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Category: Physics
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Tags: embed, dsmt4, equation, gravity, acceleration, condition, centripetal, speed, tension, astronauts, second, orbit, equation dsmt4, embed equation, dsmt4 embed, dsmt4 fig, and embed, dsmt4 the, dsmt4 and, dsmt4 down, when embed, dsmt4 but, centripetal accel
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Filename: Answers to Chapter 5.doc
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Description
Physics for Bioscience
Transcript
Q5.13 I would not accept that statement for two reasons. First, to be beyond the pull of gravity, one would have to be infinitely far away from all other matter. Second, astronauts in orbit are moving in a circular path. It is the gravitational pull of Earth on the astronauts that keeps them in orbit. In the space shuttle, just above the atmosphere, gravity is only slightly weaker than at the Earths surface. Gravity does its job most clearly on an orbiting spacecraft, because the craft feels no other forces and is in free fall. P5.11(a) (b)See Figure to the right EMBED Equation.DSMT4 Adding, EMBED Equation.DSMT4 EMBED MSDraw mergeformat FIG. P5.45 P5.15 EMBED Equation.DSMT4 , EMBED Equation.DSMT4 . The string will break if the tension exceeds the weight corresponding to 25.0 kg, so EMBED Equation.DSMT4 . When the 3.00 kg mass rotates in a horizontal circle, the tension causes the centripetal acceleration, so EMBED Equation.DSMT4 . Then EMBED Equation.DSMT4 and EMBED Equation.DSMT4 or EMBED Equation.DSMT4 . FIG. P6.1 P5.17 EMBED Equation.DSMT4 since EMBED Equation.DSMT4 The force causing the centripetal acceleration is the frictional forcef. From Newtons second law EMBED Equation.DSMT4 . But the friction condition is EMBED Equation.DSMT4 i.e., EMBED Equation.DSMT4 FIG. P6.7 EMBED Equation.DSMT4 EMBED Equation.DSMT4 P5.23 EMBED Equation.DSMT4 But EMBED Equation.DSMT4 at this minimum speed condition, so EMBED Equation.DSMT4 . FIG. P6.17 P5.25 (a) EMBED Equation.DSMT4 When EMBED Equation.DSMT4 , EMBED Equation.DSMT4 and EMBED Equation.DSMT4 EMBED Equation.DSMT4 The Styrofoam falls 1.50 m at constant speed EMBED Equation.DSMT4 in 5.00 s. Thus, EMBED Equation.DSMT4 Then EMBED Equation.DSMT4 (b) At EMBED Equation.DSMT4 , EMBED Equation.DSMT4 and EMBED Equation.DSMT4 down (c) When EMBED Equation.DSMT4 , EMBED Equation.DSMT4 down P5.26 (a) EMBED Equation.DSMT4 , EMBED Equation.DSMT4 , EMBED Equation.DSMT4 EMBED Equation.DSMT4 Assuming a drag coefficient of EMBED Equation.DSMT4 for this spherical object, and taking the density of air at 20C from the endpapers, we have EMBED Equation.DSMT4 (b) EMBED Equation.DSMT4 EMBED Equation.DSMT4 iw.bCPA5pjP1mNj(Rd Bpvk6cK.O-w@Dx7neZ9OQHdeOaSa1-un_UopUQU9X,z9gOH,FiSL-7-w_uMjYjkfDEhd)TT GQV71zsxns rjdK KdIFAfFMY9wvsg wRnFzbq,KDuw g R 8 j
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