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Chapter 1: 45P (page 1)
A 100 kgblock is pulled at a constant speed of 5.0 m/sacross a horizontal floor by an applied force of 122 Ndirectedabove the horizontal. What is the rate at which the force does work on the block?
The rate of doing work on the block is, .
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In purchasing food for a political rally, you erroneously order shucked medium-size Pacific oysters (which come 8 to 12 per U.S. pint) instead of shucked medium-size Atlantic oysters (which come 26 to 38 per U.S. pint). The filled oyster container shipped to you has the interior measure of,and a U.S. pint is equivalent to 0.4732 liter . By how many oysters is the order short of your anticipated count?
The force on a particle is directed along an x axis and given by. Find the work done by the force in moving the particle from by (a) plotting and measuring the work from the graph and (b) integrating.
An astronomical unit (AU) is equal to the average distance from Earth to the Sun, about . A parsec (pc) is the distance at which a length of 1 AU would subtend an angle of exactly 1 second of arc (Fig. 1-8). A light-year (ly) is the distance that light, traveling through a vacuum with a speed of , would cover in 1.0 year . Express the Earth – Sun distance in (a) parsecs and (b) light-years.
A standard interior staircase has steps each with a rise (height) of 19 cm and a run (horizontal depth) of 23 cm. Research suggests that the stairs would be safer for descent if the run were, instead, 28 cm. For a particular staircase of total height 4.57 m, how much farther into the room would the staircase extend if this change in run were made?
Two waves,
travel along a stretched string. (a) Plot the resultant wave as a function of tfor,is the wavelength. The graphs should extend from t = 0to a little over one period. (b) The resultant wave is the superposition of a standing wave and a traveling wave. In which direction does the traveling wave move? (c) How can you change the original waves so the resultant wave is the superposition of standing and traveling waves with the same amplitudes as before but with the traveling wave moving in the opposite direction? Next, use your graphs to find the place at which the oscillation amplitude is (d) maximum and (e) minimum. (f) How is the maximum amplitude related to the amplitudes of the original two waves? (g) How is the minimum amplitude related to the amplitudes of the original two waves?
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