A sound wave coming from a tuba has a wavelength of 1.10 m and travels to your ears at a speed of 253 m/s. What is the frequency of the sound you hear?
a. 278 Hz
b. 1/278 Hz
c. 230 Hz
d. 1/230 Hz
e. 252 Hz
c
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What is the maximum kinetic energy of a 2.00-kg mass moving with simple harmonic motion with an amplitude 5.00 cm and period 0.300 s?
A) 1.10 J B) 0.444 J C) 0.222 J D) 0.174 J E) 0.0278 J
A skilled ballet dancer appears to move in a seemingly floating motion, seeming to defy gravity in a grand jeté. Part of how this is done is by:
a. moving her arms and legs to keep her center of mass at the about same height above the ground. b. moving her arms and legs to cause her center of mass to move upward while falling. c. being supported from the ceiling by a hidden cable not visible to the audience. d. moving her arms and legs so that as her center of mass moves, she keeps her head at the same height above the ground. e. moving her arms and legs so that her center of mass is kept from accelerating downward.
The total force on an object is zero. The angular momentum of the object
A) is zero. B) may be changing. C) can only be changing direction. D) is constant. E) can only be changing magnitude.
One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s . How far is 1 light-year?
A) 1.08 billion km (1,080,000,000, or 1.08 × 109 km) B) 300 thousand km (300,000, or 3 × 105 km) C) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km) D) 18 million km (18,000,000, or 1.8 × 107 km)