Answer:
This is the complete answer and step by step explanation.
Given:
a = 3m/s
m = 85 kg
Unknown:
The Kinetic energy of the man jogging
Formula and solution:
KE = 1/2 mv²
KE = 1/2(85 kg)(3 m/s)²
KE = (42.5 kg)(9 m²/s²)
Final Answer:
KE = 382.5 kg.m²/s² or simplify as 382.5 J is the kinetic energy of man jogging
Answer:
final temperature is 364.32 K
mass of air is 0.5423 kg
Explanation:
given data
pressure p1 = 380 kPa
volume v1 = 0.120 m³
temperature = 20°C = 20 + 273 = 293 K
pressure p2 = 3450 kPa
volume v2 = 5% increase
to find out
final temperature and the mass
solution
we consider here ideal gas
so equation is
p1v1 / t1 = p2v2/t2
put here all value and find t2
and v2 is = 0.120 ( 1 + 0.05) = 0.126 m³
so
t2 = p2v2/ p1v1 × t1
t2 = (450 × 0.126) / (380 × 0.120) × 293
t2 = 364.32 K
so final temperature is 364.32 K
and
mass = p2v2 / Rt2
here R gas constant is 0.287 kJ/kg.K
so
mass = (450 × 0.126) / (0.287 × 364.32 )
mass = 0.5423
so mass of air is 0.5423 kg
Answer:
A hydrometer is an instrument used to determine specific gravity
The answer is definitely A
