Answer:
a
Explanation:
A is the answers since pedmas
for parentheses exponents division multiplacation addition subtranction in that order
Answer:
C. The intensity of 20F signal would be higher, but the lifetime would be unchanged
Explanation:
The half live value is constant, life term of an exponentially decaying quantity, and it a property of the exponential decay equation. Half life does not decay on the initial concentration. Hence, there won't be any change in observation.
C. The intensity of 20F signal would be higher, but the lifetime would be unchanged
Propeller , turbine engine
Answer:
The final temperature is 26.96 F
Explanation:
Initial pressure = 30 lbf/in^2 = 30×1.01325/14.696 = 2.1 bar
Initial temperature = 20 F = (20 - 32)/1.8 + 273 = 266.33 K
From steam table, entropy at 2.1 bar = 7.111 kJ/kg.K
Initial enthalpy = 7.111×266.33 = 1893.9 kJ/kg
Final pressure = 60 lbf/in^2 = 60×1.01325/14.696 = 4.1 bar
From steam table, entropy at 4.1 bar = 6.889 kJ/kg.K
Work = 0.5 Btu = 0.5×1.05506 = 0.5908 kJ
Change in enthalpy (∆H) = work/mass
mass of refrigerant = 0.04 lb = 0.04×0.45359 = 0.0181 kg
∆H = 0.5908/0.0181 = 32.64 kJ/kg
H2 = H1 - ∆H = 1893.9 - 32.64 = 1861.26 kJ/kg
Final temperature = final enthalpy ÷ final entropy = 1861.26 kJ/kg ÷ 6.889 kJ/kg.K = 270.2 K = 1.8(270.2 - 273) + 32 = -5.04 + 32 = 26.96 F
Answer:
time is 2 hour and 32 min
Explanation:
given data
normal average speed = 105 km/h = (65 mi/h)
trip time takes = 1 h and 50 min = 1.83 hr
average speed with heavy traffic = 75.0 km/h = (47 mi/h )
to find out
How much longer does the trip take
solution
we know that here total distance that is express as
Total distance = Average speed × Total time ..................1
Total distance = 105 × 1.83
Total distance = 192.15 km ( distance between San Diego and Los Angeles )
and when average speed 75 km/h
time will be
time =
time =
time = 2.56 hr
so time is 2 hour and 32 min