Blowing gently across the top of a soda pop bottle gives you a musical note at a certain fundamental frequency. This is most similar to
A. making a guitar string resonate at its fundamental.
B. a wind chime.
C. an organ pipe.
D. a telephone.
Answer: C
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The components of polyester are _________toxic than epoxy.
Fill in the blank(s) with the appropriate word(s).
A mass of 385 g hangs from one end of a string that goes over a pulley with a moment of inertia of 0.0125 kg?m2 and a radius of 15.0 cm. A mass of 710 g hangs from the other end
When the masses are released, the larger mass accelerates downward, the lighter mass accelerates upward, and the pulley turns without the string slipping on the pulley. What is the tension in the string on the side of the 710-g mass? A) 9.77 N B) 6.87 N C) 5.59 N D) 4.41 N E) 3.68 N
A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What average force of air friction was exerted on the stone as it fell?
A) 4.1 N B) 2.9 N C) 0.13 kN D) 7.2 N E) 1.2 N
Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
A. each body exerts an equal and opposite force on the other during the collision. B. the forces act during equal time intervals. C. the law of conservation of momentum for an isolated system is a vector equation. D. of all of the above. E. of only (a) and (b) above.