Answer:
42 km/h was the average speed of the car for its three-hour trip.
Explanation:
Diameter of the car wheel = d = 0.4 m
Radius of the car wheel = r = 0.5 d = 0.5 × 0.4 m =0.2 m
Distance covered in 1 complete revolution =
Distance covered in 100,000 complete revolution,D =
1 m = 0.001 km
125,663.71 m = 125,663.71 × 0.001 km = 125.66371 km
Time taken to complete 100,000 revolution by a wheel = t = 3 hours
Speed of car : S
42 km/h was the average speed of the car for its three-hour trip.
Answer:
9.73 x 10⁻¹⁰ m
Explanation:
According to Heisenberg uncertainty principle
Uncertainty in position x uncertainty in momentum ≥ h / 4π
Δ X x Δp ≥ h / 4π
Δp = mΔV
ΔV = Uncertainty in velocity
= 2 x 10⁻⁶ x 3 / 100
= 6 x 10⁻⁸
mass m = 0.9 x 10⁻¹⁵ x 10⁻³ kg
m = 9 x 10⁻¹⁹
Δp = mΔV
= 9 x 10⁻¹⁹ x 6 x 10⁻⁸
= 54 x 10⁻²⁷
Δ X x Δp ≥ h / 4π
Δ X x 54 x 10⁻²⁷ ≥ h / 4π
Δ X = h / 4π x 1 / 54 x 10⁻²⁷
=
= 9.73 x 10⁻¹⁰ m