Answer:
1. 571.43m/s
2. 142.9m and 342.9m
Explanation:
1.Take the difference in time.
1.2-0.7=0.7 seconds
Take the distance between them and divide with differnce in time.
400÷0.7=571.43 seconds.
2.Take the time of the two men and divide by two.
0.5÷2= 0.25 secs
1.2÷2= 0.6 secs
multiply each with the velocity.
0.25×571.43=142.9m
0.6×571.43=342.9m
C is the correct answer urwelcom
Since there is constant pressure, you can use Charles's Law:
V1/T1 = V2/T2
10L/280K = 20L/T
0.0357 = 20/ T
T = 20/0.0357
T = 560K which is the new temperature
Answer:

Explanation:
As the buoyant force is proportional to the length of which the wood is submerged in water, we can model the buoyant force as a spring force and the bobbing wood is a simple harmonic motion described as A cos (ωt + φ) where

where k (N/m) is the "spring" buoyant constant and m is the mass of wood
The buoyant force is basically the weight of water displaced by the submerged wood, which is the gravity acting on the cylindrical volume

Since the cylindrical has a form of AL where A is the base area and L is the length submerged

As L can be treated as the spring "stretched/compressed" length, the rest is k:


Therefore

Thanks for points...
But can you type this question.. As it becomes hard to answer if it's in the picture..