Suppose you go to Six Flags again, but now you decide to go on the Wonder Woman Coaster ride instead of the Superman. The maximum height of this ride is 37m. You’re released from rest from the top of the ride, and you notice that your speed varies as the ride progresses. Calculate: 1. Your speed when you’re at a height of 30m.
2. The maximum speed you have throughout the ride.
3. The height at which your speed is half the maximum speed.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

+15-35=-20

going in opposite directions