Answer:All balls have same velocity
Explanation:
Ball A
horizontal velocity
vertical velocity
let h be the height of building
Vertical velocity acquired by Ball A
Velocity just before hitting ground=
Ball B
launched with velocity u at angle of 45 above horizontal
horizontal velocity will remain same as there is no acceleration in that direction
vertical velocity just before hitting the floor
Final velocity before hitting ground
Ball C
horizontal velocity will remain same as there is no acceleration in that direction
vertical velocity just before hitting the floor
Final velocity before hitting ground
Thus all three balls will have same final velocity.
Answer:
<h2>1 m²</h2>
Explanation:
The area of the floor covered by his both feet can be found by using the formula
f is the force
p is the pressure
From the question we have
We have the final answer as
<h3>1 m²</h3>
Hope this helps you
Answer:
0.0972644
Explanation:
Wave length = wave speed / frequency
Wave length = 96 / 987
= 0.0972644
Answer:
v = (5.2 ± 0.2) 10⁻² m / s
Explanation:
This is an exercise in kinematics of uniform motion. The formula for the average speed is
v = x / t
let's calculate
v = 5.2 / 100
v = 0.052 m / s
v = 5.2 10-2 m / s
we have to find the uncertainty of this quantity we propagate the error using derivatives
Δv = dv /dx Δx + dv /dt Δt
taking everything in the most unfavorable case, I mean all positive
let's make the derivatives
dv / dx = 1 / t
dv / dt = -x / t²
we substitute
Δv = 1 /t Δx + x /t² Δt
let's calculate the error
Δv = 1/100 0.1 + 5.2 / 100² 1
Δv = 1 10⁻³ + 5.2 10⁻⁴
Δv = 1.52 10⁻³ m/s
the error must be given with a significant figure
Dv = 2 10⁻³ m / s
the answer is
v = (5.2 ± 0.2) 10⁻² m / s