Beats: Two taut strings of identical mass and length are stretched with their ends fixed, but the tension in one string is 1.10 times greater than in the other. Waves on the string with the lower tension propagate at 35.2 m/s. The fundamental frequency of that string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency?
A. 11.0 Hz
B. 9.00 Hz
C. 13.7 Hz
D. 12.6 Hz
E. 17.1 Hz
Answer: D
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Molecular Speeds: The absolute temperature of an ideal gas is directly proportional to which of the following quantities?
A. the average speed of its molecules B. the average momentum of its molecules C. the average kinetic energy of its molecules D. the mass of its molecules E. It is proportional to all of these quantities.
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the frequency of the rotational motion is
A. 4.00 Hz. B. 3.67 Hz. C. 3.18 Hz. D. 2.83 Hz. E. 2.15 Hz.
Most ancient cultures believed that the Earth was
A) spherical and moving through space B) flat and moving through space C) spherical and motionless D) flat and motionless
Suggest why people once washed their hands with ashes
A) The ashes act as a base and reacts with skin oils to produce solutions of soap. B) The ashes act as an acid and reacts with the skin oils to produce soap. C) The oils on the skin act as a base and reacts with the ashes to produce soap. D) After being burnt in the fire, the acids and bases of the log are neutralized, making it a gentle material to use on the hands.