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221
Sound waves are:
Answer: Sound waves are longitudinal waves with compressions and rarefactions.
Answer: Power is the rate of doing work, P = W/t.
Answer: Period T = 2pi sqrt(L/g), depends only on length and gravity.
Answer: Frequency depends on the source and does not change.
Answer: At maximum height, the object momentarily comes to rest.
Answer: Nodes are points of zero displacement in a standing wave.
Answer: Moment of inertia of a solid sphere is 2/5 MR2.
Answer: For every action, there is an equal and opposite reaction.
Answer: F = Gm1m2/r2, proportional to the product of masses.
Answer: Constructive interference occurs at integer multiples of wavelength.
Answer: Wave speed equals frequency times wavelength.
Answer: Superposition applies to all types of waves.
Answer: Zero net force means the object is in translational equilibrium.
Answer: Hooke\'s Law: F = kx, where k is spring constant and x is displacement.
Answer: Impulse has units of Newton-second, equal to change in momentum.
Answer: Speed of sound in air is approximately 343 m/s.
Answer: Waves slow down in a denser medium while frequency stays constant.
Answer: Wavelength is the distance between two consecutive identical points.
Answer: Doppler effect causes apparent frequency change due to relative motion.
Answer: h = 1/2 gt2 = 1/2 x 9.8 x 1 = 4.9 m.