An elevator and its load have a combined mass of 1650 kg. Find the tension in the supporting cable when the elevator, originally
moving downward at 11 m/s, is brought to rest with constant acceleration in a distance of 41 m.
1 answer:
Answer:
Tension in the supporting cable is = 4,866 N ≅4.9 KN
Explanation:
First of all, we need to understand that tension is a force, so the motion law
F = Ma applies perfectly.
From Newtons third law of motion, action and reaction are equal and opposite. This means that the force experienced by the elevator, is equal to the tension experienced by the spring.
Parameters given:
Mass of load = 1650 kg
Acceleration of load = ?
The acceleration of the load can be obtained by diving the change in velocity by the time taken. But we need to know the time taken for the motion to 41 m.
Time taken = distance covered / velocity
= = 3.73 seconds
∴Acceleration = ( initial velocity - final velocity )/ time taken
Note: Final velocity is = 0 since the body came to a rest.
Acceleration = = 2.95m/
Force acting on the cable = mass of elevator × acceleration of elevator
= 1650 × 2.95 = 4869.5 kg ≅ 4.9 KN
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Answer:
The required acceleration is m/s²
Explanation:
Given
- Force F = 250 N
- Mass m = 221 kg
To determine
Acceleration a = ?
We know that acceleration is produced when a force is applied to a body.
The acceleration can be determined using the formula
where
- F is the force
- m is the mass
- a is the acceleration
now substituting F = 250 , and m = 221 in the formula
switch the equation
Divide both sides by 221
simplify
m/s²
Therefore, the required acceleration is m/s²
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