Answer to the fourth one is :
7.7mph
explanation: the total distance covered by the runner(26.2mile) divide by the total time required to finish the race
answer to the 5th one:
49.6mi/h (approximately 50mi/h)
explanation: total distance divide by total time
Good Morning!
It refracts.
The change in the speed of light is called Refraction. This process occurs when light comes in contact with objects of different compositions and structures. Polarization occurs when light only propagates in a particular plane, as opposed to propagating in all.
The force of gravity gets stronger.
Answer:
11 m/s
Explanation:
Draw a free body diagram. There are two forces acting on the car:
Weigh force mg pulling down
Normal force N pushing perpendicular to the incline
Sum the forces in the +y direction:
∑F = ma
N cos θ − mg = 0
N = mg / cos θ
Sum the forces in the radial (+x) direction:
∑F = ma
N sin θ = m v² / r
Substitute and solve for v:
(mg / cos θ) sin θ = m v² / r
g tan θ = v² / r
v = √(gr tan θ)
Plug in values:
v = √(9.8 m/s² × 48 m × tan 15°)
v = 11.2 m/s
Rounded to 2 significant figures, the maximum speed is 11 m/s.