Answer:
25.9 m/s
Explanation:
mass of ball, m = 0.145 kg
initial velocity, u = + 32 m/s
It bounce back with the velocity but in opposite direction so final velocity,
v = - v
Impulse, I = - 8.4 Ns
Impulse is defined as the change in momentum
I = m v - mu = m (v - u)
- 8.4 = 0.145 x (- v - 3 2)
- 57.9 = - v - 32
v = 57.9 - 32 = 25.9 m/s
Thus, the final speed of the ball is 25.9 m/s
Answer:
10.85 m/s
Explanation:
m = 1200 kg, h1 = 19 m, h2 = 13 m
Let v be the velocity
Use the conservation of energy
Potential energy at 19 m = Potential energy at 13 m + kinetic energy
m x g x h1 = m x g x h2 + 1/2 mv^2
m x g (h1 - h2) = 0.5 x m v^2
g (h1 - h2) = 0.5 v^2
9.8 (19 - 13) = 0.5 x v^2
v = 10.85 m/s
Answer:
I would measure the distance between points A and B
If you're calculating the power of an athlete who is lifting weights,
or the power of a windmill that is pumping water from a well, or
the power of two horses turning millstones, then those electrical
units won't help at all.
But if you happen to be calculating the power delivered to an
electrical circuit or dissipated by an electrical device, then you
can use ...
(voltage) times (current)
or
(voltage)² divided by (resistance)
or
(current)² times (resistance) .
The choice just depends on which quantities you know
or can easily measure.
<span>Since youc oncetrate all your force directly towards the moment arm it means that you push it at an angle of your force is directed to the left or the right and I bet that it must be 90</span> degrees to the bar. Obviuosly, if you are about to push it you will do it straight up but not in a zig zag way. In other words, it should be perpendicular to the arm because the<span> torque can be produced only if force is applied at a constant index (90).
Hope that helps! Regards.</span>