The african bombardier beetle stenaptinus insignis can emit a jet of defensive spray from the moveable tip of its abdomen. the beetle's body has reservoirs of two different chemicals; when the beetle is disturbed, these chemicals are combined in a reaction chamber, producing a compound that is warmed from 20°c to 100°c by the heat of reaction. the high pressure produced allows the compound to be sprayed out at speeds up to 19m/s (68km/h), scaring away predators of all kinds. (the beetle shown in the figure is tethered to a wire fastened to its back by wax. it is responding to having its left foreleg pinched by forceps. the beetle is 2cm long.)calculate the heat of reaction of the two chemicals. assume that the specific heat capacity of the two chemicals and the spray is the same as that of water, 4.19×10³ j/kg⋅k, and that the initial temperature of the chemicals is 20°c.

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)

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