Answer:
force of friction
Explanation:
the force of friction in an inclined place is less than that in lever, also a lever works on the principle that it reduces the amount of force required to to work while an inclined plane works by decreasing the amount of force required to do the work.
Explanation:
- Velocity of ball (v) = 8 m/s
- Kinetic Energy (K.E) = 139 J
- Mass (m) = ?
We know that,
<h3>• K.E = ½mv²</h3>
→ 139 = ½ × m × (8)²
→ 139 = ½ × m × 64
→ 139 = 1 × m × 32
→ 139 ÷ 32 = m
→ <u>4</u><u>.</u><u>3</u><u>4</u><u> </u><u>kg</u><u> </u><u>=</u><u> </u><u>m</u>
Therefore, mass in kg is 4.34 kg.
Answer:
406 nm
Explanation:
We are given;
Wavelength; λ = 775 nm
Refractive index of Calcium fluoride with wavelength of 775 nm as seen in the graph attached is approximately 1.4308.
n = 1.4308
Formula for the thickness of the film that would destruct the light is;
t = (m + 0.5)(λ/2n)
Where m is the order of the thickness.
The first smallest thickness is at m = 0 while the second smallest thickness is at m = 1.
Thus;
t = (1 + 0.5)(775/(2 × 1.4308))
t ≈ 406 nm