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PHYS 2050 (Fall 2016) HW Assignment #2
HW Assignment #2 Begin Date:
9/14/2016 12:00:00 AM
Due Date:
9/20/2016 11:59:00 PM
End Date:
9/20/2016 11:59:00 PM
Problem 1:A skydiver fallsd1=420meters int1=9.7s before letting out hisparachute. After the chute opens, he falls an additionald2=705meters int2=114s.Part (a)Write an expression that describes the skydiver's average speed,v1during the period before letting out the chute in terms of the givenquantities.
Expression
:
v
1
= __________________________________________
Select from the variables below to write your expression. Note that all variables may not be required.
α
,
β
,
θ
,
d
,
d
1
,
d
2
,
g
,
h
,
i
,
j
,
m
,
P
,
t
,
t
1
,
t
2
Part (b)Write an expression that describes the skydiver's average speed,v2, during the period after letting out the chute in terms of the givenquantities.Expression:V2= __________________________________________Select from the variables below to write your expression. Note that all variables may not be required.α,β,θ,d,d1,d2,g,h,i,j,m,P,t,t1,t2Part (c)Write an expression that describes the skydiver's average speed during the entire fall,vain terms of the given quantities.Expression:va= __________________________________________Select from the variables below to write your expression. Note that all variables may not be required.
Part (d)Solve for the numeric value of this speed,va, in m/s.Numeric: A numeric value is expected and not an expression.va= __________________________________________Problem 2:A student drove to the university from her home and noted that the odometer reading of her car increased by16.4km. The trip took27.3min.Part (a)What was her average speed in km/h?Numeric: A numeric value is expected and not an expression.
s
ave
= __________________________________________
Part (b)If the straightline distance from her home to the university is5.8km in a direction 25° south of east, what was the magnitude of her
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average velocity in kilometers per hour?
Numeric
: A numeric value is expected and not an expression.
v
= __________________________________________
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