Answer:
Force = 485000 Newton.
Explanation:
Given the following data;
Mass = 485000 kg
Initial velocity = 20m/s
Final velocity = 25m/s
Time, t = 5 seconds
To find the force;
First of all, we would calculate the acceleration of the train i.e the rate of change of the velocity of the train with respect to time.
Mathematically, acceleration is given by the equation;
Where;
a is acceleration measured in
v and u is final and initial velocity respectively, measured in
t is time measured in seconds.
Substituting into the equation, we have;
Acceleration = (25 - 20)/5
Acceleration = 5/5
Acceleration = 1m/s²
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
Force = mass * acceleration
Force = 485000 * 1
Force = 485000 Newton.
Answer:
The new speed is 1230.28 m/h
Explanation:
The jet airliner moving initially at 503 mph to the east
The wind is blowing at 855 mph in a direction 52° north of east
At first let us distribute the velocity of the wind into east component
and north component
→ The east component is 855 cos(52) m/h
→ The north component is 855 sin(52) m/h
Now we have two components of velocity in the east direction
and one component of velocity in the north direction
The new speed is the resultant of the east and north components
→ The east components are 503 m/h and 855 cos(52) m/h
→ The north component is 855 sin(52) m/h
Add the components of the speeds in direction of east
→ The east component = 503 + 855 cos(52) = 1029.39 m/h
→ The north component = 855 sin(52) = 673.75 m/h
Now we can find the new speed as a resultant speed of the east and
north components
→ The new speed =
→ The new speed = 1230.28 m/h
<em>The new speed is 1230.28 m/h</em>
The Correct Answer is A.
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A
Mass is not use to calculate specific heat of substance