Answer:
Explanation:
Given ; P1 = 100 kPa, T1 = 30°C, T2 = 90°C, P2 = 200 kPa, V1 = 350 m/s
From energy conservation at inlet and outlet
h1 + (1/2)v1² = h2 + (1/2)v2²
CpT1 + (1/2)v1² = CpT2 + (1/2)v2²
.718(90-30) x 103= 0.5x (350²-v2²)
velocity at the exit of a diffuser ; V2=190.63m/s
Answer: 30s, 900m
Explanation: once the break is applied, the car will decelerate and the car will come to rest.
Since the car is coming to rest, final velocity (v) equals zero.
Hence u = 60 m/s, a = - 2m/s²
Recall that v = u + at
0 = 60 +( - 2)t
2t = 60, t = 60 /2 = 30s.
To get the distance covered before the car comes to rest, we have the formulae below
v² = u² + 2as
0² = 60² + 2(-2)s
0 = 3600 - 4s
4s = 3600
s = 3600/ 4 = 900m
Answer:
Answer
Advantages of alcohol over Mercury
(a) Freezing point of alcohol is −117∘
C and hence can record very low temperature For example in Arctic and Antarctic regions temperature may fall below −80∘
C which cannot be measured by mercury thermometer because mercury freezes at−39 ∘ C
(b) The expansion of alcohol per degree rise in temperature is much more around six times more then that of mercury and hence is more sensitive
(c) it can be coloured brightly by adding some dye in it and hence is easily detectable
Answer:
<em>The specific heat capacity of something is simply the amount of heat energy required to raise 1g of that substance or object by 1°C.</em>
<em>The specific heat capacity of something is simply the amount of heat energy required to raise 1g of that substance or object by 1°C.It is given by the formula Q = mcΔT, where Q is the energy transferred (J), m is the mass of the substance (kg), c is the specific heat capacity, and ΔT is the temperature change (°C).</em>
Your answer would be B because although the Moon is gone, the sun still has a gravitational pull towards the oceans waves