The 800 kg roller coaster starts from rest at point W, which is 20 meters high. If 50,000 J of energy are "lost" to heat, how fast will the roller coaster be traveling at point X?

11.18 m/s.

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 800 kg

Height (h) = 20 m

Energy (E) = 50000 J

Velocity (v) =?

The velocity of the roller coaster can be obtained as follow:

E = ½mv²

50000 = ½ × 800 × v²

50000 = 400 × v²

Divide both side by 400

v² = 50000 / 400

v² = 125

v = √125

v = 11.18 m/s

Therefore, the velocity of the roller coaster is 11.18 m/s.

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