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Chapter 1: Q11-25E (page 1)
A circular steel wire 2.00 m long must stretch no more than 0.25 cm when a tensile force of 700N is applied to each end of the wire. What minimum diameter is required for the wire?
Minimum diameter is d = 1.9mm
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A circular racetrack has a radius of 500 m. What is the displacement of a bicyclist when she travels around the track from the north side to the south side? When she makes one complete circle around the track? Explain.
A physics professor leaves her house and walks along the sidewalk toward campus. After 5 min, it starts to rain, and she returns home. Her distance from her house as a function of time is shown in Fig. E2.10 At which of the labeled points is her velocity (a) zero? (b) constant and positive? (c) constant and negative? (d) increasing in magnitude? (e) decreasing in magnitude?
In the methane molecule, , each hydrogen atom is at a corner of a regular tetrahedron with the carbon atom at the center. In coordinates for which one of the bonds is in the direction of role="math" localid="1655792646877" , an adjacent bond is in thedirection. Calculate the angle between these two bonds.
On a training flight, a student pilot flies from Lincoln, Nebraska, to Clarinda, Iowa, next to St. Joseph, Missouri, and then to Manhattan, Kansas
(Fig. P1.66). The directions are shown relative to north: is north, is east, is south, and is west. Use the method of components to find (a) the distance she has to fly from Manhattan to get back to Lincoln, and (b) the direction (relative to north) she must fly to get there. Illustrate your solutions with a vector diagram.
In an experiment, a shearwater (a seabird) was taken from its nest, flown 5150 km away, and released. The bird found its way back to its nest 13.5 days after release. If we place the origin at the nest and extend the +x-axis to the release point, what was the bird鈥檚 average velocity in (a) for the return flight and (b) for the whole episode, from leaving the nest to returning?
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