Arsenic in period 4 group 5.
Answer:
Explanation:
Given data
Mass m=120.0 kg
Coefficient of static friction
The coefficient of sliding friction
For Part (a) Maximum force
According to Newtons second law the net force aced on the body is given by
The friction force is given by
Conclude that
For Part (b) Acceleration
The acceleration due to dynamic friction is given by:
The dynamic friction is given by:
So the acceleration given by
Answer:
Explanation:
Given that,
Initial speed of a body, u = 0
Final speed of the body, v = 20 m/s
Time, t = 5 s
We need to find the acceleration of the body. We know that the acceleration of an object is equal to the rate of change of velocity divided by time taken. So,
So, the body's acceleration is equal to .
Answer:
Explanation:
From the information given:
The diameter of the cylindrical heater (d) = 1 cm
The length of the cylindrical heater (l) = 0.25 m
The ambient air temperature = 25° C= (273+25)K = 298 K
The convective heat transfer coefficient (h) = 25 W/m² °C
The electric input Q = 5W
As stated in the question that if radiation is being neglected:-
Let also assume that;
the heat transfer takes place at a steady-state
1-D flow takes place
No external heat generation; &
No force convection takes place;
Then; the heat transfer through the convection can be calculated as:
By solving the above calculation:
T ( surface temperature of the heater) = 50.46° C 122.83° F
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