source: auto.avi, author of the video: Andrej Karlubík, created as a part of thesis under the supervision of P. Horváth at FMFI UK in Bratislava. |
| Car Braking Distances on Dry and Wet Road |
|
Find the braking distance of the car Citroen C6 during braking on a dry road.
Find the average acceleration and the initial speed at the beginning of braking!
(Car’s length: 4,908 m, frequency of taking pictures: 50 fps) Source: C6.avi, C6_2.avi authors of the video: Ing. Ján Ondruš, PhD. et al. |
Find the braking distance of the car Citroen C6 during breaking on a wet road.
Find the average acceleration and the initial speed at the beginning of braking!
(Car’s length: 4,908 m, frequency of taking pictures: 50 fps) Source: C6_dážď.avi authors of the video: Ing. Ján Ondruš, PhD. et al. |
| Car Braking Distances on Dry and Wet Road with Different Initial Speeds |
|
Find the braking distance of the car Citroen C6 during breaking on a dry road with different initial speeds. Find the average acceleration and the coefficient
of friction between the tire and the dry asphalt!
(length of car: 4,908 m, frequency of taking pictures: 30 fps) Source: Citroen.wmv |
Find the braking distance of the car Citroen C6 during breaking on a wet road with different initial speeds. Find the average acceleration and the coefficient
of friction between the tire and the wet asphalt!
(length of car: 4,908 m, frequency of taking pictures: 30 fps) Source: Citroen_mokro.wmv |
| Car braking distances on a road with and without gravel |
|
Compare the braking distances of the car Citroen C6 when braking on a gritted road (gravel after the winter maintainance) and on a road from which the grit has
been removed. Process the results graphically.
(Car’s length: 4,908 m, frequency of taking pictures: 120 (30) fps) Source: Citroen_posyp.wmv |
Find the braking distance of the truck (m = 22 000 kg) during breaking on a dry and wet road with different initial speeds. Find the average acceleration
and the coefficient of friction between the tires and the dry/wet asphalt!
Does the lehgth of braking distance depend on mass of car?
(length of small car (VW): 4,605 m, height: 1,430 m, frequency of taking pictures: 30 fps) Source: domiesavac.wmv |
| Car Braking Distances on Dry and Wet Road on Summer Tires |
|
Find the braking distance of the car Mazda3 during braking on a dry road.
Find the average acceleration and the initial speed at the beginning of braking!
(Car’s length: 4,505 m, frequency of taking pictures: 30 fps) Source: Mazda3.wmv, authors of the video: Ing. Ján Ondruš, PhD. |
Find the braking distance of the car Škoda Felicia during braking on a wet road!
Find the average acceleration and the initial speed at the beginning of braking!
(Car’s length: 3,883 m, frequency of taking pictures: 30 fps) Source: felicia_mokro.avi |
| Car Braking Distances on Snow Road on Winter Tires |
|
Find the braking distance of the car Renault Thalia during braking with an initial speed of 20 km/h
on a dry, wet, snow and ice road!
(Car’s length: 4,171 m, frequency of taking pictures: 30 fps) Source: Thalia.wmv, |
Find the braking distances of the cars during braking on a snow road with different initial speeds!
(Frequency of taking pictures: 30 fps) Source: auta_sneh.wmv |
| Car Braking Distances on Wet and Dry Road on Winter Tires |
|
Find the braking distances of the car Renault Thalia during braking on a wet road with different initial speeds! Find the average accelerations and the initial speeds at the beginning of braking!
(Car’s length: 4,171 m, frequency of taking pictures: 30 fps) Source: Thalia_mokro.wmv |
Find the braking distances of the car Renault Thalia during braking on a dry road with different initial speeds! Find the average accelerations and the initial speeds at the beginning of braking!
(Frequency of taking pictures: 30 fps) Source: Thalia_sucho.wmv |
| Coefficient of Sliding Friction and Rolling Motion |
|
Evaluate the coefficient of sliding friction between steel and various materials and with the help
of tables try do determine what are these materials! (Frequency of taking pictures: 30 fps) Source: koeficient_trenia.avi |
Compare the speed of the translational motion of the wheel and the speed of the translation
of the belt below and above the wheels!
(Length of the meter: 10 cm, frequency of taking pictures: 120 fps) Source: lego_robot.avi |
| Mechanics of Rigid Body |
|
Find the position of the center of mass of the axe and the ratio of the masses of its handle and
its metal part!
(Length of the meter: 0,3 m, axe's mass: 1,5kg) Source: sekera_tazisko.jpg Find the center of mass of a can and explain why it is located at this position. Source: plechovica.jpg |
The Leaning Tower of Pisa is 55 m high and its diameter is 7 m. The perpendicular distance of the
top of the tower from the vertical line passing through the center of its bottom is 4.5 m. Let us assume that the tower is a homogenous
cylinder. What would be the minimum additional perpendicular displacement of the top of the tower
from the vertical line passing through the center of its bottom in order for the tower to fall down?
What would be the corresponding angle between the axis of the tower and the vertical direction?
Source: Pisa.jpg |
| Mechanics of Rigid Body – Center of Mass |
|
Analyze the motion of the hammer as motions of its two parts – the handle and the metal part.
What will be the motion of their center of mass?
(Length of the hammer: 0,3 m, mass of the hammer: 0,35 kg, frequency of taking pictures: 120 fps) Source: kladivo.avi |
Analyze the motion of the axe as motions of its two parts – the handle and the metal part.
What will be the motion of their center of mass?
(Length of the meter: 1 m, mass of the hammer: 1,5kg, frequency of taking pictures: 120 fps) Source: sekera_tazisko.avi |
| Rolling Motion along an Incline |
|
Analyze the rolling motion of the spheres along the incline. The materials from which the spheres
are made and their masses and diameters are the following: metal (m = 727 g, d = 72 mm), wood
(m = 5.9 g, d = 29 mm), rubber (m = 6.6 g, d = 23 mm).
Which of the spheres reaches the end of the incline with the largest speed? Explain!
(Frequency of taking pictures: 120 fps, length of the meter: 1m) Source: valenie_gule.avi Does the speed of the rolling of the spheres depend on mass? (valenie.flv) |
Analyze the motion of the cans along the incline. Which of them is full (m = 523.2 g) and which of
them is empty (m = 15.8 g)? Find the moment of inertia of each can.
(Frequency of taking pictures: 120 fps, length of the meter: 1m, diameter of the can d = 65.6 mm) Source: plechovice.avi Does the speed of the motion of a cylinder along an incline depend on its mass? Explain! (dva_valce.flv) |
| Rolling Motion along an Incline |
|
Analyze the rolling motion of the sphere along the incline with different angles. Find the acceleration and speeds of sphere. What forces are acting on the ball?
(1 black squere segment: 1cm, frequency of taking pictures: 120 fps, m = 25g) Source: naklonena_rovina_uhol.avi |
Analyze the rolling motion of the pucks along the incline. Find the acceleration of pucks. What forces are acting on the pucks?
(1 black squere segment: 1cm, frequency of taking pictures: 120 fps, morange_puck = 50g, mblue_puck = 157g, mball = 60,4 g) Source: naklonena_rovina_puky.avi, naklonena_rovina_puk_lopta.avi |
| Rolling Motion along an Incline and Projectile Motion |
|
The mass of one of the spheres is 10 times larger than the mass of the other one. The spheres are rolling along a horizontal table at approximately equal speeds.
At the end of the table they fall down. What will be the horizontal distances of the points at which the spheres hit the ground from the table?
(Length of the meter: 1 m, m1 ping-pong ball = 0.0025 kg, m2 = 0.025 kg, frequency of taking pictures: 120 fps) Source: vodorovny_vrh.avi |
Spheres are rolling down an incline that is placed at a certain height above ground. What will be the horizontal distances of the points at which the spheres
hit the ground from the end of the incline? Do the analysis for spheres of various masses and fillings (solid, hollow).
(Length of the meter: 1 m, m1 ping-pong ball = 0.0025 kg, m2 = 0.025 kg, frequency of taking pictures: 120 fps) Source: zo_strechy.avi, zo_strechy2.avi (mgrey) = 18.7 g; morange = 60.4 g. |
| Rolling Motion along an Incline and Projectile Motion |
|
The cylinders with different mass are rolling down an incline that is placed at a certain height above ground. What will be the horizontal distances of
the points at which the cylinders hit the ground from the end of the incline?
(Length of the black squere segment: 1 cm, frequency of taking pictures: 120 fps, masses of cylinders: m1 = 1.807 kg, m2 = 0.640 kg, m3 = 0.264 kg) Source: strecha_valce.avi, strecha_gule.avi, (120fps, masses of spheres: m1 = 727g, m2 = 870g, m3 = 25g, m4 = 5.9g, m5 = 6.6g), strecha_disky.avi, (120fps, masses of disces: m1 = 233g, m2 = 86g, m3 = 55g) |
The sphere and cylinder are rolling down an incline that is placed at a certain height above ground. At the end of the table they fall down. What will be
the horizontal distances of the points at which the sphere and cylinder hit the ground from the table?
(Length of the black squere segment: 1 cm, frequency of taking pictures: 120 fps, msphere = 727g, mcylinder = 640g) Source: strecha_gula_valec.avi, |
| Mechanical Properties of Solid Materials – Deformation of a Solid |
|
What are the force and the pressure with which is the axe acting on the chopping block?
(Length of the meter: 0,3 m, mass of the axe: 1,5 kg, dimensions of the axe’s cutting edge: thickness x width = 0.5 mm x 102 mm, frequency of taking pictures: 120 fps.) Source: sekera.avi |
What are the force and the pressure with which is the skiver acting on the chopping block in the course
of hitting it?
(Length of the meter: 0.3 m, mass of the skiver: 4.1 kg, dimensions of the contact part: thickness x width = 2.3 mm x 87 mm, frequency of taking pictures: 120 fps) Source: kalac.avi |
| Mechanics of Liquids |
|
Estimate what is the speed of the water falling from the roof of the chateau when hitting the
ground of its court.
(Assume the height of a person to be 1,7 m.) Source: wawel.jpg Source: kopernik.jpg |
Estimate the density of the piece of wood floating in the water.
(Length of the meter: 0,15 m) Source: drevo.jpg |
| Mechanics of Liquids - Pressure and the Equation of Continuity |
|
Find the density of the liquid in the U tube. The purple liquid is water. Density of water = 1000 kg/m3).
Source: hustota.jpg |
Find the speed of squirting water from syringe and compare it with speed of the motion of the piston. Verify the validity of the equation of continuity.
(Length of the squere segment: 0.01 m, frequency of taking pictures: 30 fps) Source: rovnica_spojitosti.avi, autor: Ivana Pačechová |
| Mechanics of Liquids – Hydrodynamics |
|
What is the relation between the height of the top of the liquid in the container above its bottom
and the heights h1 and h2 of the openings in the wall of the container above
its bottom if the liquid squirting from both openings crosses the horizontal plane on which the
container is placed at the same point? Prove!
Source: vytok_vody.avi, rychlost_vody.avi |
Find the dynamic viscosity of the liquid in the graduated cylinder. The density of glass is 2500 kg/m3, the density of glycerin is 1260 kg/m3.
(Length of the segment: 1 cm, frequency of taking pictures: 30 fps) Source: viskozita.avi |
| Structure and Properties of Liquids |
|
Find the surface tension of water in contact with air!
(Length of one division: 1 cm, frequency of taking pictures: 120 fps) Source: kvapka.avi |
Find the capillary pressure inside the soap bubble.
( mNm-1.)
(Length of one division: 1 cm. The surface tension of the solution of soap in water in contact with air is 40 mN/m) Source: bublina.jpg, kocka.jpg, valec.jpg |
| Properties of Liquids and Gases |
|
Water of equal volume flows out of two containers - from the bottom of the first container through
a shorter drinking straw, from the bottom of the second container through a longer drinking straw.
From which of the two containers will the water flow out first? Justify!
Source: vytekanie kvapaliny.avi |
In which of the two balloons filled with air that differ by their volumes is a higher pressure?
What will happen after opening the connecting ventil? Explain!
Source: tlak plynu.avi |
| Oscillatory Motion – Mathematical and Physical Pendulum |
|
Describe the motion of mathematical pendulum, i.e. write down expressions for its angular
displacement, angular velocity and angular acceleration. Find the angular frequency and the phase constant
of this oscillatory motion and from its period compute the value of the acceleration due to gravity!
(Length of the meter: 1 m, length of the mounting: 3 m) Source: matematicke_kyvadlo.avi |
Write down equations describing the motion of physical pendulum. Give expressions for its angular
displacement, angular velocity and angular acceleration. Find the pendulum’s angular frequency and period!
(Length of the meter: 0.2 m, mass of the pendulum: 308 g) Source: fyzikalne_kyvadlo.avi |
| Frequency and period of oscillatory motion |
|
Find the period and the frequency of oscillations of the tuning fork!
(length of the division: 1 cm, frequency of taking pictures: 1000 fps) Source: ladička.mov |
Find the period and the frequency of oscillations of the neon lamp!
(frequency of taking pictures: 1000 fps) Source: lampa.flv |
| Oscillatory Motion |
|
Write down equations that describe the oscillatory motion of the body, i.e. give expressions for its
instantaneous linear displacement, instantaneous velocity and instantaneous acceleration. Find the angular
frequency and the phase constant of this motion.
(Length of the meter: 0.5 m, mass of the body: 81 g) Source: kmity_pruzina.avi |
Analyze this oscillatory motion, i.e. write down equations expressing the instantaneous linear
displacement, the instantaneous velocity and the instantaneous acceleration and find the angular frequency
and the phase constant of this oscillatory motion.
(Length of the meter: 0.5 m, frequency of taking pictures: 30 fps) Source: tlmene_kmity.avi |
| Oscillatory Motion – Coupled Pendulums |
|
Analyze the motion of the coupled pendulums. Find the frequency of the beats!
(Length of the meter: 0.5 m) Source: spriahnute_kyvadla.avi |
Analyze the motion of the coupled pendulums. Find the frequency of the beats!
(Length of the meter: 1 m, frequency of taking pictures: 30 fps) Source: spriahnute_kyvadla.avi |
| Wave Motion |
|
Find the speed of the wave traveling along the spring. What is the relation between this speed and the
length of the spring?
(Length of the meter: 1 m, frequency of taking pictures: 120 fps) Source: pružina_vlny.avi |
Analyze the motion of the waves, find their speed. How do the waves reflect at the fixed end? Does the
speed of the wave change when the stretching of the spring changes?
(Length of the meter: 1 m, frequency of taking pictures: 120 fps) Source: vlny.avi |
| Acoustics |
|
Find the frequency of the beats.
video 1, Autor of the video 2: M. Němec (KFEAM DF TU Zvolen), Source: klavir.mp3, husle.mp3, to perform the analysis use the program Audacity |
Find the speed of the car’s motion when the speed of sound in the air is approximately 340 m/s.
Author of video 1: M. Dobiasová, Author of video 2: M. Němec (KFEAM DF TU Zvolen), Source: auto_trubenie.mp3, doppler.mp3, to perform the analysis use the program Audacity |
| Speed of Sound in Material Substances |
|
From the positions of the maxima (minima) of the sound waves find the speed of sound in the air.
(One division: 1 cm, length of the meter: 30 cm.) Source: Kundtova_trubica_1.avi, Kundtova_trubica_1.mp3, Kundtova_trubica_2.avi, Kundtova_trubica_2.mp3, to perform the analysis use the program Audacity |
Find the speed of sound in two rods of length 37.2 cm and 110 cm, respectively, and try to guess what
material are the rods made of!
Source: tyč.avi, tyč.mp3, to perform the analysis use the program Audacity |
| Thermodynamics |
|
What is the amount of heat absorbed by 1 liter of water that is placed in a solar cooker when heated to a
higher temperature? What is the power of the solar cooker?
Source: slnečný_varič.jpg |
Find the incoming power and the outgoing power of the fastboiling kettle when its efficiency is 85%. (The
initial temperature of the water is 18 °C, the volume of the water is 0.5 l, the specific heat of water is
4186 J.kg-1K-1.)
Source: varna_kanvica.flv |
| Explain … |
|
Why does the match box in the course of turning it over from the horizontal to the vertical position in the first situation stop and in the second
situation fall over? Explain!
Source: zápalky.flv |
Explain the phenomenon you observe on the video.
Source: spojné nádoby.flv, author of the video: Michal Hranický et al. |
This webpage has been created within the projects KEGA No. 075-008ŽU-4/2010 and 035ŽU-4/2012 and Foundation Volkswagen Slovakia No. 052/12.
ISBN: 978-80-554-0811-8
