Answer:
The entropy change of the air when the final state is 0.5 MPa and 227°C is 0.051 kJ/kg K
Explanation:
According the assumptions:
-air as ideal gas
-constant specific heats
The change of entropy is equal to:
Answer:
11,700Newton
Explanation:
According to Newton's second law, Force = mass × acceleration
Given mass = 65kg.
Acceleration if the car can be gotten using one of the equation of motion as shown.
v² = u²+2as
v is the final velocity = 18m/s
u is the initial velocity = 0m/s
a is the acceleration
s is the distance travelled = 0.9m
On substitution;
18² = 0²+2a(0.9)
18² = 1.8a
a = 324/1.8
a = 180m/²
Net force acting on the body = 65×180
Net force acting on the body = 11,700Newton
Answer:
a) angle θ = 53.1º, b) V = 15 i ^ m/s, a = - 9.8 j ^ m/s² c) Y = 15.9 m
Explanation:
a) In the problem they indicate that we treat the drops of water like projectiles, as they give us the time it takes to travel distance we can find the horizontal speed
Vox = X / t
Vox = 45.0 / 3.00
Vox = 15 m / s
They also indicate the speed of water 25m / s, we calculate the angle
Vox = Vo cos θ
Vo cos θ = 15
Cos θ = 15 / Vo
θ = cos⁻¹ (15 / vo) = cos⁻¹ (15/25)
θ = 53.1º
This is the elevation angle.
b. At the highest point the vertical speed must be zero (Vy = 0), the constant horizontal speed since there is no acceleration on this axis and the only acceleration acting on the body is the acceleration of gravity
V = Vox i ^ = 15 i ^ m / s
a = -g j ^ = - 9.8 j ^ m /s²
Where the negative sign indicates that the acceleration is towards the center of the earth
c. The water takes to reach the building 3 s let's calculate the height
Y = Voy t - ½ g t²
Voy = Vo sin θ
Voy = 25 sin 53.1
Voy = 20 m / s
Y = 20 3 - ½ 9.8 3²
Y = 15.9 m
It would be Mass and Time which would be the two fundamental units.
Answer:
1 work is scalar quantity
2 it si unit of work is joule
3The equation of caculate is work= Force× Displacement
1 power is scalar quantity
2 it si unit of power is watt
3 the equation of calculateis power= work \time