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The diagram shows a boat pulling a water skier, The arrow represents the force on the water produced by the engine propeller.
This force causes the boat to move.
Explain why.
The force from the boat pulling the water skier forwards
will be...
Why is the component labelled ‘J’ included in the circuit?
Uranium-235 is used as a fuel in some nuclear reactors.
Name one other substance used as a fuel in some nuclear reactors.
What is meant by thinking distance?
State two factors that affect thinking distance.
Applying the brakes of the car causes the temperature of the brakes to increase.
Explain why..
State and explain the benefit of a hybrid car being fitted with a regenerative braking
system.
The table gives some information about an atom of iodine-131, complete it
Complete the sentence.
The number of protons in an atom is called the proton number or
the .............................. number.
The decay of iodine-131 can be represented by the equation below.
Complete the equation...
Calculate how many days it will take for the count rate from the sample of rainwater to fall to 75 counts per second.
Half-life of iodine-131 = 8 days
In Japan, people likely to be drinking water contaminated with iodine-131 were advised
to take tablets containing a non-radioactive isotope of iodine.
Suggest why this advice was given.
What is the difference between an alternating current and a direct current?
