Answer:
Heldi is right
Explanation:
It will not move even if more people or one person gets off it will stay the same til a force pushes down on it.
The center of gravity and center of mass ARE the same point.
Answer: Impulse = 4 kgm/s
Explanation:
From the question, you're given the following parameters:
Momentum P1 = 12 kgm/s
Momentum P2 = 16 kgm/s
Time t = 0.2 s
According to second law of motion,
Force F = change in momentum ÷ time
That is
F = (P2 - P1)/t
Cross multiply
Ft = P2 - P1
Where Ft = impulse
Substitute P1 and P2 into the formula
Impulse = 16 - 12 = 4 kgm/s
The magnitude of the impulse is therefore 4 kgm/s.
Ball A will have three times the speed as ball B
When inflating the balloon to a diameter of 7 inches, the final volume is
V₁ = (4/3)π*(7/2 in)³ = 57.1667π in³
When inflating the balloon to a diameter of 28 in, the final volume is
V₂ = (4/3)π*(28/2 in)³ = 3658.7π in³
If the rate of air entry into the balloon is constant, then
V₂/V₁ = 3658.7/57.1667 = 64
Answer: it takes 64 times longer.