State Kepler's second law of planetary motion
What will be an ideal response?
Each planet moves so that an imaginary line drawn from the Sun to the planet sweeps out equal areas in equal periods of time.
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A 30.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the fifth mode?
A. 30.3 cm B. 26.7 cm C. 21.2 cm D. 17.1 cm E. 12.3 cm
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 16 N b. 17 N c. 21 N d. 11 N e. 25 N
Olbers' paradox asks
A. Why isn't the night sky bright as day? B. How can the Universe be younger than some of the stars in it? C. If dark matter is dark, how can we ever see it? D. Which is the simplest cosmological model?
When a cannon is fired, it recoils as the cannonball is set in motion. The cannon and cannonball ideally acquire equal
A) but opposite amounts of momentum. B) amounts of kinetic energy. C) both of these D) neither of these