The normal force would be the opposing and equal force to gravity ... that is why the box isn't floating or going through the ground ... this is Newton's third law of motion
Answer:
Number the switches 1, 2 and 3.
Switch on number 1 for 1 minute, then switch it off. Switch on number 2. Go upstairs...
The light that is on is connected to switch 2. The light that is off and warm is connected to switch 1. The light that is off and cold is connected to switch 3!!
Explanation:
Answer:
10 V
Explanation:
The potential difference between two points is the amount of work required to carry a unit charge from one point to the other point. This would result in a potential difference between this two points.
The difference between the potential across two points B and A is ![V_{BA}=V_B-V_A](https://tex.z-dn.net/?f=V_%7BBA%7D%3DV_B-V_A)
From the image attached:
![V_B-V_A=10-10I+20\\\\But\ I = 2A,hence:\\\\V_B-V_A=10-10(2)+20\\\\V_B-V_A=10-20+20\\\\V_B-V_A=10\ V](https://tex.z-dn.net/?f=V_B-V_A%3D10-10I%2B20%5C%5C%5C%5CBut%5C%20I%20%3D%202A%2Chence%3A%5C%5C%5C%5CV_B-V_A%3D10-10%282%29%2B20%5C%5C%5C%5CV_B-V_A%3D10-20%2B20%5C%5C%5C%5CV_B-V_A%3D10%5C%20V)