Point charge A with a charge of +4.00 μC is located at the origin. Point charge B with a charge of +7.00 μC is located on the x
2 answers:
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The mass is missing. The mass of the elevator is 1650 kg.
Answer:
The tension in the cable is 19387.5 N.
Explanation:
Given:
Initial velocity of the elevator (u) = 0 m/s
Acceleration in the upward direction (a) = 1.95 m/s²
Time taken by the elevator (t) = 2.15 s
Mass of the elevator and persons (m) = 1650 kg
Let the tension in the cable wire be 'T' Newtons.
Now, there are 2 forces acting in the vertical direction. One is tension in the upward direction and the other the weight of the elevator in the downward direction.
As the elevator is accelerating upward, the net force acts in the upward direction.
So, net force on the elevator is given as:
Now, from Newton's second law, net force equals mass times acceleration.
Plug in the given values and solve for 'T'. This gives,
Therefore, the tension in the cable is 19387.5 N.
Answer:
35.7m
Explanation:
Given parameters:
Mass of rock = 25kg
Time of fall = 2.7s
Unknown:
Height of the building = ?
Solution:
To solve this problem, we will use one of the motion equations;
S = ut + gt²
S is the height
u is the initial velocity = 0m/s
t is the time
g is the acceleration due to gravity
S = (0 x 2.7) + x 9.8 x 2.7² = 35.7m