Which best describes Lenny's error? Lenny wrote the steps he used to find the mass of an
object with 400 J of energy moving at a velocity of 8
m/s.
1. Find the square of 8 m/s, which is 64 m²/s2.
2. Divide kinetic energy, 400 J, by 64 m²/s2, which is
6.25 J per m²/s2
3. Divide 6.25 J per m²/s2 by 2 to get a mass of 3.125
kg.
O In Step 1, he should have found the square root of
400 J instead of squaring 8 m/s.
O In Step 1, he should have multiplied 8 m/s by 2
instead of squaring it.
O In Step 2, he should have divided 64 m2/s2 by 400 J
instead of dividing 400 J by 64 m2/s2.
In Step 3, he should have multiplied 6.25 J per m²/s?
by 2 instead of dividing it by 2.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

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