For this case we have that by definition, the average power is given by:

Where:
W: It is the work done
t: It's time
According to the data we have to:

So:

Answer:

There are
two things that you should remember while dealing with the "Lever Mechanical Advantage" problems:
1) The Effort Arm;
2) The Resistance Arm.
Some books label the Effort Arm as in-lever arm and the Resistance Arm as out-lever arm. (Physics Jargon that you need to remember in order to solve problems)
The Effort Arm is that "part" of the lever where the force can be applied. The Resistance Arm is where some mass is placed. In the diagram, as you can see, the mass is placed on one arm of the lever. Therefore, it is the Resistance Arm.
Now the formula for the "Mechanical Advantage(MA)" is:

Where

is the length of the Effort Arm(the subscript "e" stands for Effort), and

stands for the length of the Resistance Arm(here "r" stands for Resistance).
Plug in the values:

= 15m.

= 7m.
Therefore,

/

= 15/7 =
2.143 = MAThe correct answer is
option C(2.14).
-i
2.04 meters distance is traveled by the sled before stopping.
Mass of the sled = m
The initial speed of the sled = 2 m/s
Coefficient of kinetic friction between sled and ice = 0.100
Let the distance the sled moves before it stops be d.
Gravity = 9.8 m/ s²
Let the initial kinetic energy sled be


The work done by the frictional force is,


Work done by frictional force= Initial kinetic energy of the sled


So, the distance traveled by the sled before stopping is




Therefore, the distance traveled by the sled before stopping is 2.04 meters.
To know more about work done, refer to the below link:
brainly.com/question/13662169
#SPJ4
Answer:
5773.50269 Hz
23 A
Explanation:
= Inductance = 6 mH
= Capacitance = 5 μF
= Resistance = 3 Ω
= Maximum emf = 69 V
Resonant angular frequency is given by

The resonant angular frequency is 5773.50269 Hz
Current is given by

The current amplitude at the resonant angular frequency is 23 A