How do you find magnitude of the force of tension if the net force in the x direction of 98 n?

Before you can do that, you also need to know the net force in the y-direction, AND the direction of the string.

B. 139

Explanation:

in physics zero. in muscle fatigue could be high

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me