C, N and O all belong to the same period, in which it's 2nd Period.
I believe a broom is an example of a lever, so no, not a wedge.
Answer:
27 cm
Explanation:
ASSUMING the elevator is in a constant velocity state (could be zero)
mg = kx
x = mg/k = 15(9.8)/550 = 0.267272... m ≈ 27 cm
Answer:
-7500 N
Explanation:
v₀ = 108 km/h = 30 m/s
v = 0 m/s
t = 4 s
a = Δv / Δt
a = (0 m/s − 30 m/s) / 4 s
a = -7.5 m/s²
F = ma
F = (1000 kg) (-7.5 m/s²)
F = -7500 N