13. A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used?
2 answers:
Answer:
457.14 Watt
Explanation:
The information we have is:
Force:
Distance:
Time:
the formula for the power is:
where is work, and
si time.
Also, the formula for work is:
Where is the force, and
is the distance.
Substituting the formula for work into the formula for power:
substituting all the values to find the power:
the power that was used is 457.14 Watt
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Answer:
(a) Ff = 3.95N
(b) Ff = 5N
Explanation:
(a) To find the friction force you use the second Newton law:
But you take into account the applied force and the opposite friction force:
you do Ff the subject of the formula and replace the values of the parameters:
(b) In the case of a motion with constant velocity you have that there is no acceleration. Hence:
Answer:
For left = 0 N/C
For right = 0 N/C
At middle = N/C
Explanation:
Given data :-
б = C/ m²
Considering the two thin metal plates to be non conducting sheets of charges.
Electric field is given by
1) To the left of the plate
= 0 N/C.
2) To the right of them.
= 0 N/C.
3) Between them.
=
=
=
N/C