T<span>he phenomenon of </span>static electricity<span> requires a separation of </span>positive<span> and </span>negative<span> charges. When two materials are in contact, electrons may move from one material to the other, which leaves an excess of </span>positive<span>charge on one material, and an equal </span>negative<span> charge on the other.</span>
Answer:
the angular acceleration of the gate is approximately 1.61 ![\frac{rad}{s^2}](https://tex.z-dn.net/?f=%5Cfrac%7Brad%7D%7Bs%5E2%7D)
Explanation:
Recall the formula that connects the net torque with the moment of inertia of a rotating object about its axis of rotation, and the angular acceleration (similar to Newton's second law with net force, mass, and linear acceleration):
![\sum \tau_1=I\,\alpha](https://tex.z-dn.net/?f=%5Csum%20%5Ctau_1%3DI%5C%2C%5Calpha)
In our case, both forces contribute to the same direction of torque, so we can add their torques up and get the net torque on the gate:
![\tau_{net}=(20*2+30*3.5) \,N\,m=145\,\,N\,m](https://tex.z-dn.net/?f=%5Ctau_%7Bnet%7D%3D%2820%2A2%2B30%2A3.5%29%20%5C%2CN%5C%2Cm%3D145%5C%2C%5C%2CN%5C%2Cm)
Now we use this value to obtain the angular acceleration by using the given moment of inertia of the rotating gate:
![\sum \tau_1=I\,\alpha\\145\,\,N\.m=(90\,\,kg\,m^2)\,\alpha\\\alpha= \frac{145}{90} \frac{rad}{s^2} = 1.61\, \frac{rad}{s^2}](https://tex.z-dn.net/?f=%5Csum%20%5Ctau_1%3DI%5C%2C%5Calpha%5C%5C145%5C%2C%5C%2CN%5C.m%3D%2890%5C%2C%5C%2Ckg%5C%2Cm%5E2%29%5C%2C%5Calpha%5C%5C%5Calpha%3D%20%5Cfrac%7B145%7D%7B90%7D%20%5Cfrac%7Brad%7D%7Bs%5E2%7D%20%3D%201.61%5C%2C%20%5Cfrac%7Brad%7D%7Bs%5E2%7D)
Answer:
Explanation:
When objects collide, energy can be transferred from one object to another, thereby changing their motion. In such collisions, some energy is typically also transferred to the surrounding air; as a result, the air gets heated and sound is produced.
Answer:
the current of 12 ohm is 2A