Humans population had dropped by half since the 1960s from 2.2% in 1962 to 1.15% today
Answer:
Kinetic energy is the energy possessed by a body due to its motion. Potential energy is the energy possessed by a body due to its position.
By wave particle duality.
Wavelength , λ = h / mv
where h = Planck's constant = 6.63 * 10⁻³⁴ Js, m = mass in kg, v = velocity in m/s.
m = 1kg, v = 4.5 m/s
λ = h / mv
λ = (6.63 * 10⁻³⁴) /(1*4.5)
λ ≈ 1.473 * 10⁻³⁴ m
Option D.
Efficiency = 45J/120J = 0.375
Or
0.375 * 100% = 37.5 %
Density + mass / volume = 42 / 22 = 1.909 kg / m^3 ( to the nearest thousandth)