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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 falls d
1
= 420 meters in t
1
= 9.7 s before letting out his
parachute. After the chute opens, he falls an additional d
2
= 705 meters in t
2
=
114 s.
Part (a) Write an expression that describes the skydiver's average speed, v
1
during the period before letting out the chute in terms of the given
quantities.
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, v
2
, during the period after letting out the chute in terms of the given
quantities.
Expression :
V
2
= __________________________________________
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 (c) Write an expression that describes the skydiver's average speed during the entire fall, v
a
in terms of the given quantities.
Expression :
v
a
= __________________________________________
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, v
a
, in m/s.
Numeric : A numeric value is expected and not an expression.
v
a
= __________________________________________
Problem 2: A student drove to the university from her home and noted that the odometer reading of her car increased by 16.4
km. The trip took 27.3 min.
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 is 5.8 km 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| = __________________________________________