Work-energy theorem, conservation laws and elastic/inelastic collisions.
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Q1 · Work, Energy and Power · HARD
The luminosity of a star is 10^26 watts. How much mass does it convert to energy per second? (c = 3 × 10^8 m/s)
Q2 · Work, Energy and Power · EASY
The kinetic energy of a satellite in a circular orbit is K. Its total mechanical energy is:
Q3 · Work, Energy and Power · MEDIUM
A comet of mass m approaches the Sun from infinity with speed v. At its closest approach, its speed is 3v. The distance of closest approach in terms of G, M (Sun's mass), and v is:
Q4 · Work, Energy and Power · MEDIUM
A meteorite of mass 2 kg enters Earth's atmosphere with speed 8 km/s and slows to 2 km/s before impact. What is the magnitude of kinetic energy lost (in MJ)?
Q5 · Work, Energy and Power · MEDIUM
A meteorite of mass 500 kg strikes the Earth's surface with a velocity of 12 km/s. Assuming all its kinetic energy converts to heat, how much energy (in joules) is released?