One game at the amusement park has you push a puck up a long, frictionless ramp. you win a stuffed animal if the puck, at its highest point, comes to within 10 cm of the end of the ramp without going off. you give the puck a push, releasing it with a speed of 5.0 m/s when it is 8.50 m from the end of the ramp. the puck's speed after traveling 3.0 m is 4.0 m/s.

Explanation:

Given

initial speed(u)=5 m/s

Final speed(v)=4 m/s

Distance traveled=3 m

using equation of motion

after this its final velocity will be zero

s=5.33 m

Total distance=3+5.33=8.33 m

Thus he will not be able to win the game

b) phosphorus pentoxide

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