A ball of mass 500g is dropped from rest 2m above the ground. When it reaches the ground it is travelling at 5m/s. How much energy has been dissipated?
Initial energy (Gravitational Potential): E = mgh = 0.5 x 9.81 x 2 = 9.81J Final energy (Kinetic): E = mv2/2 = (0.5 x 52)/2 = 6.25J Energy lost = 9.81 - 6.25 = 3.56J
GB
Related Physics GCSE answers
All answers ▸Describe how the control rods in a nuclear reactor are used to regulate nuclear fission in a nuclear reactor.
Discuss how X-rays and Ultrasound can be used for medical purposes, including their advantages and disadvantages.
A roller coaster car starts stationary at the top of a downwards slope. At the bottom of the slope, it has a speed of 30m/s. Use the conservation of energy to find the vertical height of the slope. (Use g=10 m/s^2)
How much thermal energy does a 1 kg steel block with a specific heat capacity of 450 J/kg°C lose when it cools from 400°C to 60°C?