11 (a)
12
2400W
240V
Heating
element
Figure 11.1
(0
State the power rating of the kettle in kilowatts.
(ii)
How many units of electric energy would the use in 4 hours when connected to a 240v mains?
(iii)the cost of electricity is 30n. how much does it cost
to use the kettle for four (4) hours?
(iv)
Calculate the current flowing through the element of the kettle
when in use.
(v)
Suggest the size of a fuse suitable for the plug of this electric kettle.

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.

If the area of a square has increased by a factor of 16, by how much has each side increased?