How Do You Calculate Tension in a Cable and Determine Mass with Given Variables?

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To calculate tension in a cable, apply Newton's second law, using the formula T = m(g + a) for an elevator accelerating upwards. For the parachutist problem, use kinematic equations to determine acceleration, factoring in initial speed and air resistance. The mass can then be calculated by rearranging the forces acting on the parachutist. Presenting the entire problem context is crucial for accurate calculations. Understanding these principles is essential for solving both scenarios effectively.
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1.the mass and acceleration is given and asks for tension in cable. What is a formula i could use.
2.in another question initial speed, air resistance, time and speed is given, what is a formula i could use for this question to solve for mass.
 
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1. Look up Newton's laws of motion.

2. It would be great to present the whole problem.
 
1. An elevator of mass of 900 kg accelerates upwads at 3 m/s^2. What is the tension in the cable where it is attatched to the elevator?

2. A parachutist jumps out of an airplane at an initial speed of 2m/s down. There is a force of air resistance equivalent to 305 N. Determine the mass of the parachutist if it takes 3 seconds to travel 30 m down.

So his speed is 10 m/s. And i dnt know anything else:frown:
 
As mentioned above, look up Newton's second law of motion. Part 1 is very simple. Part 2 includes a kinematical equation, i.e. the equation of displacement, from which you will obtain the acceleration.
 
ok, thank you , appreciate it
 

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