Answer:
25N
Explanation:
Given parameters:
Power of the motor = 125W
Average speed = 5m/s
Unknown:
Force supplied to the motor = ?
Solution:
Work done is the force applied to move a body through a particular distance;
Work done = Force x distance
Also,
Work done = Power x time
So;
Force x distance = Power x time
since force is the unknown;
Force =
Speed =
Force =
Now solve;
Force = = 25N
Answer:
The time interval is
Explanation:
From the question we are told that
The angular acceleration is
The time taken is
The angular displacement is
The angular displacement can be represented by the second equation of motion as shown below
where is the initial velocity at the start of the 4 second interval
So substituting values
=>
Now considering this motion starting from the start point (that is rest ) we have
Where is the angular velocity at rest which is zero and
is the angular velocity after 4.0 second which is calculated as 12 rad/s s
=>
Answer:
The value is
Explanation:
From the question we are told that
The weight of the horizontal solid disk is
The radius of the horizontal solid disk is
The force applied by the child is
The time considered is
Generally the mass of the horizontal solid disk is mathematically represented as
=>
=>
Generally the moment of inertia of the horizontal solid disk is mathematically represented as
=>
=>
Generally the net torque experienced by the horizontal solid disk is mathematically represented as
=>
=>
=>
Gnerally from kinematic equation we have that
Here is the initial angular velocity velocity of the horizontal solid disk which is
So
=>
Generally the kinetic energy is mathematically represented as
=>
=>