Chapter 6 Physics Homework Answers

 

Physics: Principles and Problems 

Solutions Manual

115

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6

Motion in Two Dimensions

CHAPTER

Practice Problems

6.1

Projectile Motionpages

147–152

page 1501.

 A stone is thrown horizontally at a speed of 5.0 m/s from the top of a cliff that is78.4 m high.

a.

How long does it take the stone to reachthe bottom of the cliff?

Since

0,

 y 



12

gt 

2

becomes



12

gt 

2

or

 

2

g y 

  

 

(92.)8(

  

07m8/.s4

  

2

m)

  

4.00 s

b.

How far from the base of the cliff doesthe stone hit the ground?

(5.0 m/s)(4.00 s)

2.0

10

1

m

c.

 What are the horizontal and verticalcomponents of the stone’s velocity just before it hits the ground?

5.0 m/s.This is the same as the initial horizontal speed because theacceleration of gravity influencesonly the vertical motion.For the vertical component,use

i

gt 

with

and

i

,the initial vertical component of velocity,zero.At

4.00 s

gt 

(9.80 m/s

2

)(4.0 s)

39.2 m/s

2.

Lucy and her friend are working at anassembly plant making wooden toy giraffes. At the end of the line, the giraffesgo horizontally off the edge of the conveyor belt and fall into a box below. If the box is0.6 m below the level of the conveyor belt and 0.4 m away from it, what must be thehorizontal velocity of giraffes as they leavethe conveyor belt?

 

2

  

so

 

2

  



1 m/s

3.

 You are visiting a friend from elementary school who now lives in a small town. Onelocal amusement is the ice-cream parlor, where Stan, the short-order cook, slides hiscompleted ice-cream sundaes down thecounter at a constant speed of 2.0 m/s tothe servers. (The counter is kept very wellpolished for this purpose.) If the serverscatch the sundaes 7.0 cm from the edge of the counter, how far do they fall from theedge of the counter to the point at whichthe servers catch them?

;

v x 



gt 

2



v x 

2



(9.80 m/s

2

)

02..007m0/ms

2

0.0060 m or 0.60 cm

1

21

21

20.4m

  

 

(

92.8)(0

  

m0./6s

2

  

m)

 

Правое запястье в гипсе. На вид за шестьдесят, может быть, около семидесяти. Белоснежные волосы аккуратно зачесаны набок, в центре лба темно-красный рубец, тянущийся к правому глазу. Ничего себе маленькая шишка, - подумал Беккер, вспомнив слова лейтенанта. Посмотрел на пальцы старика - никакого золотого кольца.

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