The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. neglect nonconservative forces, such as friction and air resistance, and find the height h of the highest point reached by the skateboarder on the right side of the ramp.

1.5 m

Explanation:

Using the law of conservation of energy

Gain in potential energy by the skateboarder=  Loss in kinetic energy by the skateboarder

PE=KE where KE represent potential energy, PE represent potential energy

where m is mass of skateboarder and v is velocity of skateboarder

PE=mgh where m is the mass of skateboarder, g is acceleration due to gravity which in this case is taken as and h is the highest point reached by the skateboarder. Equating PE=KE we have

and since m are on both LHS and LHS, the cancel

} and making h the subject of the above formula

Substituting v with 5.4 m/s and g as we obtain

Rounded off, h=1.5 m

the force on the thing and the distance the force moves the thing

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