Problem Set 2 Ch.3-Falling Objects PHY 110 For all questions, nsglest air rssist
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Problem Set 2 Ch.3-Falling Objects PHY 110 For all questions, nsglest air rssistancs.and fristion Neglecting friction, If a Cadillac and Volkswagen stant rolling down a bill geer bott ) before the Volkswagen. ) after the Volkswagen the heavier Cadillac will get to the at the same time as the Volkswagen. 2. The value for the acceleration due to gravity and its unit are 3. In a laboratory on Earth, all the air is pumped from a large tube (to remove air A feather and a steel ball released from ) Both objects float weightless inside the tube. ) Both objects fall and hit the botiom at the same time. ) The feather falls and hits the bottom before the steel ball. ) The steel ball falls and hits the bottom before the feather. are simultancously released from rest inside the tube What happens 4. The graph of velocity vs, time of an object falling in gravity is characterized by curve A or B in the plot? velocity OA OB Does the velocity increase at O a constant rate, i.e. with constant acceleration O an increasing rate, i.e. with increasing acceleration. time 5·The graph of distance vs. time of an object falling in gravity is characterized by curve A or curve B in the plot? ditance A OA OB Explain how the change in velocity affects the rate at which the distance increases: (1-2 sentences) time What is its speed after it has fallen for 5 seconds? (g-9.8 m/s') ) 49 m/s ) 49 m/s O 9.8 m/s ( 98 m/s 6. An object is falling from atop a building Show calculation: 7. What is its speed after it has fallen for 10 seconds? (g-9.8 m/s) ) 49 m/s. ) 49 m/s?. ( 9.8 m/s ) 98 m/s Show calculation:Explanation / Answer
1.
c. at the same time as the volkswagon
parallel to the slope , the acceleration does not depend on the mass. hence both experience the same acceleration and hence travel the slope length in same time.
2.
g = 9.8 unit: m/s2
3.
Both objects fall and it the bottom at the same time.
in absense of air resistance both experience same acceleration due to gravity irrespective of their mass. hence they travel the vertical height in same amount of time.
4.
A
velocity increase at constant rate
5.
B
6.
speed at any time is given as
Vf = Vo + a t
Given that : Vo = 0 , a = 9.8 , t = 5 sec
Vf = 0 + (9.8 x 5)
Vf = 49 m/s
7.
speed at any time is given as
Vf = Vo + a t
Given that : Vo = 0 , a = 9.8 , t = 10 sec
Vf = 0 + (9.8 x 10)
Vf = 98 m/s
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