Answer:
When the same charge spreads in the foil of the electroscope then there is a repulsion between the similarly charged foil.
Explanation:
An electroscope is a device which has metallic foil inside a sealed glass flask preventing in form external environmental disturbances. There is a ball connected to the foil via a conductor.
When the ball is touched by a charged body then the charge is conducted from the body to the ball via conductor to the foils of the electroscope. When the same charge spreads in the foil of the electroscope then there is a repulsion between the similarly charged foil.
When the charge is supplied to any metallic body then it spreads over the surface of the metal so as to minimize the force of repulsion between the similar charges.
Work is force times distance
pressure is force over area
hence pressure times volume will give us force times distance aka work
1.1 atm is 111.458 kPa
si units
111.458 kPa times 2.3 L equals 256.35 J
The power transferred by the motor is equal to the product between the current and the voltage:
![P_{in}=VI=(7.2 V)(0.37 A)=2.67 W](https://tex.z-dn.net/?f=P_%7Bin%7D%3DVI%3D%287.2%20V%29%280.37%20A%29%3D2.67%20W)
However, the power used by the winch system is less than this value. In fact, the work done is equal to the weight of the load times the distance through which it has been lifted:
![W=Fd=(30 N)(2.5 m)=75 J](https://tex.z-dn.net/?f=W%3DFd%3D%2830%20N%29%282.5%20m%29%3D75%20J)
And the power used by the system is the work done divided by the time taken:
![P_{out}= \frac{W}{t}= \frac{75 J}{90 s}=0.83 W](https://tex.z-dn.net/?f=P_%7Bout%7D%3D%20%5Cfrac%7BW%7D%7Bt%7D%3D%20%5Cfrac%7B75%20J%7D%7B90%20s%7D%3D0.83%20W%20%20)
Therefore, the efficiency of the system is given by the ratio between the useful power and the power in input:
Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy.