A small electric immersion heater is used to heat 100 g of water for a cup of instant coffee. The heater is labelled "200 Watts" (it coverts electrical energy into thermal energy at this rate). Calculate the time required to ring all this water from 23.0 degrees C to 100 degrees C, ignoring heat losses.

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 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?

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

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.

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

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?

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?

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

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