5. How are electromagnetic waves similar to ocean waves?.
1 answer:
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Answer:
20 N
Explanation:
There are two forces acting on the box:
- The force of push, F, forward, of magnitude F = 20 N
- The force of friction, , backward
So, the equation of motion for the box is
where
m = 5.0 kg is the mass of the box
a is its acceleration
The box is sliding at constant velocity: this means that its acceleration is zero
a = 0
So, the equation becomes
Therefore, we can find the magnitude of the force of friction:
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.