Using momentum balance:
The 588 N mother is on the other side of the seesaw, 2.20m away from the pivot
F1 = 588 N
x1 = 2.20 m
Two of her children sat on the other side:
F2 = 256 N
x2 = 2.00 m
F3 = 412 N
x3 = unknown
F1x1 = F2x2 + F3x3
Solve for x3:
588 * 2.2 = 256 * 2 + 412 * x3
x3 = 1.90 meters away from pivot
Kinetic energy = (1/2) x (mass) x (speed)²
8 joules = (1/2 x 1 kg) x (speed)²
Divide each side by 1/2kg : 8 joules / 0.5 kg = speed²
Take the square root of each side:
speed = √[ (8 kg-m²/sec²) / (0.5 kg) ]
= √ (8 m²/sec²)
= √8 m/s = 2.83 m/s (rounded)
Answer:
Ionic Compound
Explanation:
To identify the type of chemical bond in a molecule, look at the atoms that make up the compound. If there are two nonmetals, it is a covalent bond. If the two atoms are metals, it is a metallic bond. If one atom is a metal and the other is a nonmetal, it is an ionic bond. Ionic compounds are also known as salts. You can identify KBr as an ionic compound because potassium is a metal and a salt.
Hope this helps