Answer:
The detailed explanations is attached below
Explanation:
What is applied is the De brogile equation and the equation showing a relationship between Energy, speed of light and wavelength.
The explanation is as attached below.
I think it should be option (b)
Answer:
2.7 m/s
Explanation:
Draw a free body diagram of the ball. There are two forces:
Weight force mg pulling down
Tension force T pulling 39° above the horizontal
Sum of the forces in the y direction:
∑F = ma
T sin θ − mg = 0
T = mg / sin θ
Sum of the forces in the radial (+x) direction:
∑F = ma
T cos θ = m v² / r
Substitute:
(mg / sin θ) cos θ = m v² / r
mg / tan θ = m v² / r
g / tan θ = v² / r
v = √(gr / tan θ)
Given that r = 0.6 m and θ = 39°:
v = √(9.8 m/s² × 0.6 m / tan 39°)
v ≈ 2.7 m/s
Ah for this problem you are thinking quite a bit hard on. The problem is actually simpler than it looks. The problem states that a bike travels at a constant speed of 3.1 m/s for 6 s and asks how far will it go?. To figure this out you simply need to take 3.1 times 6 s because every second the bike travels 3.1 m. So the answer to this problem would be 18.6 m