Answer:
a)5m b)5secs c) 10secs
Explanation:
a) maximum height H = u²/2g
Given u = 50m/s
g = 10m/s²
H = 10²/20
H= 5m
maximum height reached by the rocket is therefore 5m
.b)Time it takes the rocket to reach its maximum height is Tmax = U/g
Tmax = 50/10
Tmax = 5seconds
c) How long the rocket spent in the air is the time of flight T
T = 2U/g
T = 2×50/10
T = 100/10
T = 10seconds
Answer:
The initial arrow's velocity is 40,9 m/s at 11.9° from the horizontal
Explanation:
<em>In order to find the inital velocity we need to determine its components and the angle that the arrow is launched at.</em>
<em>For horizontal component, we will have:</em>
<em>ν cos(θ)t = x ⇒ cos(θ) = x/νt</em>
<em>For vertical component we will have:</em>
<em>h= v sin(θ)t ₋ gt²÷ 2 ⇒ sin (θ) = h + gt²÷2/νt</em>
<em>From the two equations we got, after noting that the vertical displacement is 3m, we can calculate </em>
<em>tan(θ) = h +gt²÷2/νt/ x÷νt = h+ gt²÷2/x = 3+ 9.8.0.5²÷2/20 = 0.21125</em>
<em>Now we can calculate θ = tan⁻¹(0.21125) ≈ 11.9°</em>
<em>Now that we know the angle we can subtitute at any of the expressions for the two components of the velocity . Let's do this subsitution at the horizontal component:</em>
<em>ν cos(θ)t= x =ν = x/tcos(θ)= 20/ 0.5cos(11.9) ≈ 40.9 m/s.</em>
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Answer:
The hammer and the wall exert forces on each other that are equal in magnitude but in opposite directions.
Explanation:
currently doing corrections on the test!
:)
Answer:
Explanation:
r = Radius = 2.7 cm
F = Force = 
A = Area = 
= Stress = 
E = Young's modulus = 
= Strain
= Original length = 67 cm
= Change in length
Young's modulus is given by
Strain is
Strain is given by
The cylinder height decreases by
Answer: D
Experiment 1 has a confounding variable related to the mass of the rockets. Any variation in mass may cause a discrepancy in the distance traveled.
This is the answer to the question because:
- Both experiments do have a confounding variable.
- Experiment 1 doesn't have to stay constant.
- A double-blind experiment will not do anything to the placebo.
- High blood pressure people will not make the results confusing.
The answer has to be the option D. Hope this helps you!
