I think its 6.635 not very sure, sorry if it doesn't help.
A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
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Answer:
t = 6 minutes
Explanation:
Given that,
Force,
Initial speed of the train, u = 0
Final speed of the train, v = 80 km/h = 22.22 m/s
The mass of the train, 
We need to find the time taken by the train to come to rest. We know that,
F = ma

or
t = 6 minutes (approx)
So, the required time is equal to 6 minutes.
Answer:
9.93 MPa
Explanation:
Given:
- mass of the man = 68.4 kg
- Deflection dx = 5.2 cm
- thickness of plank t = 2.0 cm
- width of plank w = 13.0 cm
- Length subtended L = 2.0 m
Find:
Shear Modulus of Elasticity S :
S = shear stress / shear strain
Shear stress = F / A
Shear stress = 68.4*9.81 / 0.02*0.13
Shear stress = 258078.4615 Pa
Shear strain = dx / L
Shear Strain = 0.052 / 2
Shear Strain = 0.026
Hence,
S = 258078.4615 / 0.026
S = 9.93 MPa
Answer:
(B) 15 N.m
Explanation:
The deceleration of the wheel is first found by using the following formula:

where,
α = angular acceleration = ?
ωf = final angular speed = 0 rad/s
ωi = initial angular speed = 12 rad/s
t = time = 0.4 s
Therefore,

here, the negative sign shows deceleration.
Now, we find the torque responsible for this deceleration:

where,
τ = torque = ?
I = rotational inertia = 0.5 kg.m²
Therefore,

τ = 15 N.m
Therefore, the correct answer is:
<u>(B) 15 N.m</u>