GCSE Science
1st April 1992
- 1Radioactivity, Half-Life and Nuclear Uses
Radium-226 (atomic number 88) decays by alpha emission. State the atomic number of the nucleus formed.
- 2Forces
A gardener pushes a mower with a force of 60 N through a distance of 8.0 m. Calculate the work done. Use W = F x s.
- 3Motion: Speed, Velocity and Acceleration
A runner completes a 400 m race in 52 s. Calculate her average speed, giving your answer to 3 significant figures.
- 4Forces, Newton's Laws and Momentum
Explain, using Newton's Third Law, why a swimmer is able to push themselves forward by pushing backward against the water.
- 5Pressure, Moments and Levers
A box of weight 120 N has a base area of 0.40 m^2. Calculate the pressure it exerts on the ground.
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