Answer:C) THE SUN
Explanation:SUN IS THE PRIMARY SOURCE OF ENERGY IN OUR SOLAR SYSTEM
Answer:
1. t_reaction = 1.08 s
2. v₀₁ = 16.365 m/s
Explanation:
1. This is a kinematics exercise, let's analyze the situation a bit, we can calculate the braking distance and the rest of the distance we can use to calculate the reaction time.
Braking distance
v² = v₀² + 2 a x
when he finishes braking the speed is v = 0
0 = v₀² + 2 a x
x = -v₀² / 2a
x = - 17²/2 (-7)
x = 20.64 m
the distance for the reaction is
d = x_reaction + x
x_reaction = d - x
x_reaction = 39 - 20.64
x_reaction = 18.36 m
as long as it has not reacted the vehicle speed is constant
v = x_reaction / t_reaction
t_reaction = x_reaction / v
t_reaction = 18.36 / 17
t_reaction = 1.08 s
2. Let's find the distance traveled in the reaction time of t1 = 1.21983 s
as the speed is constant
v = x / t
x₁ = v t₁
the distance traveled during braking is
v² = v₀² + 2a x₂
0 = v₀² + 2 a x₂
x₂ = -v₀² / 2a
v = v₀
the total distance is
x_total = x₁ + x₂
x_total = v₀ t₁ + v₀² / 2a
39 = v₀ 1.21983 + v₀²/14
v₀² + 17.08 vo - 546 =0
we solve the second degree equation
v₀ = [ -17.08 ±√(17.08² + 4 546) ]/2
v₀ = [-17.08 ± 49.81 ]/2
v₀₁ = 16.365 m/s
v₀₂ = - 33.445 m/s
as the acceleration is negative the correct result is v₀₁ = 16.365 m/s
Answer:no
Explanation:
Answer:
Vf = 34.3 m/s
1st equation of motion was used to solve.
Explanation:
In order to find the final speed of the cow, when it hits the bushes, we can use first equation of motion:
Vf = Vi + gt
where,
Vf = Final Velocity of Cow = ?
Vi = Initial Velocity of Cow = 0 m/s
g = acceleration due to gravity = 9.8 m/s²
t = time taken = 3.5 s
Therefore,
Vf = 0 m/s + (9.8 m/s²)(3.5 s)
Vf = 34.3 m/s
1st equation of motion was used to solve.
The pitch of a sound is decreased, when a sound source approaches the observer.
Explanation:
Pitch is nothing but it is a property that helps to determine whether the sound is high or low. Doppler effect helps to understand this concept easily. The pitch of the sound is mainly calculated based on the frequency of the sound wave arose from the sound source.
As the wellspring of sound waves moves toward an audience, the sound waves draw nearer together, expanding their recurrence and the pitch of the sound.