# Question: 2 using eq 411 in which energy is in joules...

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2. Using Eq. 4.11 in which energy is in Joules when m is in kg, r is meters, and ω is angular velocity in radians/second (2π radians/revolution), determine the energy stored in each of the following flywheel systems. a. Bicycle wheel, 1 kg, 0.7m diameter, k = 1 when you are riding along at 5 m/s (11.2 mph). 1/2(k*m*r *angular velocity) r is squared angular velocity squared

b. A 100 kg, 0.3-m diameter flywheel disk (k = 0.5) spinning at 30,000 rpm is to be used as small home photovoltaic storage system. How many kWh of energy will it store (1 kWh = 3600 kJ)?