Podcasts about physcasts

This PhysCast is concerned with combinations of resistors in a circuit.

This PhysCast will look at a problem with electric potential for point charges.

This PhysCast will look at a problem where a charged particle is moving through a potential difference.

This PhysCast will look at two capacitors connected in series to a battery.

This PhysCast will look at an example of electromagnetic induction.

This PhysCast will look at calculating the potential from a continuous charge distribution.

This PhysCast will look at using Gauss' Law applied to a problem using a charged wire.

This PhysCast will use the relationship between electric field and electric potential difference to calculate an electric field.

This PhysCast is about capacitants, voltage and charge and combinations of capacitors.

This PhysCast will be looking at the electric field from point charges.

This PhysCast is going to deal with Coulomb's Law and investigating the forces between charged particles.

This PhysCast is going to use Ohm's Law and the idea of electrical power to examine a lightbulb used with two different supply voltages.

This PhysCast is will use Ohm's Law to look at the properties of a small electric motor.

This PhysCast will be analysing a complicated multi-loop circuit.

This PhysCast is going to use Ampere's Law to calculate the magnetic field from a particular arrangement of a current carrying wire.

A capacitor with C=3.1 μF is fully charged using a 6 V battery. The battery is then removed and the capacitor is connected to an uncharged capacitor with C=9.3 μF through a switch. Find the charge on each capacitor once the equilibrium is reached after closing the switch.

This PhysCast is going to look at the resistivity of a piece of material and how to calculate the resistance of a particular arrangement.

This PhysCast is going to look at the magnetic force on a moving charge.

This PhysCast will look at a problem using a circuit containing a resistor and an inductor in series with a voltage source - an RL circuit.

A uniformly charged insulating sphere of radius a and net charge -2Q is placed inside the cavity of a conducting shell of an inner radius b and other radius c. If the shell has a net charge of 3Q and is concentric to the sphere, find the electric field in different regions (a) R

An object is placed 15 cm before a convex lens with focal length 5 cm. A concave lens of focal length 10 cm is placed after the first lens with 20 cm separation between them. Make a ray diagram and confirm your answers by numberical calculations.

How do the currents flowing through copper and iron wires, of same length and diameter, compare if the same voltage is applied across them.

This PhysCast will look at the AC voltages across various components in an RLC circuit.

This PhysCast will look at an AC circuit containing a resistor and capacitor in series.

commons@swinburne.edu.au (Wayne Rowland) Thu, 07 Dec 2017 00:00:00 +1100 Wayne Rowland no 00:08:55 clean This PhysCast explores finding the centre of mass of a continuous mass distribution using integration. physcasts, swinburne 0_ma02cb6b

This PhysCast will be a conceptual discussion on electrix flux through a surface, and how it relates to the enclosed charge.

This PhysCast will look at the broadcast of a radio signal as an example of some properties of electromagnetic waves.

In this PhysCast the collision between two freight cars is explored using conservation of momentum. After the collision their motion is explored using conservation of mechanical energy.

The following PhysCast is a static equilibrium problem involving a climber who crosses a stream using a tree that has fallen across the ravine.

This PhysCast shows some examples of working symbolically with equations.

This PhysCast uses momentum conservation to examine a collision in 2D.

The following PhysCast explores the use of Newtons 2nd and 3rd Law on for two connected objects.

This PhysCast explores how to solve a 2D motion problem where the initial velocity has both horizontal and vertical components.

The following PhysCast is a static equilibrium problem involving a crane and a boom.

This worked problem uses Archimedes' Principle to ensure a safe balloon trip.

This PhysCast explores energy storage in a rotating flywheel.

This PhysCast calculates the speed of a tranverse wave travelling along a stretched spring.

In this PhysCast we are asked to find the centre of mass of a hexagon with six equal sides of length a, but where one of the triangles is missing.

This PhysCast deals with constructing a wave equation from some given information in a diagram.

This PhysCast deals with rotational motion. A merry-go-round rotates from rest with an angular acceleration of 1.50 rad/s2. How long does it take to totate through the (a) first 2.00 rev and (b) the next 2.00 rev?

In this question we have a massless spring with k = 74 N/m and it is hanging from the ceiling.

This PhysCast is going to look at heat flowing through a material by conduction. Two identical sized rods, one made of gold and one made of silver, are joined end to end. The gold end is placed in boiling water and the silver end is placed in ice water. What is the temperature at the point where the rods connect?

In this PhysCast we are asked to find the average translational kinetic energy and the thermal speed of oxygen gas molecules.

This PhysCast is about simple harmonic motion. Two springs are attached to a block which can oscillate on a frictionless floor. If the left spring is removed it oscillates at a frequency of 30 Hz. If instead the right spring is removed it oscillates at a frequency of 45 Hz. What frequency will the block oscillate at if both springs are attached?

This PhysCast is about simple harmonic motion. A 0.12 kg body undergoes simple harmonic motion of amplitude 8.5 cm and a period of 0.20 s. (a) What is the magnitude of the maximum force acting on it? (b) If the oscillations are caused by a spring what is the spring constant?

A PhysCast on Newton's 3rd law of motion.

In this PhysCast we are asked to consider the motion of two blocks connected by a cord. Block A has a mass mA = 4.0kg, and block B has a mass mB = 2.0kg. The coefficient of kinetic friction between block B and the horizontal plane is [Mu]k = 0.05. The inclined plane is frictionless at an angle of [Theta] = 30 degrees. The pulley serves only to change the direction of the cord connecting the blocks. The cord has negligible mass. Find (a) the tension in the cord and (b) the magnitude of the acceleration of the blocks.

In this PhysCast we want to review Bernouillis equation, understand what the terms mean, and how they can be applied to a series of situations where we have fluid flow through a pipe.

A PhysCast on buoyancy.

A PhysCast on centre of mass.

A PhysCast on the kmol concept.

A PhysCast on experimental uncertainties.

In this PhysCast we look at how you can propagate errors in laboratory measurements.

This PhysCast is about the first law of thermodynamics. A closed by uninsulated container at room temperature containing 1 kg of water is shaken violently until the temperature rises by 5 degrees C. The mechanical work required in the process is 22 kj. a) How much heat is transferred during the shaking? b) How much mechanical energy would have been required had the container been perfectly insulating?

This question is about rolling motion and conservation of energy. A solid sphere and a silid disc with identical masses and radii roll down a slope without slipping. Using energy considerations, which has the greatest velocity when it reaches the bottom of the slope.

This PhysCast explores the mathematics of simple harmonic motion.

This PhysCast is going to look at a very commonly used example in collision physics - the Newton's Cradle.

This question is about energy and rotational motion. A bowler bowls a 160g cricket ball with a diameter of 7cm with a linear velocity of 144km/h. The ball is measured to rotate at 22250 r.p.m. What proportion of the ball's kinetic energy is rotational?

In this PhysCast we are asked to consider the motion of a uniform cylinder of mass m and radius R as it rolls smoothly down a ramp at angle theta to the horizontal. We are asked to find an expression for the linear accceleration of the centre of mass of the cylinder.

This PhysCast deals with simple harmonic motion where dampening is present. The amplitude of a lightly damped oscillator decreases by 3.0% during each cycle. a) What percentage of the mechanical energy is lost in each cycle? b) What is the dampening coefficient for the 100 g mass if the cycle time is 1 sec?

A wave on a taut wire is described by the equation y=1.5sin(0.10x-560t), where x and y are in cm and t is in seconds. Find the: a) Amplitude, b) Wavelength, c) Period, d) Wave speed of the wave.

This problem is about acceleration in uniform circular motion. A jet is diving vertically downward at 1080 km/hr. The pilor will lose consciousness if the accceleration exceeds 5g. At what height above the ground must the pilot start a quarter turn to pull out of the dive.

This Physcast asks us to consider the motion of a block which is falling onto a spring. A 250g block is dropped onto a relaxed vertical spring that has a spring constant k = 2.5 Ncm-1. The block becomes attached to the spring and compresses the spring 12 cm before momentarily stopping. While the spring is being compressed, what work is done on the block by a) the gravitational force and b) the spring force? c) What is the speed of the block just before it hits the spring? (Assume that friction is negligible).

This PhysCast looks at a conservation of energy problem. A 60 kg skier leaves the end of a ski-jump ramp with a velocity of 24 m/s directed 25 degrees above the horizontal. Suppose that as a result of air drag the skier returns to the ground with a speed of 22 m/s, landing 14 m vertically below the end of the ramp. From the launch to the return to ground, by how much is the mechanical energy of the skier-Earth system reduced because of air drag?

This PhysCast is going to look at a problem involving static equilibrium. A 60 kg child sits at the end of a 2.4 metre board supported by a p;ivot, 80 cm away, and a scale at the other end. If the scale reads zero, what is the mass of the board.

An anchor of mass 500kg is attached to a light cable that passes over a roller of negligible mass and winds around a hollow cylindrical drum of radius 1.2m and mass 250kg which can rotate around a frictionless axel. The anchor is released and drops 18m to the surface of the water. Use energy considerations to calculate the angular velocity of the drum when the anchor hits the water.

This PhysCast is about uniform circular motion. A puck of mass m1 is rotated in a circle of radius R on a frictionless air-hockey table. It is connected to a stationary, suspended mass m2 by a cord passing through a hole in the table. Find a) The tension in the cord b) The speed on the puck c) The period of the rotation.

This question is about standing waves on a string. A wire 37cm long is clamped at both ends The wave speed along the wire is 324.6 m/s. Find a) The standing wave with the longest wavelength that can exist on this wire? b) The lowest standing wave frequency?

The following PhysCast is about a sphere which is attached to a wall. A uniform sphere of mass m = 0.85 kg and radius r = 4.2 cm is held in place by a massless rope attached to a frictionless wall a distance of L = 8.0 cm above the centre of the sphere. Find (a) the tension in the rope and (b) the force on the sphere from the wall?

This PhysCast will apply Newton's second law of motion in its rotational form. A cylindrical satellite is 1.4 m in diameter with its 940 kg mass distributed uniformly. The satellite is spinning at 10 rpm but must be stopped for repairs. Two rockets provide 20 N of thrust each and are mounted on opposite sides to fire tangentially. How long must they be fired to stop the rotation?

This PhysCast is about oscillatory motion. Two identical springs of spring constant 7580 Nm-1 are attached to a block of mass 0.295 kg. What is the frequency of oscillation on a frictionless floor?

This PhysCast is going to examine an example of using the first law of thermodynamics to analyse a cyclic process.

This PhysCast will look at a problem involving a merry go round with some people jumping onto it.

This question deals with a wave which is travelling along a string.

This PhysCast will analyse a motion problem using conservation of energy. A 1.25 kg ball is attached to the ground by a spring with k = 22 N/m and upstretched length of 0.55 m. The ball is thrown straight upwards, being released when it is 1.0 m above the ground, moving at 12.0 m/s. How fast is the ball moving when it is 2.0 m above the ground?

This PhysCast is going to look at standing waves on a stretched string. A 45 gram string is tightly stretched and fixed firmly at each end. The tension in the string is 78 N, and it vibrates with its 3rd harmonic at 120 Hz. How long is the string?

The following PhysCast deals with the situation involving this unusual looking wheel. A constant horizontal force of 10 N is applied to a wheel of mass 10 kg and radius 0.3 m. The wheel rolls smoothly on a horizontal surface, and the acceleration of its centre of mass has magnitude of 0.60 ms -2. a) What is the frictional force on the wheel? b) What is the rotational inertia of the wheel about the rotation axis through its centre of mass?

This problem is about uniform circular motion. A plane turns by banking at an angle of 30 degrees to the horizontal. If the radius of curvature of the turn is 10km and the plane maintains a constant height above the ground, what is the speed of the plane?

This is a PhysCast on 2 dimensional motion. A raging flood has washed away a section of highway, creating a gash 1.7 meters deep. A car moving at 31 m/s goes straight over the edge. How far from the edge of the washout does it land?

This PhysCast is about thermodynamic processes. One mole of oxygen (assume it to be an ideal gas) expands at a constant temperature of 310 K from an initial volume V1 = 12 L to a final volume V1 = 19 L. How much is done by the gas during expansion?

The following PhysCast deals with a non-uniform bar which is suspended and in static equilibrium. A nonuniform bar is suspended at rest in a horizontal position by two massless cords. One cord makes the angle theta = 36.9 degrees with the vertical; the other makes the angle phi = 53.1 degrees with the vertical. If the length of the bar is 6.10 m, compute the distance x from the left end of the bar to its centre of mass.

In this PhysCast we are told that a horseshoe has a surface are of 50cm2 and a blacksmith heats this to a red hot 810 degrees C. What rate does it radiate energy?

This PhysCast is going to look at static equilibrium applied to a ladder leaning against a wall. A ladder of mass m and length L is leaning against a wall. The wall is frictionless and the coefficient of static friction between the ladder and the ground is mu. Find an expression for the minimum angle which the ladder can be lent without slipping?

In this PhysCast a camper hangs a 26 kg pack between two trees using separate roles of different lengths. Find the tension in each rope.

This PhysCast looks at objects colliding and how to analyse them in terms of momentum. A child on a skateboard is moving along a horizontal surface at 5.0 m/s, when they collide with a rubber ball rolling towards them at 3.5 m/s. The ball has a mass of 2.2 kg, and after the collision is moving at 6.0 m/s opposite to its intial motion. The combined mass of the child and their skateboard is 45 kg. What is the velocity of the skateboarder after colliding with the ball?

This Physcast follows on from the first momentum tutorial (Rathkeale Physics - Momentum 1). It involves two stationary ice skaters pushing apart on ice. Conservation if momentum is used to determine the velocity of one of the skaters.

A brief introduction to momentum and conservation of momentum. This tutorial includes a problem involving the collision of a locomotive with a stationary carriage. The two objects stick together after the collision and the combined velocity is determined using conservation of momentum.

Physcast Tutorial on how to determine the range of a projectile that is launched at an angle. NCEA Excellence.

Physcast Tutorial on how to solve a torque equilibrium problem involving a bridge (girl standing on a bench). This kind of problem is normally worth NCEA Excellence.

Physcast tutorial on how to solve a basic torque equilibrium problem involving a seesaw.