Answer:
The correct option is;
d) F, because the net force is equal to the mutual contact force between the blocks
Explanation:
The given information are
The mass of block A = m
The velocity of block A = +v
The mass of block B = 2·m
The velocity of block B = -v
Given that the two blocks collide, we have;
Initial total momentum = m × v + 2·m×(-v) = m·(v - 2·v) = -m·v
Final total momentum = m × v₁ + 2·m×v₂ = m·(v₁ + 2·v₂)
From the law of conservation of linear momentum, we have;
m·(v₁ + 2·v₂) = -m·v
v₁ + 2·v₂ = -v
Therefore, the resultant velocity of the two blocks is -v, and the direction of the block A is reversed and the resultant inertia is equivalent to the inertia of block A
Therefore;
The force exerted on block B = The force exerted on block A = The rate of change of momentum experienced by the two blocks = The mutual contact force experienced between the blocks.
Answer:
d. to allow the force of expanding gases from the gunpowder to act for a longer time
Explanation:
Answer:
371.2 mm
Explanation:
The Balmer series of spectral lines is obtained from the formula
1/λ = R(1/2² -1/n²) where λ = wavelength, R = Rydberg's constant = 1.097 × 10⁷ m⁻¹
when n = 15
1/λ = 1.097 × 10⁷ m⁻¹(1/2² -1/15²)
= 1.097 × 10⁷ m⁻¹(1/4 -1/225)
= 1.097 × 10⁷ m⁻¹(0.25 - 0.0044)
= 1.097 × 10⁷ m⁻¹ 0.245556
= 2.693 10⁶ m⁻¹
So,
λ = 1/2.693 10⁶ m⁻¹
= 0.3712 10⁻⁶ m
= 371.2 mm
