C: 3000 W
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A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficienc…
A ball is held at rest on one side of a curved track. The ball is released. It rolls down one side of the track and p…
A lamp connected to a 12V supply converts energy at a rate of 36 W. How much energy will be converted in 10s?
A magnet is placed near to a solenoid that is connected to a sensitive centre-zero ammeter. The magnet is pushed towa…
A radioactive material decays by this process: Z L → Z+1M + x What is particle x?
A factory continuously produces plastic sheets. A radioactive isotope and a detector are used to check the thickness …