According to recent typical test data, a Ford Focus travels 0.210 mi in 19.4 s , starting from rest. The same car, when braking from 58.5 mph on dry pavement, stops in 148 ft . Assume constant acceleration in each part of its motion, but not necessarily the same acceleration when slowing down as when speeding up.

a. Find this car's acceleration while braking and while speeding up.
b. If its acceleration is constant while speeding up, how fast (in mph) will the car be traveling after 0.250 mi of acceleration?
c. How long does it take the car to stop while braking from 60.0 mph?

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

d. platinum would have the greatest temperature increase because it has the lowest specific heat.