Answer:

Explanation:
given,
speed of wave, c₁ = 7.7 m/s
angle of incidence, i = 44°
angle of refraction, r = 33°
speed of wave in second medium.
using Snell's law
n₁ sin i = n₂ sin r



now,
calculation of velocity in the medium
n₁ c₁ = n₂ c₂




Speed of wave in the second medium is equal to 6.04 Km/h
Unit is m^3 or metres cubed. You need to multiply the three dimensions of the block to get the volume.
A ruler can be used to measure the edges.
Sin(90 + θ)
By addition angle formula for sine.
sin90cosθ + cos90sinθ
1*cosθ + 0*sinθ
cosθ + 0
= cosθ
sin(90 + θ) = cosθ
Answer:

Explanation:
Given


Required
Determine the mass of the ball
This question will be answered using Newton's second law of motion.
Which states that

Substitute values for Force and Acceleration

Make Mass the subject


--- (approximated)