Which of the following is a physical change? burning a piece of wood rust forming on an iron fence sawing a piece of wood in hal f a copper roof changing color from orange to green
1 answer:
Sawing the piece of wood in half is a physical change, because no new substances are formed that weren't there before the sawing. Burning wood produces carbon monoxide and carbon dioxide that weren't there before the burning. That's a chemical change. Rust forming on iron is iron oxide that wasn't there before the rusting. That's a chemical change. The green that appears on copper is copper oxide that wasn't there before the green appeared. That's a chemical change.
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Net Force = (mass) x (acceleration) (Newton #2)
Net Force = (50 kg) x (6 m/s² down)
Net Force = (50 * 6) (kg-m/s² down)
<em>Net Force = 300 Newtons down </em>
The first law of Newton’s law state an object in motion will stay in motion and an object at rest will stay at rest unless acted upon with an outside force. Other know as the law of inertia so yes it does
X + y = 5 x = 5 - y 2x - y = 7 2(5-y) - y = 7 10 - 2y - y = 7 10 - 3y = 7 10 - 7 = 3y 3 = 3y y = 1 x + y = 5 x + 1 = 5 x = 5 - 1 x = 4
Answer:
3N
Explanation:
Workdone = F x d
F = force
d = distance 8m
Workdone = 24J
24 = F x 8
Divide both sides by 8
24/8 = F x 8/8
3 = F
F = 3N