A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?
a. 21 W
b. 11 W
c. 5.4 W
d. 2.2 W
e. 1.1 W
d
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The four tires of an automobile are inflated to a gauge pressure of 2.0 × 105 N/m2 (29 PSI). Each of the four tires has an area of 0.024 m2 that is in contact with the ground. Determine the weight of the auto.
What will be an ideal response?
Angela claims that she wears a cylindrical-shaped hollow gold bracelet because it expands less than a solid one with a change in temperature. Clarissa claims that a cylindrical-shaped solid gold bracelet expands less than a hollow one. Which one, if either, is correct?
a. Angela, because the bracelet expands outward on its outer surface and inward on its inner surface. b. Clarissa, because the bracelet expands outward on its outer surface and inward on its inner surface. c. Angela, because the inner circumference does not change, but the outer circumference expands. d. Clarissa, because the inner circumference does not change, but the outer circumference expands. e. Neither, because both the inner and outer circumferences increase in length.
What is meant by the wavelength of light? By its frequency? Explain how they are related to each other
What will be an ideal response?
Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the mid-points of the longer sides and is parallel to the shorter sides?
A. 2.7 kg?m2 B. 3.6 kg?m2 C. 3.1 kg?m2 D. 4.1 kg?m2 E. 1.6 kg?m2