Acceleration = (change in speed) divided by (time for the change)
Change in speed = (50 km/h)-(30 km/h)
Change in speed = 20 km/h
Acceleration = (20 km/h) / (4 h)
Acceleration = 5 km per hour-squared
An object's mass refers to the amount of matter that is contained by the object.
Answer:
65.14°
Explanation:
The formula for the calculation of critical angle is:
Where,
is the critical angle
is the refractive index of the refractive medium.
is the refractive index of the incident medium.
The light ray is travelling from glass to ethanol
Refractive medium is ethanol with refractive index = 1.361
Incident medium is glass with refractive index = 1.500
So,
Applying in the formula as:
The critical angle is = sin⁻¹ 0.9073 = 65.14°
Answer:
Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids.
Explanation: