A fisherman fishing from a pier observes that the float on his line bobs up and down, taking 2.4 s to move from its highest point to its lowest point. He also estimates that the distance between adjacent wave crests is 48 m
What is the speed of the waves going past the pier? A) 1.0 m/s
B) 20 m/s
C) 10 m/s
D) 5.0 m/s
E) 120 m/s
C
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A 375-g stone hangs from a thin light string that is wrapped around the circumference of a frictionless pulley with a moment of inertia of 0.0125 kg ? m2 and a radius of 26 cm
When the stone is released, the stone accelerates downward and the pulley rotates about its axis as the string unwinds. (a) What is the magnitude of the acceleration of the stone? (b) What is the tension in the string?
Metric System: An area of 1.00 × 102 cm2 is how many square meters?
A. 1.00 m2 B. 1.00 × 102 m2 C. 1.00 × 10-2 m2 D. 1.00 × 104 m2 E. 1.00 × 10-3 m2
The electric potential inside a charged solid spherical conductor in equilibrium
a. is always zero. b. is constant and equal to its value at the surface. c. decreases from its value at the surface to a value of zero at the center. d. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. e. is equal to the charge passing through the surface per unit time divided by the resistance.
You have a set of 14 metal weights strung together by nylon fishing line at equal intervals. Each has a weight of 0.20 N. You suspend this array from the ceiling and then observe waves travel up and down by shaking it.
The wave seems to move more rapidly at the top, near weights 1-3. This is because
A. gravity is cancelled by tension, so net force is zero. B. there is more tension in the fishing line near weights 1-3 than down by weight 14. C. weight 14 is balanced by no other weight, but weight 1 is balance by 13 others below it. D. the amount of mass per centimeter is higher toward the top, near weights 1-3.