Answer:
0.81 m/s^2
Explanation:
A child rides a bicycle from rest
The child reaches a velocity of 3.8m/s
The time is 4.7 secs
Therefore the acceleration can be calculated as follows
v= u + at
3.8= 0 + a(4.7)
3.8= 0 + 4.7a
3.8-0= 4.7a
3.8= 4.7a
a= 3.8/4.7
= 0.81 m/s^2
Hence the acceleration is 0.81 m/s^2
Here we can say that number of moles as well as pressure will remain same for the balloon
so here we can say by ideal gas equation

so here for constant pressure and constant number of moles we have


now by rearranging the equation we have


so final volume will be 0.89 liter
Answer:
a.=4.78 m/s2
b. the thread will remain vertical
Explanation:
a.
For jet acceleration as you know,
Weight due to gravity given as
F= w =mg
and body movement with acceleration as
F= ma





Its acceleration of plane
b.
For planes attaining constant velocity
a = 0 and tan∅ = 0
so Ф = 0
hence the thread will be remain vertical